5000CS Turbo L5-2226cc 2.22L SOHC Turbo (MC) (1987)
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Using ohmmeter, check between terminals of speed sensor connector C and control unit connector A
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Connector C terminal (1) and control unit connector A terminal (29)
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Connector C terminal (2) and control unit connector A terminal (11)
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Connector C terminal (3) and control unit connector A terminal (28)
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each specification: approx. 0 ohm
If specifications NOT OK
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check for open circuit in wiring between engine rpm sensor and control unit
If wiring OK replace control unit