Cross-Reference Information for Diagnostic Codes
Table 1 is a list of the diagnostic codes for the engine. The diagnostic codes are cross-referenced with the appropriate procedure that can be used to troubleshoot the code.
Further explanations of diagnostic codes are explained after Table 1.
| Cross-Reference from CID-FMI Code on Cat Data Link to Troubleshooting Procedure | |||
|---|---|---|---|
| Code | Description | Flash Code | Procedure |
| 17-05 | Shut Off Solenoid current low | 45 | Troubleshooting, "Fuel Shutoff - Test" |
| 17-06 | Shut Off Solenoid current high | 45 | Troubleshooting, "Fuel Shutoff - Test" |
| 23-02 | Engine Power Excessive | 48 | Troubleshooting, "Fuel Rack Solenoid - Test" |
| 23-05 | Rack BTM current low | 43 | Troubleshooting, "Fuel Rack Solenoid - Test" |
| 23-06 | Rack BTM current high | 43 | Troubleshooting, "Fuel Rack Solenoid - Test" |
| 24-03 | Rack Sensor voltage high | 22 | Troubleshooting, "Sensor Signal (Analog, Active) - Test" |
| 24-04 | Rack Sensor voltage low | 22 | Troubleshooting, "Sensor Signal (Analog, Active) - Test" |
| 24-07 | Rack System Fault | 43 | Troubleshooting, "Sensor Signal (Analog, Active) - Test" |
| 24-10 | Rack signal rate of change | 22 | Troubleshooting, "Sensor Signal (Analog, Active) - Test" |
| 91-08 | Throttle Position Invalid | 32 | Troubleshooting, "Speed Control (PWM) - Test" |
| 91-10 | Throttle signal rate of change | 32 | Troubleshooting, "Speed Control (PWM) - Test" |
| 100-01 | Low Oil Pressure Warning | 46 | Troubleshooting, "Oil Pressure Is Low" |
| 100-03 | Oil Pressure voltage high | 24 | Troubleshooting, "Sensor Signal (Analog, Active) - Test" |
| 100-04 | Oil Pressure voltage low | 24 | Troubleshooting, "Sensor Signal (Analog, Active) - Test" |
| 100-10 | Oil Pressure signal rate of change | 24 | Troubleshooting, "Sensor Signal (Analog, Active) - Test" |
| 102-00 | Excessive Boost Pressure | 25 | Troubleshooting, "Boost Pressure Is High" |
| 102-01 | Low Boost Pressure | 25 | Troubleshooting, "Boost Pressure Is Low" |
| 102-03 | Boost Pressure voltage high | 25 | Troubleshooting, "Inlet Manifold Pressure - Test" |
| 102-04 | Boost Pressure voltage low | 25 | Troubleshooting, "Inlet Manifold Pressure - Test" |
| 102-13 | Boost Pressure out of calibration | 42 | Troubleshooting, "Inlet Manifold Pressure - Test" |
| 106-01 | Low Atmospheric Pressure | 26 | The engine derates |
| 106-03 | Atmospheric Pressure voltage high | 26 | Troubleshooting, "Atmospheric Pressure - Test" |
| 106-04 | Atmospheric Pressure voltage low | 26 | Troubleshooting, "Atmospheric Pressure - Test" |
| 106-10 | Atmospheric Pressure signal rate of change | 26 | Troubleshooting, "Atmospheric Pressure - Test" |
| 110-00 | High Coolant Temperature Warning | 61 | Troubleshooting, "High Coolant Temperature" |
| 110-03 | Coolant Temperature voltage high | 27 | Troubleshooting, "Coolant Temperature - Test" |
| 110-04 | Coolant Temperature voltage low | 27 | Troubleshooting, "Coolant Temperature - Test" |
| 111-01 | Low Coolant Level Warning | 62 | Add coolant and check for leaks. |
| 168-02 | ECM Battery Power Intermittent | 51 | Troubleshooting, "Electrical Power Supply - Test" |
| 190-00 | Engine Overspeed Warning | 35 | Troubleshooting, "Engine Overspeeds" |
| 190-02 | Primary Engine Speed loss of signal | 34 | Troubleshooting, "Engine Speed - Test" |
| 190-08 | Primary Engine Speed loss of signal | 33 | Troubleshooting, "Engine Speed - Test" |
| 190-10 | Engine Speed rate of change | 34 | Troubleshooting, "Engine Speed - Test" |
| 241-00 | 5 Volt Open Circuit | 21 | Troubleshooting, "Sensor Supply - Test" |
| 241-01 | 5 Volt Short Circuit | 21 | Troubleshooting, "Sensor Supply - Test" |
| 241-02 | 8 Volt Open Circuit | 21 | Troubleshooting, "Sensor Supply - Test" |
| 241-03 | 8 Volt Short Circuit | 21 | Troubleshooting, "Sensor Supply - Test" |
| 252-11 | Engine Software Incorrect | 50 | Troubleshooting, "ECM/Personality Module - Test" |
| 252-12 | Personality Module Fault | 52 | Troubleshooting, "ECM/Personality Module - Test" |
| 253-02 | Check Customer or System Parameters | 56 | Troubleshooting, "ECM/Personality Module - Test" |
| 254-12 | ECM Fault | 53 | Troubleshooting, "ECM/Personality Module - Test" |
Diagnostic Codes
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 designed to run on a personal computer. The software can be used by the service technician in order to view the diagnostic code information for an ECM. Diagnostic codes may consist of the component identifier (CID), and the failure mode identifier (FMI).
