Charge Air Pressure Sensor, Checking

Charge Air Pressure Sensor, Checking

Recommended Special Tools, Workshop Equipment, Testers, Measuring Instruments and Auxiliary Items
- V.A.G 1526 portable multimeter or V.A.G 1715 multimeter
- Adapter set V.A.G 1594
- Wiring diagram

Voltage Supply and Wiring to Control Module, Checking
- Switch off ignition.
- Disconnect connector at Charge Air Pressure Sensor.







- Use adapter cables from (V.A.G 1594) to connect multimeter to terminals 1 + 3 of connector for voltage measurement.
- Switch ignition on.
Specification: at least 4.5 V

- Switch off ignition.

If specified value is not obtained, check wire connections to ECM.







- Connect V.A.G 1598/31 test box to control module wiring harness. Test Box, Connecting For Wiring Test The engine control module remains disconnected.
- Check wiring harness between test box and connector for open circuit according to wiring diagram.

Terminal 1 + Socket 108

Terminal 3 + Socket 98

Terminal 4 + Socket 101







Wiring resistance: max. 1.5 Ohms

- Check wires for short circuit to each other.

If no malfunctions are found in wires and there was no voltage between terminals 1 + 3:
- Replace Motronic Engine Control Module (ECM) -J220-.
- Erase DTC memory of ECM, Diagnostic Mode 04 - Erase DTC Memory diagnostic mode 4: Reset/erase diagnostic data.
- Generate readiness code. Readiness Code, Generating

If no malfunctions are found in wires and voltage was present between terminals 1 + 3:
- Check signal wire.

Signal Wire, Checking
- Connect test box to control module wiring harness. Test Box, Connecting For Wiring Test ECM should also be connected.
- Connect electrical connector to Charge Air Pressure Sensor -G31- again.
- Connect multimeter to test box sockets 101 and 108 for voltage measurement.
- Start engine and let it run at idle.
- Measure voltage.

Specified value: 1.80 to 2.00 volts

- Increase engine speed by pressing gas pedal suddenly.

Specified value: 2.00 to 3.00 volts







If specified values are not reached, check wire connection to ECM for open circuit and short circuit to Ground (GND) or B+.

Terminal 4 + Socket 101
- Correct open circuit or short circuit.

If no malfunction is found in wire.
- Check Charge Air Pressure Sensor -G31-.
- Erase DTC memory of ECM, Diagnostic Mode 04 - Erase DTC Memory diagnostic mode 4: Reset/erase diagnostic data.
- Generate readiness code. Readiness Code, Generating