Transmission Temperature Sensor/Switch: Testing and Inspection
Transmission Fluid Temperature Sensor, Checking
Recommended Special Tools, Workshop Equipment, Testers, Measuring Instruments and Auxiliary Items
- V.A.G 1526 portable multimeter or V.A.G 1715 multimeter.
- Adapter set V.A.G 1594
- Wiring diagram
Test Conditions
- Respective fuses must be OK
- Battery voltage must be at least 11.5 V.
- All electrical consumers such as, for example, lights and rear window defroster must be switched off.
- The parking brake must be applied, otherwise the daytime running lights are switched on.
- The Ground (GND) connections to transmission must be OK.
- Selector lever must be in "P" position.
- Ignition switched off.
Test Sequence
- Disconnect 8-pin connector - B -.
- Observe safety precautions.
- Check harness connector for contact corrosion and ingress of water.
- If harness connector is not OK:
- Repair the problem.
- Erase DTC memory of TCM. Diagnostic Mode 04 - Erase DTC Memory
- Generate readiness code. Generate Readiness Code
If harness connector is OK:
- Check resistance of Transmission Fluid Temperature Sensor -G93-.
- Check Sensor Resistance
- Measure resistance of Transmission Fluid Temperature Sensor -G93- between terminals 1+2 on connector to sensor:
ATF-Temperature Specified value
approx. -30 degrees C 37.0 to 51.0 K Ohms
approx. 10 degrees C 5.0 to 8.0 K Ohms
approx. 25 degrees C 3.0 to 5.0 K Ohms
approx. 110 degrees C 230.0 to 265.0 Ohms
approx. 145 degrees C 100.0 to 120.0 Ohms
If one of the specified values is not attained:
- Replace Transmission Fluid Temperature Sensor -G93-.
- Erase DTC memory of TCM. Generate Readiness Code
- Generate readiness code. Generate Readiness Code
If the specified values are achieved:
- Check wiring to TCM according to wiring diagram.
- Wiring to TCM, Checking
- Connect test box to control module wiring harness. Test Box, Connecting For Wiring Test
- Check wires between test box and 8-pin connector to Transmission Control Module (TCM) for open circuit according to wiring diagram.
- Terminal 1 + Socket 45
- Terminal 2 + Socket 8
- Wiring resistance: max. 1.5 Ohms
- Also check wires for short circuit to each other.
- Specification: Infinite Ohms
- If no fault is detected in the wiring:
- Replace Transmission Control Module (TCM) -J217-.