Skylark V6-173 2.8L VIN W FI (1985)
Fig. 011 - Chart C-1A Park/Neutral Switch diagnosis
1.
Checks for a closed switch to ground in park position. If using an ohmmeter instead of a test light the resistance will be low, indicating continuity
to ground.
2.
Checks for an open switch in drive range. If using an ohmmeter instead of a test light to 12 volts, the resistance will be high or infinity, indicating
an open switch.
3.
Checks to this point indicate the P/N switch and wiring are OK, however, the ECM signal voltage on ckt. 434 may be missing. To check,
reconnect ECM. Either back probe ECM connector circuit 434 with selector in drive or disconnect P/N switch and probe harness connector ckt
434 with a voltmeter to ground.
