Downstream Solenoid Test - Jeep 1987 Wrangler Workshop Manual

ENGINES
FUEL FEEDBACK SYSTEMS
DIAGNOSTIC T E S T 7
DOWNSTREAM S O L E N O I D T E S T
NOTE: WHEN APPLICABLE, DIAGNOSTIC
CONNECTOR TERMINALS CAN BE USED AS TEST
POINTS INSTEAD OF MCU CONNECTOR TERMINALS.
S E E
I.S.
N
O
T
E
S
DETERMINE IF MANIFOLD VACUUM IS PRESENT AT PORT E OF DOWNSTREAM AIR
SWITCH SOLENOID.
SUPPLY MANIFOLD VACUUM AND START
TEST OVER.
1 URN ICNITION ON AND TEST FOR BATTERY VOLTAGE AT YELLOW WIRE TERMINAL OF
SOLENOID CONNECTOR.
REPAIR AND RETEST
NO / VOLTAGE^
X
OK
l
YES
TURN IGNITION OFF. DISCONNECT MCU CONNECTOR. WITH OHMMETER,
MEASURE THE RESISTANCE BETWEEN MCU CONNECTOR PIN 1 (+ PROBE)
AND MCU CONNECTOR PIN 46 (- PROBE).
YES
CONNECT MCU CONNECTOR
IF RESISTANCE IS LESS THAN 50 OHMS,
DISCONNECT DOWNSTREAM SOLENOID WIRE
CONNECTOR AND TEST RESISTANCE BETWEEN
MCU CONNECTOR PIN 1 AND CONNECTOR
PIN 46.
DISCONNECT WIRE CONNECTOR FROM
DOWNSTREAM SOLENOID. WITH APPROPRIATE
LENGTH OF JUMPER WIRE, TEST CONTINUITY
BETWEEN ORANGE WIRE TERMINAL AND MCU
CONNECTOR PIN 46.
CONT'D.
CONT'D.
CONT'D.
83085K(J)
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