14M3 Motor Grader Electrical System Troubleshooting Caterpillar


Event Codes

Usage:

14M-3 E9S
Event codes alert the operator or the technician that an abnormal operating condition exists in one of the machine systems.

When the affected ECM activates an event code, the operator or the technician will be alerted by the Monitoring System Display. Most active events will be logged by the ECM. Some events are active only. Active only events are not logged. The events that are active and the events that are logged can be viewed with the following equipment:

  • Monitoring System Display

  • Caterpillar Electronic Technician (Cat® ET) Service Tool

Warning Levels

The ECM will assign a warning level to an active event code. Event codes are one of three levels. The level is according to the severity of the abnormal condition. Each warning level requires a specific response from the operator. The warning levels and the required operator response are listed below.

Level 1

Warning level 1 alerts the operator that a machine system requires attention. The operator should check that the involved system condition or the operator should perform maintenance on the involved system at the earliest possible time.

Level 2

Warning level 2 requires changing the operation of the machine or performing a maintenance procedure. System components may be damaged if the cause of this warning is ignored.

Level 2S

Warning Level 2S requires an immediate change in machine operation to avoid possible damage to the system.

Level 3

Warning level 3 requires an immediate safe shutdown of the machine. An immediate shutdown is required to avoid damage to the machine or injury to personnel around the machine. The problem that caused the event must be corrected before machine operation can resume.

Indications and System Response

Monitoring System Display

The Monitoring System Display will alert the operator when an event code is active. Event codes are activated in one of three warning levels according to the severity of the condition.



Illustration 1g03589769
(1) Action Light Indicator
(2) Hydraulic Oil Temperature Gauge
(3) Coolant Temperature Gauge
(4) Left Turn Signal Indicator
(5) Analog Tachometer
(6) Right Turn Signal Indicator
(7) Fuel Level Gauge
(8) Diesel Exhaust Fluid (DEF) Level Gauge
(9) Articulation Angle Gauge
(10) Parking Brake Indicator
(11) Emission Malfunction Indicator
(12) Secondary Steering System Indicator
(13) DPF
(14) Regeneration Active
(15) Brake System Indicator
(16) Right Blade Float Indicator
(17) Engine System Indicator
(18) Centershift Lock Indicator
(19) Implement Lockout
(20) Differential Lock Indicator
(21) Left Blade Float Indicator
(22) Battery Charge Indicator
(23) Throttle Lock
(24) High Beam Indicator
(25) Operator Not Present Indicator

The following options are available through the "Service" menu:

  • Display

  • Cross Slope

  • Transmission

  • Engine

  • Implement

Follow the steps in the Service Menu to get to the Diagnostic Display:

  • Press Service Menu

  • On the Service Menu, press Diagnostics

For more detailed information, Refer to the Monitor System, Systems Operation, Troubleshooting, Testing and Adjusting Manual.

The warning indicators for the subsystem on the Instrument Cluster will illuminate when an EID is activated for a particular subsystem. When level 1 events are active, the warning indicator for the subsystem will be the only type of indicator that will illuminate.

The action Indicator will flash red when a level 2 warning or level 3 warning is active. If communication between Monitoring System Display and the Instrument Cluster fails, the action lamp will flash yellow.

The action alarm is driven as an output directly from the Instrument Cluster. If a level 3 warning is active, the action alarm will sound a tone that is pulsing. The action alarm will sound these tones to alert the machine operator that immediate action is required.

If two warnings of a different level are active at the same time, the highest level warning will be displayed.

The response of the Monitoring System Display to these warning levels is shown in the following table.

Table 1
WARNING OPERATION 
Warning Level  Warning Indications  Action That Is Required By The Operator  Possible Result (1) 
Warning Indicators Action Indicator  Sounds Of The Action Alarm 
ON  OFF  OFF  No immediate action is required. The system needs attention soon.  No harmful effects or damaging effects 
ON  Flash ON and OFF.  OFF  Change machine operation or perform maintenance to the system.  Damage to system components 
2s  ON  Flash ON and OFF.  ON  Immediately change the operation of the machine.  Severe damage to system components. 
ON  Flash ON and OFF  Pulse ON and OFF  Immediately perform a safe engine shutdown.  Injury to operator or severe damage to components 
(1) Possible result if no action is taken by the operator.

