KIT-LOCK DOOR 4258405 - Caterpillar

Table 2
Troubleshooting Test Steps Values Results
8. Check the Operation of the ECM
A. Turn the keyswitch to the OFF position.
B. Check the operation of the ECM by creating an open at the ECM.
Note: Disconnecting the return wire from the ECM will generate an open circuit diagnostic code for all sensors that are connected to the return wire. Ignore the additional codes. Troubleshoot the original diagnostic code and clear the codes when you are finished.
C. Turn the keyswitch to the ON position.
D. Monitor the "Active Diagnostic Code" screen on Cat ET. Wait at least 15 seconds so that any codes may become active.
Note: An -03 diagnostic code should be active for the suspect sensor.
E. Turn the keyswitch to the OFF position.
F. Check the operation of the ECM by creating a short circuit at the ECM.
G. Turn the keyswitch to the ON position.
H. Monitor the "Active Diagnostic Code" screen on Cat ET. Wait at least 15 seconds so that any codes may become active.
Note: A short circuit diagnostic code (04) should be active when the wire jumper is installed.
I. Turn the keyswitch to the OFF position.
J. Remove the jumper wire. Return the wiring to the original configuration.
03 diagnostic code
Result: The ECM is operating properly. There is a problem in the wiring between the ECM and the sensor connector.
Repair: If the code is active for more than one sensor, the problem is most likely in the return wire for the sensor. The problem may be in a connector. Repair the return wire and/or the connector. Replace parts, if necessary. If the code is only active for one sensor, the problem is most likely in the signal wire for the sensor. Repair the signal wire and/or the connector. Replace parts, if necessary. Verify that the problem is resolved.
STOP
Results: One of the following conditions exists: The -03 diagnostic code is not active when the signal wire is disconnected. The -04 diagnostic code is not active when the wire jumper is installed.
Repair: Replace the ECM. Refer to Troubleshooting, "Replacing the ECM". Verify that the problem is resolved.
STOP