S4 Sedan L5-2226cc 2.22L DOHC Turbo (AAN) (1992)
Temperature Gauge: Testing and Inspection
Coolant Temperature Gauge and Warning Symbol, Checking
Coolant temperature gauge
Electronic Engine Coolant Temperature (ECT) thermal switch -F76-, terminal identification
+ -
Voltage supply
C -
Coolant overheat warning symbol control (Auto-Check system)
R -
A/C compressor cut off (overheat)
T -
Coolant temperature gauge control
Thermal switch located on coolant pipe behind right cylinder head.
-
Remove thermal switch connector.
-
Connect instrument/gauge tester VW 1301 to terminal T of thermal switch connector.
-
Set tester VW 1301 to 560.
-
Switch ignition ON.
-
Coolant temperature gauge needle must lie within tolerance range (arrows -A-)
-
Set VW 1301 to 58.
-
Coolant temperature gauge needle must lie within tolerance range (arrows -B-).
If NOT:
-
Check wiring for open circuit according to wiring diagram, repair as necessary.
-
Check voltage stabilizer.
If OK:
-
Replace coolant temperature gauge.
Coolant overheat warning symbol (in Auto-Check system)
-
Remove electronic thermal switch connector.
Thermal switch located on coolant pipe behind right cylinder head