Caterpillar Electronic Technician (Cat® ET) Service Tool

When an abnormal operating condition of the "powertrain" occurs, the status screen on Cat® ET indicates that there is an active event.

Event codes are displayed on the Cat ET service tool in the following format:

EXXXX Description of the code

The "E" means that the code is an event code. The "XXXX" is a numeric identifier. The numeric identifier is followed by a description of the code.

Active event codes are listed in ascending numerical order. The code with the lowest number is listed first. Once a logged code is inactive, the code will be displayed with the letters “IN” for inactive. An event code that is not recorded will be removed when the event code is no longer active.

Logged Event Codes

Some event codes are logged in the ECM memory. Some event codes are active only. The logged event codes are listed in numerical order.

A logged code is cleared from memory when one of the following conditions occur:

  • The service technician manually clears the code.

  • The code does not reoccur for 1000 hours.

  • A new code is logged and there are already 20 logged codes in memory. In this case, the oldest logged code is cleared.

Note: Always clear logged event codes after investigating and correcting the problem which generated the code.

Troubleshooting

Perform the following steps to troubleshoot an event code:

  1. Obtain the following information from the operator:

    • The event and the time of the event

    • Determine the operating conditions of the engine at the time of the event. Conditions such as engine rpm and load may be important.

    • Determine if there are any systems that were installed by the dealer or by the customer that could cause the event.

  2. Verify that the event is not due to normal machine operation. Verify that the event is not due to error of the operator.

  3. Check all fluid levels and all oil levels.

  4. Troubleshoot and repair any active diagnostic codes.

List of Event Codes For the Transmission/Chassis ECM

The following table lists the event codes that apply to the control system of the "powertrain". The recommended response is listed. Use Cat® ET to determine active or logged event codes.

Transmission/Chassis ECM

Table 2
Event Codes For the Transmission/Chassis ECM (MID 27) 
Code (Level)  Description  Possible Cause and Recommended Response 
E155 (2)  High Torque Converter Oil Temperature  Activated when torque converter oil temperature exceeds 120° C (248° F) for 15 seconds.
Check torque converter oil level.
Modify machine operation to reduce system load. 
E192 (3)  Steering System Malfunction  Immediate safe shutdown required.

Activates when ECM does not receive expected information from other ECMs and/or sensor signals.

The following active CID diagnostic codes will cause E192 to activate:
41 (8V Sensor DC Power Supply)
420 (Secondary Steering Relay)
585 (Transmission Output Speed Sensor #1)
590-9 (Engine Control Abnormal Update Rate)
673 (Transmission Output Speed Sensor #2)
674 (Transmission Intermediate Speed Sensor #1)r
675 (Transmission Intermediate Speed Sensor #2)
1471 (Steering Control Position Sensor #1)
1472 (Steering Control Position Sensor #2)
1473 (Steering Control Position Sensor #3)
1482 (10V Sensor Supply)
1674 (Solenoid Return #1)
2175 (Secondary Steering System Steer Left Solenoid)
2176 (Secondary Steering System Steer Right Solenoid)
2199 (Secondary Steering Request Signal Line)
2200 (Left Steering Cylinder Position Sensor)
2201 (Right Steering Cylinder Position Sensor)

* Note: CID 585 and CID 673 must BOTH be present to set an E192.

