1) remove and clean the sensor. It has a magnetic end that gets grungy.
It might solve the problem.
2) yes it will screw up the shift points
3) basic part. not sure if there are multiple numbers though. IF it is
the same as the 46RE sensor, Expect it to list for under $50.
TonyC
-----Original Message-----
From: david.clement@verizon.net <david.clement@verizon.net>
To: dakota-truck-moderator@bent.twistedbits.net
<dakota-truck-moderator@bent.twistedbits.net>
Date: Saturday, July 10, 2004 8:37 AM
Subject: DML: Code P0720
>
>Yesterday on the way to lunch the check engine light came on. I plugged in
my
>scan tool and got P0720. Cleared it a couple of times but it comes right
back.
>
>Truck runs fine but the shift points at light throttle have moved up a few
>hundred rpm's (which actually seems to be better for performance). FWIW, 99
>3.9l v6, 42RE tranny.
>
>Anyway, the FSM states that P0720 is a descrpency in the output of the
>transmission speed sensor and the vehicle speed sensor or that the
transmission
>speed sensor output is less than 60 rpm when the vehicle speed is more than
15
>mph.
>
>I have cleaned the connections on the output speed sensor but the code
still
>comes back.
>
>Questions:
>
>1. Before running out and picking up another sensor is there anything else
I
>should check?
>
>2. If this sensor is not working or is giving erronous readings will that
>account for the increase in light throttle shift rpm's?
>
>3. Is this sensor the same for all Chrysler products that use the 42RE
series
>tranny (my son works for Jeep now and I would like to take advantage of his
>discount if I can get it through him)?
>
>Thanks as always,
>
>Dave Clement
>99 SLT+ CC 4x4 3.9l v6
>
This archive was generated by hypermail 2b29 : Sun Aug 01 2004 - 00:46:14 EDT