PINPOINT TEST G532449p5

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 G532449p5 : ECM TO REM DRIVE CIRCUIT (V6 AND V8 VEHICLES WITHOUT SUPERCHARGER)

G532449t23 : CHECK THE ECM TO REM DRIVE CIRCUIT FOR SHORT CIRCUIT TO GROUND
1. Disconnect the REM electrical connector, CR11.
2. Measure the resistance between:

REM connector CR11, Battery
harness side
Pin 19 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 G532449t24.

G532449t24 : CHECK THE ECM TO REM DRIVE CIRCUIT FOR SHORT CIRCUIT TO POWER
1. Measure the resistance between:

REM connector CR11, Battery
harness side
Pin 19 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 G532449t22.

G532449t22 : CHECK THE ECM TO REM DRIVE CIRCUIT FOR HIGH RESISTANCE
1. Disconnect the ECM electrical connector, EC300.
2. Measure the resistance between:

REM connector CR11, ECM connector EC300,
harness side harness side
Pin 19 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 REM or ECM fault.