Fuel Temperature Sensor, Checking
Fuel Temperature Sensor, Checking
NOTE: Use only gold-plated terminals when servicing terminals in harness connector.
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
Requirement
- The respective fuses of Diesel-Direct fuel injection system must be OK:
- Battery voltage must be at least 11.5 volts.
- For vehicles with automatic transmission, selector lever must be in -P-.
- Parking brake must be engaged.
- Ignition is switched off.
Test sequence
- Disconnect 2-pin connector (arrow) from Fuel Temperature Sensor -G81-.
- Measure resistance between sensor terminals.
See diagram for specified value
Range A displays resistance values for the temperature range of 0 to 65 degrees C, range B displays resistance values for the temperature range of 65 to 100 degrees C.
Read-out examples:
- 30 degrees C corresponds to a resistance of 3790 to 4270 Ohms
- 80 degrees C corresponds to a resistance of 600 to 660 Ohms
If specified value is not obtained:
- Replace Fuel Temperature Sensor -G81-.
- 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 specified value is obtained:
- Check wires to Engine Control Module (ECM) according to wiring diagram.
Check wires to control module
- Connect test box (1598/42) to Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) -J248- wiring harness using adapter cable (V.A.G 1598/39-1), connecting test box for wiring test. Test Box, Connecting For Wiring Test
- Check wires between test box and connector for open circuit according to wiring diagram.
Terminal 1 + socket 40
Terminal 2 + socket 39
Wire resistance: max. 1.5 Ohms
- Check wires for short circuit to each other, to vehicle Ground (GND) and to B+.
Specified value: Infinite Ohms
If no malfunctions are found in wires:
- Replace Diesel Direct Fuel Injection (DFI) Engine Control Module (ECM) -J248-.