Engine Cranks Slowly
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
- Ignition OFF, measure and record the battery voltage at the battery terminals. The voltage should be between 12.0-15.0 V.
- Remove the drive belts. Refer to the link list below.
- Place the S39 Ignition Switch to the CRANK position.
⇒ | If the engine cranks normal, inspect the engine and belt drive system for mechanical binding, seized engine, or seized generator, etc. |
- 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 set to the CRANK position.
⇒ | If greater than the specified value, replace the positive battery cable. |
- 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 CRANK position.
⇒ | If greater than the specified value, replace the negative battery cable. |
- If all circuits test normal, replace the M64 Starter Motor.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
© Copyright Chevrolet. All rights reserved |