Circuit Description

WARNING: This page is about a different car, the 2003 Toyota Camry Solara. However, it is still accessible from the selected car via links, so may be relevant.

The park/neutral position switch comes on when the shift lever is in the N or P shift position. When it comes on, terminal NSW of the ECM is grounded to the 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 park/neutral position switch goes off, so the voltage of terminal NSW becomes battery positive voltage and 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), etc. Detecting conditions of DTCs are:

Two or more switches are ON simultaneously for N, 2, L and R positions (2 trip detection logic).
When driving under the following conditions for 30 seconds or more park/neutral position switch is ON (N position):
1. Vehicle speed is 44 mph (70 km/h) or more.
2. Engine speed is 1500-2500 RPM.

After confirming DTC P0705 and P0850 use the hand-held tester to confirm the PNP switch signal from the CURRENT DATA.