PINPOINT TEST G532449p9 : FUEL PUMP DRIVER MODULE (FPDM) POWER AND GROUND CIRCUITS (V8 VEHICLES WITH SUPERCHARGER)

Pinpoint Tests

CAUTION: When probing connectors to take measurements in the course of the pinpoint tests, use the adaptor kit, part number 3548-1358-00.

NOTE: When performing electrical voltage or resistance tests, always use a digital multimeter (DMM) accurate to 3 decimal places, and with an up-to-date calibration certificate. When testing resistance, always take the resistance of the DMM leads into account. Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests.

PINPOINT TEST G532449p9 : FUEL PUMP DRIVER MODULE (FPDM) POWER AND GROUND CIRCUITS (V8 VEHICLES WITH SUPERCHARGER)

G532449t43 : CHECK THE POWER SUPPLY VOLTAGE TO THE FPDM
1. Disconnect the FPDM electrical connector, FP26.
2. Key on, engine off.
3. Make sure the fuel pump relay is energized.
4. Measure the voltage between:

- Is the voltage less than 10 volts?

FPDM connector FP26, Battery
harness side
Pin 05 Negative terminal

-> YES
REPAIR the circuit between the battery and the FPDM. This circuit includes fuse 24 of the rear power distribution box, the fuel pump relay and the mega fuses. CLEAR the DTC, test the system for normal operation.

-> NO
GO to Pinpoint Test G532449t44.

G532449t44 : CHECK THE FPDM GROUND FOR HIGH RESISTANCE
1. Measure the resistance between:

FPDM connector FP26, Battery
harness side
Pin 06 Negative terminal

- Is the resistance greater than 5 ohms?

-> YES
REPAIR the high resistance circuit. For additional information, refer to the wiring diagrams. CLEAR the DTC, test the system for normal operation.

-> NO
CHECK for DTCs indicating a FPDM or ECM fault.