TIP-ABRASION 6I8803 - Caterpillar

Illustration 1 g00573982
Schematic For Display Power Supply. (1) Locomotive Engines - A304-RD: Marine Engines And Generator Set Engines - 049-OR.This diagnostic code is recorded when the Main Display Module reads the voltage of contact 34 below normal or the voltage is shorted to ground. Normal supply voltage is 9.0 0.5 DCV.
Measure The Voltage At The Main Display Module.
Turn the "ECS" switch to the COOLDOWN/STOP position.
Use the 7X-1710 Multimeter Probe to measure the voltage at the connector of the Main Display Module. The voltage should be measured from contact 34 to contact 2.
Do not disconnect the harness from the Main Display Module.Expected Results: The voltage should be 9.0 0.5 DCV.Results:
OK - The voltage is correct. The display power supply is correct. If the FMI 03 diagnostic code is still active, the Main Display Module has a problem. Replace the Main Display Module. For more information on this subject, see Testing And Adjusting, "Module - Replace".
Not OK - The voltage is not correct. The display power supply has a problem. Proceed to Step 2.
Check The Harness For A Short To +Battery.
Turn the "ECS" switch to the OFF/RESET position.
Disconnect the engine harness from the Main Display Module.
At the engine harness connector for the Main Display Module, measure the resistance from connector contact 34 to connector contact 1 (+battery).Expected Result: The resistance should be less than 5000 ohms.Results:
OK - The resistance is correct. The engine harness has a problem. There is a short between +battery and the 9.0 0.5 DCV. The short is in the circuit for the display power supply that is located in the engine harness. STOP.
Not OK - The resistance is NOT correct. The Main Display Module has a problem. Replace the Main Display Module. For more information on this subject, see Testing And Adjusting, "Module - Replace".