Golf GTI L4-1984cc 2.0L DOHC (9A) (1990)
Engine Temperature Sensor: Customer Interest
MIL ON - Poor Idle/Stalls, Loss of Power, Exhaust Smoke
Group: 24
Number: 93-04
Date: November 15, 1993
Subject:
Engine Coolant Temperature (ECT) Sensor, replacing
Model(s):
All models with ECT Sensor all m.y.
Condition
A driveability problem can lead to the replacement of the Engine Coolant Temperature (ECT) Sensor when it in unnecessary to do so.
The following observations can lead to a suspected faulty ECT Sensor:
^
VAG 1551 Scan Tool indicates ECT Sensor is faulty
^
Malfunction Indicator Light is on
^
Vehicle loses power
^
Excessive visible exhaust smoke
^
Stalling and poor idle
Suspected ECT Sensor problems can be caused by:
^
Incorrect, disconnected or faulty wiring
^
Corroded terminals
^
Faulty input to Engine Control Module (ECM)
Service
Follow these steps to avoid unnecessary repairs when diagnosing suspected ECT Sensor problems:
-
Determine if problem is ECT Sensor related
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Check for correct connections at the ECT Sensor
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Check ECT Sensor wiring for damage
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Check that Ground connections are clean and make good contact
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Check ECT Sensor terminals (tin-plated) and clean with VW contact cleaner, Part No. G 000 700 04, or equivalent
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Check that terminals are properly installed in wiring connectors. Use appropriate wiring diagram
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Use VAG 1598 and digital multimeter Fluke 83 (US 1119) to check resistance of ECT Sensor circuit when engine is cold and again when engine is
hot.
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Road test vehicle to check performance.
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Check DTC Memory
-
Replace ECT Sensor if necessary
-
Road test vehicle