GM 12209614
PCM

A scan tool enables the clearing process for DTCs before performing Engine Control Module service operations. Continue by trying to start the engine again but if it fails to start correctly perform Service Programming once more. Before starting the PCM programming sequence make sure all connections between the control module and DLC are tight and that Techline operating software is updated to latest version and the calibration part number matches the vehicle specification. The last step should involve control module programming but if the control module fails to program correctly then replacement is necessary.

The programming of Engine Control Modules should start by gathering the vehicle's VIN. The Techline(R) terminal allows programmers to access Service Programming followed by choosing Tech 2(R) and Reprogram ECU then specifying Off-Board Programming Adapter as the ECU location. The correct harness connector from the Off-Board Programming Adapter kit needs to connect the control module and Off-Board Programming Adapter with Tech 2(R). Access the Service Programming Request Information feature from the Tech 2(R) device to establish connection with the control module before getting the access code followed by exiting the feature. Connect the Tech 2(R) to the Techline(R) terminal while turning it ON after removing it from the Off-Board Programming Adapter. The user must input their vehicle's VIN into the Techline(R) terminal after which the terminal will show the necessary database connection message. The first step is to choose the correct programming type then access the appropriate calibration file while making sure all connections remain fastened. After verifying the calibration summary on the Techline(R) terminal it begins an automatic file transfer to the Tech 2(R). Close the Tech 2(R) system after completion of the download process and disconnect it from the Techline(R) terminal before connecting it to the Off-Board Programming Adapter. Select Service Programming on the Tech 2(R). The programming process should be completed while keeping the Off-Board Programming Adapter powered up because security connections must remain intact and Techline(R) operating software needs to be updated before starting another control module reprogramming attempt. A failed reprogramming process requires replacement of the control module. To conclude select Program from the Tech 2(R) then disable Service Programming and complete the download before turning OFF the Off-Board Programming Adapter.

Through the service programming system (SPS) technicians can access control modules using the data link connector (DLC) and the serial data circuit identical to the one used by diagnostic tools when retrieving diagnostic trouble codes (DTCs) and additional system functions. A control module incorporates two memory systems including electrically erasable programmable read only memory (EEPROM) for storing vehicle identification number (VIN) and learned crankshaft positions with other learned data and software information and control module security items and flash read only memory that comes with greater memory capacity yet requires complete data erasure before programming new information. Football data factory utilizes (Tech 2) for remote programming and (Tech 2) for pass-thru programming and uses (Off-board Programming Adapter) for off-board remote and off-board pass-thru programming processes. These operations need the control module either to be present in the vehicle or absent based on the chosen method. Control module programming should be done only for replacement instructions or updated software releases after checking that vehicle voltage falls between 12 to 16 volts with functional charging systems and no battery chargers present. Secure any tool connections before disabling systems that could drain battery power and check the ignition position while maintaining absolute tool stability to prevent problems during the programming procedure. After programming, the powertrain may operate differently, requiring the control module to re-learn values such as fuel trim correction, idle air control (IAC) learned position, and automatic transmission shift adapts, while additional service procedures may be necessary if a control module is replaced, including the crankshaft variation learn procedure, engine oil life reset procedure, idle learn procedure, inspection/maintenance complete system set procedure, vehicle theft deterrent password learn procedure, and throttle position (TP) sensor learn procedure.

Reconnect the negative battery cable and program the new PCM using the Service Programming System (SPS) procedures.

Turn OFF the Tech 2 and disconnect it from the Techline terminal.

Disconnect the negative battery cable, remove the left sheet metal diagonal brace, and take off the air cleaner assembly cover to lift the PCM from the assembly.

Select Service Programming, then choose Tech 2, Reprogram ECU, and Off-Board Programming Adapter as the ECU location.

Ensure the replacement part is correct by inspecting the faulty PCM.

Ensure all connections are secure.

Transfer the broadcast code and production PCM number to the service PCM label without recording on the PCM cover.

Ensure that the ignition is turned OFF to prevent internal damage during the installation or removal of PCM connectors and power connections.

The replacement PCM will not permit secondary air injection (AIR) pump operation until a total of 16 km (10 mi) have been accumulated.

Exit Service Programming, turn OFF the Tech 2, and disconnect it from the vehicle.