It's right out of my '98 Dodge/Chrysler Factory Service Manual... It says you
should measure approximately .25v at idle and 4.8v at WOT from the signal wire
(back to the PCM). I think you are absolutely right that over 3.4v (maybe 3.5v)
is the magic number for WOT... I measured .6v at idle and 3.8v at WOT.
Do you have any notion as to why it doesn't return a higher voltage at WOT (it's
getting 5.1v to the sensor on mine) and if this has any performance
implications?
Tom
____________________Reply Separator____________________
Subject: Re: DML: TPS voltage @ WOT
Author: <dakota-truck@buffnet.net>
Date: 4/25/00 1:37 PM
Hey you guys - I've been quietly following this thread until I could add
something of value. What printed materials say they should read 4.5-4.8V at
WOT? The reason I ask is because my 1996 Chrysler Powertrain Diagnostics
text states that voltages above 0.5V and below 3.5V are valid ranges and thus
will not produce a trouble code. I would guess that around 3.4V is the magic
point that enables WOT operation. Both my trucks go to about 3.7 volts while
running and at WOT. They both start out at about 0.6V with foot off the
pedal (throttle closed).
Latr,
Shane
ps - For much better EFI troubleshooting stuff than can be found in ANY
Chiltons or even the FSM - get the "Powertrain Diagnostics" manual from the
same source as the FSM. Its about 900 pages of nothing but computer (PCM)
and sensor diag stuff. For example - it talks about the three Motorola
microcontrollers that are the brains and hearts of the PCM.
-- '96 IndyRam-HisIndy-MPI/TB/Pulleys/Coil/Wires/CompTAs '96 IndyRam-HerIndy-numbered(#142)"Track Truck" '74 Triple-Black Dodge Challenger Rallye 360 home-brew EFI R&D vehicle '68 Black Corvette Convertible 427 (For Sale)
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