Engine Speed Sensor: Testing and Inspection
Speed sensor, checkingWork sequence
- Unplug gray connector 2 from plenum panel mounting
- Connect ohmmeter between terminals 1 and 2 of unplugged connector
^ specification: 1 K ohm
If specification NOT OK
- Replace engine rpm sensor
If specification OK
- Connect ohmmeter between terminals 1 and 3 then 2 and 3 of unplugged connector
^ specification: infinite ohm
If specification NOT OK
- Replace engine rpm sensor
If specifications OK
- Check wiring and connectors between sensor and control unit as follows
- Remove control unit cover panel located on passenger side footwell
- Unplug control unit connector
- Using ohmmeter, check between terminals of speed sensor connector C and control unit connector A
^ Connector C terminal (1) and control unit connector A terminal (29)
^ Connector C terminal (2) and control unit connector A terminal (11)
^ Connector C terminal (3) and control unit connector A terminal (28)
^ each specification: approx. 0 ohm
If specifications NOT OK
- check for open circuit in wiring between engine rpm sensor and control unit
If wiring OK replace control unit