Fuel Injector: Testing and Inspection

1. Start the engine and listen at each injector for a clicking sound.
2. Turn the ignition switch off.
3. Disconnect the two pin connector from the injector.

Injector Terminal Pin Identification.:

4. Measure the resistance between the two injector terminals. Resistance should measure 1.5 - 2.5 ohms. If resistance is out of spec, replace the injector.
5. If resistance checks OK, turn ignition switch on. Measure voltage between RED/BLACK (+) connector terminal and chassis ground. Voltage should read battery voltage. If voltage tests OK, proceed to step 6. If voltage does not test OK:
^ Turn ignition switch off. Remove six pin connector at injector resistor. turn ignition switch on.
^ Measure voltage between YELLOW/BLACK (+) terminal and chassis ground. Voltage should read battery voltage.
^ If battery voltage exists at YELLOW/BLACK (+) terminal but not at RED/BLACK (+) injector terminal, test injector resistor.
6. turn Ignition switch off. Reconnect two pin connector at injector. Install Test Harness at Programmed Fuel Injection Electronic Control Module (PGM-FI ECM) and harness. Turn ignition switch on.
7. Measure voltage between terminal A-23 (-) and:
^ Terminal A1 for injector #1
^ Terminal A3 for injector #2
^ Terminal A5 for injector #3
^ Terminal A2 for injector #4
Voltage should read battery voltage. If voltage checks OK but symptom/DTC indication still exists, replace PGM-FI ECM with known good part and retest. If voltage does not test OK, inspect for open wire between the PGM-FI ECM and injector connector.