Charge Air Pressure Sensor, Checking

Charge air pressure sensor, checking

Recommended special tools and equipment e.g.:
- VAG 1526 multimeter or VAG 1715 multimeter
- VAG 1594 connector test kit
- Wiring diagram

Checking voltage supply and wiring to control module

- Switch ignition off.






- Disconnect 4-pin connector -2- from charge air pressure sensor -G31-, -1-.






- Use adapter cables from V.A.G 1594 to connect multimeter to terminals 1 & 3 of connector for voltage measurement.

- Switch ignition on.

Specified value: at least 4.5 V

- Switch ignition off.

If specified value is not obtained:






- Connect VAG 1598/31 test box to control module wiring harness. Engine Control Module (ECM) is not connected.






- Check for open circuits in wires between test box and connector according to wiring diagram.

Terminal 1&socket 108
Terminal 3 & socket 98
Terminal 4 & socket 101

Wire resistance: max: 1.5 Ohms

- Check wires for shorts among one another.

If no malfunctions are found in the wires and there was voltage between terminals 1 & 3:

- Check function.

If no errors are found in wires and there was no voltage between terminals 1 & 3:

- Replace Motronic Engine Control Module (ECM) -J220-.

Checking function

- Connect test box to control module wiring harness.

- Re-connect connector at charge air pressure sensor -G31-.

- Connect multimeter to socket 101 and socket 108 for voltage measurement.

- Start engine and measure voltage.

Specified value: 1.80 to 2.00 volts

- Bring engine to RPM by depressing accelerator pedal suddenly.

Specified value: 2.00 to 3.00 volts

If specified values are not obtained:

- Replace the charge air pressure sensor -G31-.