Starter Solenoid Clicks, Engine Does Not Crank
Starter Solenoid Clicks, Engine Does Not Crank
Diagnostic Instructions
* Perform theDiagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* ReviewStrategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.
Circuit/System Description
When the ignition switch is placed in the START position, a discrete signal is supplied to the body control module (BCM) notifying it that the ignition is in the START position. The BCM then sends a serial data message to the engine control module (ECM) that crank has been requested. The ECM monitors the park/neutral position switch and the clutch pedal position sensor. If the transmission is in Park or Neutral, or the clutch pedal is pressed, and there are no DTCs that inhibit engine starting, then the ECM supplies voltage to the control circuit of the STRTR relay. When this occurs, battery voltage is supplied through the STRTR relay to the X2-S terminal of the starter solenoid. The starter solenoid energizes, and supplies battery voltage to the starter from the B terminal to crank the engine.
Reference Information
Schematic Reference
Starting and Charging Schematics (Starting and Charging Schematics)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Starting System Description and Operation (Description and Operation)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
Circuit/System Verification
1. Attempt to start the engine. Verify that the starter solenoid clicks.
• If the starter solenoid does not click, refer toStarter Solenoid Does Not Click (Starter Solenoid Does Not Click) .
• If the engine cranks slowly, refer toEngine Cranks Slowly (Engine Cranks Slowly) .
2. Go to Circuit/System Testing.
Circuit/System Testing
1. Verify that the battery is sufficiently charged and that the battery cables are clean and tight. Refer to Charging System Test (Charging System Test) .
• If the battery is not sufficiently charged, refer toBattery Charging (Battery Charging) .
• If the battery cables are not clean and tight, refer toFastener Tightening Specifications (Specifications) .
2. Using a DMM, measure voltage between the positive battery terminal and X1 terminal B at the solenoid as the ignition switch is turned to the START position. Voltage should be less than 0.5 volt.
• If greater than the specified value, replace the starter solenoid cable.
3. Using a DMM, measure voltage between the negative battery terminal and the starter motor case as the ignition switch is turned to the START position. Voltage should be less than 0.5 volt.
• If greater than the specified value, replace the negative battery cable.
4. Remove the drive belt(s). Refer to one of the following:
* Drive Belt Replacement (Drive Belt Replacement) for the 4.3L (LU3) engine
* Drive Belt Replacement (Drive Belt Replacement) for the 6.6L Diesel (LMM) engine
* Drive Belt Replacement - Accessory (Drive Belt Replacement - Accessory) for all other engines (w/o LU3 or LMM)
* Air Conditioning Compressor Belt Replacement (V8) (Air Conditioning Compressor Belt Replacement) for all other engines (w/o LU3 or LMM)
5. Attempt to start the engine, with the drive belt(s) removed.
• If the engine cranks, inspect the engine accessories and belt drive system for mechanical binding.
6. Attempt to rotate the crankshaft using a breaker bar, or other suitable tool. Verify that the engine is not seized.
• If the engine is seized, refer to one of the following:
* Engine Will Not Crank - Crankshaft Will Not Rotate (Engine Will Not Crank - Crankshaft Will Not Rotate) for the 4.3L (LU3) engine
* Engine Will Not Crank - Crankshaft Will Not Rotate (Engine Will Not Crank - Crankshaft Will Not Rotate) for the 6.6L Diesel (LMM) engine
* Engine Will Not Crank - Crankshaft Will Not Rotate (Engine Will Not Crank - Crankshaft Will Not Rotate) for all other engines (w/o LU3 or LMM)
7. If all circuits test normal, replace the starter motor, or the starter solenoid (LMM 6.6L Diesel).
Repair Instructions
Perform theDiagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Battery Charging (Battery Charging)
* Starter Solenoid Cable Replacement (With LU3) (Service and Repair)Starter Solenoid Cable Replacement (With V8 Engine) (Service and Repair)Starter Solenoid Cable Replacement (With LMM) (Service and Repair)Starter Solenoid Cable Replacement (With L9H and TP2) (Service and Repair)
* Battery Negative Cable Replacement (With LU3) (Service and Repair)Battery Negative Cable Replacement (With V8 Engine) (Service and Repair)Battery Negative Cable Replacement (With LMM) (Service and Repair)
* Starter Solenoid Switch Replacement (6.6L) (Service and Repair) (LMM 6.6L Diesel)
* Starter Replacement (4.8L, 5.3L, 6.0L, and 6.2L) (Service and Repair)Starter Replacement (4.3L) (Service and Repair)Starter Replacement (6.6L) (Service and Repair)