Manufacturer's Scan Tool
Engine Speed Sensor, Checking
Special tools, testers and auxiliary items required
• (VAG1526A)
• (VAG1594A)
• (VAG1598/31)
• The engine speed sensor is a combined speed sensor and reference mark sensor. The engine cannot be started without a signal from the Engine speed (RPM) sensor (G28). If the signal from the Engine speed (RPM) sensor (G28) fails while the engine is running, the engine will cut out immediately.
Test sequence
- Before performing test, make sure that sensor is correctly installed and firmly seated.
- Disconnect connector to engine speed sensor => [ Identification of connector bracket - left side
of vehicle ] Locations
- Connect multimeter between terminals 2 and 3 to measure resistance.
• Specified value: 730 to 1000 ohms
• The resistance value of the engine speed sensor is associated with a temperature of 20 °C. The resistance increases if the temperature increases.
If specified value is not attained:
- Install a new engine speed sensor.
If specified value is attained:
- Connect multimeter between terminals 2 and 1 (screen) and 3 and 1 (screen) to measure resistance.
• Specified value: each case infinite ohms (no continuity)
If specified value is not attained:
- Install a new engine speed sensor.
If specified value is attained:
- Connect test box (VAG1598/31) to wiring harness for engine control module; do not connect engine control module. Refer to => [ Wiring and Component Check with Test Box VAG 1598/31 ] Wiring and Component Check With Test Box VAG 1598/31.
- Check for open circuit and short to positive or ground in following wiring connections:
- Repair any open/short circuit as necessary.
If no wiring malfunction is detected:
- Replace engine control module:
• With anti-theft housing. Refer to => [ Engine Control Module with Metal Anti-Theft Housing ] Engine Control Module With Metal Anti-Theft Housing.
• Without anti-theft housing. Refer to => [ Engine Control Module without Metal Anti-Theft Housing ] Engine Control Module Without Metal Anti-Theft Housing.