Powertrain Control Module Replacement
CAUTION:
To prevent internal damage to ECM, ignition must be in OFF position before disconnecting battery or any harness connectors.
NOTE:
Before replacing any component that scan tool suggests are faulty. Ensure that all wiring connections and harness connectors are okay. Ensure that power and ground circuits are functioning properly. For circuit identification, see WIRING DIAGRAMS
.
NOTE:
To prevent possible electrostatic discharge damage to ECM, DO NOT touch ECM connector pins or soldered components on circuit board. DO NOT open replacement part package until part is ready to be installed. Before removing part from packaging, ground package to a known good ground on vehicle. If part has been handled while sitting in car, or while walking around, touch a known good ground before installing part.
Service of ECM normally consists of replacement of or programming of EEPROM. If ECM is to be replaced, ensure that replacement part is correct one for application. New ECM EEPROM must be programmed. To program EEPROM, go to EEPROM PROGRAMMING PROCEDURE . To replace ECM perform following steps:
- Disconnect negative battery cable.
- Block the wheels.
- Remove 2 ECM harness connector retaining screws. See Fig 1 .
- Disconnect ECM 80-pin harness connectors E-21 (Blue) and E-22 (Red). See Fig 2 .
- Remove retaining clip, and remove ECM.
- To install, reverse removal procedure. Program ECM. See EEPROM PROGRAMMING PROCEDURE .