System Diagnosis

Before removing any unit in a cranking circuit repair, perform the diagnostic procedures recommended. Then check the following items:

Battery:Determine condition of battery.

Wiring:Inspect wiring for damage. Inspect all connections to starter motor, solenoid switch, ignition switch, and battery, including all ground connections. Clean and tighten all connections as required.

Ignition Switch and Control Circuits:Inspect all switches and relays to determine condition.

Non-Cranking or Slow Cranking:If engine does not crank, or cranks slowly, follow diagnostic procedure. If faulty starter motor is diagnosed, replace starter motor.

Starter Motor Noise:Correct starter motor noise using the following information:
1. Shims are not installed during the vehicle assembly. However if the complaint is similar to the problems listed below correct as stated:
- A high pitched "whine" during cranking but engine cranks and fires, add one 0.38 mm (0.015 inch) single shim (13) to outer bolt/screw only.
- A high-pitched "whine" after engine fires, add 0.38 mm (0.015 inch) double shims (14) until noise disappears. Number of shims should not exceed 1.14 mm (0.045 inch).
- A loud "whoop" after the engine fires but while the starter drive pinion is still engaged. Replace the starter drive.
- A "rumble" or "growl" or in severe cases a "knock" as the starter motor is coasting down to a stop after starting the engine. Most probable cause is a bent or unbalanced starter armature.
Starter Motor: If battery, wiring and switches are in satisfactory condition, engine is functioning properly, and problem has been traced to starter motor, replace starter motor.

NOTICE: Never operate the starter motor for more than 30 seconds at a time without pausing to allow it to cool for at least two minutes. Overheating, caused by excessive cranking, will seriously damage the starter motor.