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Starting System Chevrolet Impala VIII

Starter 7 illustrations ~5364 words

TORQUE SPECIFICATIONS

ApplicationFt. Lbs. (N.m)
Battery Negative Terminal Bolt11 (15)
Radiator Lower Air Deflector Bolts15 (20)
Starter Mounting Bolts32 (43)
INCH Lbs. (N.m)
Solenoid BAT Terminal Nut89 (10)
Starter Solenoid S Terminal Nut21 (2)
Torque Converter Cover Bolts89 (10)

TORQUE SPECIFICATIONS

STARTER MOTOR SPECIFICATIONS

ApplicationModel
LA1PG260D
L36PG260F2

STARTER MOTOR SPECIFICATIONS

WIRING DIAGRAMS

For starter motor wiring diagrams, see STARTING/CHARGING .

Scheme 1

Scheme 1: COMPONENT LOCATIONS
Scheme 1: COMPONENT LOCATIONS

Scheme 2

Scheme 2
Scheme 2

DIAGNOSTIC STARTING POINT - ENGINE ELECTRICAL

Begin the system diagnosis with the DIAGNOSTIC SYSTEM CHECK - ENGINE ELECTRICAL . The Diagnostic System Check will provide the following information

  1. The identification of the control modules which command the system.
  2. The ability of the control modules to communicate through the serial data circuit.
  3. The identification of any stored diagnostic trouble codes (DTCs) and their status.

The use of the Diagnostic System Check will identify the correct procedure for diagnosing the system and where the procedure is located.

DIAGNOSTIC SYSTEM CHECK - ENGINE ELECTRICAL

  1. Perform the Battery Inspection/Test. See «BATTERY TESTING & INSPECTION»(/chevrolet/impala/viii-1999-2006/remont/charging-system/#charging-system__battery-testing-inspection) . Does the battery pass the test? If so, go to next step.
  2. Install a scan tool. Turn ON the ignition, with the engine OFF. Does the scan tool power up? If so, go to next step. If not, go to «TEST D: SCAN TOOL DOES NOT POWER UP»(/chevrolet/impala/viii-1999-2006/remont/communication-devices/#body-control-modules__test-d-scan-tool-does-not) in BODY CONTROL MODULES article under ACCESSORIES & EQUIPMENT. NOTE: The engine may start during the following step. Turn OFF the engine as soon as you have observed the Crank power mode.
  3. Access the CLASS 2 POWER MODE in the Diagnostic Circuit Check on the scan tool. Rotate the ignition switch through all positions while observing the Class 2 Power Mode parameter. Does the ignition switch parameter reading match the ignition switch position for all switch positions? If so, go to next step. If not, go to «TEST E: POWER MODE MISMATCH»(/chevrolet/impala/viii-1999-2006/remont/communication-devices/#body-control-modules) . NOTE: Lack of communication may be because of a partial malfunction of the class 2 serial data circuit or due to a total malfunction of the class 2 serial data circuit. The specified procedure will determine the particular condition.
  4. Turn ON the ignition, with the engine OFF. Attempt to communicate with each of the following modules on the class 2 serial data circuit: Body Control Module (BCM) Instrument Panel Cluster (IPC) Powertrain Control Module (PCM) Does the scan tool communicate with all modules on the class 2 serial data circuit? If so, go to next step. If not, go to «TEST C: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/chevrolet/impala/viii-1999-2006/remont/communication-devices/#body-control-modules) in BODY CONTROL MODULES article under ACCESSORIES & EQUIPMENT. NOTE: The symptom list in Symptoms will determine the correct diagnostic procedure to use.
  5. Select the DISPLAY DTCS function for each module. If using a Tech 2, use the CLASS 2 DTC CHECK feature in order to determine which modules have DTCs set. Record all of the displayed DTCs, the DTC status, and the module which set the DTC. Does the scan tool display any DTCs? If so, go to next step. If not, go to «SYMPTOMS - ENGINE ELECTRICAL»(/chevrolet/impala/viii-1999-2006/remont/starter/#starting-system__symptoms-engine-electrical) . NOTE: The presence of DTCs which begin with "U" indicate some other module is not communicating. The specified procedure will collect all the available information before you perform tests.
  6. Does the scan tool display any DTCs which begin with a "U"? If so, go to «TEST C: SCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICE»(/chevrolet/impala/viii-1999-2006/remont/communication-devices/#body-control-modules) in BODY CONTROL MODULES article under ACCESSORIES & EQUIPMENT. If not, go to next step.
  7. Does the scan tool display DTC B1000, B2947, B2948, B2957, B2058, B2960, B3031, or B3032? If so, go to «BODY CONTROL MODULES»(/chevrolet/impala/viii-1999-2006/remont/communication-devices/#body-control-modules) . If not, go to «DIAGNOSTIC TROUBLE CODE DEFINITIONS»(/chevrolet/impala/viii-1999-2006/remont/starter/#starting-system__diagnostic-trouble-code-definitions) .

