Circuit Description

The PNP goes on when the shift lever is in the N or P shift position. When it goes on, terminal NSW of the engine control module (ECM) is grounded to body ground via the starter relay, thus the terminal NSW voltage becomes 0 V. When the shift lever is in the D, 2, L or R position, the PNP switch goes off, so the voltage of the ECM. Terminal NSW becomes battery voltage, the voltage of the ECM internal power source. If the shift lever is moved from the N position to the D position, this signal is used for air-fuel ratio correction and for idle speed control (estimated control), etc. Possible causes are:

• DTC P0705
  
  Two or more switches are ON simultaneously for R, N, 2 and L positions (2 trip detection logic).
• DTC P0850
  
  When the vehicle speed is 25 mph (40 km/h) or more and the engine speed is between 1500-4000 RPM for 30 seconds or more with the park/neutral position switch ON (N position), 2 trip detection logic.
• Short in PNP switch circuit.
• Defective PNP switch.
• Defective ECM.