Jeep 1987 Wrangler Workshop Manual page 510

ENGINES
FUEL FEEDBACK SYSTEMS
S E E
I.S.
N
O
T
E
S
CONTINUED
F R O M PREVIOUS
PAGE
TEST CONTINUITY BETWEEN DIAGNOSTIC
CONNECTOR D2 PIN 9 AND MCU
CONNECTOR PIN 55.
DISCONNECT VACUUM
SUPPLY HOSE FROM
VACUUM SWITCH 1.
TEST CONTINUITY BETWEEN
DIAGNOSTIC CONNECTOR D2
PIN 3 TO MCU CONNECTOR
PIN 20.
YES
REPAIR VACUUM
MALFUNCTION AND
RETEST.
DISCONNECT
AND RETEST
TEST FOR CONTINUITY
BETWEEN DIAGNOSTIC
CONNECTOR D2 PIN 9
AND VACUUM SWITCH
CONNECTOR PIN B
)Prh
^CIRCUIT^
X
NO
YES
REPLACE MCU. RETEST
REPLACE VACUUM SWITCH
ASSEMBLY AND RETEST.
REPAIR SHORT CIRCUIT IN
WIRE HARNESS. RETEST.
•NOTE: ALSO DETERMINE
IF CONTINUITY EXISTS
BETWEEN VACUUM
SWITCH CONNECTOR PIN B
AND MCU CONNECTOR 55.
YES
REPAIR HARNESS OPEN
CIRCUIT. RETEST.
TEST CONTINUITY BETWEEN
DIAGNOSTIC CONNECTOR
D2
PIN
10
AND MCU
CONNECTOR PIN 20.
DISCONNECT TES WIRE
CONNECTOR AT AIR
CLEANER AND RETEST.
CONT'D.
CONT'D.
81131B(J)