Transmission Fluid Temperature Sensor, Checking
Transmission Fluid Temperature Sensor, Checking
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
- Respective fuses must be OK: Electrical Wiring Diagrams, Troubleshooting & Component Locations
- Selector lever must be in -P- position.
- 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.
- Ground (GND) connections to transmission must be OK.
- Ignition switched off.
Test sequence
- Disconnect 12-pin harness connector at transmission.
Observe safety precautions.
- Check harness connector for contact corrosion and ingress of water.
If harness connector is not OK:
- Repair the malfunction.
- Erase DTC memory of Transmission Control Module (TCM), Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 04 - Erase DTC Memory
- Generate readiness code.
If harness connector is OK:
Check resistance of Transmission Fluid Temperature Sensor -G93-.
Check sensor resistance.
- Re-connect 12-pin connector.
- Connect test box to control module wiring harness, connect test box for wiring test.
- Measure resistance of Transmission Fluid Temperature Sensor -G93- at test box between sockets 6 + 67:
ATF temperature Specified value
approx. 20 degrees C 230.0 to 265.0 K ohms
approx. 60 degrees C 37.0 to 51.0 K ohms
approx.120 degrees C 5.0 to 9.0 K ohms
If one of the specified values is not obtained:
- Check wires to Transmission Control Module (TCM) according to wiring diagram.
Checking wires to Transmission Control Module (TCM)
- Disconnect 12-pin harness connector at transmission.
- Check wires between test box and 12-pin connector to Transmission Control Module (TCM) for open circuit according to wiring diagram.
Terminal 1 + socket 67
Terminal 12 + socket 6
Wire resistance: max. 1.5 ohms
- Check wires for short circuit to each other, to vehicle Ground (GND) and to B+.
Specified value: infinity ohms
If no malfunctions are found in wires:
- Replace circuit board with integrated Transmission Fluid Temperature Sensor -G93-: valve body, removing and installing
- Erase DTC memory of Transmission Control Module (TCM), Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 04 - Erase DTC Memory
- Generate readiness code.