Service Precautions

CAUTION: When battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See the COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION before disconnecting battery.

Before proceeding with diagnosis, the following precautions must be observed.

Vehicle must have a fully charged battery and functional charging system.
Probe SBEC 60-pin connector from pin side. DO NOT backprobe SBEC connector.
DO NOT cause short circuits when performing electrical tests. This will set additional fault codes, making diagnosis of original problem more difficult.
Always repair lowest fault code number (CHECK ENGINE light) or first fault displayed (DRB-II) before repairing others.
Always perform appropriate VERIFICATION TEST SP-VER after repairs are made.