CONTROL GP-COMMUNICATION 3916340 - Caterpillar

Illustration 2 g02632960
Pin locations on the P1 connector for the ignition keyswitch and battery supply circuit (48) Battery+ (52) Battery+ (53) Battery+ (55) Battery+ (61) Battery ground (62) Shutdown override (63) Battery ground (65) Battery ground (67) Battery ground (70) Ignition key switchTest Step 1. Inspect Electrical Connectors and Wiring
Thoroughly inspect the battery connections and the connections to the keyswitch. Refer to Troubleshooting, "Electrical Connectors - Inspect" for details.
Perform a 45 N (10 lb) pull test on each of the wires in the ECM connector that are associated with the following connections:
P1: 48, 52, 53, 55 (Unswitched Battery+)
P1: 61, 63, 65, 67 (Battery-)
P1:62 (shutdown override)
P1:70 (keyswitch)
Use the electronic service tool to perform a "Wiggle Test".
Check the ECM connector for the correct torque of 6 N m (53 lb in).
Check the harness for abrasion and for pinch points from the battery to the ECM, and from the keyswitch to the ECM.Results:
All connectors, pins, and sockets are correctly connected and/or inserted and the harness is free of corrosion, of abrasion or of pinch points. - Proceed to Test Step 2.
There is a fault with the connectors and/or the harness. - Repair: Repair the connectors or the harness and/or replace the connectors or the harness. Ensure that all of the seals are correctly in place and ensure that the connectors are correctly connected.Use the electronic service tool in order to clear all logged diagnostic codes and then verify that the repair eliminates the fault.STOPTest Step 2. Check for Active Diagnostic Codes or Logged Diagnostic Codes
Connect the electronic service tool to the diagnostic connector.
Turn the keyswitch to the ON position.
Monitor the active diagnostic code screen on the electronic service tool. Check and record any active diagnostic codes or logged diagnostic codes.Note: Wait at least 30 seconds in order for the diagnostic codes to become active.Expected Result:One of the following diagnostic codes is active or logged:
168-2 Battery Potential / Power Input 1 : Erratic, Intermittent or Incorrect
168-3 Battery Potential / Power Input 1 : Voltage Above Normal
168-4 Battery Potential / Power Input 1 : Voltage Below NormalResults:
One of the preceding diagnostic codes is active or logged - Proceed to Test Step 3.
No diagnostic code is active. - Repair: The fault is no longer present. If the fault is intermittent, refer to Troubleshooting, "Electrical Connectors - Inspect".STOPTest Step 3. Check the Batteries
Load-test the batteries. Use a suitable battery load tester. Refer to Systems Operation, Testing and Adjusting, "Battery - Test" for the correct procedure.Results:
The batteries pass the load test. The measured voltage is at least 22.0 VDC - Proceed to Test Step 4.
The batteries do not pass the load test. The measured voltage is less than 22.0 VDC. - Repair: Recharge or replace the faulty batteries.Use the electronic service tool in order to clear all logged diagnostic codes and then verify that the repair eliminates the fault.STOPTest Step 4. Check the Battery Voltage at the ECM Connector
Disconnect the P1 connector from the ECM.
Turn the keyswitch to the ON position.Note: The measured voltage should be