OEM Buick Terraza Engine Control Module

Buick Terraza Engine Control Module Parts and Q&A

• PCM
  12678511
  Q: How to replace the Engine Control Module on Buick Terraza?

  A:

  The first step to replace the powertrain control module (PCM) requires using a scan tool to obtain data about engine oil lifetime percentage. Commence by taking off the left sheet metal diagonal brace together with disconnecting the negative Battery Cable. You need to remove the air cleaner assembly cover before lifting the pcm out of its position in the air cleaner assembly. After disconnecting the pcm harness connectors you must remove the pcm from its installation position in the engine compartment. Installation requires connecting the pcm electrical connectors then placing the pcm within the air cleaner assembly before reinstalling and tightening air cleaner assembly cover screws to 4 n.m (35 lb in). Attach the left sheet metal diagonal brace while reattaching the negative Battery Cable connection. The computer needs eeprom programming after installation of a new pcm. A replacement control module should be programmed to maintain the current engine oil life information since programming it with 100 percent default will trigger an instant 5000-kilometer (3000-mile) oil change period from the previous change. Touching the connector pins or solder components on the circuit board should be avoided to avoid damage from electrostatic discharge while also ensuring correct installation of the control module connector gaskets to stop contaminants from intruding.
• PCM
  19210069
  Q: What does the service of the engine control module (ECM) typically involve on Buick Terraza?

  A:

  The powertrain control module (PCM) service requires pcm replacement or electrically erasable programmable read-only memory (EEPROM) programming as the central procedures. A proper inspection of the pcm should be performed to verify the correct part. Per service procedure remove the defective pcm then place the new service unit and apply the broadcast code and production number to the corresponding garment which will provide identification through the vehicle lifetime. The new service pcm must be programmed according to the eeprom status through the diagnosis code p0602. All internal components in the pcm remain unfriendly for user maintenance and must not undergo manual opening. Use a scan tool to acquire and record the current engine oil lifetime percentage because failed programming will cause a default setting to trigger an immediate oil change after 5,000 km (3,000 mi) post-last oil change. The negative Battery Cable and left sheet metal diagonal brace need removal for accessing the pcm while taking off the air cleaner assembly cover before extracting the pcm from the air cleaner assembly. Remove the pcm from the engine compartment after disconnecting all harness connectors from its surface. The pcm installation process begins with connecting its electrical connectors before putting the pcm into the air cleaner assembly and screwing in the air cleaner assembly cover with a torque setting of 4 n.m (35 lb in). Attach the left sheet metal diagonal brace to its position while reestablishing the negative Battery Cable connectivity. Programming of eeprom needs to be performed whenever owners replace their pcm.