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Fuel Injector Test

NOTE: A fault in fuel injector circuit should set DTC P0170, DTC P0171, DTC P0172, DTC P0173, DTC P0174 or DTC P0175. To test system, see diagnostic procedures in appropriate TESTS W/CODES article.
  1. With engine running, listen for clicking sound at each injector. If clicking sound is present at each injector, system is functioning properly. If clicking sound is not present, go to next step.
  2. Turn ignition (engine) off. Disconnect injector harness connector(s). Turn ignition on. Measure voltage between ground and injector harness connector Red wire(s). Battery voltage should be present. If battery voltage is present, go to next step. If battery voltage is not present, check 10-amp fuse, harness, and connectors between battery and injector(s). Repair or replace as necessary.
  3. Check fuel injector(s). See FUEL INJECTOR. If fuel injectors are okay, check ECM terminals, harness, and connector terminals for damage or corrosion. Repair or replace as necessary.
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