CONTINUED FROM PREVIOUS PAGE COMPUTER Disconnect connector from computer and inspect connector on wire harness side as follows. INSPECT VACUUM SWITCH CIRCUIT Is there continuity between terminal 9 and body ground? No Open circuit in wire harness between terminal 9 of computer and terminal 1 of vacuum switch. Yes Start engine (idling). Is there continuity between terminal 9 and body ground? Yes Short circuit in wire harness between terminal 9 of computer and terminal 1 of vacuum switch. No Stop the engine. INSPECT VACUUM PUMP CIRCUIT Is there continuity between terminal 1 and body ground? No Open circuit in wire harness between terminal 1 of computer and terminal 1 of vacuum pump. Yes Is there continuity between terminal 1 and body ground when disconnect connector from vacuum pump? Yes Short circuit in wire harness between terminal 1 of computer and terminal 1 of vacuum pump. No Replace computer.