MODULE GP-ALARM 1879370 - Caterpillar

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Illustration 1 g00573861
Schematic For The Alarm. (1) Locomotive Engines - 410-WH: Marine Engines and Generator Set Engines - D25-GN.This diagnostic code is recorded when the Main Display Module reads the voltage of the circuit of the Action Alarm as above normal. Also, this diagnostic code is recorded when the circuit is shorted to +battery. As a result of this diagnostic condition, the Action Alarm sounds continuously.
Check The Alarm Circuit.
Turn the "ECS" switch to the OFF/RESET position.
Check for loose terminal connections or corroded terminal connections to the Action Alarm.
Clean the corroded terminals and tighten the loose connections.
Do Not disconnect the harness from the Main Display Module.
Turn the "ECS" switch to the COOLDOWN/STOP position.
Listen for the sounding of the Action Alarm.Expected Result: The alarm should not sound.Results:
OK - The alarm does not sound. The Main Display Module has a problem. Replace the Main Display Module. For more information, see Testing And Adjusting, "Module - Replace".
Not OK - The alarm sounds. There is a short between the circuit of the Action Alarm and +Battery in the engine harness. Repair the engine harness or replace the engine harness.