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Engine Cranks Slowly

Engine Cranks Slowly

Diagnostic Instructions


• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

• Review Strategy Based Diagnosis for an overview of the diagnostic approach.

• Diagnostic Procedure Instructions provides an overview of each diagnostic category.


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


• Circuit Testing

• Connector Repairs

• Testing for Intermittent Conditions and Poor Connections

• Wiring Repairs


Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification


1. Ignition OFF, measure and record the battery voltage at the battery terminals. The voltage should be between 12.0-15.0 V.

2. If not within the specified range, refer to Battery Charging .

3. Remove the drive belts. Refer to Drive Belt Tensioner Replacement , Drive Belt Idler Pulley Replacement or Drive Belt Replacement .

4. Set the S39 ignition switch to the RUN position.

5. If the engine cranks normal, inspect the engine and belt drive system for mechanical binding, seized engine, or seized generator, etc.

6. Test for less than 0.5 V between the positive battery cable and terminal A X2 at the M64 starter motor as the S39 ignition switch is placed to the START position.

7. If greater than the specified value, replace the positive battery cable.

8. Test for less than 0.5 V between the negative battery cable and the starter motor case as the S39 ignition switch is placed to the RUN position.

9. If greater than the specified value, replace the negative battery cable.

10. If all circuits test normal, replace the M64 starter motor.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• Battery Positive and Negative Cable Replacement (LAU) ; Battery Positive and Negative Cable Replacement (LF1)

• Starter Motor Replacement (LAU) ; Starter Motor Replacement (LF1) .