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Active Diagnostic Codes
An active diagnostic code represents a problem with the electronic control system. Correct the condition as soon as possible. If the condition that generates the diagnostic code occurs only for a brief moment, the message will disappear and the diagnostic code will be logged in the memory of the Electronic Control Module (ECM).Logged Diagnostic Codes
When the ECM generates a diagnostic code, the ECM will log the code in the permanent memory of the ECM. The ECM has a diagnostic clock that is internal. This clock records the hour of the first occurrence, the hour of the last occurrence, and the number of occurrences of the code. Knowing the timing of the code and knowing the frequency of the code can be a valuable indicator. These indicators are helpful when problems that are intermittent are being investigated.Note: Cat ET can be used to retrieve logged codes and Cat ET can be used to erase logged codes. Logged diagnostic codes will automatically be deleted if no additional occurrences are recorded in 100 hours. Be aware of the following information when logged diagnostic codes are investigated.
Some diagnostic codes may log occurrences that did not result in operator complaints. A diagnostic code is logged at a specific time. This time should correlate to a complaint. A repair may not be necessary if there is no correlation.
The most likely cause of an intermittent problem is a faulty connection or damaged wiring. The next most likely cause of an intermittent failure is a component failure such as a sensor or a switch. The least likely cause of an intermittent problem is a failure of the ECM.
Diagnostic codes that are logged repeatedly may indicate a problem that needs special investigation.
The code number will direct you to a procedure in troubleshooting guide. If the symptoms continue, use the proper procedure for troubleshooting the symptoms that have been experienced by the operator. Refer to Troubleshooting Without A Diagnostic Code.Note: Always clear logged diagnostic codes after investigating and correcting the problem which generated the code.
Illustration 1 g01040769
Output voltage from a typical analog temperature sensor
Illustration 1 indicates the signal range for a typical analog sensor. Diagnostic codes will be generated if the output signal for the sensor is below 0.2 VDC or above 4.8 VDC.Cross-Reference for SPN-FMI Code to CID-FMI (Diagnostics)
Portions of this material are reprinted with permission from SAE J1939DA_201607© 2016 SAE International. SAE International is not responsible for any use or translation of this material, in whole or in part. Please contact SAE International to obtain a complete copy of SAE J1939DA_201607, the official definitive source of this standard.
Table 1
Cross-Reference for SPN-FMI Code to CID-FMI (Diagnostics)
SPN/FMI Code CID-FMI or EID Description of Code
91-08 91-08 Throttle Position signal abnormal
94-03 94-03 Fuel Pressure open/short to +batt
94-04 94-04 Fuel Pressure short to ground
100-03 100-03 Engine Oil Pressure open/short to +batt
100-04 100-04 Engine Oil Pressure short to ground
108-03 274-03 Atmospheric Temperature Sensor open/short to +batt
108-04 274-04 Atmospheric Temperature Sensor short to ground
110-03 110-03 Engine Coolant Temperature open/short to +batt
110-04 110-04 Engine Coolant Temperature short to ground
102-03 273-03 Turbo Outlet Pressure open/short to +bat
102-04 273-04 Turbo Outlet Pressure short to ground
168-02 168-02 System Voltage intermittent/erratic
105-03 172-03 Inlet Manifold Temp Sensor open/short to +batt
105-04 172-04 Inlet Manifold Temp Sensor short to ground
174-03 174-03 Fuel Temperature open/short to +batt
174-04 174-04 Fuel Temperature short to ground
190-02 190-02 Loss of Engine Speed Signal
190-11 190-011 Engine Speed Sensor mechanical failure
620-03 262-03 5 Volt Sensor DC Power Supply short to +batt
620-04 262-04 5 Volt Sensor DC Power Supply short to ground
637-13 261-13 Engine Timing calibration required
234-02 253-02 Personality Module mismatch
651-11 1-11 Injector Cylinder #1 fault
652-11 2-11 Injector Cylinder #2 fault
653-11 3-11 Injector Cylinder #3 fault
654-11 4-11 Injector Cylinder #4 fault
655-11 5-11 Injector Cylinder #5 fault
656-11 6-11 Injector Cylinder #6 fault
678-03 41-03