Diagnostic Tests: Notes

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 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. To identify ECM terminals referenced in testing, see PIN VOLTAGE/CIRCUIT RESISTANCE CHARTS article. To identify circuits and wire colors referenced in testing, see WIRING DIAGRAMS article.

NOTE: During testing procedures, Bank 1 refers to engine performance component located on left cylinder bank. Bank 2 refers to engine performance component located on right cylinder bank.