GM/Detroit 6.5L ENGINE CONTROLS – PCM Replacement/Programming

Service of the PCM shoul d normally consist of replacement of the PCM.
If the diagnostic procedures call for replacing the PCM, peform the following procedures in the following order:
1. Programming the PCM
2. Passlock Learn Procedure
3. Programming the TDC Offset

Removal Procedure
Caution: Refer to Battery Disconnect Caution in Cautions and Notices.
1. Remove the negative battery cables.
2. Remove the PCM from the passenger compartment behind the glove box.
3. Remove the connectors from the PCM.
Important: To prevent possible electrostatic discharge to the PCM, do not touch the component leads, and do not remove the integrated circuit from the carrier.
4. Remove the PCM mounting hardware.

Installation Procedure
1. Install the PCM mounting hardware.
2. Install the connectors to the PCM.
3. Install the PCM in the passenger compartment behind the glove box.
4. Install the negative battery cables.
The MIL, antilock and brake lamps will continue to be enabled until the PCM is programmed. Once the programming is complete, the lamps will turn OFF and normal operation will occur.
5. Refer to PCM Programming.

PCM Programming
1. Verify the following for the setup:
• The battery is charged.
• The ignition is ON.
• The battery/cig. lighter connection is secure.
• The Data Link Connector is attached.
2. Perform the programming. Refer to the up to date Techline terminal/equipment for user instructions.
3. Perform the Passlock Learn Procedure. Refer to Password Learn Procedure.

4. After the vehicle has been programmed, operate the vehicle until the coolant temperature is greater than 77°C (170°F). This will allow the TDC Offset to be programmed (refer to Programming the TDC Offset).
5. Check the Data list for TDC Offset.
6. If the PCM fails to reprogram, do the following:
• Check all the PCM connections.
• Check the Techline terminal/equipment for the latest software version.
• Try again to reprogram the PCM. If it fails again, replace the PCM. Refer to PCM replacement.

Programming the TDC Offset
The PCM will automatically activate the TDC Offset program when the engine coolant is greater than 77°C (170°F). If the PCM is not programmed with a TDC Offset, a DTC P1214 will set.

Password Learn Procedure
Passlock Learn Procedure Using a T50/T60/T20+
Important: Performing the following procedures will cause a DTC P1630 to set when they are completed. This is the intended functionality. Once P1630 is set, turn the ignition OFF for 30 seconds, then turn the ignition ON and P1630 will clear. If P1630 does not clear, refer to DTC P1630 Theft Deterrent PCM in Learn Mode.
1. Using the T50/T60/T20+, enter the Service Programming System (SPS).
2. Select Terminal to Vehicle Programming.
3. Select Done and follow instructions on Vehicle Set-up screen
4. Select Vehicle Theft Re-learn.
5. Follow the instructions on the remaining screens.
• The PCM and the Passlock control module will prepare for a re-learn.
• A security timer will be ON for approximately 10 minutes or until DTC P1630 sets.
• When the PCM and the Passlock control module are prepared to re-learn, turn the ignition OFF for 30 seconds and then start the engine.

Passlock Learn Procedure Using a Tech 2 Scan Tool
Important: Performing the following procedures will cause a DTC P1630 to set when they are completed. This is the intended functionality. Once it is set, turn the ignition OFF for 30 seconds, then turn the ignition ON and P1630 will clear. If P1630 does not clear, refer to DTC P1630 Theft Deterrent PCM in Learn Mode.
1. Using a Tech 2 enter the Service Programming System (SPS).
2. After entering the vehicle information, choose the Request Info soft key on the Tech 2.
3. Select Done and follow the instructions on the Vehicle Set-up screen

4. Disconnect the Tech 2 from the vehicle and connect the Tech 2 to a Techline terminal.
5. At the Techline terminal, select Service Programming System (SPS), select the Terminal to Scan Tool Programming method and then select Done.
6. Follow the instructions on the remaining screens.
7. Select Vehicle Theft Re-learn.
8. Select Program at the summary screen. The terminal will download the information to the Tech 2.
9. Return the Tech 2 to the vehicle and connect the Tech 2 to the Diagnostic Link Connector (DLC).
10. Select Service Programming from the Tech 2 main menu. Answer the prompts regarding the model year and vehicle type. Press the Theft Re-learn soft key on the Tech 2.
11. Follow the instructions on the remaining screens.
• The PCM and the Passlock control module will prepare for re-leam.
• A security timer will be on for approximately 10 minutes or until DTC P1630 sets.
• When the PCM and the Passlock control module are prepared to re-learn, turn the ignition OFF for 30 seconds and then start the engine.

Passlock Learn Procedure w/o Tech 2 Scan Tool or Techline Terminal

Important: While the PCM is in the Auto Learn Procedure, maintain the battery voltage at all times. Follow the procedure exactly as indicated or the procedure will have to be repeated from the beginning.

Important: Performing the following procedures will cause a DTC P1630 to set when they are completed. This is the intended functionality. Once it is set, turn the ignition OFF for 30 seconds, then turn the ignition ON and P1630 will clear. If P1630 does not clear, refer to DTC P1630 Theft Deterrent PCM in Learn Mode.
1. Attempt to start the vehicle (the vehicle will start and stall), after the engine has stalled, leave the ignition ON for 10 minutes (the security light will remain ON for 10 minutes and then go OFF).
2. After the Security lamp turns OFF, turn the ignition OFF for 30 seconds.
3. Again, attempt to start the vehicle (the vehicle will start and stall), after the engine has stalled, leave the ignition ON for 10 minutes (the security light will remain ON for 10 minutes and then go OFF).
4. After the Security lamp turns OFF, turn the ignition OFF for 30 seconds.
5. Again, attempt to start the vehicle (the vehicle will start and stall), after the engine has stalled, leave the ignition ON for 10 minutes (the security light will remain ON for 10 minutes and then go OFF) or until DTC P1630 sets.
6. Turn the ignition OFF for 30 seconds.
7. Turn the ignition ON and wait 30 seconds.
8. Attempt to start the engine.

 

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