Jeep J-10 Series 1982 Technical & Service Manual page 433

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DIAGNOSTIC TEST 2
OPEN LOOP SWITCH TEST
FUEL SYSTEMS U-l 19
NOTE: ENGINE SHOULD BE AT NORMAL OPERATING
TEMPERATURE.
NOTE: CONTINUITY TESTING WITH MCU
CONNTECTED TO THE SYSTEM SHOULD INDICATE 2
OHMS. WHEN THE MCU IS DISCONNECTED FROM
THE SYSTEM, ALL CONTINUITY SHOULD INDICATE
LESS THAN 1 OHM. WHEN APPLICABLE,
DIAGNOSTIC CONNECTOR TERMINALS CAN BE
USED AS TEST POINTS INSTEAD OF MCU HARNESS
CONNECTOR TERMINALS.
USING A STANDARD VOLT-OHMMETER, TEST FOR CONTINUITY FROM THE DIAGNOSTIC
CONNECTOR PIN 13 TO MCU CONNECTOR PIN 14.
DISCONNECT VACUUM
HOSE FROM SWITCH 2 OF
VACUUM SWITCH
ASSEMBLY.
YES
DISCONNECT VACUUM
SWITCH ASSEMBLY WIRE
CONNECTOR AND RETEST
CONTINUITY.
DISCONNECT MCU
HARNESS CONNECTOR
AND RETEST.
rOPEN\ YES
^CIRCUIT/
?
REPAIR HARNESS SHORT
CIRCUIT BETWEEN
VACUUM SWITCH
ASSEMBLY AND MCU.
RETEST.
NO
REPAIR MALFUNCTION
AND RETEST.
YES
TEST FOR CONTINUITY
BETWEEN PIN 2 AND MCU
CONNECTOR PIN 14.
NO
YES
DISCONNECT COOLANT
TEMPERATURE SWITCH
CONNECTOR AND RETEST.
YES
YES
REPLACE COOLANT
TEMPERATURE SWITCH
AND RETEST.
REPLACE VACUUM SWITCH
ASSEMBLY AND RETEST.
DISCONNECT MCU
CONNECTOR AND RETEST.
YES /OPEN^
^CIRCUIT.
REPLACE MCU AND
RETEST.
CONTD.
REPAIR HARNESS SHORT
CIRCUIT BETWEEN
COOLANT TEMPERATURE
SWITCH AND MCU.
RETEST.
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