PINPOINT TEST G531332p41 : MANIFOLD ABSOLUTE PRESSURE/TEMPERATURE (MAPT) SENSOR PRESSURE SENSING CIRCUIT

Pinpoint Tests

PINPOINT TEST G531332p41 : MANIFOLD ABSOLUTE PRESSURE/TEMPERATURE (MAPT) SENSOR PRESSURE SENSING CIRCUIT

G531332t101 : CHECK THE POWER SUPPLY TO THE MAPT SENSOR
1. Key off.
2. Disconnect the MAPT connector, PI310.
3. Key on, engine off.
4. Measure the voltage between:

MAPT sensor connector Battery
PI310, harness side
Pin 02 Negative terminal

- Is the voltage greater than 4 volts?

-> YES
GO to Pinpoint Test G531332t102.

-> NO
CHECK the circuit between the MAPT sensor, pin 02 and the ECM. Refer to the warranty policy and procedures manual if an ECM is suspect.

G531332t102 : CHECK THE GROUND TO THE MAPT SENSOR
1. Key off.
2. Measure the resistance between:

MAPT sensor connector Battery
PI310, harness side
Pin 04 Negative terminal

- Is the resistance greater than 5 ohms?

-> YES
REPAIR the high resistance circuit. This circuit includes splice PIS49 and the ECM. CLEAR the DTC. TEST the system for normal operation. Refer to the warranty policy and procedures manual if an ECM is suspect.

-> NO
GO to Pinpoint Test G531332t100.

G531332t100 : CHECK THE MAPT PRESSURE SENSING CIRCUIT FOR SHORT CIRCUIT TO GROUND
1. Disconnect the ECM connector, PI300.
2. Measure the resistance between:

MAPT sensor connector Battery
PI310, harness side
Pin 01 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 G531332t103.

G531332t103 : CHECK THE MAPT PRESSURE SENSING CIRCUIT FOR SHORT CIRCUIT TO POWER
1. Measure the resistance between:

MAPT sensor connector Battery
PI310, harness side
Pin 01 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 G531332t104.

G531332t104 : CHECK THE MAPT PRESSURE SENSING CIRCUIT FOR HIGH RESISTANCE
1. Measure the resistance between:

MAPT sensor connector ECM connector PI300,
PI310, harness side harness side
Pin 01 Pin 69

- Is the resistance greater than 5 ohms?

-> YES
REPAIR the high resistance circuit. CLEAR the DTC. TEST the system for normal operation. Refer to the warranty policy and procedures manual if an ECM is suspect.

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