Starting and Charging: Testing and Inspection

Engine Cranks Slowly

Diagnostic Instructions

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

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

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

Reference Information

Schematic Reference

Starting and Charging Schematics [1][2]Electrical Diagrams

Connector End View Reference

Component Connector End Views Sunshade - Left Front

Description and Operation

Starting System Description and Operation Description and Operation

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Verification

1. Ignition OFF, measure and record the battery voltage at the C1 battery terminals. The voltage should be between 12.0-15.0 V.

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

2. Remove the drive belts. Refer to Drive Belt Tensioner Replacement Service and Repair , Drive Belt Replacement Service and Repair for the LAF engine, Drive Belt Tensioner Replacement Service and Repair , or Drive Belt Replacement Service and Repair for the LFW engine.

3. Place the ignition to the CRANK position. verify the engine does not crank normal.

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

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

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

5. Test for less than 0.5 V between the negative battery cable and the M64 starter motor case as the ignition switch is placed to the CRANK position.

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

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

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

* Battery Positive Cable Replacement (LFX) Service and RepairBattery Positive Cable Replacement (LEA) Service and Repair

* Battery Negative Cable Replacement (LFX) Battery Negative Cable ReplacementBattery Negative Cable Replacement (LEA) Battery Negative Cable Replacement

* Starter Replacement (LFX) Service and RepairStarter Replacement (LEA) Service and Repair