ELECTRICAL AR 4864305 - Caterpillar

The Electronic Control Module (ECM) has detected a high current condition (short circuit) after attempting to activate the glow plug starting aid.The ECM detects the following conditions:
The engine is not cranking.
The ECM has been powered for at least 1 second.
There is a high current condition (short circuit) for more than 2 seconds.System Response:An ECM that was previously blank will require a total of 2 hours of operation before the diagnostic code will be logged.The ECM will log the code. A warning will appear on the display on the control panel. The ECM is unable to activate the relay for the glow plug starting aid. The glow plugs will not operate or the glow plugs will operate all the time.Possible Performance Effect:The engine may be difficult to start in cold temperatures and the exhaust may emit white smoke.Troubleshooting:Test Step 1. Perform the following diagnostic procedure: "Starting Aid (Glow Plug) Relay Circuit - Test"Results:
OK - STOP