Cross-Reference Information for Diagnostic Codes
Table 1 lists the diagnostic codes that apply to the engines that are covered in this manual. Use Caterpillar Electronic Technician (ET) to determine the diagnostic codes that are active or logged. Then refer to the appropriate troubleshooting procedure for more information.
Cross-Reference from CID-FMI Code to the Appropriate Circuit Test | |
CID-FMI Code and Description | Circuit Test |
1-5 Cylinder #1 Injector: Current Below Normal | Troubleshooting, "Injector Solenoid - Test" |
1-6 Cylinder #1 Injector: Current Above Normal | Troubleshooting, "Injector Solenoid - Test" |
2-5 Cylinder #2 Injector: Current Below Normal | Troubleshooting, "Injector Solenoid - Test" |
2-6 Cylinder #2 Injector: Current Above Normal | Troubleshooting, "Injector Solenoid - Test" |
3-5 Cylinder #3 Injector: Current Below Normal | Troubleshooting, "Injector Solenoid - Test" |
3-6 Cylinder #3 Injector: Current Above Normal | Troubleshooting, "Injector Solenoid - Test" |
4-5 Cylinder #4 Injector: Current Below Normal | Troubleshooting, "Injector Solenoid - Test" |
4-6 Cylinder #4 Injector: Current Above Normal | Troubleshooting, "Injector Solenoid - Test" |
5-5 Cylinder #5 Injector: Current Below Normal | Troubleshooting, "Injector Solenoid - Test" |
5-6 Cylinder #5 Injector: Current Above Normal | Troubleshooting, "Injector Solenoid - Test" |
6-5 Cylinder #6 Injector: Current Below Normal | Troubleshooting, "Injector Solenoid - Test" |
6-6 Cylinder #6 Injector: Current Above Normal | Troubleshooting, "Injector Solenoid - Test" |
7-5 Cylinder #7 Injector: Current Below Normal | Troubleshooting, "Injector Solenoid - Test" |
7-6 Cylinder #7 Injector: Current Above Normal | Troubleshooting, "Injector Solenoid - Test" |
8-5 Cylinder #8 Injector: Current Below Normal | Troubleshooting, "Injector Solenoid - Test" |
8-6 Cylinder #8 Injector: Current Above Normal | Troubleshooting, "Injector Solenoid - Test" |
9-5 Cylinder #9 Injector: Current Below Normal | Troubleshooting, "Injector Solenoid - Test" |
9-6 Cylinder #9 Injector: Current Above Normal | Troubleshooting, "Injector Solenoid - Test" |
10-5 Cylinder #10 Injector: Current Below Normal | Troubleshooting, "Injector Solenoid - Test" |
10-6 Cylinder #10 Injector: Current Above Normal | Troubleshooting, "Injector Solenoid - Test" |
11-5 Cylinder #11 Injector: Current Below Normal | Troubleshooting, "Injector Solenoid - Test" |
11-6 Cylinder #11 Injector: Current Above Normal | Troubleshooting, "Injector Solenoid - Test" |
12-5 Cylinder #12 Injector: Current Below Normal | Troubleshooting, "Injector Solenoid - Test" |
12-6 Cylinder #12 Injector: Current Above Normal | Troubleshooting, "Injector Solenoid - Test" |
41-3 8 Volt DC Supply: Voltage Above Normal | Troubleshooting, "Sensor Supply - Test" |
41-4 8 Volt DC Supply: Voltage Below Normal | Troubleshooting, "Sensor Supply - Test" |
91-2 Throttle Position Sensor: Erratic, Intermittent, or Incorrect | Troubleshooting, "Sensor Signal (PWM) - Test" |
91-3 Throttle Position Sensor: Voltage Above Normal | Troubleshooting, "Sensor Signal (PWM) - Test" |
91-4 Throttle Position Sensor: Voltage Below Normal | Troubleshooting, "Sensor Signal (PWM) - Test" |
