Help with code P0473
Thread Starter
|
New User
Joined: Jul 2004
Posts: 3
Likes: 2
Help with code P0473
My SES light came on and the O/D off light started flashing so I went to Auto Zone and this is the code that came up (P0473-Torque Converter Circuit Electrical) Help please. I dont want to do any more damage by driving.I have a 2001 F-150 4.6 with a 4R70
Last edited by JammanX; Jul 23, 2004 at 11:02 PM.
Hotshot
Joined: Aug 2002
Posts: 12,679
Likes: 15
From: BC, Canada
Hi and welcome to the forum 
My manual doesn't show a P0473. Could it be a P0743?
A P0743 means TCC (Torque Convertor Clutch) solenoid circuit fails to provide voltage drop across solenoid. Circuit open or shorted or PCM driver failure during on-board diagnostic.
If it's shorted the TCC will probably always be engaged and the engine would stall at low speeds. If it's open the Torque Convertor wont lock up. You should be able to notice that when you drive it if you hold it at a steady speed, say 40 mph, and press the brake pedal, with your left foot, just hard enough for the brake lights to come on without slowing the truck, you should feel the TC unlock (engine will rev up a bit), when you let the brake off the TC should lock back up and the rpm will go down again.
If that doesn't work you probably have an open circuit in the wiring to the TCC, likely a broken or disconnected wire inside the transmission pan, or a bad TCC solenoid.
My manual doesn't show a P0473. Could it be a P0743?
A P0743 means TCC (Torque Convertor Clutch) solenoid circuit fails to provide voltage drop across solenoid. Circuit open or shorted or PCM driver failure during on-board diagnostic.
If it's shorted the TCC will probably always be engaged and the engine would stall at low speeds. If it's open the Torque Convertor wont lock up. You should be able to notice that when you drive it if you hold it at a steady speed, say 40 mph, and press the brake pedal, with your left foot, just hard enough for the brake lights to come on without slowing the truck, you should feel the TC unlock (engine will rev up a bit), when you let the brake off the TC should lock back up and the rpm will go down again.
If that doesn't work you probably have an open circuit in the wiring to the TCC, likely a broken or disconnected wire inside the transmission pan, or a bad TCC solenoid.
Freshman User
Joined: Jul 2004
Posts: 32
Likes: 0
Usually if your o/d light is flashing it is your mlp sensor on the tranny. Is you abs light on to? i have seen where the abs light is on and the o/d light flashes it is the differential pressure sensor / r.a.b.s. sensor in the top of the differential but i have seen where these sensors wont set a check engine light
let me know what you find out
let me know what you find out
Thread Starter
|
New User
Joined: Jul 2004
Posts: 3
Likes: 2
Thanks for the info Racerguy. What information you gave me coinciding with someone elses info on the 4R70w plugs inside the pan going bad I think I will be able to find the problem easy enough. I am going to drop my pan as soon as my truck cools. I'll let you know.
Thread
Thread Starter
Forum
Replies
Last Post
Crew_Cab_78
1973 - 1979 F-100 & Larger F-Series Trucks
17
Mar 30, 2020 07:34 PM
Richharr
Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W)
14
Apr 13, 2008 01:47 PM
