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Possible Causes MECHANICAL CONDITION BATTERY CIRCUIT RESISTANCE TOO HIGH FUSED IGNITION SWITCH OUTPUT CIRCUITS FUSED B+ CIRCUIT OPEN (T752) STARTER RELAY CONTROL CIRCUIT OPEN (T750) STARTER RELAY OUTPUT CIRCUIT OPEN TRANSMISSION RANGE SENSOR STARTER RELAY STARTER Diagnostic Test 1. MECHANICAL CONDITION NOTE: Verify the battery is fully charged and capable of passing a load test before continuing. WARNING: Make sure the battery is disconnected, then wait two minutes before proceeding. Failure to do Is the engine able to turn over? Yes >> Go To 2 No >> Repair the mechanical condition preventing the starter motor from cranking. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 2. EXCESSIVE RESISTANCE IN THE BATTERY CIRCUIT Turn 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? Yes >> Repair the excessive resistance in the Battery circuit. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) No >> Go To 3 3. STARTER RELAY Turn ignition off. Remove the Starter Relay from IPM. CAUTION: The Parking Brake must be on and the Transmission must be in park for a vehicle equipped with WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands Did the Starter Motor crank the engine? Yes >> Go To 4 No >> Go To 6 9 - 1024 ENGINE ELECTRICAL DIAGNOSTICS LX |