GM 12600930
PCM

You need to get the percentage of engine oil remaining along with automatic transaxle fluid life using a scan tool before replacing the powertrain control module (PCM). First disconnect the negative cable from the battery before switching off the ignition. The first step involves eliminating the intake manifold cover while disconnecting the engine harness electrical connector from the mass air flow/intake air temperature (MAF/IAT) sensor then removing the positive crankcase ventilation (PCV) tube from the air cleaner outlet duct. The air cleaner outlet duct should be detached from the Throttle Body while lower housing clips and upper housing front tabs are released to separate the air cleaner upper housing. The procedure requires disconnecting the lever locks on the engine harness electrical connectors before removing links from the pcm and extracting the pcm from its position within the air cleaner lower housing. Verify that the air filter/pcm housing assembly and maf/iat sensor inlet screen along with both components of the air filter/pcm housing assembly or intake air duct remain unharmed before installing the new pcm. When installing the new pcm into the lower air cleaner housing users must first reconnect engine harness electrical connectors before locking the connector lever. Reinstall the air cleaner upper housing after ensuring it fits correctly between the upper and lower housing components along with complete clip installation. The air cleaner outlet duct must be correctly installed toward the Throttle Body before tightening the clamp to 4 n.m (35 lb in). The pcv tube installation should be completed by connecting it to the air cleaner outlet duct while installing the engine harness electrical connector to the maf/iat sensor. Place on the intake manifold cover and restore the negative Battery Cable connection. Program the pcm to avoid defaulting to 100 percent usage since it would require an oil change at 5,000 km (3,000 mi) and automatic transaxle fluid change at 83,000 km (50,000 mi) from the previous service dates.

Providing Engine Control Module (ECM) replacement service begins with turning off ignition and verifying the ecm Fuse has no main relay circuit voltage. A diagnostic tool will help obtain engine oil life measurement information which needs to be programmed into the new module because the module will default to 100 percent without this data. The first step involves disconnecting the battery negative cable to remove the ecm as well as the tcm/ipc and ecm/tcm fuses which are present in the underhood Fuse block. Start by taking off the ecm connectors from both engine side (inboard) and body side (outboard) positions and then unfasten the ecm redundant ground wire and bolt before proceeding with ecm bolt removal. The ecm bracket and its bolts need to be taken away if needed during installation. After bracket removal install the bracket once again before tightening its bolts to 10 n.m (89 lb in). Install the ecm while securing it with the bolts and tighten both to 10 n.m (89 lb in). Secure the ecm redundant ground wire with its bolt by tightening to 5 n.m (44 lb in). You must connect the engine side (inboard) and body side (outboard) ecm connectors for installation and place the ecm/tcm, tcm/ipc, ecm fuses back into the underhood Fuse block. To finish the installation connect the negative Battery Cable followed by ecm programming which requires turning off ignition for at least 5 seconds prior to concluding the programming.

The replacement module must be programmed with this information to avoid defaulting to 100 percent.

Failure to program the new PCM with this information will default both to 100%, necessitating an oil change at 5000 km (3,000 mi) and a transaxle fluid change at 83000 km (50,000 mi) from the last changes.

Ensure the upper housing front tabs engage with the lower housing and the lower housing clips are secured.