** Note: CID 674 and CID 675 must BOTH be present to set an E192.

Investigate and resolve the cause of the listed active diagnostic code. Then, reset the active event with a key start switch cycle. 
E256 (3)  Steering Output Detected in Wrong Direction  Immediate safe shutdown is required.
Usually occurs after servicing.
Possible causes are the following:
- Hydraulic hose connections are reversed.
- Electrical connections of the secondary solenoid are reversed.
- Hydraulic steering valve is malfunctioning.
Refer to Troubleshooting, “Steering Direction is Opposite of Expected Direction” for additional troubleshooting. 
E257 (3)  Steering Output Detected with No Command Given  Immediate safe shutdown is required.

Front wheels are moving without a command.

Possible causes are the following:
· Operating the machine in rough terrain is forcing unexpected movement of the front wheels.

· Problem with the hydraulic control valve

· An electrical problem with the steering valve control solenoids.

Refer to Troubleshooting, "Steering Movement Without Request" for additional troubleshooting. 
E258 (3)  No Steering Detected with Command Given  Immediate safe shutdown is required.

Possible causes are the following:
· Front wheels are physically blocked and the front wheels do not respond to a command.

· Mechanical steering linkage is physically blocked.

· Mechanical problem in the steering control valve

Refer to Troubleshooting, "Steering Does Not Function" for additional troubleshooting. 
E284 (2s)  Low Brake Accumulator Pressure  This code will be active at startup when the brake pressure is low (below 10800 kPa (1566.43 psi)) and either the parking brake is disengaged or the shift lever is not in the NEUTRAL position.
To deactivate the event, engage the park brake or shift the transmission into NEUTRAL. The event will also go inactive once the brake pressure is above 10800 kPa (1566.43 psi) 
E284 (3)  Low Brake Accumulator Pressure  Immediate safe shutdown is required.
The event will not be active and logged if the Brake Accumulators do not reach 10800 kPa (1566.43 psi) within 60 seconds of the engine running.

The event will be active and logged if the pressure of the Brake Accumulator drops below 9780 kPa (1418.49 psi).

If the machine is logging this event, perform the following steps:
1. Wait for the temperature of the hydraulic oil to cool to 80° C (176° F) or less.

2. Verify that the service brake accumulator pressure sensor is reading accurately. Compare the reading from the pressure sensor. Use Cat® ET to monitor the sensor and compare the reading from a hydraulic pressure sensor gage that should be connected to the same hydraulic circuit and as close to the gage as possible.

3. If the pressure sensor is reading accurately, do not replace the pressure sensor. Troubleshoot the hydraulic system. Specifically, look for leaks in the system.

4. Verify that the brake accumulators are capable of holding a charge of 4100 kPa (594.66psi) 
E329 (2)  Transmission Filter Plugged  This code is active and recorded when the temperature of the transmission oil is above 50° C (122° F) and the bypass switch for the Transmission Oil Filter is set to the bypass mode.
The code is deactivated by cycling power to the machine by turning OFF and ON key start switch and/or the disconnect switch.
If the code is still present, then replace the transmission oil filter. 
E334 (2)  Low Auto Lube Pressure  Activated during the autolube cycle (configured Autolube duration) when the pressure does not reach the minimum configured Autolube pressure target. Stays active until pressure is reached during a cycle. This event is logged.
In Cat® ET, check the following configured parameters:
- Cycle Duration. The default is 240 seconds. Low time setting may not allow time for pressure to be reached.
- Minimum Pressure. Default is 18615.9 kPa (2700 psi)
- High setting may not allow pressure to be reached in the configured duration time.


Check for leaks, kinked or plugged lines, fuse or pump. 
E452 (2S)  Excessive Inching Mode Operation  Note: Speed match gear selection will not operate when inching pedal is depressed. 
E453 (2)  Desired Gear Prohibited for Machine Speed   
E490 (1)  Park Brake Applied While Shift Lever Not In Neutral  Disengage the parking brake before shifting out of neutral. 
E490 (2S)  Park Brake Applied While Shift Lever Not In Neutral   
E562 (1)  Steering Lever Has Not Been Aligned to Wheel Steering Angle(1)  Left Joystick is being swept too fast. Sweep slower.
Attempt to lean the wheels using the wheel lean function then sweep the steering joystick again.

