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Install the electronic control unit interface wiring.
Start the engine and warm it up until the electric
fan switches on.
Use an analogue multimeter with a direct voltage
scale measuring down to 2V.
Place the multimeter probes between pins 4 (-)
and 11 (+)
With the engine running at idle speed, check that
the voltage oscillates between 0V and 1V
With the throttle valve fully open, the voltage is ~
During the closing phase, the voltage is ~ 0V.
If the voltage remains constant, the sensor may be
damaged. Remove the sensor and check that
there are no oil or carbon deposits in it.
INJEC - 186


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