Jeep 1987 Wrangler Workshop Manual page 507

ENGINES
FUEL FEEDBACK SYSTEMS
CONTINUED
FROM PREVIOUS
PAGE
TURN ENGINE OFF DISCONNECT HARNESS CONNECTORS AT MCU
TEST RESISTANCE BETWEEN MCU HARNESS CONNECTOR PIN 1
AND MCU HARNESS CONNECTOR PINS 10. 50. 48 AND 49
SEE
I.S.
N
O
T
E
S
NO
REPEAT RESISTANCE TEST USING PIN 20 OF
CONNECTOR INSTEAD OF PIN 1.
ALL RESISTANCES SHOULD BE BETWEEN 50 AND
95 OHMS.
NO
REMOVE STEPPER MOTOR
AND INSPECT FOR
EVIDENCE OF PIN BINDING.
CONNECT MCU HARNESS.
WITH STEPPER MOTOR
REMOVED, TURN ENGINE
ON, OBSERVE PIN
MOVEMENT.
WHEN ENGINE IS FIRST
TURNED ON, STEPPER
MOTOR PINS MOVE TO FULL
FORWARD (RICH) POSITION
THEN BACK TO HALF-WAY
POSITION.
TURN IGNITION ON AND DISCONNECT STEPPER
MOTOR CONNECTOR
TEST FOR BATTERY VOLTAGE AT PIN 5 OF THE
STEPPER MOTOR CONNECTOR.
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 BETWEEN MCU
CONNECTOR PINS 10, 50, 48 AND 49 AND
APPROPRIATE PINS AT STEPPER MOTOR
CONNECTOR. INSPECT STEPPER MOTOR
CONNECTOR FOR CORRECT COLOR ORIENTATION
OF WIRES.
CONT'D
CONT'D.
83085E(J)
B-273