Test Notes

Enter this pinpoint test only when directed here from the symptom flowcharts.

This pinpoint test is intended to diagnose only the following:
- Powertrain Control Module (PCM)
- Injector Driver Module (IDM)
- harness circuits: Fuel Delivery Command Signal (FDCS)

Description
The FDCS is the output that controls the fuel injection timing and controls fuel quantity with the Injection Pressure Regulator (IPR). This signal is sent with the Cylinder Identification (CID) signal to the IDM which provides power and distributes the proper signal to the appropriate injector.

DTC Description
P1663 = FDCS circuit failure