I have a 2000 Toyota Solara V6, I was hoping someone could help me with the CEL I get every now and then. I own a scanner so I usually just clear it but is it reason for concern. The code pulled is P1780, a PNP switch malfunction... the car also starts kinda harshly... any feedback would be great. Thanks.

 

Make sure your Park/Neutral switch is tight

 

Engine Control System


CIRCUIT DESCRIPTION
The park/neutral position switch go on when the shift lever is in the N or P shift position. When it goes on, terminal NSW of the ECM is grounded to body ground via the starter relay, thus the terminal NSW voltage becomes 0 volt. When the shift lever is in the D, 2, L or R position, the park/neutral position switch goes off, so the voltage of 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.




DETECTING CONDITIONS

HINT: After confirming DTC P1780, use the TOYOTA hand-held tester to confirm the PNP switch signal from the CURRENT DATA.

 

I just got this code on my GS300 now... and I don't know if its a coincidence or not but both times I've gotten it on both vehicles it has been after using remote start... it usually goes away on its own also.. should i be worried? The toyota is still under warranty but everytime I schedule an appointment the light goes off before the appt. date.

 

Sorry to dig this up


I am planning on purchasing a 2001 ES300 and it has the p1780 and I noticed on test drive it has a remote starter..so I'm wondering since you mentioned it if somehow the remote starter is associated? How did your appointment go?