SHAFT GP-OUTPUT 3929465 - Caterpillar

Illustration 1 g01077916
Schematic of the Action lamp
This diagnostic code is recorded when the current of the action lamp circuit (wire 411-PK(Pink)) is below normal. There is an open circuit. Note: The dash indicators illuminate for three seconds at the beginning of power up self test. System Response:The action lamp does not light when this diagnostic code is active.Test Step 1. CHECK THE ACTION LAMP.
Turn the disconnect switch and the key start switch to the OFF position.
Replace the action lamp with a known working lamp.
Turn the disconnect switch and the key start switch to the ON position.
Observe the action lamp. Expected Result:The action lamp turns ON at the beginning of the power up self test. Results:
OK - The action lamp turns ON at the beginning of the power up self test.Repair: The lamp was open.STOP
NOT OK - The diagnostic code CID 0374 FMI 05 is still active. The action lamp is not causing the diagnostic code. Proceed to test step 2.Test Step 2. CHECK THE HARNESS.
Turn the disconnect switch and the key start switch to the OFF position.
Disconnect the connector J1 of the machine harness from the VIMS electronic control module.
Turn the disconnect switch and the key start switch to the ON position.
At the machine harness connector for the VIMS electronic control module, check the voltage at contact J1-1 (105-RD(Red)). The voltage must be above 20.5 DCV in order to illuminate the action lamp.
Turn the disconnect switch and the key start switch to the OFF position.
Place a jumper wire between contact J1-1 (105-RD(Red)) and contact J1-24 (411-PK(Pink)).
At the machine harness connector, place a jumper from contact J1-2 (201-BK(Black)) to frame ground.
Turn the disconnect switch and the key start switch to the ON position. Expected Result:The action lamp illuminates.Results:
OK - The action lamp illuminates. The machine harness is correct. Repair: Replace the VIMS electronic control module. Refer to the Testing and Adjusting, "Module - Replace".STOP
NOT OK - The action lamp DOES NOT illuminate. The harness is an open circuit. Proceed to test step 3.Test Step 3. CHECK FOR AN OPEN IN THE HARNESS.
At the action lamp, disconnect the signal wire 411-PK(Pink) and the ground wire 201-BK(Black) from the dash socket.
Jumper the two wires together.
Check for an open circuit in the signal wire.
Measure the resistance between contact J1-24 (wire 411-PK(Pink)) and contact J1-2 (wire 201-BK(Black)).Expected Result:The resistance is less than 5 ohms.Results:
OK - The resistance is less than 5 ohms. The circuit is correct.Repair: The initial condition was probably caused by a poor electrical connection or a short at one of the harness connectors. Resume normal operation.STOP
NOT OK - The resistance is greater than 5 ohms. The circuit is open.Repair: Repair the machine harness or replace the machine harness. STOP