BASE AS 5251493 - Caterpillar

Illustration 1 g00737908
Schematic for the display power supply
This diagnostic code is recorded when the main display module reads the voltage of the display power supply circuit and the voltage is above normal. Normal display power supply voltage is 9.0 0.5 DCV. The schematic that is shown above represents a typical installation of the component. Verify the connector contact and wire numbers by using the Electrical System Schematic for the machine that is being serviced.Test Step 1. CHECK THE VOLTAGE AT THE MAIN DISPLAY MODULE.
Use the 7X-1710 Multimeter Probe Group. Check the voltage at the connector for the main display module. Measure the voltage from the contact 34 to the contact 2 (ground).
DO NOT disconnect the harness from the module.
The correct voltage should measure 9.0 0.5 DCV. Expected Result:The voltage that is measured is 9.0 0.5 DCV.Results:
OK - The voltage is 9.0 0.5 DCV. The display power supply voltage is correct. Check the main display module for the same diagnostic code. If the service code indicator is still ON, the main display module has failed.Repair: It is unlikely that the main display module has failed. Exit this procedure and perform this procedure again. Also, recheck if the diagnostic code indicator is illuminated for this diagnostic code. If the cause of the diagnostic code is not found, replace the main display module. See Testing and Adjusting, "Module - Replace".STOP
NOT OK - The voltage is NOT 9.0 0.5 DCV. The display power supply voltage is NOT correct. Proceed to test step 2.Test Step 2. CHECK THE HARNESS FOR A SHORT TO +BATTERY.
Disconnect the machine harness from the main display module.
At the machine harness connector for the main display module, measure the voltage from the connector contact 34 to 2 (ground). Expected Result:The voltage that is measured is 0.0 0.5 DCV.Results:
OK - The voltage is 0.0 0.5 DCV. The voltage is correct. The main display module has failed.Repair: It is unlikely that the main display module has failed. Exit this procedure and perform this procedure again. Also, recheck if the diagnostic code indicator is illuminated for this diagnostic code. If the cause of the diagnostic code is not found, replace the main display module. See Testing and Adjusting, "Module - Replace".STOP
NOT OK - The voltage is NOT 0.0 0.5 DCV. The harness has failed.Repair: Repair the harness or replace the harness.STOP