91-8 Throttle Position Sensor: Abnormal Frequency, Pulse Width, or Period | Troubleshooting, "Sensor Signal (PWM) - Test" |
100-3 Engine Oil Pressure Sensor: Voltage Above Normal | Troubleshooting, "Sensor Signal (Analog, Active) - Test" |
100-4 Engine Oil Pressure Sensor: Voltage Below Normal | Troubleshooting, "Sensor Signal (Analog, Active) - Test" |
100-13 Engine Oil Pressure Sensor: Calibration Required | Troubleshooting, "Pressure Sensor - Calibrate" |
101-3 Crankcase Air Pressure Sensor: Voltage Above Normal | Troubleshooting, "Sensor Signal (Analog, Active) - Test" |
101-4 Crankcase Air Pressure Sensor: Voltage Below Normal | Troubleshooting, "Sensor Signal (Analog, Active) - Test" |
101-13 Crankcase Air Pressure Sensor: Calibration Required | Troubleshooting, "Pressure Sensor - Calibrate" |
110-3 Engine Coolant Temperature Sensor: Voltage Above Normal | Troubleshooting, "Sensor Signal (Analog, Passive) - Test" |
110-4 Engine Coolant Temperature Sensor: Voltage Below Normal | Troubleshooting, "Sensor Signal (Analog, Passive) - Test" |
168-2 Electrical System Voltage: Erratic, Intermittent, or Incorrect | Troubleshooting, "Electrical Power Supply - Test" |
168-3 Electrical System Voltage: Voltage Above Normal | Troubleshooting, "Electrical Power Supply - Test" |
168-4 Electrical System Voltage: Voltage Below Normal | Troubleshooting, "Electrical Power Supply - Test" |
172-3 Intake Manifold Air Temperature Sensor: Voltage Above Normal | Troubleshooting, "Sensor Signal (Analog, Passive) - Test" |
172-4 Intake Manifold Air Temperature Sensor: Voltage Below Normal | Troubleshooting, "Sensor Signal (Analog, Passive) - Test" |
174-3 Fuel Temperature Sensor: Voltage Above Normal | Troubleshooting, "Sensor Signal (Analog, Passive) - Test" |
174-4 Fuel Temperature Sensor: Voltage Below Normal | Troubleshooting, "Sensor Signal (Analog, Passive) - Test" |
190-8 Engine Speed Sensor: Abnormal Frequency, Pulse Width, or Period | Troubleshooting, "Speed/Timing - Test" |
253-2 Personality Module: Erratic, Intermittent, or Incorrect | Troubleshooting, "ECM Software - Install" |
261-11 Engine Timing Offset fault | Troubleshooting, "Timing - Calibrate" |
262-3 5 Volt Sensor DC Power Supply: Voltage Above Normal | Troubleshooting, "Sensor Supply - Test" |
262-4 5 Volt Sensor DC Power Supply: Voltage Below Normal | Troubleshooting, "Sensor Supply - Test" |
267-3 Remote Shutdown Input: Voltage Above Normal | Troubleshooting, "Shutdown (Ground Level) - Test" |
267-4 Remote Shutdown Input: Voltage Below Normal | Troubleshooting, "Shutdown (Ground Level) - Test" |
268-2 Programmed Parameter Fault: Erratic, Intermittent, or Incorrect | Troubleshooting, "Configuration Parameters" |
274-3 Atmospheric Pressure Sensor: Voltage Above Normal | Troubleshooting, "Sensor Signal (Analog, Active) - Test" |
274-4 Atmospheric Pressure Sensor: Voltage Below Normal | Troubleshooting, "Sensor Signal (Analog, Active) - Test" |
274-13 Atmospheric Pressure Sensor: Calibration Required | Troubleshooting, "Pressure Sensor - Calibrate" |
291-5 Engine Cooling Fan Solenoid: Current Below Normal | Troubleshooting, "Cooling Fan Control - Test" |
291-6 Engine Cooling Fan Solenoid: Current Above Normal | Troubleshooting, "Cooling Fan Control - Test" |
