Engine Controls - Removal, Overhaul & Installation: Introduction
CAUTION:
When battery or ECM is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until adaptation systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES - IMPORT
article in GENERAL INFORMATION before disconnecting battery.
NOTE:
Before replacing any component(s) 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
article.
NOTE:
Not all procedures apply to all models. Most components are a simple unbolt and bolt-on procedure. For component locations, see COMPONENT LOCATIONS
in SYSTEM & COMPONENT TESTING article.
NOTE:
On I35, Maxima, Pathfinder, QX4 and Sentra, each time Intake Air Control Valve-Auxiliary Air Control (IACV-AAC) valve, throttle body, Accelerator Pedal Position (APP) sensor or ECM are disconnected or replaced, Idle Air Volume Learning procedure must be performed. See IDLE AIR VOLUME LEARNING .
Removal, overhaul and installation procedures are covered in this article. If component removal and installation is primarily an unbolt and bolt-on procedure, only a torque specification may be furnished.