Turbo Boost Sensor: Testing and Inspection

Charge Air Pressure Sensor, Checking

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

Test requirements







- The respective fuses of Charge Air Pressure Sensor -G31- must be OK.
- Fuel Pump (FP) Relay -J17- must be OK, check.
- Ground (GND) connections between engine and chassis must be OK.
- Ignition switched off.

Test sequence







- Disconnect 4-pin connector -2- from Charge Air Pressure Sensor -G31- (-1-).

Checking voltage supply and wiring to control module







- Connect multimeter with test leads to terminals 1+3 connector for voltage measurement.
- Switch ignition on.

Specified value: at least 4.5 V

- Switch ignition off.

If specified value is not obtained:
- Check wires to control module according to wiring diagram.

Check wires to control module
- Connect test box to control module wiring harness. connect test box for wiring test. Test Box, Connecting For Wiring Test

Vehicles with engine code APH, AWP, AWV







- Check wires between test box and 4-pin connector to Engine Control Module (ECM) for open circuit according to wiring diagram.

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

Wire resistance: max. 1.5 Ohms

Vehicles with engine code BKF, BNU







- Check wires between test box and 4-pin connector to Engine Control Module (ECM) for open circuit according to wiring diagram.

Terminal 1 + socket 27
Terminal 3 + socket 53
Terminal 4 + socket 49

Wire resistance: 1.5 Ohms

Continue for all vehicles
- Check wires for short circuit to each other.

Specified value: Infinite Ohms

- Erase DTC memory of Engine Control Module (ECM). Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 4: Reset/Erase Diagnostic Data
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes

If no malfunctions are found in the wires and there was voltage between terminals 1+3:
- Replace Charge Air Pressure Sensor -G31-.
- Erase DTC memory of Engine Control Module (ECM). Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 4: Reset/Erase Diagnostic Data
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes

If no errors are found in wires and there was no voltage between terminals 1+3:
- Replace Motronic Engine Control Module (ECM) -J220-.