Park/Neutral Position (PNP) Switch (A/T Models)
- Switch is mounted to automatic transmission, near shift lever mechanism. Ensure switch is adjusted properly. Switch output can be affected by improper adjustment. Using DVOM, check continuity between selected terminals. Continuity should exist between ignition switch and ECM when shift selector lever is in Park or Neutral position. See PARK/NEUTRAL POSITION (PNP) SWITCH TERMINAL IDENTIFICATION table.
- Using DVOM, measure supply voltage from ignition switch in start position. Disconnect ECM harness connector. See ENGINE CONTROL MODULE (ECM) LOCATION table under COMPUTERIZED ENGINE CONTROLS. Disconnect park/neutral position switch connector. Turn ignition switch to START position. Measure voltage between switch (start circuit) and vehicle ground. See PARK/NEUTRAL POSITION (PNP) SWITCH TERMINAL IDENTIFICATION table. If battery voltage is present, go to next step. If voltage is less than battery voltage, inspect and repair circuit.
- Using DVOM, check continuity between PNP switch and ECM. See PARK/NEUTRAL POSITION (PNP) SWITCH TERMINAL IDENTIFICATION
table. If continuity does not exist in either circuit, inspect and repair faulty circuit as needed. If continuity exists and all preceding tests do not show any system or component malfunction and ECM is suspected, substitute ECM with known good component and retest.PARK/NEUTRAL POSITION (PNP) SWITCH TERMINAL IDENTIFICATION (1)
Application PNP & ECM Pin Nos. (Start) PNP & ECM Pin Nos. (Run) Stealth & 3000GT Federal 8 & 71 7 & 51 California 8 & 91 7 & 71 (1) For PNP harness connector terminal identification, see Fig 1 .