Vehicle Speed Sensor (VSS), Checking

Vehicle Speed Sensor (VSS), 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.

Work sequence







- Disconnect 3-pin harness connector to Vehicle Speed Sensor (VSS) -G68- (arrow).
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.
- Measure resistance at 3-pin connector of Vehicle Speed Sensor (VSS) -G68-.

Checking sensor resistance







- Measure sensor resistance between terminals 1 + 2 at connector to sensor.

Specified value: 800 to 900 Ohms

- Check sensor for short circuit between terminals 2 + 3 and 1 + 3.

Specified value: Infinite Ohms

If specified values are not obtained:
- Replace Vehicle Speed Sensor (VSS) -G68-.
- 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 no malfunction is found on sensor:
- 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 wires between test box and 3-pin connector to Transmission Control Module (TCM) for open circuit according to wiring diagram.

Terminal 1 + socket 65
Terminal 2 + socket 20
Terminal 3 + socket 43

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 Transmission Control Module (TCM) -J217-.