Left joystick must be "swept" fully left and right to align the front wheel angle with the correct joystick position for that angle. 
E562 (2S)  Steering Lever Has Not Been Aligned to Wheel Steering Angle  Machine was put in gear before the steering was aligned. Align steering prior to shifting into gear.

The Steering will auto align. 
E627 (3)  Parking Brake Applied with Machine in Motion  Modify Behavior

Caused by driving the machine with the parking brake ON.
E627 will occur if the machine is traveling at a speed that is greater than 16.0 km/h (10.0 mph) and the parking brake switch is toggled to the ON position.

Disengage the parking brake before shifting out of neutral.

Note - If this code is logged, a follow-up of the parking brake system integrity should be performed. 
E644 (3)  Low Transmission Oil Pressure  Immediate safe shutdown is required.

Activated when the transmission oil pressure is below 1000 kPa (145 psi) and the engine speed is above 780 rpm for ten seconds.
Check the transmission and associated lines for problems such as leakage.
Check transmission main relief valve pressure, see Testing and Adjusting, "Power Train Charge System Pressure - Test and Adjust". 
E716 (1)  Conflicting Brake Pressure  This event is active and recorded when the readings from the two Brake Charge Pressure Sensors are different by more than 1000 kPa (145 psi).

To determine the cause of the event code, perform the following steps:
1. Allow the temperature of the hydraulic oil to cool to less than 80° C (176° F).

2. Verify that the pressure sensor for the Service Brake Accumulator is reading accurately. Compare the pressure reading from Cat® ET to a gage that is connected to the same hydraulic circuit, near the pressure sensor.

2a. If one of the pressure sensors is offset by more than 900 kPa (131 psi), replace the faulty pressure sensor.

2b. If the pressure sensor is reading accurately, do not replace the pressure sensor. Troubleshoot the hydraulic system by looking for leaks in the system. 
E728 (2)  Parking Brake Retract Motor Activated   
E735 (2)  Transmission Gear Limited Due to Cold Transmission Oil  Active when cold transmission oil mode is active.
Refer to Systems Operation, "Features" of this media under the subheading "Cold Transmission Oil Mode". 
E737 (3)  Inching Control Disabled Due to System Fault  Immediate safe shutdown is required.

Active when both CID 573 "Inching Pedal Position Sensor" and CID 1484 "Inching Pedal Switch" are faulted.

Investigate and resolve the cause of the active diagnostic codes.
Note: Speed match gear selection will not operate when inching pedal is depressed. 
E791 (1)  Excessive Air Conditioning Refrigerant Monitoring Circuit Open Time  Associated with a refrigerant pressure leak.

If the system pressure decreases abnormally between the compressor and the expansion valve, a refrigerant leak is evident. When a refrigerant leak exists, compressor oil is also lost. The pressure switch cuts off voltage to the compressor to protect the circuit. The pressure switch helps prevent a seizure of the compressor due to a lack of compressor oil. 
E794 (3)  Steering Systems Not Synchronized  Immediate safe shutdown is required.

One ECM (Implement 2 or Transmission/Chassis) has lost steer alignment between joystick and steer cylinders and the other ECM is still aligned.

Can be caused by rapid key ON/OFF/ON cycle.
Shut down machine, restart, and align steering (see event code E562 above).

Check for data link communication, CID diagnostic codes:
247 (SAE J1939 Data Link)
296 (Transmission Control)
590 (Engine Control Module)
1558 (Implement 2 Control)
Resolve and clear any active fault. Restart the machine and align steering.

A failure on the Implement ECM 2 or the Transmission/Chassis ECM.
A failure between one steering ECM and the joystick or the cylinder position reading.

Resolve and clear any active fault. Restart machine and align steering errors. 
E795 (3)  Machine Speed Excessive for Machine Articulation Angle(1)  Immediate operator response is required.

