111 12/04
SPIDER MAX 500
B
F. 94
Parameters
Immobilizer
Errors
Delete errors
Active Diagnostics
CO calibration
Main 5/8
Fuel pump relay
H.T. coil
Stepper motor
Rev. counter
Injector
Fan relay
Diagnosis 3/6
Check for the coolant temperature sensor signal.
Replace the central unit if necessary (see p. 94).
Repeat the test (p. 110).
Select the menu from the “ACTIVE DIAGNOSTICS” function.
Select the “STEPPER MOTOR” diagnosis.
Start the diagnosis with the engine idling and warm.
Make sure that the stepper motor controls the rpm change
and wait for the diagnostic multimeter reading.
Test ended with success.
Rpm change can be heard.
Test failed.
No rpm change.
The stepper motor and circuit operates
properly.
Test ended with success. No rpm change. Remove the throttle body (see chapter THERMAL
UNIT AND TIMING - Engine Manual).
Make sure the secondary intake air circuit is cleaned. Move the key switch from the “ON” to
the “OFF” position and then back to “ON” and check for the piston valve movement.
In case the valve does not move, replace the throttle body (see chapter
THERMAL UNIT AND TIMING - Engine Manual).
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