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Nexus 500
YES go to 3 NO go to 4
3 - Start the engine and let it warm up.
With a coolant temperature of more than 70°C, the
control unit must control the Stepper with about 45
«steps».
YES go to 5 NO go to 4
4 - Check the coolant temperature sensor signal. Check the control unit, if necessary.
5 - Select the menu on the «ACTIVE DIAGNOSIS» function. Select «STEPPER» diagnosis. Start the
diagnosis with idle engine at the working temperature. Check whether the Stepper controls some rev-
olution variations and wait for the diagnostic tester response.
N.B.
THE ECU ENABLES THE DIAGNOSIS ONLY WHEN THE IDLE SPEED IS WITHIN THE SPECIFI-
CATIONS.
YES go to 6 NO go to 8
6 - Test successful. Variations of revolutions perceived.
YES go to 7 NO go to 9
7 - Stepper and relevant circuit efficient.
8- Test failed. No variations of revolutions. Check the Stepper circuit. Disconnect the Stepper connector.
Check the resistance of the Stepper circuits by connecting the tester as indicated in the figure. The two
measurements must have the same value.
Electric characteristic
Injection
INJEC - 279
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