296-9 Transmission Control: Abnormal Update Rate | Troubleshooting, "Data Link - Test" |
296-14 Transmission Control: Special Instruction | Troubleshooting, "Data Link Configuration Status - Test" |
338-5 Engine Pre-Lube Pump Relay: Current Below Normal | Troubleshooting, "Prelubrication - Test" |
338-6 Engine Pre-Lube Pump Relay: Current Above Normal | Troubleshooting, "Prelubrication - Test" |
342-8 Secondary Engine Speed Sensor: Abnormal Frequency, Pulse Width, or Period | Troubleshooting, "Speed/Timing - Test" |
460-3 Fuel Pressure Sensor - After Fuel Filter: Voltage Above Normal | Troubleshooting, "Sensor Signal (Analog, Active) - Test" |
460-4 Fuel Pressure Sensor - After Fuel Filter: Voltage Below Normal | Troubleshooting, "Sensor Signal (Analog, Active) - Test" |
460-21 Fuel Pressure Sensor - After Fuel Filter: Data Drifted Low | Troubleshooting, "Sensor Supply - Test" |
485-5 Engine Fan Reversing Solenoid: Current Below Normal | Troubleshooting, "Engine Fan Reversing Solenoid Circuit - Test" |
485-6 Engine Fan Reversing Solenoid: Current Above Normal | Troubleshooting, "Engine Fan Reversing Solenoid Circuit - Test" |
596-9 Implement Control: Abnormal Update Rate | Troubleshooting, "Data Link - Test" |
596-14 Implement Control: Special Instruction | Troubleshooting, "Data Link Configuration Status - Test" |
827-3 Left Exhaust Temperature Sensor: Voltage Above Normal | Troubleshooting, "Sensor Signal (Analog, Active) - Test" |
827-4 Left Exhaust Temperature Sensor: Voltage Below Normal | Troubleshooting, "Sensor Signal (Analog, Active) - Test" |
828-3 Right Exhaust Temperature Sensor: Voltage Above Normal | Troubleshooting, "Sensor Signal (Analog, Active) - Test" |
828-4 Right Exhaust Temperature Sensor: Voltage Below Normal | Troubleshooting, "Sensor Signal (Analog, Active) - Test" |
1076-5 Engine Cooling Fan Bypass Solenoid: Current Below Normal | Troubleshooting, "Cooling Fan Control - Test" |
1076-6 Engine Cooling Fan Bypass Solenoid: Current Above Normal | Troubleshooting, "Cooling Fan Control - Test" |
E1095(2) Low EGR Mass Flow Rate | Troubleshooting, "" |
E1096(1) High EGR Mass Flow Rate | Troubleshooting, "" |
1551-13 Engine Demand Fan System: Calibration Required | Troubleshooting, "Cooling Fan - Calibrate" |
1627-5 Fuel Pump Relay: Current Below Normal | Troubleshooting, "Fuel Priming Pump - Test" |
1627-6 Fuel Pump Relay: Current Above Normal | Troubleshooting, "Fuel Priming Pump - Test" |
1785-3 Intake Manifold Pressure Sensor: Voltage Above Normal | Troubleshooting, "Sensor Signal (Analog, Active) - Test" |
1785-4 Intake Manifold Pressure Sensor: Voltage Below Normal | Troubleshooting, "Sensor Signal (Analog, Active) - Test" |
1785-13 Intake Manifold Pressure Sensor: Calibration Required | Troubleshooting, "Pressure Sensor - Calibrate" |
1785-21 Intake Manifold Pressure Sensor: Data Drifted Low | Troubleshooting, "Sensor Supply - Test" |
1796-3 Intake Manifold #2 Air Temperature Sensor: Voltage Above Normal | Troubleshooting, "Sensor Signal (Analog, Passive) - Test" |
1796-4 Intake Manifold #2 Air Temperature Sensor: Voltage Below Normal | Troubleshooting, "Sensor Signal (Analog, Passive) - Test" |
1834-2 Ignition Key Switch loss of signal | Troubleshooting, "Electrical Power Supply - Test" |