DIAGNOSTIC TROUBLE CODE DEFINITIONS

DTCDefinition
DTC B1327Voltage Falls Below Expected Range
DTC B1507Voltage Falls Between Specified Range
DTC B1508Voltage Falls Between Specified Range
DTC P0560System Voltage Outside Of Expected Range

DIAGNOSTIC TROUBLE CODE DEFINITIONS

Circuit Description

The body control module (BCM) and Onstar Module (ONS) monitor the battery voltage to determine if it is between 9.0-15.9 volts.

Conditions for Running the DTC

This DTC shall run only if the BCM and ONS have power, ground and the ignition in not in START mode. This DTC shall execute regardless of the battery voltage, except when the DTC B1390 is set current.

Conditions for Setting the DTC

  1. This DTC shall be set as current when the voltage falls below 9.0 volts for 1200 milliseconds.
  2. When the vehicle exits START the BCM and ONS shall delay checking the voltage for 2 seconds.

Action Taken When the DTC Sets

A message shall be sent out on the class 2 lines to illuminate the charge indicator lamp.

Conditions for Clearing the MIL/DTC

In order to clear the DTC from a current status the voltage shall be greater than 9.54 volts for 1200 milliseconds.

Testing

  1. Did you perform the DIAGNOSTIC SYSTEM CHECK - ENGINE ELECTRICAL? If so, go to next step. If not, go to «DIAGNOSTIC SYSTEM CHECK - ENGINE ELECTRICAL»(/chevrolet/impala/viii-1999-2006/remont/starter/#starting-system__diagnostic-system-check-engine-electrical) .
  2. Install a scan tool. Turn ON the ignition, with the engine OFF. With a scan tool, observe the ELECTRONIC BATTERY FD parameter in the BCM data list. Does the scan tool indicate the battery voltage is greater than the specified value of 9.0V? If so, go to step 8 . If not, go to next step.
  3. Measure the voltage across the battery terminals. Compare the battery voltage with the Electronic Battery FD parameter in the BCM data list. Are the voltages within the specified value of 1.0V? If so, go to step 8 . If not, go to next step.
  4. Turn OFF the ignition. Disconnect the harness connector of the module setting DTC B1327. Turn ON the ignition, with the engine OFF. Measure the voltage between the battery positive voltage circuit of the module setting the DTC B1327 and the ground circuit of the module setting the DTC B1327. Does the voltage measure greater than the specified value of 9.0V? If so, go to step 8 . If not, go to next step.
  5. Measure the voltage between the battery positive voltage circuit of the module setting the DTC B1327 and a good ground. Does the voltage measure greater than the specified value of 9.0V? If so, go to next step. If not, go to step 7 .
  6. Test the ground circuit of the module setting the code for a high resistance or an open. Did you find and correct the condition? If so, go to step 10 . If not, go to step 8 .
  7. Test the battery positive voltage circuit of the module setting the code for a high resistance or an open. Did you find and correct the condition? If so, go to step 10 . If not, go to next step.
  8. Inspect for poor connections at the harness connector of the module setting the code. Did you find and correct the condition? If so, go to next step.
  9. Replace the module setting the code. Did you complete the replacement? If so, go to next step.
  10. Use the scan tool in order to clear the DTCs. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text. See «CONDITIONS FOR RUNNING THE DTC»(/chevrolet/impala/viii-1999-2006/remont/starter/#starting-system__conditions-for-running-the-dtc) . Does the DTC reset? If so, go to step 2 . If not, then system is okay.

The BCM monitors the load control circuit for shorts to ground and shorts to voltage. The circuit starts at the BCM and travels to the IP fuse panel where the circuit splits to supply power for the heated seat switch and HVAC control head for the rear defog relay driver.