The event is active when the articulation angle of the machine is greater than 6.5° and the speed of the machine exceeds the limit for the current articulation angle of the machine. The limit is exceeded when the current gear is 7F, 8F or 6R and the machine is moving faster than: 30.6 km/h (19 mph) for the 12M3 machines, 32 km/h (19.8 mph). for the 160M3

The event is deactivated by decreasing the articulation angle to less than 5.5 degrees or reducing the machine speed until the event code clears. 
E861 (1)  Clock Manual Alignment Required  The ECM internal clock is also known as an electronic service hour meter. The transmission/chassis hour meter is too far out of alignment with other ECM hour meters.

Use Cat® ET to synchronize the ECM hour meters. At the top menu, click on Service, and Synchronize Service Hour Meters from the drop-down menu. Next, click the Synchronize button to synchronize all the service hour meters on the machine. A pop-up dialog box will inform you of a successful synchronization of each ECM. 
E875 (1)  Low System Voltage  Check Charging System 
E875 (2)  Low System Voltage  Check Charging System 
E876 (1)  High System Voltage  Check Charging System 
E876 (3)  High System Voltage  Check Charging System 
E877 (1)  High Transmission Oil Temperature  Activation/Deactivation points are not dependent on the speed of machine.

Activated when transmission oil temperature reaches 109° C (228° F) for greater than 300 seconds. Resets when oil temperature decreases to less than 107° C (224° F).

Modify machine operation to reduce system load. 
E877 (2)  High Transmission Oil Temperature  Activation/De-activation points are not dependent on the speed of the machine.

Activated when transmission oil temperature reaches 115° C (239° F) for 300 seconds or 120° C (248° F) for 15 seconds. Resets when oil temperature decreases to less than 107° C (224° F).

Check transmission oil level.
Modify machine operation to reduce system load. 
877 (3)  High Transmission Oil Temperature  Immediate safe shutdown is required. 
E1256 (3)  Key Input Off While Machine in Operation  Immediate safe shutdown is required.

May occur if the key is turned off while the machine is operating. If this condition occurs while the keyswitch is in the ON position, check the keyswitch circuit for a failure. 
E1287 (2)  High Transmission Hydrostatic Oil Outlet Temperature  Transmission variator outlet oil temperature is higher than the specified limit.
Probable Cause -
The ambient temperature too high for cold-weather oil.
There is an issue with the variator flushing temp sensor/wiring resistance.
Application profile (too much time at high torque/stall).
A variator component issue.


Recommendation -
Change machine operation (too much time at high torque (stall)).
Use the appropriate oil for the ambient conditions. 
E1293 (1)  Transmission Internal Component Overspeed  Triggered if the internal transmission shaft speed exceeds the specified threshold RPM for a certain gear.

Probable Cause: Inching pedal is engaged and machine coasting on grades

Modify machine operation to prevent coasting conditions. 
E1293 (2)  Transmission Internal Component Overspeed  Triggered if the internal transmission shaft speed exceeds the specified threshold RPM for a certain gear by a specified speed greater than what triggered the Level 1 code.

