Circuit Description
Park/neutral position switch detects shift lever position and sends signals to ECM. ECM receives signals (P, R, N, D, 4, 3, 2 and L) from the park/neutral position switch. When the shift lever is in the "4" position (with transmission control switch for "D" and "4" pressed), "4" in the shift position indicator light will come on, and when the shift lever is in the "D" position (with transmission control switch for "D" and "4" released), "D" in shift position indicator light will come on. When shift lever is in "L" position (with transmission control switch for "2" and "L" pressed), "L" in shift position indicator light will come on and when shift lever is in "2" position (with transmission control switch for "2" and "L" released), "2" in shift position indicator light will come on. See Fig 1. Possible causes are:
- Short in Park/Neutral Position (PNP) switch circuit.
- Faulty PNP switch.
- Faulty ECM.