Charge Air Pressure Sensor 2/Intake Air Temperature Sensor 2, Checking

Charge Air Pressure Sensor 2/Intake Air Temperature Sensor 2, Checking

Observe all safety precautions: => [ Safety Precautions ] Generic Scan Tool

View clean working conditions: => [ Clean Working Conditions ] Clean Working Conditions

Use only gold-plated terminals when servicing any component with gold-plated electrical harness connector terminals.

For wiring diagrams, component locations, and connector views, Refer to the applicable wiring diagram.

Special tools, testers and auxiliary items required

• Multimeter

• Wiring diagram

• The Charge Air Pressure Sensor 2/Intake Air Temperature Sensor 2 (G447/G430)

• are co-located in the same housing. Replacement of either sensor will replace the other also.

Test requirements

• The Motronic 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 (GND) 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 with air filter. Refer to appropriate service information.





Test sequence

- Disconnect the Charge Air Pressure Sensor 2/Intake Air Temperature Sensor 2 (G447/G430) electrical harness connector - 1 -.





- Start engine and let it run at idle.

- Using a multimeter, check the Charge Air Pressure Sensor 2/Intake Air Temperature Sensor 2 (G447/G430) electrical harness connector terminals 3 to 4 for voltage.





Specified value: min. 4.5 V

- Switch the ignition off.

If the specification was obtained:

- Replace the Charge Air Pressure Sensor 2/Intake Air Temperature Sensor 2 (G447/G430).

If the specification was not obtained:

Checking wiring

If the manufacturers test box is being used, perform the following step.

- Install the test box.

If the manufacturers test box is not being used, perform the following step.

- Remove the Motronic Engine Control Module (ECM) (J623). Refer to appropriate service information.

- Using a multimeter, check the Charge Air Pressure Sensor 2/Intake Air Temperature Sensor 2 (G447/G430) electrical harness connector terminals to the Motronic Engine Control Module (ECM) (J623)electrical harness connector T94 terminals for an open circuit according to wiring diagram.









Specified value: 1.5 ohms max.

If the specification was not obtained:

- Check the wiring for a short circuit to each other, Battery (+), and Ground (GND).

- 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 if the voltage supply was OK:

- Replace the Charge Air Pressure Sensor 2/Intake Air Temperature Sensor 2 (G447/G430).

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

- Replace the Motronic Engine Control Module (ECM) (J623). Refer to appropriate service information.

- Install the engine cover with air filter. Refer to appropriate service 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.