1937-2 Engine Coolant Flow Switch: Erratic, Intermittent, or Incorrect | Troubleshooting, "Coolant Flow - Test" |
2131-3 5 Volt Sensor DC Power Supply #2:Voltage Above Normal | Troubleshooting, "Sensor Supply - Test" |
2131-4 5 Volt Sensor DC Power Supply #2:Voltage Below Normal | Troubleshooting, "Sensor Supply - Test" |
2350-3 Left Exhaust #2 Temperature: Voltage Above Normal | Troubleshooting, "Sensor Signal (Analog, Active) - Test" |
2350-4 Left Exhaust #2 Temperature: Voltage Below Normal | Troubleshooting, "Sensor Signal (Analog, Active) - Test" |
2351-3 Right Exhaust #2 Temperature: Voltage Above Normal | Troubleshooting, "Sensor Signal (Analog, Active) - Test" |
2351-4 Right Exhaust #2 Temperature: Voltage Below Normal | Troubleshooting, "Sensor Signal (Analog, Active) - Test" |
2417-5 Ether Injection Control Solenoid: Current Below Normal | Troubleshooting, "Ether Starting Aid - Test" |
2417-6 Ether Injection Control Solenoid: Current Above Normal | Troubleshooting, "Ether Starting Aid - Test" |
2526-3 Air Inlet Temperature Sensor: Voltage Above Normal | Troubleshooting, "Sensor Signal (Analog, Passive) - Test" |
2526-4 Air Inlet Temperature Sensor: Voltage Below Normal | Troubleshooting, "Sensor Signal (Analog, Passive) - Test" |
2602-5 Cylinder #1 Injector Actuator #2:Current Below Normal | Troubleshooting, "Injector Solenoid - Test" |
2602-6 Cylinder #1 Injector Actuator #2:Current Above Normal | Troubleshooting, "Injector Solenoid - Test" |
2604-5 Cylinder #2 Injector Actuator #2:Current Below Normal | Troubleshooting, "Injector Solenoid - Test" |
2604-6 Cylinder #2 Injector Actuator #2:Current Above Normal | Troubleshooting, "Injector Solenoid - Test" |
2606-5 Cylinder #3 Injector Actuator #2:Current Below Normal | Troubleshooting, "Injector Solenoid - Test" |
2606-6 Cylinder #3 Injector Actuator #2:Current Above Normal | Troubleshooting, "Injector Solenoid - Test" |
2608-5 Cylinder #4 Injector Actuator #2:Current Below Normal | Troubleshooting, "Injector Solenoid - Test" |
2608-6 Cylinder #4 Injector Actuator #2:Current Above Normal | Troubleshooting, "Injector Solenoid - Test" |
2610-5 Cylinder #5 Injector Actuator #2:Current Below Normal | Troubleshooting, "Injector Solenoid - Test" |
2610-6 Cylinder #5 Injector Actuator #2:Current Above Normal | Troubleshooting, "Injector Solenoid - Test" |
2612-5 Cylinder #6 Injector Actuator #2:Current Below Normal | Troubleshooting, "Injector Solenoid - Test" |
2612-6 Cylinder #6 Injector Actuator #2:Current Above Normal | Troubleshooting, "Injector Solenoid - Test" |
2614-5 Cylinder #7 Injector Actuator #2:Current Below Normal | Troubleshooting, "Injector Solenoid - Test" |
2614-6 Cylinder #7 Injector Actuator #2:Current Above Normal | Troubleshooting, "Injector Solenoid - Test" |
2616-5 Cylinder #8 Injector Actuator #2:Current Below Normal | Troubleshooting, "Injector Solenoid - Test" |
2616-6 Cylinder #8 Injector Actuator #2:Current Above Normal | Troubleshooting, "Injector Solenoid - Test" |
2618-5 Cylinder #9 Injector Actuator #2:Current Below Normal | Troubleshooting, "Injector Solenoid - Test" |
2618-6 Cylinder #9 Injector Actuator #2:Current Above Normal | Troubleshooting, "Injector Solenoid - Test" |
