For a complete wiring diagram Refer to Section 8W.Possible CausesMECHANICAL CONDITIONFUSED B+ CIRCUITS OPENBATTERY CIRCUIT RESISTANCE TOO HIGH(T752) STARTER RELAY CONTROL CIRCUIT SHORTED TO GROUND(T752) STARTER RELAY CONTROL CIRCUIT OPEN(T750) STARTER RELAY OUTPUT CIRCUIT SHORTED TO GROUND(T750) STARTER RELAY OUTPUT CIRCUIT OPENTRANSMISSION RANGE SENSORTIPMPCMSTARTER1. MECHANICAL CONDITIONVerify the battery is fully charged and capable of passing a load test before continuing.Make sure the battery is disconnected, then wait two minutes before proceeding. Failure to do so may result in personal injury or possible death.Turn the engine over by hand to make sure the engine is not seized.Is the engine able to turn over?YesGo To 2NoRepair the mechanical condition preventing the starter motor from cranking.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)2. PCM FUSED B+ CIRCUITS

Turn the ignition off.Disconnect the C1 PCM harness connector.Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.Using a 12-volt test light connected to ground, probe the Fused B+ circuits at the appropriate terminals of special too #8815.Does the test light illuminate brightly?YesGo To 3NoRepair the open or short to ground in the PCM Fused B+ circuits.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)3. TRANSMISSION RANGE SENSOR

Turn the ignition off.Disconnect the TRS harness connectors.Move the Gear selector through all gear positions, from Park to 1st and back.While moving the gear selector through each gear, measure the resistance between ground and the TRS (T41) Sense (P/N Sense) circuit at the TRS connector.The circuit is grounded in Park and Neutral and open in the other positions.Did the resistance change from above 100 kohms (open) to below 10.0 ohms (grounded) ?YesGo To 4NoReplace the Transmission Range Sensor.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)4. EXCESSIVE RESISTANCE IN THE BATTERY CIRCUITTurn the ignition off.Check the Battery Cables for excessive resistance using the service information procedure.Did either Battery Cable have a voltage drop greater than 0.2 of a volt?YesRepair the excessive resistance in the Battery circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To 55. STARTER

The Parking Brake must be on and the Transmission must be in park for a vehicle equipped with an automatic transmission.When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death. Turn ignition off.Disconnect the Starter Solenoid harness connector.The Stater Solenoid harness connector must remain disconnected at this time.Have an assistant turn the ignition key to the CRANK position.Using a 12-volt test light connected ground, probe the (T750) Stater Relay Output circuit in the Starter Solenoid harness connector while the ignition key is in the CRANK position.Does the test light illuminate brightly?YesReplace the Starter per Service Information.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To 66. (T752) STARTER RELAY CONTROL CIRCUIT CHECK

Turn the ignition off.Disconnect the C2 TIPM harness connector.Use a 12-volt test light connected to ground and probe the (T752) Starter Relay Control circuit in the C2 TIPM harness connector.When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death.Have an assistant turn the key to the CRANK position.Does the test light illuminate brightly when the key is turned to the crank condition?YesGo To 7NoRepair the excessive resistance or short to ground in the (T752) Starter Relay Control circuit between the PCM and TIPM.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 7. (T750) STARTER CONTROL OUTPUT CIRCUIT OPEN

Disconnect the Starter Solenoid connector.Measure the resistance of the (T750) Starter Control Output circuit between the Starter Solenoid harness connector and the C2 TIPM harness connector.Is the resistance below 5.0 ohms?YesGo To 8NoRepair the open in the (T750) Starter Control Output circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)8. (T750) STARTER RELAY OUTPUT CIRCUIT SHORTED TO GROUND

Measure the resistance between ground and the (T750) Starter Relay Output circuit in the Starter Solenoid harness connector.Is the resistance below 100 ohms?YesRepair the short to ground in the (T750) Starter Relay Output circuit.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoGo To 9 9. TOTALLY INTEGRATED POWER MODULEBefore continuing, check the TIPM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.Were any problems found?YesRepair as necessary.Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) NoReplace the Totally Integrated Power Module in accordance with the Service Information.Perform the BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)