5000 - 5999: 5105

5105-IMPLAUSIBLE ENGINE TIME OFF MESSAGE RECEIVED

For a complete wiring diagram Refer to the Wiring Information Electrical Diagrams.

- When Monitored:
Ignition on and battery voltage greater than 10 volts.

- Set Condition:
ECM failed to detect Engine Run message.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.

1. ECM IGNITION CIRCUITS
1. Turn the ignition off.
2. Disconnect the C1 ECM harness connector.
3. With a 12-volt test light connected to ground and with special tool #8815 installed, probe the (F1), (F26), and (F942) Fused Ignition Switch circuits.
4. Perform the above check with the Ignition key in the off lock position, Ignition on, engine not running position, and during cranking.
5. Wiggle the related wire harness while probing the special tool with the test light to try to interrupt the circuit.

Does the test light illuminate brightly?

Yes

- Go To 2

No

- Repair the open or excessive resistance in the (F1), (F26), and (F942) Fused Ignition Switch (Off, Run, Start) circuits. Inspect the related fuse, if the fuse is open check the circuits for a short to ground.
- Perform the ECM VERIFICATION TEST Verification Tests.

2. ECM
1. The Engine Control Module is reporting internal errors.

NOTE: Before continuing, check the ECM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

2. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

Were there any problems found?

Yes

- Repair as necessary.
- Perform the ECM VERIFICATION TEST Verification Tests.

No

- Replace and program the Engine Control Module.
- Perform the ECM VERIFICATION TEST Verification Tests.