Jeep J-10 Series 1982 Technical & Service Manual page 431

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CONTINUED
FROM PREVIOUS
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TURN OFF IGNITION AND TEST RESISTANCE
BETWEEN PIN 20 AND PINS 23, 24, 21 AND 22 AT
MCU HARNESS CONNECTOR.
NO
REPEAT RESISTANCE TEST USING PIN 14 INSTEAD
OF 20. ALL RESISTANCES SHOULD BE EQUAL TO OR
SLIGHTLY HIGHER THAN THOSE INDICATED IN PRE
VIOUS TEST.
NO
REMOVE STEPPER MOTOR
AND INSPECT FOR
EVIDENCE OF PIN BINDING.
WITH MOTOR REMOVED,
TURN IGNITION ON,
OBSERVE PIN MOVEMENT.
WHEN IGNITION IS FIRST
TURNED ON, STEPPER
MOTOR PINS MOVE TO
FULL FORWARD (RICH)
POSITION THEN BACK TO
HALF-WAY POSITION.
CONTD.
FUEL SYSTEMS U-l 17
TURN IGNITION ON AND DISCONNECT STEPPER
MOTOR CONNECTOR.
TEST FOR BATTERY VOLTAGE AT PIN 5 OF THE
STEPPER MOTOR CONNECTOR.
NO
TURN IGNITION OFF AND TEST FOUR REMAINING
STEPPER MOTOR CONNECTOR PINS FOR SHORT TO
GROUND. ALL SHOULD INDICATE AN OPEN CIRCUIT
(INFINITE RESISTANCE).
NO
TEST FOR CONTINUITY FROM PINS 23,24.21 AND 22
AT MCU CONNECTOR TO APPROPRIATE PINS AT
STEPPER MOTOR CONNECTOR. INSPECT STEPPER
MOTOR CONNECTOR FOR CORRECT COLOR
ORIENTATION OF WIRES.
CONTD.
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