Transmission Temperature Sensor/Switch: Testing and Inspection
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:
- 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.
- Ground (GND) connections to transmission must be OK.
- Ignition switched off.
Check Transmission Fluid Temperature Sensor
Vehicles with 01M transmission
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 4: Reset/Erase Diagnostic Data
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes
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. Test Box, Connecting For Wiring Test
- Measure resistance of Transmission Fluid Temperature Sensor -G93- at test box between sockets 6 + 67:
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: Infinite Ohms
If no malfunctions are found in wires:
- Replace circuit board with integrated Transmission Fluid Temperature Sensor -G93-
- Erase DTC memory of Transmission Control Module (TCM), Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 4: Reset/Erase Diagnostic Data
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes
Vehicles with 09A transmission
NOTE: Sensor is located inside the transmission and is not accessible from the outside.
Test sequence
- Disconnect 20-pin harness connector -2-.
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 4: Reset/Erase Diagnostic Data
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes.
If harness connector is OK:
- Check wires to Transmission Control Module (TCM) according to wiring diagram.
Checking wires to Transmission Control Module (TCM)
- Connect test box to control module wiring harness, connect test box for wiring test. Test Box, Connecting For Wiring Test
- Check for open circuits in wires between test box and 20-pin harness connector to Transmission Control Module (TCM) according to wiring diagram.
Terminal 7 + socket 33
Terminal 8 + socket 34
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:
- Check resistance of Transmission Fluid Temperature Sensor -G93-.
Check sensor resistance.
- Re-connect 20-pin connector.
- Measure resistance of Transmission Fluid Temperature Sensor -G93- at test box between sockets 33 +34:
- Check wires between test box sockets for short circuit to Ground (GND) and short circuit to B+ according to wiring diagram:
Socket 1 + 33
Socket 1 + 34
Socket 33 + 68
Socket 34 + 68
Specified value: Infinite Ohms
If specified values are obtained:
- Replace Transmission Control Module (TCM) -J217-.
If one of the specified values is not obtained:
- Check internal wire in valve body:
If no malfunctions are found in the internal wires:
- Replace Transmission Fluid Temperature Sensor -G93-.
- Erase DTC memory of Transmission Control Module (TCM), Diagnostic mode 4: Reset/erase diagnostic data. Diagnostic Mode 4: Reset/Erase Diagnostic Data
- Generate readiness code. Monitors, Trips, Drive Cycles and Readiness Codes