Probable Cause: Inching pedal is engaged and machine coasting on grades

Modify machine operation to prevent coasting conditions. 
E1374 (3)  Steering Valve Spool Not Responding to Command  Immediate Safe Shut Down of Machine is Required.
Probable Cause -
Triggered when the steering spool was detected not to move in the commanded direction. Multiple possible causes include: Steering stuck in NEUTRAL (contamination).
Steering stuck in NEUTRAL (contamination).
Primary steering solenoid issue or failure (stuck closed).
Primary pilot ON/OFF solenoid issue or failure (stuck closed).
Primary pilot supply pressure issue or failure (supply low).
Spool position sensor failure (failed in range). 
E1375 (3)  Unexpected Steering Valve Spool Movement Detected  Triggered when the steering spool was detected to behave in an unexpected manner to the command.
Steering Valve Spool stuck out of neutral (contamination).
Primary or secondary steering solenoid issue or failure (stuck open).
Primary pilot On/Off solenoid issue or failure (stuck open).
Spool position sensor failure (failed in range).
Refer to Steering Does Not Function for more troubleshooting information. 
E1387 (1)  Operator Seat Belt Unfastened While Machine is Idle  Probable Cause -
Activates if all of the following conditions are met for 1 second:
-The machine is stationary (based on ground speed).
-Machine is in neutral.
-Implements are not being operated.
-Calibration status is not active.
Recommended Actions -
Ensure that the operator seat belt is properly fastened. 
E1388 (2)  Operator Seat Belt Unfastened While Machine Is Not Idle  Probable Cause -
Triggered when the seat belt is unfastened while the machine is operating.
Activates if any of the following conditions are met for 0.5 seconds and is logged after 7 seconds:
-Machine is moving (based on ground speed).
-Machine is in gear.
-Implements are being operated.
-Calibration is active.
Recommended Actions -
Ensure that the operator seat belt is properly fastened. 
E1560 (2)  Low Brake Pressure Due to Low Engine Speed  Brake system pressure is low and engine is not running. Same logic as E284 (3), but only occurs when engine is not running. Typically can activate when low brake system pressure occurs after engine stall. 
E1704 (1)  High Transmission Clutch Accumulated Thermal Energy  Launching at too high a gear or braking and shifting at same time. Adjust operating behavior accordingly. 
E1704 (2)  High Transmission Clutch Accumulated Thermal Energy  Launching at too high a gear or braking and shifting at same time. Adjust operating behavior accordingly. 
E1704 (2S)  High Transmission Clutch Accumulated Thermal Energy  Launching at too high a gear or braking and shifting at same time. Adjust operating behavior accordingly. 
E1704 (3)  High Transmission Clutch Accumulated Thermal Energy  Launching at too high a gear or braking and shifting at same time. Adjust operating behavior accordingly. 
(1) Active only code, will not be logged.

Implement ECM

Table 3
Event Codes For the Implement ECM (MID 82) 
Code (Level)  Description  Possible Cause and Recommended Response 
E236 (1)  Return Hydraulic Oil Filter Plugged  Replace the filter. 
E263 (3)  Low Main Pump Pressure  Immediate safe shutdown is required.

- Check the level of the hydraulic oil.
- Check for possible hydraulic pump failure.
- Verify that the hydraulic pressure sensor is accurate. Compare the pressure sensor reading to the reading of a calibrated hydraulic pressure gauge that is hooked to the same hydraulic circuit.
If the pressure sensor is accurate, do not replace the pressure sensor. Troubleshoot the hydraulic system.

Refer to Systems Operation, Troubleshooting, Testing and Adjusting, RENR8459, “Hydraulic and Steering System” and Systems Operation, Troubleshooting, Testing and Adjusting, RENR8469, “Hydraulic and Steering System” and Systems Operation, Troubleshooting, Testing and Adjusting, RENR8484, “Hydraulic and Steering System”. 
E455 (1)  Hydraulic Pilot Supply Filter Plugged  Mechanical problem in the steering control valve.
Mechanical steering linkage is physically blocked.
Loss of load signal.

Immediate safe shutdown is required.

No front wheel movement is detected when commanded. 
E595 (1)  Case Drain Hydraulic Oil Filter Plugged  Caused by Dirty or clogged filter or wrong Hydraulic oil used in extreme low temperature operation. Warm/replace Oil or replace filter as necessary.
Reference Operation and Maintenance Manual, "Oil Filter (Implement Controls) - Replace" and also refer REHS4240. 
E796 (1)  Machine articulation angle limited due to machine speed  When the machine is operating in the high gears, the articulation angle of the machine is restricted.

Operate the machine in lower gears in order to increase the machine articulation angle. 
E861 (1)  Clock Manual Alignment Required  The ECM internal clock is too far out of alignment with the other control module clocks on the machine

Use the Cat ET service tool to align the clock with the other control modules. 
E878 (2)  High Hydraulic Oil Temperature  Activated when the hydraulic oil temperature is 93° C (199.4° F). Deactivated when oil temperature decreases to 90° C (194° F).

