P1277

P1277-STARTER CONTROL CIRCUIT 2 LOW - DIESEL

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

- When Monitored:
With the ignition on. Battery voltage greater than 10.4 volts and the ASD sense switch is on.

- Set Condition:
Actual Starter state is not equal to desired state. One Trip Fault.Three good trips to turn off the MIL.





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

1. ACTIVE DTC
1. Ignition on, engine not running.
2. With a scan tool, select View DTCs.

Is the DTC active at this time?

Yes

- Go To 2

No

- Perform the INTERMITTENT CONDITION - DIESEL Diagnostic Procedure. Intermittent Condition Test.

2. (T750) STARTER CONTROL OUTPUT CIRCUIT SHORTED TO GROUND




1. Turn the ignition off.
2. Disconnect the C9 TIPM harness connector.
3. Disconnect the Starter Solenoid connector.
4. Measure the resistance between ground and the (T750) Starter Control Output circuit in the Starter Solenoid harness connector.

Is the resistance below 100 Ohms?

Yes

- Repair the short to ground in the (T750) Starter Control Output circuit.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

No

- Go To 3

3. TIPM OPERATION




1. Using a 12-volt test light connected ground, probe the (T750) Stater Control Output circuit terminal at the C9 TIPM connection.
2. Crank the engine.

Does the test light illuminate brightly?

Yes

- Go To 4

No

- Replace the TIPM
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test.

4. STARTER




1. Turn the ignition off.
2. Connect the C9 TIPM harness connector.

NOTE: The Stater Solenoid harness connector must remain disconnected at this time.

3. Have an assistant turn the ignition key to the CRANK position.
4. Using a 12-volt test light connected ground, probe the (T750) Stater Control Output circuit in the Starter Solenoid harness connector while the ignition key is in the CRANK position.

Does the test light illuminate brightly?

Yes

- Replace the Starter.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test.

No

- Replace the Powertrain Control Module.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test.