Charge Air Pressure Sensor G31 , checking

WARNING: This page is about a different variant/trim than selected.

NOTE:

Use only gold-plated terminals when servicing terminals in harness connector of Charge Air Pressure Sensor G31.

Special tools, testers and auxiliary items required

Test requirements

The Motronic Engine Control Module (ECM) J220 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".

Test procedure

Perform a preliminary check to verify the customers complaint. Refer to → Motronic Engine Control Module (ECM) J220 , replacing

Start diagnosis

Remove the engine cover with air filter. Refer to 24 MULTIPORT FUEL INJECTION (MFI) for Engine Code AWD and 24 MULTIPORT FUEL INJECTION (MFI) for Engine Codes AWP and AWW .

Test sequence

Fig 1: Identifying 4-Pin Connector At Charge Air Pressure Sensor G31

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Disconnect the Charge Air Pressure Sensor G31 electrical harness connector - 2 -.
Start engine and let it run at idle.

Fig 2: Measuring Voltage Between Terminal 1 (Ground) And 3 (Positive) On Connector

Courtesy of VOLKSWAGEN UNITED STATES, INC.

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

Specified value: min. 4.5 V

If the specification was not obtained:

Checking wiring

If the manufacturers test box is being used. Perform the following step.

Install the test box Test Box 105 Pin VAG1598/31. Refer to 24 MULTIPORT FUEL INJECTION (MFI) for Engine Code AWD and 24 MULTIPORT FUEL INJECTION (MFI) for Engine Codes AWP and AWW .

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

Remove the Motronic Engine Control Module (ECM) J220. Refer to → Motronic Engine Control Module (ECM) J220 , replacing .

Fig 3: 4-Pin Electrical Harness Connector & Terminals

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Using a multimeter , check the Charge Air Pressure Sensor G31 electrical harness connector terminals to the Motronic Engine Control Module (ECM) J220 electrical harness connector T121 terminals for an open circuit according to wiring diagram.

Charge Air Pressure Sensor G31 electrical harness connector terminals	Motronic Engine Control Module (ECM) J220 electrical harness connector T121 terminals or test box sockets
3	98
4	101

Specified value: 1.5 Ω 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, lose or broken terminals.

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

Replace the Charge Air Pressure Sensor G31.
Erase the DTC memory. Refer to → Diagnostic Mode 04: Reset/delete diagnostic data
Perform a road test to verify repair.

If the DTC does not return:

Repair complete, Generate readiness code. Refer to →Readiness Code .

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

Replace the MFI Engine Control Module (ECM) J220. Refer to → Motronic Engine Control Module (ECM) J220 , replacing .
Assembly is performed in the reverse of the removal.

Final procedures

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

End diagnosis