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Home >> Pontiac >> 1998 >> Firebird V8-5.7L VIN G >> Repair and Diagnosis >> Relays and Modules >> Relays and Modules - Powertrain Management >> Relays and Modules - Computers and Control Systems >> Engine Control Module >> Service and Repair >> Powertrain Control Module (PCM) Replacement >> With Automatic Transmission

With Automatic Transmission

PCM REPLACEMENT / PROGRAMMING
Service of the PCM should normally consist of either replacement of the PCM or EEPROM programming. If the diagnostic procedures call for the PCM to be replaced, the PCM should be checked first to see if it is the correct part. If it is, remove the faulty PCM and install the new service PCM.

THE SERVICE PCM EEPROM WILL NOT BE PROGRAMMED. DTC P0601 and P0602 indicates the EEPROM is not programmed or has malfunctioned.

Important: The following must be perform anytime the PCM is replaced:

1. Programming of the EEPROM
2. The Idle Learn Procedure
3. The CKP System Variation Learn Procedure
4. The Functional Check

The following must be perform anytime the PCM is disconnected or looses power:

1. The Idle Learn Procedure
2. The Functional Check

CAUTION:
- To prevent internal PCM damage, the ignition must be OFF when disconnecting or reconnecting power to the PCM (for example, battery cable, PCM pigtail, PCM fuse, jumper cables, etc.).
- Ensure that the hood is free of contaminates (moisture) before servicing the PCM. The moisture flows into the PCM connector body when the PCM is disconnected and the hood is opened.

REMOVAL PROCEDURE

CAUTION:
- Remove any debris from the PCM connector surfaces before servicing the PCM. Inspect the PCM module connector gaskets when diagnosing/replacing the PCM. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion into the PCM.
- Do not touch the connector pins or soldered components on the circuit board in order to prevent possible electrostatic discharge (ESD) damage to the PCM.
- In order to prevent internal damage to the PCM, the ignition must be OFF when disconnecting or reconnecting the PCM connector.

Description:







Description:






1. Disconnect the PCM connectors.
2. Remove the mounting fasteners from the PCM bracket.
3. Remove the PCM and mounting bracket assembly from the engine compartment.
4. Remove the PCM from the mounting bracket.

INSTALLATION PROCEDURE
1. Install the PCM to the mounting bracket.
2. Install the PCM and mounting bracket assembly into the vehicle.
3. Reconnect the PCM connectors.
4. If a new PCM is being installed, program the EEPROM.

EEPROM PROGRAMMING
1. Setup Ensure that the following conditions have been met:
^ The battery is fully charged.
^ The ignition is ON.
2. Program the PCM using the latest software matching the vehicle.
- Refer to GM Techline terminal/equipment users instructions.
3. If the PCM fails to program, proceed as follows:
^ Ensure that all PCM connections are OK.
^ Check the Techline terminal/equipment for the latest software version.
^ Attempt to program the PCM. If the PCM still cannot be programmed properly, replace the PCM. The replacement PCM must be programmed.

IDLE LEARN PROCEDURE
Anytime the PCM or the battery is disconnected or the PCM looses power, the PCM's learned position of the IAC valve pintle is lost. The engine idle is unstable when the IAC pintle position is lost. Perform the following procedure in order to return the IAC valve pintle to the correct position:

1. Turn OFF the ignition.
2. Restore the PCM battery feed.
3. Turn OFF the A/C controls.
4. Set the parking brake and block the drive wheels.
5. Start the engine.
6. Shift the transmission selector into the drive range.
7. Allow the engine to idle for 10 minutes.
8. Turn ON the A/C controls.
9. Allow the engine to idle for 10 minutes.
10. Shift the transmission selector into the park range.
11. Allow the engine to idle for 10 minutes.
12. Turn OFF the A/C controls.
13. Allow the engine to idle for 10 minutes.
14. Turn OFF the engine for 30 seconds.

FUNCTIONAL CHECK
1. Clear the Diagnostic Trouble Codes (DTCs).
2. Perform the On-Board Diagnostic System Check.
3. Start the engine and idle for one minute.
4. Use the scan tool in order to check for DTCs.

CKP SYSTEM VARIATION LEARN PROCEDURE

Important: While the learn procedure is in progress, release the throttle immediately when the engine starts to decelerate. The engine control is returned to the operator and the engine will respond to throttle position after the learn procedure is complete.

1. Install the scan tool.
2. Apply the vehicle's parking brake.
3. Block the drive wheels.
4. Close the vehicle's hood.
5. Place the vehicle's transmission in Park.
6. Idle the engine until the engine coolant temperature reaches 65°C (150°F).
7. Turn OFF all the accessories.
8. Apply the brakes for the duration of the procedure.

Important: If the CKP System Variation Learn Procedure cannot be completed successfully, refer to DTC P1336 CKP System Variation Not Learned for additional diagnostic information.

9. Enable the Crankshaft Position System Variation Learn Procedure with the scan tool.
10. Slowly raise the engine speed to 4000 RPM.
11. Immediately release the throttle when the engine speed decreases.
12. Turn OFF the ignition for 15 seconds after the learn procedure is completed successfully.

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