PINPOINT TEST G531332P1

Pinpoint Tests

PINPOINT TEST G531332p1 : MASS AIR FLOW (MAF) SENSOR CIRCUIT RANGE/PERFORMANCE, HIGH/LOW VOLTAGE

G531332t1 : CHECK THE MAF SENSOR SENSING CIRCUIT FOR HIGH RESISTANCE
1. Key off.
2. Disconnect the ECM electrical connector, PI300.
3. Disconnect the MAF sensor electrical connector, PI14.
4. Measure the resistance between:

ECM connector PI300, MAF connector PI14,
harness side harness side
Pin 70 Pin 03

- 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 G531332t2.

G531332t2 : CHECK THE MAF SENSOR SENSING CIRCUIT FOR SHORT CIRCUIT TO POWER
1. Key on, engine off.
2. Measure the voltage between:

MAF connector PI14, Battery
harness side
Pin 03 Negative terminal

- Is the voltage greater than 3 volts?

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

->NO
GO to Pinpoint Test G531332t3.

G531332t3 : CHECK THE MAF SENSOR SENSING CIRCUIT FOR SHORT CIRCUIT TO GROUND
1. Key off.
2. Measure the resistance between:

MAF connector PI14, Battery
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 G531332t4.

G531332t4 : CHECK THE MAF SENSOR SUPPLY CIRCUIT VOLTAGE
1. Reconnect the ECM electrical connector, PI300.
2. Key on, engine off.
3. Measure the voltage between:

MAF connector PI14, Battery
harness side
Pin 01 Negative terminal

- Is the voltage greater than 10 volts?

->YES
INSTALL a new MAF sensor. CLEAR the DTC. TEST the system for normal operation.

->NO
REPAIR the circuit between the MAF sensor electrical connector, PI14, pin 01 (GU) and BATTERY. This circuit includes the EMS control relay, fuse 14 of the front power distribution box, and the high power protection module. CLEAR the DTC. TEST the system for normal operation.