Self-Diagnostic System: Precautions

Before proceeding with diagnosis, observe following precautions:

• Ensure battery is fully charged.
• Probe PCM connector from pin side. DO NOT  backprobe PCM connector or probe wires through insulation.
• DO NOT  cause short circuits when performing electrical tests. This will set additional DTCs, making diagnosis of original problem more difficult.
• DO NOT  use a test light in place of a voltmeter.
• Always begin repair with lowest DTC number (MIL) or first DTC displayed (scan tool).
• Always perform verification test after repairs are made.
• Always disconnect scan tool after use.
• Always disconnect scan tool before charging battery.