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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.
