Engine 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 ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.

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. Locate ECM behind instrument panel lower cover. Remove retaining fasteners. Disconnect 116-pin harness connector and remove ECM. After installing new ECM. Perform initialization of NVIS (NATS) ignition key IDs. See NISSAN VEHICLE IMMOBILIZER SYSTEM under PROGRAMMING. Perform idle air volume learning procedure. See IDLE AIR VOLUME LEARNING under PROGRAMMING.