  1. This DTC shall run only if the Voltage to the BCM is between 9.0 and 16.0 volts.
  2. The ignition must be in the ON position.
  3. This DTC shall not set during BCM programing and configuration changes.
  4. This DTC shall not set if any communication codes are set.

The voltage of the load control circuit, at the module, shall be less than 2 volts for 1/2 second while the output is active.

The BCM sets a DTC and disables the following State of Health (SOH) DTCs

  1. DTC U1096
  2. DTC U1255
  3. DTC U1300
  4. DTC U1301

The BCM illuminates the SVS indicator.

  1. The voltage of the load control circuit at the module shall be greater than 2 volts for 1/2 second while the output is active.
  2. A history DTC clears after 100 malfunction free ignition cycles.
  3. The BCM receives the clear code command from the scan tool.
  1. Did you perform the DIAGNOSTIC SYSTEM CHECK - ENGINE ELECTRICAL? If so, go to next step. If not, go to «DIAGNOSTIC SYSTEM CHECK - ENGINE ELECTRICAL»(/chevrolet/impala/viii-1999-2006/remont/starter/#starting-system__diagnostic-system-check-engine-electrical) .
  2. Install a scan tool. Turn ON the ignition, with the engine OFF. With a scan tool, monitor the DTC INFORMATION for DTC B1507 in the BCM. Does the scan tool indicate that DTC B1507 is current? If so, go to next step. If not, go to «INTERMITTENTS»(/chevrolet/impala/viii-1999-2006/remont/starter/#starting-system__intermittents) .
  3. Test the load control circuit of the BCM for a short to ground. Did you find and correct the condition? If so, go to step 6 . If not, go to next step.
  4. Inspect for poor connections at the harness connector of the BCM. Did you find and correct the condition? If so, go to step 6 . If not, go to next step.
  5. Replace the BCM. See appropriate «BODY CONTROL MODULES»(/chevrolet/impala/viii-1999-2006/remont/communication-devices/#body-control-modules) . After replacement is complete, go to next step.
  6. Use the scan tool in order to clear the DTCs. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text. See «CONDITIONS FOR RUNNING THE DTC»(/chevrolet/impala/viii-1999-2006/remont/starter/#starting-system) . Does the DTC reset? If so, go to step 2 . If not, then system is okay.

The BCM monitors the load control circuit for shorts to ground and shorts to voltage. The circuit starts at the BCM and travels to the IP fuse panel where the circuit splits to supply power for the heated seat switch and HVAC control head for the rear defog relay driver.

  1. The Voltage to the BCM must be between 9.0 and 16.0 volts.
  2. The ignition must be in the ON position.
  3. The Load Shed system must be active.
  4. This DTC shall not set during BCM programing and configuration changes.
  5. This DTC shall not set if any communication codes are set.

The voltage of the load control circuit, at the module, shall be greater than 8 volts for 1/2 second while the output is inactive.

The BCM sets a DTC and disables the following State of Health (SOH) DTCs

  1. DTC U1096
  2. DTC U1255
  3. DTC U1300
  4. DTC U1301

The BCM illuminates the SVS indicator.

  1. The Load Shed system in not in an active state.
  2. The voltage of the load control circuit at the module shall be less than 8 volts for 1/2 second while the output is inactive.
  3. A history DTC clears after 100 malfunction free ignition cycles.
  4. The BCM receives the clear code command from the scan tool.
  1. Did you perform the DIAGNOSTIC SYSTEM CHECK - ENGINE ELECTRICAL? If so, go to next step. If not, go to «DIAGNOSTIC SYSTEM CHECK - ENGINE ELECTRICAL»(/chevrolet/impala/viii-1999-2006/remont/starter/#starting-system__diagnostic-system-check-engine-electrical) .
  2. Install a scan tool. Turn ON the ignition, with the engine OFF. With a scan tool, monitor the DTC INFORMATION for DTC B1508 in the BCM. Does the scan tool indicate that DTC B1508 is current? If so, go to next step. If not, go to «INTERMITTENTS»(/chevrolet/impala/viii-1999-2006/remont/starter/#starting-system__intermittents) .
  3. Test the load control circuit of the BCM for a short to voltage. Did you find and correct the condition? If so, go to step 6 . If not, go to next step.
  4. Inspect for poor connections at the harness connector of the BCM. Did you find and correct the condition? If so, go to step 6 . If not, go to next step.
  5. Replace the BCM. See «BODY CONTROL MODULES»(/chevrolet/impala/viii-1999-2006/remont/communication-devices/#body-control-modules) . After replacement, go to next step.
  6. Use the scan tool in order to clear the DTCs. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text. See «CONDITIONS FOR RUNNING THE DTC»(/chevrolet/impala/viii-1999-2006/remont/starter/#starting-system) . Does the DTC reset? If so, go to step 2 . If not, then system is okay.

