PINPOINT TEST G531332p21 : MASS AIR FLOW (MAF) SENSOR GROUND MALFUNCTION

Pinpoint Tests

PINPOINT TEST G531332p21 : MASS AIR FLOW (MAF) SENSOR GROUND MALFUNCTION

G531332t80 : CHECK THE MAF SENSOR GROUND
1. Disconnect the MAF sensor electrical connector, PI14.
2. Key on, engine off.
3. Measure the resistance between:

MAF sensor connector Battery
PI14, harness side
Pin 02 Negative terminal

- Is the resistance greater than 5 ohms?

-> YES
GO to Pinpoint Test G531332t81.

-> NO
INSTALL a new MAF sensor. CLEAR the DTC. TEST the system for normal operation.

G531332t81 : CHECK THE MAF SENSOR GROUND CIRCUIT FOR HIGH RESISTANCE
1. Key off.
2. Disconnect the ECM electrical connector, PI300.
3. Measure the resistance between:

MAF sensor connector ECM connector PI300,
PI14, harness side harness side
Pin 02 Pin 18

- 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 G531332t82.

G531332t82 : CHECK THE MAF SENSOR GROUND CIRCUIT FOR SHORT CIRCUIT TO POWER
1. Key on, engine off.
2. Measure the voltage between:

MAF sensor connector Battery
PI14, harness side
Pin 02 Negative terminal

- Is the voltage greater than 3 volts?

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

-> NO
Refer to the warranty policy and procedures manual if an ECM is suspect.