Fuel Injector Test: Quest
- 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.
- Turn ignition off. Disconnect injector harness connector(s). Turn ignition on. Measure voltage between ground and injector harness connector Yellow wire(s). Battery voltage should be present. If battery voltage is present, go to next step. If battery voltage is not present, check fusible link, ignition switch, and open or short in Yellow wire between ignition switch and injector(s). Repair or replace as necessary. See WIRING DIAGRAMS
article.
- Turn ignition off. Disconnect PCM harness connector. Check continuity between specified PCM harness connector terminal and appropriate injector harness connector terminal. See INJECTOR CIRCUIT IDENTIFICATION (QUEST) table. If continuity exists in each circuit, go to next step. If continuity does not exist in any circuit, repair open or short in appropriate wire between PCM and injector harness connectors.
- Check fuel injector(s). See FUEL INJECTOR . If fuel injectors are okay, check PCM harness connector terminals for damage or corrosion. Repair or replace as necessary.
INJECTOR CIRCUIT IDENTIFICATION (QUEST)
| Application |
PCM Terminal No. |
Wire Color |
| Injector No. 1 |
102 |
Green/Orange |
| Injector No. 2 |
107 |
Green |
| Injector No. 3 |
104 |
Green/Red |
| Injector No. 4 |
109 |
Yellow/Purple |
| Injector No. 5 |
111 |
Yellow/Green |
| Injector No. 6 |
114 |
Gray/Blue |