The PCM monitors the system voltage to make sure that the voltage stays within the proper range. Damage to components, and incorrect data input can occur when the voltage is out of range. The PCM monitors the system voltage over an extended length of time. If the PCM detects a system voltage outside an expected range for the calibrated length of time, DTC P0560 will set.

  1. System voltage below 11 volts.
  2. Engine speed above 1500 RPM.
  3. Vehicle speed below 25 mph (40 kph).

The PCM detects a system voltage out of range for 2 seconds.

  1. The PCM will not illuminate the Malfunction Indicator Lamp (MIL).
  2. The PCM will command a message to be displayed.
  3. The PCM will store conditions which were present when the DTC set as Fail Records data only.

Conditions for Clearing the DTC

  1. The PCM will command the message OFF after one trip in which the diagnostic test has been run and passed.
  2. The history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
  3. The DTC can be cleared by using the scan tool Clear DTC Information function.
  1. Did you perform the DIAGNOSTIC SYSTEM CHECK - ENGINE ELECTRICAL? If so, go to next step. If not, go to «DIAGNOSTIC SYSTEM CHECK - ENGINE ELECTRICAL»(/chevrolet/impala/viii-1999-2006/remont/starter/#starting-system__diagnostic-system-check-engine-electrical) .
  2. Install a scan tool. Turn ON the ignition, with the engine OFF. With a scan tool, observe the IGNITION 1 SIGNAL parameter in the PCM data list. Does the scan tool indicate that the Ignition 1 Signal parameter is greater than the specified range of 11.0V? If so, go to step 6 . If not, go to next step.
  3. Using a scan tool compare the BATTERY VOLTAGE parameter in the DIM data list with the IGNITION 1 SIGNAL parameter in the PCM data list. Are the DIM Battery Voltage and PCM Ignition 1 readings different by more than the value specified of 0.5V? If so, go to next step. If not, go to «TEST A: CHARGING SYSTEM TEST»(/chevrolet/impala/viii-1999-2006/remont/charging-system/#charging-system) .
  4. Test the battery positive voltage circuit of the PCM for a high resistance. Did you find and correct the condition? If so, go to step 7 . If not, go to next step.
  5. Inspect for poor connections at the harness connector of the PCM. Did you find and correct the condition? If so, go to step 7 . If not, go to next step.
  6. Replace the PCM. See «POWERTRAIN CONTROL MODULE»(/chevrolet/impala/viii-1999-2006/remont/removal-installation/#how-to-overhaul-the-engine-controls-removal-installation__powertrain-control-module) . After replacement is complete, go to next step.
  7. Review and record the scan tool Fail Records data. Use the scan tool in order to clear the DTC(s). Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text. See «CONDITIONS FOR RUNNING THE DTC»(/chevrolet/impala/viii-1999-2006/remont/starter/#starting-system) . Using the scan tool, observe the SPECIFIC DTC INFORMATION for DTC P0560 until the test runs. Does the scan tool indicate that DTC P0560 failed this ignition? If so, go to step 2 . If not, then system is okay.

SYMPTOMS - ENGINE ELECTRICAL

The following steps must be completed before using the symptom tables.

  1. Perform «DIAGNOSTIC SYSTEM CHECK - ENGINE ELECTRICAL»(/chevrolet/impala/viii-1999-2006/remont/starter/#starting-system__diagnostic-system-check-engine-electrical) before using the Symptom Tables in order to verify that all of the following are true: There are no DTCs set. The control modules can communicate via the serial data link.
  2. Review the system descriptions and operations in order to familiarize yourself with the system functions. See «DESCRIPTION & OPERATION»(/chevrolet/impala/viii-1999-2006/remont/starter/#starting-system) .

Visual/Physical Inspection

  1. Inspect for aftermarket devices which could affect the operation of the Starting and Charging Systems.
  2. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.

