Test point 10: Troubleshooting:

Resistance values:

• Switch off ignition
• Disconnect plug connection X3/1
• Ohmmeter on pin 29 and pin 30 on the sleeve side

  Ohmmeter display at 20° C: approx. 1 KΩ

• Switch ignition on
• Measure voltage at plug connection X3/1 pin 29 and pin 30 on pin side

  Voltmeter display: approx. 5 V

• Switch off ignition
• Reconnect plug connection X3/1
• Remove connector of temperature sensor
• Pull off plugs I and II on the instrument cluster
• Switch ignition on
• Measure the voltage between instrument cluster plug II pin 5 and ground

  Voltmeter display: 0 V

• Measure the voltage between instrument cluster plug I pin 24 and ground

  Voltmeter display: 0 V

• Switch off ignition
• Ohmmeter on instrument cluster plug I pin 24 and plug on temperature sensor pin 2

  Ohmmeter display: < 5 Ω

• Ohmmeter on instrument cluster plug II pin 5 and plug on temperature sensor pin 3

  Ohmmeter display: < 5 Ω

• See also Test point 9  (Input signals, Coolant warning) and Coolant warning light  (Drive links).