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Engine Management System Troubleshooting
EFI systems are complex. As such, there are many possible causes when a running issue is encountered. At times it can be confusing if an issue
is caused by a mechanical problem or the EFI components.
Always contact your genuine dealer if you are having trouble with your vehicle's Engine Management System.
EFI System Maintenance Procedures
1) Do not disassemble components arbitrarily. It may damage the components.
2) Turn the ignition off prior to connecting or disconnecting any connector including diagnostic controller.
3) Make sure the temperature of the ECU is below 175° F
4) The fuel pressure is very high (about 36 psi), so please do not disassemble the fuel line arbitrarily. If the fuel line needs to be removed, please
release the pressure first, and make service is completed in a ventilated area by genuine technicians.
5) When disassembling the fuel pump, make sure the power is off or it may cause fire.
6) The fuel pump cannot be contaminated with air or water, as it will shorten the useful life. The positive and negative poles of the fuel pump
cannot be reversed.
7) The ignition system check should only be completed when it is necessary. When checking the spark plug out of the engine, make sure the
throttle is closed. Excess unburned fuel coming into the catalyst may damage the catalyst.
8) The idle speed is adjusted by the ECU. The idle screw is not to be adjusted.
9) The Positive and Negative poles of the battery cannot be reversed. It may damage the EFI components.
10) Do not remove the battery when the engine is running.
11) Do not attempt to measure electrical signals by piercing the wire harness.
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