OEM Buick Lucerne Engine Control Module

Buick Lucerne Engine Control Module Parts Questions & Experts Answers

• PCM
  12600930
  Q: How to replace the Engine Control Module (ECM) on Buick Lucerne?

  A:

  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.