Tachometer Circuit Test: Q45

Using a voltmeter, backprobe between terminal No. 29 (White/Green wire) at instrument cluster White 14-pin harness connector N13 and terminal No. 31 (Black wire) at instrument cluster White 16-pin harness connector N14. See Figure . Start engine. Observe voltmeter while changing engine RPM. If voltage is higher at higher RPM and lower at lower RPM, tachometer circuit is okay at this time. If voltage is not higher at higher RPM and lower at lower RPM, repair open and/or short to ground in White/Green wire or open in Black wire. See WIRING DIAGRAMS  .