Intermittents

Intermittent faulty electrical connections or wiring may be the cause of intermittent conditions. Check for loose, bent or corroded terminals and terminal tension. Check for cut, bare or pinched wiring. Simulate the condition that is potentially causing the intermittent connection, either by wiggling the connections or the wiring, test driving or performing other operations while observing scan tool, DVOM or other testing equipment.

Symptom List

  1. Starter Solenoid Does Not Click
  2. Starter Solenoid Clicks, Engine Does Not Crank
  3. Engine Cranks Slowly
  4. Starter Motor Noise Diagnosis

STARTER SOLENOID DOES NOT CLICK

  1. Did you perform the DIAGNOSTIC SYSTEM CHECK - ENGINE ELECTRICAL? If so, go to next step. If not, go to «DIAGNOSTIC SYSTEM CHECK - ENGINE ELECTRICAL»(/chevrolet/impala/viii-1999-2006/remont/starter/#starting-system__diagnostic-system-check-engine-electrical) .
  2. Turn the ignition switch to the START position. Does the engine crank? If so, go to «INTERMITTENTS»(/chevrolet/impala/viii-1999-2006/remont/starter/#starting-system__intermittents) . If not, go to next step.
  3. Install a scan tool. Turn the ignition ON, with the engine OFF. With a scan tool, observe the STARTER RELAY COMMAND parameter in the PCM data list. Turn the ignition switch to the START position. Does the scan tool display ENABLED? If so, go to next step. If not, go to step 12 .
  4. Turn the ignition switch to the START position. Do you hear the Starter relay click? If so, go to step 7 . If not, go to next step.
  5. Turn OFF the ignition. Disconnect the Starter relay. Turn ON the ignition, with the engine OFF. Connect a test light between the battery positive voltage circuit of the Starter relay coil and a good ground. Does the test light illuminate? If so, go to next step. If not, go to step 18 .
  6. Connect a test light between the battery positive voltage circuit of the Starter relay coil and the control circuit of the Starter relay. Turn the ignition to the START position. Does the test light illuminate? If so, go to step 13 . If not, go to step 11 .
  7. Turn OFF the ignition. Disconnect the Starter relay. Connect a test light between the battery positive voltage circuit of the Starter relay switch circuit and a good ground. Does the test light illuminate? If so, go to next step. If not, go to step 19 .
  8. Connect a 30 amp fused jumper between the battery positive voltage circuit of the Starter relay switch circuit and the supply voltage circuit of the starter solenoid. Does the engine crank? If so, go to step 13 . If not, go to next step.
  9. Did the fuse in the jumper open? If so, go to step 20 . If not, go to next step.
  10. Disconnect the supply voltage circuit of the starter solenoid. Connect a test light between the supply voltage circuit of the starter solenoid and a good ground. Does the test light illuminate? If so, go to step 14 . If not, go to step 21 .
  11. Test the control circuit of the Starter relay for an open or a short to battery voltage. Did you find and correct the condition? If so, go to step 26 . If not, go to step 17 .
  12. Test the crank request input circuit of the PCM for an open or a short to ground. Did you find and correct the condition? If so, go to step 26 . If not, go to step 16 .
  13. Inspect for poor connections at the Starter relay. Did you find and correct the condition? If so, go to step 26 . If not, go to step 22 .
  14. Inspect for poor connections at the engine harness connector C112. Did you find and correct the condition? If so, go to step 26 . If not, go to next step.
  15. Inspect for poor connections at the starter solenoid. Did you find and correct the condition? If so, go to step 26 . If not, go to step 23 .
  16. Inspect for poor connections at the ignition switch. Did you find and correct the condition? If so, go to step 26 . If not, go to step 24 .
  17. Inspect for poor connections at the PCM harness connectors. Did you find and correct the condition? If so, go to step 26 . If not, go to step 25 .
  18. Repair an open or high resistance in the battery positive voltage circuit of the Starter relay coil. After repair is complete, go to step 26 .
  19. Repair an open or high resistance in the battery positive voltage circuit of the Starter relay switch. After repair is complete, go to step 26 .
  20. Repair a short to ground in the supply voltage circuit of the starter solenoid. After repair is complete, go to step 26 .
  21. Repair an open or high resistance in the supply voltage circuit of the starter solenoid. After repair is complete, go to step 26 .
  22. Replace the Starter relay. After repair is complete, go to step 26 .
  23. Replace the starter motor. See «STARTER MOTOR»(/chevrolet/impala/viii-1999-2006/remont/starter/#starting-system) . After repair is complete, go to step 26 .
  24. Replace the ignition switch. See «IGNITION SWITCH»(/chevrolet/impala/viii-1999-2006/remont/gauges-instrument-panels/#analog-instrument-panels) . After repair is complete, go to step 26 .
  25. Replace the PCM. See «POWERTRAIN CONTROL MODULE»(/chevrolet/impala/viii-1999-2006/remont/removal-installation/#how-to-overhaul-the-engine-controls-removal-installation__powertrain-control-module) . After replacement is complete, go to next step.
  26. Operate the system in order to verify the repair. Did you find and correct the condition? If so, then system is okay. If not, go to step 2 .

