Passat L4-1984cc 2.0L DOHC (1991)
Temperature Gauge: Testing and Inspection
Engine Coolant Temperature (ECT) Gauge, checking/troubleshooting
Checking
If Fuel and Engine Coolant Temperature Gauges simultaneously indicate false readings, check voltage stabilizer.
Leave battery and electrical connectors connected for the following tests.
‹› check these first:
^ verify complaint
^ battery OK
^ chassis ground OK
^ fuse OK
^ remove connector from Engine Coolant Temperature (ECT) Sensor
^ connect lead A of VW 1301 to ground
^ connect lead B of VW 1301 to wire (yellow/red) leading to Engine Coolant Temperature Gauge
^ switch ignition ON
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Engine Coolant Temperature (ECT) warning light 1 flashes for approximately 3 seconds
^ adjust VW 1301 as follows:
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Engine Coolant Temperature Gauge needle must correspond to specified values
-
deviation of one needle width to the left or right is permissible
Troubleshooting