SEAT 3257693 - Caterpillar

Illustration 1 g00573982
Schematic For The 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 for 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 Result: The voltage should measure 9.0 0.5.Results:
OK - The voltage is correct. If the FMI 04 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.
Disconnect the Quad Gauge Cluster Modules.
Turn the "ECS" switch to the OFF/RESET position.
Disconnect the Quad Gauge Cluster Modules.
Turn the ECS switch to the COOLDOWN/STOP position.
At the engine harness connector for the Main Display Module, measure the voltage from connector contact 34 to connector contact 2 (ground).
Reconnect the Quad Gauge Cluster Modules one at a time. Between reconnecting the Modules, record the voltage of the display power supply.Expected Result: The voltage should be 9.0 0.5 DCV after each of the Quad Gauge Cluster Modules have been reconnected.Results:
OK - The voltage is correct. The Display Power Supply is correct. Proceed to Step 3.
Not OK - The voltage is not correct after reconnecting one of the Quad Gauge Cluster Modules. The Quad Gauge Cluster Module that affected the voltage has a problem. Replace the Quad Gauge Cluster Module. For more information on this subject, see Testing And Adjusting, "Module - Replace"STOP.
Check for a Short to Ground.
Turn the "ECS" switch to the OFF/RESET position.
Disconnect the machine harness from the main display module.
At the machine harness connector for the Main Display Module, measure the resistance between connector contact 34 and connector contact 2.Expected Results: The resistance should be greater than 5000 ohms.Results:
OK - The resistance of the harness circuit is correct. The Main Display Module is faulty. Replace the Main Display Module. See Testing And Adjusting, "Module - Replace".
Not OK - The resistance of the harness circuit is incorrect. The machine harness is faulty. Repair the harness or replace the harness.