STARTER SOLENOID CLICKS, ENGINE DOES NOT CRANK

  1. Did you perform the DIAGNOSTIC SYSTEM CHECK - ENGINE ELECTRICAL? If so, go to next step. If not, go to «DIAGNOSTIC SYSTEM CHECK - ENGINE ELECTRICAL»(/chevrolet/impala/viii-1999-2006/remont/starter/#starting-system__diagnostic-system-check-engine-electrical) .
  2. Turn the ignition switch to the START position. Did the starter solenoid click one time? If so, go to next step. If not, go to «STARTER SOLENOID DOES NOT CLICK»(/chevrolet/impala/viii-1999-2006/remont/starter/#starting-system__starter-solenoid-does-not-click) .
  3. Inspect the engine and belt drive system for mechanical binding (seized engine, seized generator). Does the engine move freely? If so, go to next step. If not, go to «ENGINE WILL NOT CRANK - CRANKSHAFT WILL NOT ROTATE»(/chevrolet/impala/viii-1999-2006/remont/starter/#starting-system) .
  4. Test the battery positive cable between the battery and the Engine Harness Wiring Junction Block (TOP) for an open or high resistance. Did you find and correct the condition? If so, go to step 10 . If not, go to next step.
  5. Test the battery positive cable between the Engine Harness Wiring Junction Block (TOP) and the starter motor for an open or high resistance. Did you find and correct the condition? If so, go to step 10 . If not, go to next step.
  6. Test the ground of the starter motor between the battery and the starter motor for a high resistance. Did you find and correct the condition? If so, go to step 10 . If not, go to next step.
  7. Inspect for poor connections at the Engine Harness Wiring Junction Block (TOP). Did you find and correct the condition? If so, go to step 10 . If not, go to next step.
  8. Inspect for poor connections at the starter motor. Did you find and correct the condition? If so, go to step 10 . If not, go to next step.
  9. Replace the starter motor. See «STARTER MOTOR»(/chevrolet/impala/viii-1999-2006/remont/starter/#starting-system) . After replacement is complete, go to next step.
  10. Operate the system in order to verify the repair. Did you find and correct the condition? If so, then system is okay. If not, go to step 2 .

ENGINE CRANKS SLOWLY

Inspect the following items

  1. Perform the Battery Inspection/Test. See «BATTERY TESTING & INSPECTION»(/chevrolet/impala/viii-1999-2006/remont/charging-system/#charging-system__battery-testing-inspection) .
  2. Inspect the wiring for damage. Inspect all connections to the starter motor, the solenoid, the battery, and all ground connections.
  3. Verify that the engine is not seized.
  4. If the battery, the wiring, and the engine are functioning properly, and the engine continues to crank slowly, replace the starter motor. See «STARTER MOTOR»(/chevrolet/impala/viii-1999-2006/remont/starter/#starting-system) .

