Service Precautions

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

• Ensure fuel pressure is released before disconnecting fuel line or fittings, as fuel system is under pressure and may cause personal injury.
• When using diagnostic tests for diagnosis, DO NOT skip any steps, or incorrect diagnosis may result. When instructed to disconnect any connector, check that the connector is clean and in good condition after disconnecting the connector. Repair or clean connector as necessary.
• When checking voltage or continuity at any control module, probe connector for control module from pin side. DO NOT probe wires through the insulation. DO NOT backprobe connector unless specifically directed to do so.
• DO NOT cause short circuits when performing electrical tests. This will set additional Diagnostic Trouble Codes (DTC), making diagnosis of original problem more difficult.
• Before disconnecting connector from any control module, ensure ignition is off before removing connector.
• Use specified test equipment when performing electrical tests.
• DO NOT prolong testing of injectors or engine may hydrostatically lock.
• When using a jumper wire, ensure either jumper wire or circuit is fuse-protected.
• When replacing Electronic Automatic Transaxle Electronic Control Module (EATX-ECM), pinion factor procedure should be performed. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION.