PINPOINT TEST G531332p21

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 PI14, Battery
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 PI14, ECM connector PI300,
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 PI14, Battery
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 if an ECM is suspect.