2620-5 Cylinder #10 Injector Actuator #2:Current Below Normal | Troubleshooting, "Injector Solenoid - Test" |
2620-6 Cylinder #10 Injector Actuator #2:Current Above Normal | Troubleshooting, "Injector Solenoid - Test" |
2622-5 Cylinder #11 Injector Actuator #2:Current Below Normal | Troubleshooting, "Injector Solenoid - Test" |
2622-6 Cylinder #11 Injector Actuator #2:Current Above Normal | Troubleshooting, "Injector Solenoid - Test" |
2624-5 Cylinder #12 Injector Actuator #2:Current Below Normal | Troubleshooting, "Injector Solenoid - Test" |
2624-6 Cylinder #12 Injector Actuator #2:Current Above Normal | Troubleshooting, "Injector Solenoid - Test" |
2738-3 Turbocharger #1 Compressor Inlet Pressure Sensor: Voltage Above Normal | Troubleshooting, "Sensor Signal (Analog, Active) - Test" |
2738-4 Turbocharger #1 Compressor Inlet Pressure Sensor: Voltage Below Normal | Troubleshooting, "Sensor Signal (Analog, Active) - Test" |
3385-3 EGR Intake Pressure Sensor: Voltage Above Normal | Troubleshooting, "Sensor Signal (Analog, Active) - Test" |
3385-4 EGR Intake Pressure Sensor: Voltage Below Normal | Troubleshooting, "Sensor Signal (Analog, Active) - Test" |
3385-13 EGR Intake Pressure Sensor: Calibration Required | Troubleshooting, "Sensor Calibration Required - Test" |
3385-21 EGR Intake Pressure Sensor: Data Drifted Low | Troubleshooting, "Sensor Supply - Test" |
3386-3 EGR Temperature Sensor: Voltage Above Normal | Troubleshooting, "Sensor Signal (Analog, Passive) - Test" |
3386-4 EGR Temperature Sensor: Voltage Below Normal | Troubleshooting, "Sensor Signal (Analog, Passive) - Test" |
3387-3 EGR Differential Pressure Sensor: Voltage Above Normal | Troubleshooting, "Sensor Signal (Analog, Active) - Test" |
3387-4 EGR Differential Pressure Sensor: Voltage Below Normal | Troubleshooting, "Sensor Signal (Analog, Active) - Test" |
3387-13 EGR Differential Pressure Sensor: Calibration Required | Troubleshooting, "Pressure Sensor - Calibrate" |
3405-5 EGR Valve Control: Current Below Normal | Troubleshooting, "NOx Reduction System (NRS) - Test" |
3405-6 EGR Valve Control: Current Above Normal | Troubleshooting, "NOx Reduction System (NRS) - Test" |
3409-5 Engine Exhaust Manifold Bank #1 Flow Balance Valve Solenoid: Current Below Normal | Troubleshooting, "Exhaust Balance Valve - Test" |
3409-6 Engine Exhaust Manifold Bank #1 Flow Balance Valve Solenoid: Current Above Normal | Troubleshooting, "Exhaust Balance Valve - Test" |
3468-2 Aftertreatment #1 Identification Number Module: Erratic, Intermittent, or Incorrect | Troubleshooting, "Aftertreatment Identification Module - Test" |
3468-8 Aftertreatment #1 Identification Number Module: Abnormal Frequency, Pulse Width, or Period | Troubleshooting, "Aftertreatment Identification Module - Test" |
3468-14 Aftertreatment #1 Identification Number Module: Special Instruction | Troubleshooting, "Aftertreatment Identification Module - Test" |
If any of the diagnostic codes listed in Table 2 are active, a E60021 event code will also be active.
When a E60021 event code is active, the engine will be derated.
To clear an active a E60021 event code, first troubleshoot any active codes that are listed in Table 2. Once all other codes are cleared, cycle the keyswitch to clear the E60021 event code.
