Jeep J-10 Series 1982 Technical & Service Manual page 419

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FUEL SYSTEMS 1J-105
5°-10° DWELL
TROUBLE CODE 21 AND 22 TOGETHER
• INSTALL TEST BULB
• GROUND'TEST" WIRE.
• CONNECT DWELL METER TO MC
SOLENOID (USE 6-CYL SCALE).
• WITH ENGINE IDLING, DISCONNECT WOT
VACUUM SWITCH CONNECTOR.
I OVER 10° DWELL j
CONNECT A TEST LIGHT BETWEEN ECM TERMINALS
U AND C. NOTE: TERMINAL U IS VOLTAGE SOURCE.
CHECK VACUUM AT WOT
SWITCH
LIGHT
| NO LIGHT
| OVER 10 IN. HG. |
UNDER 10 IN. HG
REMOVE BLACK ECM CONNECTOR
AND OBSERVE TEST LIGHT
LIGHTl
REPLACE ECM
NO LIGHT
REPLACE ECM
REPAIR SHORT TO GROUND BETWEEN
WOT SWITCH AND ECM
REPLACE VACUUM SWITCH ASSEMBLY]
| REPAIR HOSE OR HOSE FITTING
90769M