Coolant Temperature Gauge And Warning, 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 VOLTAGE STABILIZER AND FUEL GAUGE, CHECKING .
If OK:
-- Replace coolant temperature gauge.
Coolant Overheat Warning Symbol in Auto-Check System
-- Electronic engine coolant temperature thermal switch -F76- terminal identification INSTRUMENT CLUSTER CONNECTORS, TERMINAL IDENTIFICATION .
-- Remove electronic thermal switch connector.
Thermal switch located on coolant pipe behind right cylinder head
-- Using a jumper wire, connect terminal C of thermal switch connector to ground.
-- Start engine.
- Warning symbol must be displayed after approx. 30 seconds (warning chime sounds)
If NOT:
-- Check wiring for open circuit according to wiring diagram, repair as necessary.
If wiring checks OK:
-- Replace printed circuit board in instrument cluster.