Fuel Injector: Description and Operation

CIRCUIT OPERATION
Power for the fuel injectors is supplied on circuit A142 when the contacts in the Automatic Shut Down (ASD) relay are CLOSED. Battery voltage for the contact side is supplied on circuit A14. This circuit is HOT at all times and protected by a fusible link located near the auxiliary jumper post on the left toe box.

Power for the coil side of the ASD relay is supplied on circuit F12. This circuit is HOT when the ignition switch is in the START or RUN position. Ground for the coil side of the relay is controlled by the Powertrain Control Module (PCM) on circuit K51.

When the PCM supplies a ground path for circuit K51 the contacts in the ASD relay CLOSE connecting circuits A14 and A142. Circuit A142 powers the fuel injectors and is double crimped at the ASD relay to supply an ASD relay energized input to the PCM.

The PCM controls the ground path for the injectors as follows, and each of the circuits connects to the white PCM connector:
- Circuit K11 is the ground circuit for Injector #1. Circuit K11 connects to cavity 4 of the PCM.
- Circuit K12 is the ground circuit for Injector #2. Circuit K12 connects to cavity 15 of the PCM.
- Circuit K13 is the ground circuit for Injector #3. Circuit K13 connects to cavity 5 of the PCM.
- Circuit K14 is the ground circuit for Injector #4. Circuit K14 connects to cavity 16 of the PCM.
- Circuit K38 is the ground circuit for Injector #5. Circuit K38 connects to cavity 6 of the 1CM.
- Circuit K58 is the ground circuit for Injector #6. Circuit K58 connects to cavity 12 of the PCM.
- Circuit K26 is the ground circuit for Injector #7. Circuit K26 connects to cavity 2 of the PCM.
- Circuit K28 is the ground circuit for Injector #8. Circuit K28 connects to cavity 13 of the PCM.
- Circuit K5 is the ground circuit for Injector #9. Circuit K5 connects to cavity 3 of the PCM.
- Circuit K8 is the ground circuit for Injector #10. Circuit K8 connects to cavity 14 of the PCM.