Diagnostic Aids

  1. Inspect the flywheel ring gear for damage or unusual wear.
  2. Shim the starter as required.
  3. In order to add pinion to ring gear clearance a full size shim must be used. Do not shim only one starter mounting bolt. There are three shims available in different shapes, for clearance, all are 0.039" (1 mm) thick.
  1. Did you perform the DIAGNOSTIC SYSTEM CHECK - ENGINE ELECTRICAL? If so, go to next step. If not, go to «DIAGNOSTIC SYSTEM CHECK - ENGINE ELECTRICAL»(/chevrolet/impala/viii-1999-2006/remont/starter/#starting-system__diagnostic-system-check-engine-electrical) .
  2. Start the engine. Does the starter operate normally? If so, go to «INTERMITTENTS»(/chevrolet/impala/viii-1999-2006/remont/starter/#starting-system__intermittents) . If not, go to next step.
  3. Start the engine while listening to the starter motor turn. Is there a loud "whoop", it may sound like a siren if the engine is revved while the starter is engaged, after the engine starts, but while the starter is still held in the engaged position? If so, go to step 6 . If not, go to next step.
  4. Do you hear a "rumble", a "growl", or, in some cases, a "knock" as the starter is coasting down to a stop after starting the engine? If so, go to step 7 . If not, go to next step.
  5. When the engine is cranked, do you hear a high-pitched whine after the engine cranks and starts normally? (This is often diagnosed as a starter drive gear hang-in or a weak solenoid.) If so, go to step 8 . If not, go to step 7 .
  6. Inspect the flywheel ring gear for chipped gear teeth, missing gear teeth and milled teeth. Is the flywheel bent, or does it have damaged teeth? If so, go to step 9 . If not, go to step 10 .
  7. Remove the starter motor. See «STARTER MOTOR»(/chevrolet/impala/viii-1999-2006/remont/starter/#starting-system) . Inspect the starter motor bushings and clutch gear. Does the clutch gear have chipped or milled teeth or worn bushings? If so, go to step 10 . If not, go to step 9 .
  8. Shim the starter motor away from the flywheel by adding shims between the starter motor and the engine block one at a time. Flywheel runout may make this noise appear to be intermittent. After repair is complete, go to step 11 .
  9. Replace the flywheel. See appropriate ENGINE MECHANICAL article under ENGINE. After replacement is complete, go to step 11 .
  10. Replace the starter motor. See «STARTER MOTOR»(/chevrolet/impala/viii-1999-2006/remont/starter/#starting-system) . After replacement is complete, go to next step.
  11. Operate the system in order to verify the repair. Did you correct the condition? If so, then system is okay. If not, go to step 2 .

Scheme 3

Scheme 3: ENGINE WILL NOT CRANK - CRANKSHAFT WILL NOT ROTATE
Scheme 3: ENGINE WILL NOT CRANK - CRANKSHAFT WILL NOT ROTATE

REPLACEMENT PROCEDURES

Note. Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

Removal (3.4L, LA1)

Note. The starter motor on this vehicle is NOT serviceable and must be replaced as a complete unit.

  1. Disconnect the negative battery cable. Raise and support the vehicle. Remove the lower air deflector. Remove the torque converter covers.
  2. Remove the starter solenoid BAT terminal nut and remove the positive battery cable from the starter motor. (Scheme 4) Remove the starter solenoid S terminal nut and remove the starter solenoid wire from the starter motor.
  3. Remove the starter bolts and remove the starter motor. (Scheme 2) Remove the shims, if necessary.

Scheme 4

Scheme 4
Scheme 4

Installation

  1. The 3.4L uses a PG260 F1 starter motor. Verify that the correct starter motor is being installed. (Scheme 5)
  2. Align the starter motor to the engine. Install any shims, if removed. Install the starter bolts finger tight until seated. Then, tighten the starter bolts to specifications. See «TORQUE SPECIFICATIONS»(/chevrolet/impala/viii-1999-2006/remont/starter/#starting-system__torque-specifications).
  3. Install the positive battery cable and install the solenoid BAT terminal nut finger tight to the starter motor. (Scheme 4) Install the starter solenoid wire and install the starter solenoid S terminal nut finger tight to the starter motor. Tighten the solenoid BAT terminal nut and the starter solenoid S terminal nut to specifications. See «TORQUE SPECIFICATIONS»(/chevrolet/impala/viii-1999-2006/remont/starter/#starting-system__torque-specifications).
  4. Install the torque converter covers. Tighten bolts to specifications. See «TORQUE SPECIFICATIONS»(/chevrolet/impala/viii-1999-2006/remont/starter/#starting-system__torque-specifications). Install the lower air deflector. Tighten bolts to specifications. See «TORQUE SPECIFICATIONS»(/chevrolet/impala/viii-1999-2006/remont/starter/#starting-system__torque-specifications). Lower the vehicle. Connect the negative battery cable. Tighten battery cable to specifications. See «TORQUE SPECIFICATIONS»(/chevrolet/impala/viii-1999-2006/remont/starter/#starting-system__torque-specifications).

