5000CS Turbo L5-2226cc 2.22L SOHC Turbo (MC) (1987)
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Using jumper cable, connect terminal 2 of open shut-off valve connector to ground
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Specification: 40% duty cycle
Note: Duty cycle must read 40% regardless of engine rpm
If duty cycle reading NOT OK
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Remove cover of control unit located in front passenger footwell
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Unplug control unit connector
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Using ohmmeter, check for continuity between terminal 2 of shut-off valve connector and terminal 4 of control unit connector A
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Specification: 0.2 ohm
If ohmmeter reading NOT OK
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Check for open circuit in wiring according to current flow diagram
If wiring OK
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Replace control unit