Tachometer Signal Test

Tachometer signal, checking
Work sequence





- Connect voltmeter between terminal 7 of control unit connector and ground

Note: This reading is made with connector attached to control unit. Gain access to terminals by pulling back connector boot

- Connect suitable tachometer to engine for measuring rpm
- Start engine and raise rpm to 2000
^ Specification: voltage increases as RPMs increase

If specification NOT OK
- Replace control unit

If voltage reading OK, but vehicle tachometer does not correspond with testing tachometer, check wire between terminal 7 of control unit connector and vehicle tachometer according to current flow diagram. Repair as necessary.