CDL Code and Description |
---|
172-3
Intake Manifold Air Temperature Sensor : Voltage Above Normal |
172-4
Intake Manifold Air Temperature Sensor : Voltage Below Normal |
E1095(2)
Low EGR Mass Flow Rate |
E1096(1)
High EGR Mass Flow Rate |
1785-3
Intake Manifold Pressure Sensor : Voltage Above Normal |
1785-4
Intake Manifold Pressure Sensor : Voltage Below Normal |
1785-13
Intake Manifold Pressure Sensor : Out of Calibration |
1785-21
Intake Manifold Pressure Sensor : Data Drifted Low |
1796-3
Intake Manifold #2 Air Temperature Sensor : Voltage Above Normal |
1796-4
Intake Manifold #2 Air Temperature Sensor : Voltage Below Normal |
3031-3
Intake Manifold #2 Pressure Sensor : Voltage Above Normal |
3031-4
Intake Manifold #2 Pressure Sensor : Voltage Below Normal |
3031-13
Intake Manifold #2 Pressure Sensor : Out of Calibration |
3031-21
Intake Manifold #2 Pressure Sensor : Out of Calibration |
3385-3
EGR Intake Pressure Sensor : Voltage Above Normal |
3385-4
EGR Intake Pressure Sensor : Voltage Below Normal |
3385-13
EGR Intake Pressure Sensor : Out of Calibration |
3385-21
EGR Intake Pressure Sensor : Data Drifted Low |
3386-3
EGR Temperature Sensor : Voltage Above Normal |
3386-4
EGR Temperature Sensor : Voltage Below Normal |
3387-3
EGR Differential Pressure Sensor : Voltage Above Normal |
3387-4
EGR Differential Pressure Sensor : Voltage Below Normal |
3387-13
EGR Differential Pressure Sensor : Out of Calibration |
3405-5
EGR Valve Control : Current Below Normal |
3405-6
EGR Valve Control : Current Above Normal |
Diagnostic codes alert the operator that a problem in the electronic system has been detected. Diagnostic codes are also used by the service technician to identify the nature of the problem. Caterpillar Electronic Technician (ET) is a software program that is for a personal computer. The software can be used by the service technician to view the diagnostic code information for an ECM. Diagnostic codes may consist of the module identifier (MID), the component identifier (CID), and the failure mode identifier (FMI).
Component Identifier (MID) - The MID is a three-digit code that identifies the ECM that generated the diagnostic code. For example, the MID 036 identifies the engine ECM.
Component Identifier (CID) - The CID is a number with three or four digits. The CID indicates the component that generated the code. For example, the CID number 0001 identifies the fuel injector for the number one cylinder.
Failure Mode Identifier (FMI) - The FMI is a number that indicates the type of failure.
Refer to Table 1 for a complete list of the diagnostic codes and the appropriate troubleshooting procedure.
Note: Do not confuse diagnostic codes with event codes. Event codes alert the operator that an abnormal operating condition such as low oil pressure or high coolant temperature has been detected. If an event code is active, refer to Troubleshooting, "Event Codes".
Illustration 1 is an example of the operating range of a sensor.
Illustration 1 | g01365757 |
Example of the typical operating range of a sensor (1) This area represents the normal operating range of the engine parameter. (2) In these areas, the engine is operating in an unsafe operating range of the monitored parameter. An event code will be generated for the monitored parameter. The sensor circuit does not have an electronic problem. Refer to Troubleshooting, "Event Code List" for additional information on event codes. (3) In these areas, the signal from the sensor is outside of the operating range of the sensor. The sensor circuit has an electronic problem. A diagnostic code will be generated for the sensor circuit. |
An active diagnostic code represents a problem with the electronic control system. Correct the problem as soon as possible.
When the ECM generates an active diagnostic code, the "Active Alarm" indicator ("Engine Control Alarm Status" on Cat ET). This alarm is activated to alert the operator. If the condition that generated the code is momentary, the message disappears from the list of active diagnostic codes. The diagnostic code becomes logged.
When the ECM generates a diagnostic code, the ECM logs the code in permanent memory. The ECM has an internal diagnostic clock. Each ECM will record the following information when a code is generated:
- The hour of the first occurrence of the code
- The hour of the last occurrence of the code
- The number of occurrences of the code
This information is a valuable indicator for troubleshooting intermittent problems.
A code is cleared from memory when one of the following conditions occur:
- The service technician manually clears the code.
- The code does not recur for 100 hours.
- A new code is logged and there are already ten codes in memory. In this case, the oldest code is cleared.
Some diagnostic codes may be easily triggered. Some diagnostic codes may log occurrences that did not result in complaints. The most likely cause of an intermittent problem is a faulty connection or damaged wiring. The next likely cause is a component failure. The least likely cause is the failure of an electronic module. Diagnostic codes that are logged repeatedly may indicate a problem that needs special investigation.
Note: Always clear logged diagnostic codes after investigating and correcting the problem which generated the code.