PINPOINT TEST G531332p26 : SENSOR GROUND CIRCUITS OPEN CIRCUIT

Pinpoint Tests

PINPOINT TEST G531332p26 : SENSOR GROUND CIRCUITS OPEN CIRCUIT

G531332t115 : CHECK THE SENSOR GROUND AT THE MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR (VEHICLES WITH SUPERCHARGER)
1. Key off.
2. Disconnect the ECM electrical connector, PI300.
3. Disconnect the MAP sensor electrical connector, PI301.
4. Measure the resistance between:

MAP sensor electrical ECM connector PI300,
connector PI301, harness side harness side
Pin 04 Pin 12

- 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 G531332t116.

G531332t116 : CHECK THE SENSOR GROUND AT THE ENGINE COOLANT TEMPERATURE (ECT) SENSOR
1. Disconnect the ECT sensor electrical connector, PI25.
2. Measure the resistance between:

ECT sensor electrical ECM connector PI300,
connector PI25, harness side harness side
Pin 01 Pin 12

- 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 G531332t117.

G531332t117 : CHECK THE SENSOR GROUND AT THE MASS AIR FLOW (MAF) SENSOR
1. Disconnect the MAF sensor electrical connector, PI14.
2. Measure the resistance between:

MAF sensor electrical ECM connector PI300,
connector PI14, harness side harness side
Pin 05 Pin 12

- 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 sensor fault. Refer to the warranty policy and procedures manual if an ECM is suspect.