Exhaust Temperature Sensor: Testing and Inspection

Sensor For Exhaust Temperature, Checking (vehicles With Engine Code BBW)

NOTE:
- Vehicle must be raised before connector for sensor for exhaust temperature is accessible.
- When servicing terminals in harness connector of sensor for exhaust temperature, use only gold-plated terminals.

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

Requirements







- The respective fuses of Motronic Engine Control Module (ECM) -J220- must be OK.
- Fuel Pump (FP) relay -J17- must be OK, check:
- Battery voltage must be at least 11.5 Volts.
- All electrical consumers such as, lights and rear window defroster must be switched off.
- Parking brake must be engaged or else daylight driving lights will be switched on.
- If vehicle is equipped with an A/C system, it must be switched off.
- Ground (GND) connections between engine and chassis must be OK.

Work sequence







- Remove protective cover -1- and disconnect 2-pin harness connector (black) -2- from Exhaust Gas Temperature (EGT) sensor 1 -G235-.







- Connect multimeter between connector terminal 1 (B+) and 2 (Ground (GND)) for voltage measurement.
- Switch ignition on.

Specified value: at least 4.5 V

- Switch ignition off

If there is no voltage:
- Connect test box to control module wiring harness, connect test box for wiring test. Test Box, Connecting For Wiring Test







- Check wires between test box and 2-pin connector for open circuit according to wiring diagram.

Terminal 1 + socket 31
Terminal 2 + socket 50

Wire resistance: max. 1.5 Ohms

- Check wires for short circuit to each other.

Specified value: Infinite Ohms

If no errors are found in wires and there was voltage between terminals 1 + 2.
- Replace Exhaust Gas Temperature (EGT) sensor 1 -G235-.
- 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 + 2:
- Replace Motronic Engine Control Module (ECM) -J220-.