PINPOINT TEST G532449p7 : ECM TO FPDM MONITOR AND CONTROL 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 G532449p7 : ECM TO FPDM MONITOR AND CONTROL CIRCUITS (V8 VEHICLES WITH SUPERCHARGER)
1. Key off.
2. Disconnect the FPDM electrical connector, FP26.
3. Measure the resistance between:

FPDM connector Battery
FP26, harness side
Pin 04 Negative terminal

- Is the resistance less than 10,000 ohms?

-> YES
REPAIR the short circuit. CLEAR the DTC, test the system for normal operation.

-> NO
GO to Pinpoint Test G532449t28.

G532449t28 : CHECK THE ECM TO FPDM MONITOR CIRCUIT FOR SHORT CIRCUIT TO POWER
1. Measure the resistance between:

FPDM connector Battery
FP26, harness side
Pin 04 Positive terminal

- Is the resistance less than 10,000 ohms?

-> YES
REPAIR the short circuit. CLEAR the DTC, test the system for normal operation.

-> NO
GO to Pinpoint Test G532449t30.

G532449t30 : CHECK THE ECM TO FPDM CONTROL CIRCUIT FOR SHORT CIRCUIT TO GROUND
1. Measure the resistance between:

FPDM connector Battery
FP26, harness side
Pin 03 Negative terminal

- Is the resistance less than 10,000 ohms?

-> YES
REPAIR the short circuit. CLEAR the DTC, test the system for normal operation.

-> NO
GO to Pinpoint Test G532449t31.

G532449t31 : CHECK THE ECM TO FPDM CONTROL CIRCUIT FOR SHORT CIRCUIT TO POWER
1. Measure the resistance between:

FPDM connector Battery
FP26, harness side
Pin 03 Positive terminal

- Is the resistance less than 10,000 ohms?

-> YES
REPAIR the short circuit. CLEAR the DTC, test the system for normal operation.

-> NO
GO to Pinpoint Test G532449t32.

G532449t32 : CHECK THE ECM TO FPDM MONITOR CIRCUIT FOR HIGH RESISTANCE
1. Disconnect the ECM electrical connector, EC300.
2. Measure the resistance between:

FPDM connector ECM connector EC300,
FP26, harness side harness side
Pin 04 Pin 21

- Is the resistance greater than 5 ohms?

-> YES
REPAIR the high resistance circuit. CLEAR the DTC, test the system for normal operation.

-> NO
GO to Pinpoint Test G532449t33.

G532449t33 : CHECK THE ECM TO FPDM CONTROL CIRCUIT FOR HIGH RESISTANCE
1. Measure the resistance between:

FPDM connector ECM connector EC300,
FP26, harness side harness side
Pin 03 Pin 20

- Is the resistance greater than 5 ohms?

-> YES
REPAIR the high resistance circuit. CLEAR the DTC, test the system for normal operation.

-> NO
CHECK for DTCs indicating a module fault.