Sensor Check And Control Unit Check - Jeep 1987 Wrangler Workshop Manual

ELECTRICAL
IGNITION SYSTEM - MOTORCRAFT (6-Cyl. Engine)
SENSOR CHECK AND CONTROL UNIT CHECK
Chart 3
STEP
SEQUENCE
RESULT
m DISCONNECT
4-WIRE
CONNECTOR
AT CONTROL
UNIT
# DISCONNECT COIL WIRE
FROM CENTER TOWER OF
DISTRIBUTOR AND HOLD
1/2 - INCH FROM ENGINE
WITH INSULATED PLIERS
SPARK AT
COIL WIRE «
(NORMAL)
NO SPARK
©
DISCONNECT J2 CONNECTOR
FROM MCU AND CONNECT
OHMMETER TEST LEADS TO
PINS 3 AND S O F MCUD J2
CONNECTOR
O K
OHMMETER INDICATES
400 800 OHMS (NORMAL)
OHMMETER
DOES NOT
INDICATE
400 800 OHMS
o
6
»DISCONNECT ANO
RECONNECT
3 • WIRE CONNECTOR
AT DISTRIBUTOR
OHMMETER
NOW INDICATES-
4W • 800 OHMS
OHMMETER
REMAINS OUTSIDE
400 - 800 OHMS
DISCONNECT
3 WIRE
CONNECTOR
AT DISTRIBUTOR
840249
C-89