Charge Air Pressure Sensor, Checking

Charge Air Pressure Sensor (Vehicles With Engine Code ATW, AUG, AWM), Checking

Recommended special tools and equipment e.g.:
- VAG1526 multimeter or VAG1715 multimeter
- VAG1594 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 (VAG 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 test box to control module wiring harness, connect test box for wiring test. Test Box, Connecting For Wiring Test







- 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 short circuit to each other.

If no malfunctions are found in the wires and there was voltage between terminals 1+3:
- Check function

If no malfunctions 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, connect test box for wiring test. Test Box, Connecting For Wiring Test
- 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 Charge Air Pressure Sensor -G31-