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Range Selector Lever Cable Adjustment (MYC 6L80E, MYD 6L90E) Range Selector Lever Cable Adjustment (MW7 Allison) Park/Neutral Position Switch Adjustment (M30 4L60E, M70 4L70E) Relay Replacement (Attached to Wire Harness) or Relay Replacement (Within an Starter Solenoid Cable Replacement (4.3L) or Starter Solenoid Cable Replacement Clutch Pedal Engine Start Switch Replacement (TZ0 Manual) Park/Neutral Position Switch Replacement (M30 4L60E, M70 4L70E) Control Valve Body Assembly Removal for shift shaft position switch replacement Control Valve Body Assembly Disassemble for shift shaft position switch replacement Transmission Internal Mode Switch Replacement (MW7 Allison) Starter Motor Solenoid Replacement (6.6L) 6.6L Diesel (LMM) Starter Motor Replacement (4.3L) or Starter Motor Replacement (4.8L, 5.3L, 6.0L, Control Module References for BCM or ECM replacement, setup and programming STARTER SOLENOID CLICKS, ENGINE DOES NOT CRANK 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. Circuit/System Description When the ignition switch is placed in the START position, a discrete signal is supplied to the
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Electrical - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
terminal of the starter solenoid. The starter solenoid energizes, and supplies battery voltage to the 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 Circuit/System Verification 1. Attempt to start the engine. Verify that the starter solenoid clicks. If the starter solenoid does not click, refer to Starter Solenoid Does Not Click. If the engine cranks slowly, refer to 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. If the battery is not sufficiently charged, refer to Battery Charging. If the battery cables are not clean and tight, refer to Fastener Tightening 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
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Electrical - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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 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 for the 4.3L (LU3) engine Drive Belt Replacement for the 6.6L Diesel (LMM) engine Drive Belt Replacement - Accessory for all other engines (w/o LU3 or LMM) Air Conditioning Compressor Belt Replacement for all other engines (w/o LU3 or 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 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 for the 4.3L (LU3) Engine Will Not Crank - Crankshaft Will Not Rotate for the 6.6L Diesel Engine Will Not Crank - Crankshaft Will Not Rotate for all other engines 7. If all circuits test normal, replace the starter motor, or the starter solenoid (LMM 6.6L Diesel). Repair Procedures Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Battery Charging Starter Solenoid Cable Replacement (4.3L) or Starter Solenoid Cable Replacement Battery Negative Cable Replacement (4.3L) or Battery Negative Cable Replacement
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Electrical - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
(4.8L, 5.3L, 6.0L, and 6.2L) or Battery Negative Cable Replacement (6.6L) Starter Motor Solenoid Replacement (6.6L) (LMM 6.6L Diesel) Starter Motor Replacement (4.3L) or Starter Motor Replacement (4.8L, 5.3L, 6.0L, ENGINE CRANKS SLOWLY Perform the following checks: Battery-Battery Inspection/Test. Refer to Battery Inspection/Test. Wiring-Inspect the wiring for damage. Inspect all connections to the starter motor, solenoid, Engine-Make sure the engine is not seized. Refer to Symptoms - Engine Mechanical . If the battery, the wiring and the engine are functioning properly and the engine continues to STARTER MOTOR NOISE DIAGNOSIS 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. Circuit/System Description The PG starter motors are non-repairable. They have pole pieces that are arranged around the Reference Information Description and Operation
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Electrical - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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