Mitsubishi 3000GT 1991 Service Manual page 218

FUEL SYSTEM - 0
HARNESS INSPECTION
Connector
connector
n-vehicle Inspection of MPI Components
Measure the power supply voltage of
idle speed control servo.
Idle speed control servo connec-
l
tor: Disconnected
Ignition switch: ON
l
Check for an open-circuit, or a short-
circuit to ground between the engine
control unit and the idle speed control
servo.
Engine control unit connector:
l
Disconnected
l
ACTUATOR I'NSPECTION
Checking the Operation Sound
heard after the ignition is switched ON (but without starting
the motor).
(2) If the operation sound cannot be heard, check the stepper
motor's activation circuit.
If the circuit is normal, it is probable that there is a
malfunction of the stepper motor or of the engine control
unit.
Revision
TSB