Reduce hydraulic load.
Modify the operation of the machine to reduce system load. Check hydraulic oil level. Check the cooling system of the hydraulic oil. 
E878 (3)  High Hydraulic Oil Temperature  Activated when the hydraulic oil temperature is 99° C (210.2° F). Deactivated when oil temperature decreases to 90° C (194.° F).

Immediate safe shutdown is required.
Modify the operation of the machine to reduce system load.
Check hydraulic oil level.
Check the cooling system of the hydraulic oil. 
E1256 (3)  Key Input Off while Machine in Operation  The key switch signal wire to the Implement ECM 2 has an open and the engine is still operating.
Verify integrity of key switch signal wire to ECM.

Immediate safe shutdown is required. 

Implement ECM 2 (Steering)

Table 4
Event Codes For the Implement ECM 2 (Steering) (MID 145) 
Code (Level)  Description  Refer to Troubleshooting, "Steering System Has Active Diagnostic Code" for additional troubleshooting. 
E192 (3)  Steering System Malfunction  Note - The following Event can cause this code to activate:
Loss of ground speed
Loss of engine speed
41 (8V Sensor Supply)
262 (5V Sensor Supply)
296 (Trans/Chassis ECM)
590-9 (Engine ECM Abnormal Update Rate)
1471 (Steering Lever Position Sensor #1)
1472 (Steering Lever Position Sensor #2)
1473 (Steering Lever Position Sensor #3)
1674 (Solenoid Return #1)
2177 (Primary Steering Disable Solenoid)
2200 (Left Steering Cylinder Position Sensor)
2201 (Right Steering Cylinder Position Sensor)
2828 (Main Hydraulic Pump Pressure Sensor #1)
2829 (Main Hydraulic Pump Pressure Sensor #2)
3284 (Primary Steering System Steer Left Solenoid)
3285 (Primary Steering System Steer Right Solenoid) 
E252 (1)  Loss of Key Table Information  An unauthorized key has been inserted into the key slot of the machine. Refer to Machine Security System in the Maintenance Manual. 
E256 (3)  Steering Output Detected in Wrong Direction  Immediate safe shutdown is required.

Usually occurs after servicing.

Possible causes are the following:
- Hydraulic hose connections are reversed.
- Electrical connections of the secondary solenoid are reversed.
- Hydraulic steering valve is malfunctioning.

Refer to Troubleshooting, “Steering Direction is Opposite of Expected Direction” for additional troubleshooting. 
E257 (3)  Steering Output Detected with No Command Given  This event will only activate if the steering spool position sensor is faulted.
Operating the machine in rough terrain is forcing unexpected movement of the front wheels.
Hydraulic steering control valve problem.
There is a problem in the electrical circuit of the steering valve control solenoids.
Hydraulic hose connections are reversed.

Immediate safe shutdown required.
Front wheels moving without command.
Possible causes:
Refer to Troubleshooting, "Steering Movement Without Request" for additional troubleshooting. 
E258 (1)  No steering detected with command given  This event will only activate if the steering spool position sensor is faulted.
Mechanical problem with the steering valve
Electrical problem with the steering valve
Mechanical problem with the front axle linkage
Machine wheels are locked into a position due to external forces/obstruction 
E258 (3)  No steering detected with command given  Immediate safe shutdown required.
Refer to Troubleshooting, "Steering Does Not Function" for additional troubleshooting. 
E263 (3)  Low Main Pump Pressure  This event code is associated with the main hydraulic pump discharge pressure. This event indicates that the main hydraulic pump pressure sensor reading has dropped below 1900 kPa.

Immediate safe shutdown required
Check hydraulic oil fluid level
If hydraulic fluid level is not low, refer to Testing and Adjusting, UENR3480: Motor Graders Hydraulic and Steering System, Hydraulic System Pressure Test and Adjust for further troubleshooting information. 
E560 (3)  Secondary Steering Pump Pressure Not Responding to Command  Secondary steering test results in insufficient pump pressure.
Electrical problem in the secondary steering pump motor circuit.
Mechanical problem with the secondary steering pump.

