Charge Air Pressure Sensor/MAP Sensor, Checking

Charge Air Pressure Sensor/MAP Sensor, Checking

• Use only gold-plated terminals when servicing terminals in harness connector of Charge Air Pressure Sensor/MAP Sensor (G31/G71).

Special tools, testers and auxiliary items required

• Multimeter.

• Wiring diagram.

Test requirements

• The Engine Control Module (ECM) (J623) fuses OK.

• Battery voltage at least 12.5 volts.

• All electrical consumers such as, lights and rear window defroster, switched off.

• On vehicles with automatic transmission, selector lever in position "P" or "N".

• A/C switched off.

• Ground connections between engine/transmission/chassis OK.

• Ignition switched OFF.

Test procedure

- Perform a preliminary check to verify the customers complaint. Refer to => [ Preliminary Check ] Preliminary Check

Start diagnosis

- Remove the engine cover. Refer to the repair information.

Test sequence

- Disconnect the Charge Air Pressure Sensor/MAP Sensor (G31/G71) electrical harness connector - arrow -.






- Start the engine.

- Using a multimeter, check the Charge Air Pressure Sensor/MAP Sensor (G31/G71) electrical harness connector terminals 1 to 3 for voltage.






Specified value: min. 4.5 V

- Switch the ignition OFF.

Checking wiring

- Remove the Engine Control Module (ECM) (J623). Refer to the repair information.

- Using a multimeter, check the Charge Air Pressure Sensor/MAP Sensor (G31/G71) electrical harness connector terminals to the Engine Control Module (ECM) (J623) electrical harness connector terminals for an open circuit according to wiring diagram.






Specified value: 1.5 ohms max.

If the specified value was Not obtained:

- Check the wiring for an open, high resistance or short to ground.

- If necessary, repair the faulty wiring connection.

- Check the electrical harness connector for damage, corrosion, loose or broken terminals.

If no malfunction is detected in the wiring and the voltage supply was OK:

- Replace the Charge Air Pressure Sensor/MAP Sensor (G31/G71) Refer to the repair information.

If no malfunction is detected in the wiring and the voltage supply was Not OK:

- Replace the Engine Control Module (ECM) (J623). Refer to the repair information.

- Install the engine cover. Refer to the repair information.

Final procedures

After the repair work, the following work steps must be performed in the following sequence:

1. Check the DTC memory. Refer to => [ Diagnostic Mode 03 - Read DTC Memory ] Diagnostic Modes 01 - 09.

2. If necessary, erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Modes 01 - 09.

3. If the DTC memory was erased, generate readiness code. Refer to => [ Readiness Code ] Monitors, Trips, Drive Cycles and Readiness Codes.