Component Identifier (CID) - The CID indicates the component that generated the code. For example, the CID number 1 identifies the fuel injector for the number one cylinder.
Failure Mode Identifier (FMI) - The FMI indicates the type of failure. Refer to Table 2 for a complete list of the two digit codes.
| FMI | Failure |
|---|---|
| 00 | Data is above the normal range. |
| 01 | Data is below the normal range. |
| 02 | Incorrect signal |
| 03 | Voltage is above the normal range. |
| 04 | Voltage is below the normal range. |
| 05 | Current is below the normal range. |
| 06 | Current is above the normal range. |
| 08 | Abnormal signal |
| 09 | Abnormal update |
| 12 | A device or a component failed. |
| 13 | A component is out of calibration. |
Refer to Table 1 for a complete list of the diagnostic codes and the appropriate troubleshooting procedure.
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. (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. | |
Active Diagnostic Codes
An active diagnostic code represents a problem with the electronic control system. Correct the problem as soon as possible.
When the engine's ECM generates an active diagnostic code, the "Active Alarm" indicator ("Engine Control Alarm Status" on Cat ET) is activated in order 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.
Logged Diagnostic Codes
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.
Flash Codes
Flash codes are used to represent diagnostic codes in the electronic system in order to alert the operator that a problem exists. The flash codes are a two digit number. A series of flashes represents the flash code on the diagnostic lamp.
EXAMPLE
Note: Flash Code 27 would flash on the diagnostic lamp in the following manner:
- Two short flashes
- Hesitation
- Seven short flashes
| Flash Code | Description | Procedure |
|---|---|---|
| 21 | Sensor Supply Voltage Fault | Troubleshooting, "Sensor Supply - Test" |
| 22 | Rack Position Sensor Fault | Troubleshooting, "Sensor Signal (Analog, Active) - Test" |
| 24 | Engine Oil Pressure Fault | Troubleshooting, "Sensor Signal (Analog, Active) - Test" |
| 25 | Boost Pressure Sensor Fault | Troubleshooting, "Inlet Manifold Pressure - Test" |
| 26 | Atmospheric Pressure Sensor Fault | Troubleshooting, "Atmospheric Pressure - Test" |
| 27 | Coolant Temperature Sensor Fault | Troubleshooting, "Coolant Temperature - Test" |
| 32 | Throttle Position Sensor Fault | Troubleshooting, "Speed Control - Test" |
| 33 | Engine RPM Signal Fault | Troubleshooting, "Speed Control - Test" |
| 34 | Loss of Engine RPM Signal | Troubleshooting, "Speed Control - Test" |
| 35 | Engine Overspeed Warning | Troubleshooting, "Speed Overspeeds" |
| 42 | Boost Pressure Sensor Calibration | Troubleshooting, "Inlet Manifold Pressure - Test" |
| 43 | Fault for the Fuel Rack | Troubleshooting, "Sensor Signal (Analog, Active) - Test" |
| 45 | Fault of the Fuel Shutoff Solenoid | Troubleshooting, "Fuel Shutoff - Test" |
| 46 | Low Oil Pressure Warning | Troubleshooting, "Oil Pressure Is Low" |
| 48 | Excessive Engine Power | Troubleshooting, "Fuel Rack Solenoid - Test" |
| 51 | Intermittent Battery Power to the ECM | Troubleshooting, "Electrical Power Supply - Test" |
| 52 | Personality Module Fault | Troubleshooting, "ECM/Personality Module - Test" |
| 53 | ECM Fault | Troubleshooting, "ECM/Personality Module - Test" |
| 56 | Check the Parameters for the System Configuration and Customer Parameters. | Troubleshooting, "ECM/Personality Module - Test" |
| 61 | High Coolant Temperature Warning | Troubleshooting, "High Coolant Temperature" |
| 62 | Low Coolant Level Warning | Troubleshooting, "Coolant Level - Test" |