Checking Engine Coolant Temperature Sensor on Radiator - Procedure
If no malfunction is detected in wiring:
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Measure resistance at Engine Coolant Temperature (ECT) Sensor G83.
Range A displays resistance values for the temperature range of 0 to 50 degrees C, range B displays resistance values for temperature range of 50
to 100 degrees C.
Example:
-30 degrees C lies in range A and represents a resistance of 1.5 to 2.0 kOhms
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80 degrees C lies in range B and represents a resistance of 275 to 375 kOhms
If specification is not obtained:
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Replace Engine Coolant Temperature (ECT) Sensor G83.
CAUTION:
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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 for Motronic engine control module J220. See: Computers and Control Systems/Testing and Inspection/Scan Tool Testing
and Procedures/With Generic Scan Tool/Diagnostic Mode 4: Reset/Erase Diagnostic Data
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Generate readiness code. See: Computers and Control Systems/Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness
Codes/Readiness Code, Generating
If no malfunctions are detected in the wires and resistance values are OK:
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Replace Motronic Engine Control Module (ECM) J220.