Engine Cold

Perform the following in order:

• Check IACV-air regulator, IACV-AAC valve. Check fast idle cam (Q45). See SYSTEM/COMPONENT TESTS article.
• Check injector operation. See SYSTEM/COMPONENT TESTS article.
• Check ignition spark and spark plugs.
• Inspect harness connector for damaged pins or poor connection.
• Check ECM power supply and ground.
• Replace ECM with known good unit.