Code P1780

DANO1971

MEMBER
1996 TOYOTA 4RUNNER
3.4L
V6
4WD
AUTOMATIC
325,000 MILES

I switched out the neutral safety switch. Cleaned out the plug that plugs into very well I use toothpicks are used paper towels and I use electrical cleaner. Check engine light went off it was fine all weekend I drove about five miles this morning on my way back to check engine light went back on. Does anybody have any more options that I could be?

5 Replies

KEN L

MASTER CERTIFIED MECHANIC
47,643 POSTS

Hello,

It sounds like you have a bad connection in the wiring between the switch and the ECU. Here is a guide and some wiring diagrams (below) so you can run some tests to get the problem fixed.

https://www.2carpros.com/articles/how-to-check-wiring

Please run some tests and get back to us we are interested to see what it is.

Cheers, Ken

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Tuesday, July 11th, 2017 AT 11:32 AM

DANO1971

MEMBER
32 POSTS

I have a quick question for you I have a multimeter that I got to check the wiring on the neutral safety switch. It has two wires one red one black I was just wondering if you know like if I put the red wire in the harness that plugs into the neutral safety switch where do I put the black wire do I just grabbed it to a piece of metal or I don't know what to do

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Sunday, August 27th, 2017 AT 5:57 PM

KEN L

MASTER CERTIFIED MECHANIC
47,643 POSTS

Can you take a pic of what you are talking about so I can see?

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Wednesday, August 30th, 2017 AT 9:34 AM

DANO1971

MEMBER
32 POSTS

I'm just going to go buy a test light today I just saw them selling for $6, so I'm just going to buy one of them instead of trying to figure out the multimeter

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Thursday, August 31st, 2017 AT 4:29 AM

KEN L