Rev Limiter in Drive?
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Junior Member
Joined: Sep 2010
Posts: 8
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From: California
Thank You Dan,
Considering that the problem is not apparent in first gear, I agree with your diagnosis. I am also suspicious that your original suggestion of the neutral safety switch might still be suspect. My examination of this produced some results I did not expect. Eg; in my day, these were simply "on or off". Now, I see that each gear selected can be an indication from the position of the neutral safety switch on some cars. If first is working correctly but 2,3 and 4 are being confused with neutral instead of grouped with first, this could possibly explain first gear working correctly and the others failing (as could the trans switch). I will not get a chance to look this over again until sometime on Monday. I want to take a moment to express my thanks for your input, and I hope that you will follow this thread until I (or more appropriately "we") have it beat. I will run some tests on Monday. Have a nice weekend. Best Regards....Pat
Considering that the problem is not apparent in first gear, I agree with your diagnosis. I am also suspicious that your original suggestion of the neutral safety switch might still be suspect. My examination of this produced some results I did not expect. Eg; in my day, these were simply "on or off". Now, I see that each gear selected can be an indication from the position of the neutral safety switch on some cars. If first is working correctly but 2,3 and 4 are being confused with neutral instead of grouped with first, this could possibly explain first gear working correctly and the others failing (as could the trans switch). I will not get a chance to look this over again until sometime on Monday. I want to take a moment to express my thanks for your input, and I hope that you will follow this thread until I (or more appropriately "we") have it beat. I will run some tests on Monday. Have a nice weekend. Best Regards....Pat
Retired Senior Admin
Expert Gearhead
Joined: May 2006
Posts: 29,661
Likes: 40
From: Sheboygan Wisconsin
We try to watch threads close and will make sure we get this figuered out. Chances are the gear switch is out of adjustment and indicating nutral when in fact it is in gear.
Senior Member
True Car Nut
Joined: Jul 2010
Posts: 2,469
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From: Danville, Illinois
Here are the pins to check for continuity or signal to the ecm.
Pin C2 vehicle speed sensor Purple
Pin C8 vehicle speed sensor Yellow
Pin C20 2nd gear signal tan/black
Pin D6 3rd gear signal dark green
Pin D22 4th gear signal light blue
Pin D11 park/neutral switch orange/black
Would the engine rev to 5k over 10mph in neutral? If it does not, check continuity on pin c2 and c8. If it does, check c20 d6 d22 and d11
Pin C2 vehicle speed sensor Purple
Pin C8 vehicle speed sensor Yellow
Pin C20 2nd gear signal tan/black
Pin D6 3rd gear signal dark green
Pin D22 4th gear signal light blue
Pin D11 park/neutral switch orange/black
Would the engine rev to 5k over 10mph in neutral? If it does not, check continuity on pin c2 and c8. If it does, check c20 d6 d22 and d11
Senior Member
Posts like a Northstar
Joined: Jul 2010
Posts: 615
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From: Camden, MI
with the TGPs, the PNP switch is very simple, whenever in neutral or park, a circuit is completed and the pin supplyin power to it should read VERY few volts(less than 1), but in any other position, it breaks the circuit and you should see +12V on that wire.
easy test: disconnect the connector and see if it will get above those revs in any gear. when it'* disconnected, the ECM thinks it'* in drive, and shouldn't limit RPMs until the normal limited kicks in, around 6K.
if that doesn't work out, follow this diagnostic tree.
http://imgur.com/UedMG.png
easy test: disconnect the connector and see if it will get above those revs in any gear. when it'* disconnected, the ECM thinks it'* in drive, and shouldn't limit RPMs until the normal limited kicks in, around 6K.
if that doesn't work out, follow this diagnostic tree.
http://imgur.com/UedMG.png
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