Where are trouble codes stored in an ECM?
If there is an engine malfunction caused or detected by any one of the many sensors connected to the ECM, a trouble code will be stored in NVM, or Non-Volatile Memory. What you need to do first is find out what trouble codes are presently stored in the ECM. You can read these trouble codes in several different ways.
What does trouble code 14 on GM ECM mean?
NOTE: If codes 21 and/or 22 are also present cause ‘4’ above should be checked first. Trouble Code 14 indicates that the Coolant Temperature Sensor (CTS) is reporting abnormally high readings. CTS is used to control fuel mixture, timing, idle speed, TCC and EGR operations among others.
What does trouble code 22 on GM W-body ECM mean?
NOTE: Presence of codes 33 and/or 34 may indicate that the MAP sensor is defective and is reading less than expected. This may cause the above set-conditions to be met falsely and this code to be set. Trouble Code 22 indicates that the Throttle Position Sensor (TPS) is reading abnormally low.
When does the ECM detect no ignition reference pulses from the ignition module?
When the ECM detects no ignition reference pulses from the ignition module when the ignition is in the ‘ON’ position, it illuminates the Check Engine Lamp (CEL), but does not log this code as it would other codes.
How to troubleshoot an ICM error code on a Harley?
Speedometer Self Diagnostics: The speedometer is capable of displaying and clearing speedometer, tachometer, TSM/TSSM and ICM/ECM Diagnostic Trouble Codes (DTC). Turn Ignition switch to OFF & Run/Stop switch is to Run. Push odometer reset button in & hold. Turn ignition switch to Ignition and release the odometer reset button.
What happens if the error code is not a current code?
Also if the code set is a historic code (not a constant light) after 50 start and run cycles of at least 30 seconds each in duration, the light will extinguish itself as long as the error hasn’t occurred again. If it were a current code, the light would remain lit while running. Above codes can also be set if 02 sensor fails.
How do you find the PCM code on a Harley Davidson Softail?
Press and hold the odometer button to access the PCM codes once the “P” is flashing. If a code is present, the code will display. Record the code number to research possible causes. Press and hold the odometer button to clear the code, and then shut off the ignition to exit the menu.
How do you close the Diagnostic Code on a Harley Davidson?
This is a modal window. This modal can be closed by pressing the Escape key or activating the close button. This is a modal window. This modal can be closed by pressing the Escape key or activating the close button. The Twin Cam allows us to see the Harley error codes also known as the diagnostic trouble codes.