Electrical Information Reference

1. Diagnostic System Check - Vehicle.
2. Carry out the battery inspection test Battery Inspection/Test.
3. Select Park or Neutral.
4. With a scan tool verify that no Theft Deterrent DTC's are set.



5. Connect the DMM set to volts to the battery posts (1) record reading .
6. Observe the scan tool, turn the ignition key to the start position Crank Request should be activated on screen.

⇒	If Crank Request is not present. Connect a DMM to the ignition start crank circuit of the ECM, with the key in the start position the DMM should read Battery voltage.

⇒	If voltage is not within 1 volt of battery voltage connect a DMM to the crank out at the ignition switch.

⇒	If voltage is within 1 voltage, inspect circuit for open/high resistance or short to ground open/high resistance.

7. If Crank Request is present remove the starter motor relay.



8. Connect a DMM to the starter motor relay (1) control circuit, turn the ignition key to the crank position.

⇒	If voltage is not within 1 volt of battery voltage then check circuit for open/high resistance or short to ground.




9. Connect the a DMM to the supply voltage of the starter motor relay (1) and a known ground.

⇒	If voltage is not within 1 volt of battery voltage inspect the circuit for open/high resistance or short to ground.

⇒	Refit starter motor relay.




10. Connect a DMM set to volts between the positive battery cable (1) at the starter motor and a known ground (2).

⇒	If voltage varies more than 1 volt from the battery voltage check circuit for open/high resistance or short to ground.




11. Connect a DMM set to volts between Starter motor solenoid supply cable (1) and a known ground (2)
12. Turn key to crank position. If voltage is more than 1 volt from the battery voltage, check circuit for open/high resistance or short to ground.
13. If voltage is within range replace starter motor.

Starter Motor Replacement.