Immediate safe shutdown required.
Refer to Troubleshooting, "Steering Does Not Function" for additional troubleshooting. 
E562 (1)  Steering Lever Has Not Been Aligned To Wheel Steering Angle  Left Joystick is being swept too fast. Sweep slower.
Attempt to lean the wheels using the wheel lean function then sweep the steering joystick again.

Left joystick must be "swept" fully left and right to align the front wheel angle with the correct joystick position for that angle. 
E562 (2S)  Steering Lever Has Not Been Aligned To Wheel Steering Angle  Machine was put in gear before the steering was aligned. Align steering prior to shifting into gear.

The Steering will auto align. 
E598 (2)  Steering Limited Due to Cold Hydraulic Oil  Machine is ON in cold conditions

Allow the machine to warm up at low idle before operating.
Put the blade in float to warm the hydraulic oil 
E599 (1)  Gear Too High for Steering with Cold Oil  Machine is in gear with cold steering oil

Use caution while driving. Cold steering oil could cause inconsistency in valve response. 
E599 (2)  Gear Too High for Steering with Cold Oil  Machine is being operated in a gear that is not safe due to cold steering oil

Immediately slow the machine down and place in a lower gear.
Allow the machine to warm up at low idle before operating.
Operate the machine in low gear for warm-up. 
E796 (1)  Machine Articulation Angle Limited Due to Machine Speed  When the machine is operating in the high gears, the articulation angle of the machine is restricted.

Operate the machine in lower gears to increase the machine articulation angle. 
E861 (1)  Clock Manual Alignment Required  The ECM internal clock is too far out of alignment with the other control module clocks on the machine.

Use the Cat ET service tool to align the clock manually with the other control modules 
E1256 (3)  Key Input Off While Machine In Operation  The key switch signal wire to the Implement ECM 2 has an open and the engine is still operating
Add Verify Integrity of the wire

Immediate safe shutdown required. 
E1304 (2)  Secondary Steering Pump Automatic Test Bypassed  The secondary steering pump automatic start-up test bypassed

Stop the machine and run the manual steering test 
E1374 (3)  Steering Valve Spool Not Responding to Command  Immediate safe shutdown required.

Triggered when the steering spool was detected not to move in the commanded direction.
Steering Valve Spool stuck in neutral (contamination).
Primary steering solenoid issue or failure (stuck closed)
Primary pilot On/Off solenoid issue or failure (stuck closed).
Primary pilot supply pressure issue or failure (supply low).
Spool position sensor failure (failed in range).
Refer to (Steering Does Not Function) for more troubleshooting information. 
E1375 (3)  Unexpected Steering Valve Spool Movement Detected  Immediate safe shutdown required.

Triggered when the steering spool was detected to behave in an unexpected manner to the command.
Steering Valve Spool stuck out of neutral (contamination).
Primary or secondary steering solenoid issue or failure (stuck open).
Primary pilot On/Off solenoid issue or failure (stuck open).
Spool position sensor failure (failed in range).
Refer to (Steering Does Not Function) for more troubleshooting information. 
E1433 (1)  Steering Lever Has not Been Aligned  Triggered while enabling the auto articulation feature after key cycle, if the articulation and steering angle do not match within a certain tolerance.
A message will be displayed on the user interface. 
E2085 (1)  Invalid Articulation Response Detected  The machine has articulated more than 3.5° with no command.
Mechanical problem in the hydraulic valve. Valve may be stuck.

Possible causes:
If pilot valve is stuck, implement lockout activation will stop the articulation.
If main valve is stuck, implement lockout activation will not stop the articulation.
Sensor drift.
A problem with the hydraulic cylinders. 
E2085 (2)  Invalid Articulation Response Detected   

Caterpillar Information System:

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