Passat Sedan 4Motion W8-4.0L (BDP) (2002)
approx. -40 degrees C
Open circuit or short circuit to B+
approx. 140 degrees C
Short circuit to Ground (GND)
1) If a temperature is indicated which differs greatly from ambient temperature of sensor, check sensor wires for contact resistance.
If specified value is obtained:
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Start engine and let run at idle. The temperature must climb uniformly
NOTE:
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The temperature increases in increments of 1.0 degrees C.
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If the engine shows problems in certain temperature ranges and the temperature does not climb uniformly, the temperature signal is intermittent
and the sensor must be replaced.
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Switch ignition off.
Continuation of test if indication is approx. -40 degrees C:
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Disconnect 2-pin connector from Engine Coolant Temperature (ECT) Sensor -G62- (arrow).
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Bridge terminals 1 + 2 of connector using the respective adapter cables and observe the indication on display.
If indication jumps to approx. 140 degrees C:
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End diagnostic and switch ignition off.
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Remove intake air hose between Mass Air Flow (MAF) sensor and throttle valve control module, item 1 .
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Replace Engine Coolant Temperature (ECT) Sensor -G62-.
WARNING:
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Cooling system is under pressure.
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Danger of scalding when opening!
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Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data.
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Generate readiness code. See: Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness Codes
If indication remains at approx. -40 degrees C:
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End diagnostic and switch ignition off.
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Check wires according to wiring diagram.
Continuation of test if indication is approx. 140 degrees C: