Transmission RPM Sensor, Checking

Sensor for transmission RPM, checking (vehicles with 09A transmission)

Note: Sensor is located inside the transmission and is not accessible from the outside.

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:
- Engine Speed (RPM) Sensor -G28- must be OK, checking.
- Multi-Function Transmission Range (TR) Switch -F125- must be OK, checking.
- ATF level 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.

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 malfunction.
- Erase DTC memory of Transmission Control Module (TCM), Diagnostic mode 4: Reset/erase diagnostic data.
- Generate readiness code.

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.
- Check for open circuits in wires between test box and 20-pin harness connector according to wiring diagram.
Terminal 1 + socket 10
Terminal 2 + socket 9
Wire resistance: max. 1.5 ohms
Check wires for short circuit to each other, to vehicle Ground (GND) and to B+.
Specified value: infinte ohms

If no malfunctions are found in wires:
- Check resistance of Sensor for transmission RPM -G182-.

Check sensor resistance.
- Re-connect 20-pin connector.
- Check sensor resistance between test box sockets 9 + 10.
- Specified value: 400 to 600 ohms
- Check wires between test box sockets for short circuit to Ground (GND) and short circuit to B+ according to wiring diagram:
Sockets 1 + 9
Socket 1 + 10
Socket 9 + 68
Socket 10 + 68
Specified value: infinte ohms

If specified values are obtained:
- Replace Transmission Control Module (TCM) -J217-.

If specified values are not obtained:
- Check internal wires in valve body:

If no malfunctions are found in the internal wires:
- Replace Sensor for transmission RPM -G182-.
- Erase DTC memory of Transmission Control Module (TCM), Diagnostic mode 4: Reset/erase diagnostic data.
- Generate readiness code.