Diagnostic Tests: Notes

WARNING: This page is about a different car, the 2002 Isuzu Trooper. However, it is still accessible from the selected car via links, so may be relevant.

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 article in GENERAL INFORMATION before disconnecting battery.

NOTE: While limited diagnostic information is available, vehicle manufacturer does not support diagnostic information using aftermarket scan tools. To properly diagnose vehicle, it is recommended to use TECH 2 scan tool.

NOTE: If Powertrain Control Module (PCM) requires replacement, PCM must be reprogrammed using TECH 2 or equivalent OBD-II compatible scan tool and special manufacturer equipment.

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 article.

NOTE: To identify PCM terminals referenced in testing, see PIN VOLTAGE CHARTS article. To identify circuits and wire colors referenced in testing, see WIRING DIAGRAMS article.