Test NF-8A - Checking Park/Neutral Safety Switch
NOTE:
For connector terminal identification, see CONNECTOR IDENTIFICATION
. For appropriate wiring diagram, see WIRING DIAGRAMS at end of article.
- Using DRB-II, read park/neutral input state. While moving gear selector in and out of PARK and REVERSE positions, observe DRB-II display. If DRB-II displays P/N or D/R, test is complete.
- If DRB-II does not display P/N or D/R, turn ignition switch to OFF position. Put gear selector in PARK position. Disconnect Single Board Engine Controller (SBEC) 60-pin connector.
- Disconnect power disconnect cable at battery. Put DRB-II in ohmmeter mode. Probe SBEC connector terminal No. 30 (Brown/Yellow wire). While moving gear selector in and out of PARK and REVERSE positions, observe DRB-II display.
- If DRB-II display switches from less than 5 ohms to more than 5 ohms, replace Single Board Engine Controller (SBEC). If display does not switch from less than 5 ohms to more than 5 ohms, check if display always stays at less than 5 ohms.
- If display always stays at less than 5 ohms, repair Brown/Yellow wire for a short to ground. Perform VERIFICATION PROCEDURE VER-2. If display does not always stay at less than 5 ohms, disconnect park/neutral safety switch connector. See Fig 1 . Using an external ohmmeter, test resistance of park/neutral safety switch Brown/Yellow wire.
- If resistance is less than 10 ohms, replace park/neutral safety switch; if resistance is more than 10 ohms, repair open in Brown/Yellow wire. Perform VERIFICATION PROCEDURE VER-2.