Motronic MED 9.1
Engine CoolantTemperature (ECT)
Sensor G62
This sensor is located at the coolant distributor above
the oil filter on the engine and it informs the ECM
of the coolant temperature. Situated at the engine
outlet, G62 measures the highest temperature of the
coolant.
Signal Utilization
The coolant temperature is used by the ECM
for different engine functions. For example, the
computation for the injection amount, compressor
pressure, start of fuel delivery and the amount of
exhaust gas recirculation.
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Effects of Signal Failure
G62
If the signal fails, the ECM uses the signal from the
ECT Sensor G83.
Radiator
Inlet
Engine CoolantTemperature (ECT)
Sensor (on the Radiator) G83
The ECT Sensor (on the Radiator) G83 is located in
the radiator output line and measures the coolant exit
temperature. This is the lowest coolant temperature
in the system.
Signal Utilization
The radiator fan is activated by comparing both
signals from the ECT Sensors G62 and G83.
Radiator
Outlet
Effects of Signal Failure
If the signal from the ECT Sensor G83 is lost, the first
speed engine coolant fan is activated permanently.
G83
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