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Home >> Audi >> 2012 >> A6 Sedan (4G2) L4-2.0L Turbo (CAEB) >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Testing and Inspection >> Component Tests and General Diagnostics >> Charge Air Pressure Sensor, Checking
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Charge Air Pressure Sensor, Checking







Charge Air Pressure Sensor, Checking

Observe all safety precautions: => [ Safety Precautions ] Safety Precautions

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

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






- Disconnect the connector -1- from the Mass airflow sensor (G70) , and remove the Air Filter Housing. Refer to appropriate service manual.






Test sequence

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






- Start engine and let it run at idle.

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






Specified value: near 5.0 V

- Switch the ignition OFF.

- Continue test according to the following table:






Checking wiring

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

- Using a Multimeter, Check the Charge Air Pressure Sensor (G31) electrical harness connector to the Motronic Engine Control Module (ECM) electrical harness connector T60 for an open circuit.











Specified value: 1.5 ohms Max.

If the specified value was Not obtained:

- Check the wiring connection for an open circuit, short circuit to Battery positive or Ground

- Check the wiring connection for damage, corrosion, loose or broken terminals.

- If necessary, repair the faulty wiring connection.

- Go to Final procedures

If the specified value was obtained:

- With the Motronic Engine Control Module (ECM) Connectors still unplugged (J623). Refer to appropriate service manual.

- Use a Multimeter, Check the Charge Air Pressure Sensor (G31) electrical harness connector terminal 1 to engine ground for continuity

If Specified value is 1.5 ohms or less

- Check the wiring connection for a short circuit to Engine Ground

- If necessary, repair the faulty wiring or connection, If no faults were found Replace the Motronic Engine Control Module (ECM) (J623). Refer to appropriate service manual.

- Go to Final procedures

Checking wiring

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

- Using a Multimeter, Check the Charge Air Pressure Sensor (G31) electrical harness connector to the Motronic Engine Control Module (ECM) (J623) electrical harness connector T60 for an open circuit.











Specified value: 1.5 ohms Max.

If the specified value was Not obtained:

- Check the wiring connection for an open circuit, short circuit to Battery voltage or Ground

- Check the wiring connection for damage, corrosion, loose or broken terminals.

- If necessary, repair the faulty wiring connection.

- Go to Final procedures

If the specified value was obtained:

- Replace the Charge Air Pressure Sensor (G31). Refer to appropriate service manual.

Final procedures

- Reinstall the engine cover and air filter housing, if necessary. Refer to the appropriate service manual.

- 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 - 0A.

2. If necessary, erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Modes 01 - 0A.

3. If the DTC memory was erased, generate readiness code. Refer to => [ Readiness Code ] Programming and Relearning.


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