Scheme 5

Scheme 5
Scheme 5

Removal (3.8L, L36)

Note. The starter motor on this vehicle is NOT serviceable and must be replaced as a complete unit.

  1. Disconnect the negative battery negative cable. Raise and support the vehicle. Remove the lower air deflector. Remove the torque converter covers.
  2. Remove the starter solenoid BAT terminal nut and remove the positive battery cable from the starter motor. (Scheme 6) Remove the starter solenoid S terminal nut and remove the starter solenoid wire from the starter motor.
  3. Remove the starter bolts and remove the starter motor. (Scheme 1) Remove the shims, if equipped.

Scheme 6

Scheme 6
Scheme 6
  1. The 3.8L uses a PG260 F2 starter motor. Verify the correct starter motor is being installed. (Scheme 7) Align the starter motor to the engine. (Scheme 1) Install any shims, if removed.
  2. Install the starter bolts finger tight until seated. Tighten the bolts to specifications. See «TORQUE SPECIFICATIONS»(/chevrolet/impala/viii-1999-2006/remont/starter/#starting-system__torque-specifications).
  3. Install the positive battery cable and install the solenoid BAT terminal nut finger tight to the starter motor. (Scheme 6) Install the starter solenoid wire and install the starter solenoid S terminal nut finger tight to the starter motor. Tighten the solenoid BAT terminal nut and the starter solenoid S terminal nut to specifications. See «TORQUE SPECIFICATIONS»(/chevrolet/impala/viii-1999-2006/remont/starter/#starting-system__torque-specifications).
  4. Install the torque converter covers. Tighten bolts to specifications. See «TORQUE SPECIFICATIONS»(/chevrolet/impala/viii-1999-2006/remont/starter/#starting-system__torque-specifications). Install the lower air deflector. Tighten bolts to specifications. See «TORQUE SPECIFICATIONS»(/chevrolet/impala/viii-1999-2006/remont/starter/#starting-system__torque-specifications). Lower the vehicle. Connect the negative battery cable. Tighten battery cable to specifications. See «TORQUE SPECIFICATIONS»(/chevrolet/impala/viii-1999-2006/remont/starter/#starting-system__torque-specifications).

Scheme 7

Scheme 7
Scheme 7

STARTER

The PG-260D and PG-260G are non-repairable starter motors. They have pole pieces that are arranged around the armature. Both solenoid windings are energized. The pull-in winding circuit is completed to the ground through the starter motor. The windings work together magnetically to pull and hold in the plunger. The plunger moves the shift lever. This action causes the starter drive assembly to rotate on the armature shaft spline as it engages with the flywheel ring gear on the engine. Moving at the same time, the plunger also closes the solenoid switch contacts in the starter solenoid. Full battery voltage is applied directly to the starter motor and it cranks the engine.

As soon as the solenoid switch contacts close, current stops flowing thorough the pull-in winding because battery voltage is applied to both ends of the windings. The hold-in winding remains energized; its magnetic field is strong enough to hold the plunger, shift lever, starter drive assembly, and solenoid switch contacts in place to continue cranking the engine. When the engine starts, pinion overrun protects the armature from excessive speed until the switch is opened.

When the ignition switch is released from the START position, the START relay opens and battery voltage is removed from the starter solenoid S terminal. Current flows from the motor contacts through both windings to the ground at the end of the hold-in winding. However, the direction of the current flow through the pull-in winding is now opposite the direction of the current flow when the winding was first energized. The magnetic fields of the pull-in and hold-in windings now oppose one another. This action of the windings, along with the help of the return spring, causes the starter drive assembly to disengage and the solenoid switch contacts to open simultaneously. As soon as the contacts open, the starter circuit is turned off.

Moving the ignition switch to the start position sends a 12 volt signal through the PCM (CRANK) fuse in the Junction Block - Left I/P to the PCM to notify the PCM that a crank status has been requested. 12 volts is fed through the ABS/PCM fuse in the Junction Block - Left I/P to the coil side of the CRANK RLY relay. The PCM grounds this circuit when all parameters are met for starting the engine. This closes the CRANK RLY relay allowing Battery Positive voltage through Fusible Link and through the switch side of the CRANK relay to the S terminal of the starter solenoid. Ground is found through the engine block.