Service Precautions

Before proceeding with diagnosis, the following precautions must be followed:

• When using Diagnostic Trouble Code (DTC) tests for diagnosis, DO NOT skip any steps, or incorrect diagnosis may result. Always perform indicated verification procedure after repairs are made.
• When using a jumper wire, ensure either jumper wire or circuit is fuse-protected.
• Ensure ignition is off before removing connector from any control module.
• When checking voltage or continuity at any control module, probe control module harness connector from pin side. DO NOT backprobe harness 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.
• Use specified test equipment when performing electrical tests.