Diagnostic Instructions
Reference Information
Schematic Reference
Starting and Charging Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
Starting System Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Verify that battery is sufficiently charged and that the battery cables are clean and tight.
- Turn the ignition switch to the start position. The starter solenoid should click.
- Remove the drive belt, refer to
Drive Belt Replacement for the 6.6 L engine,
Drive Belt Replacement for the 7.2 L engine,
Drive Belt Replacement for the 7.8 L engine,
Drive Belt Replacement for the 8.1 L
engine.
- Turn the ignition switch to the START position.
⇒ | If the engine cranks, inspect the engine and belt drive system for mechanical binding, seized engine, or seized generator, etc. |
- Using a DMM, measure between the positive battery cable and terminal B at the solenoid as the ignition switch is turned to the START position. Voltage should be less than 0.5 volts.
⇒ | If greater than the specified value, replace the positive battery cable. |
- Using a DMM, measure the negative battery cable to the starter motor case as the ignition switch is turned to the START position. Voltage should be less than 0.5 volts.
⇒ | If greater than the specified value, replace the negative battery cable. |
- If all circuits test normal, replace the starter motor.
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic procedure.