Coolant Temperature Sensor
NOTE:
Vanagon models use a temperature sensor located in cylinder head. Any reference made to coolant temperature sensor within this article also applies to the Vanagon temperature sensor.
This sensor provides ECU with engine temperature information relating to warm-up enrichment operation. During warm-up period after a cold engine start, additional fuel is required to maintain engine performance. As engine temperature increases, the ECU decreases fuel enrichment until engine reaches normal operating temperature.