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View Full Version : Torq. Lockup


bear
10-12-2002, 12:02 PM
I'm having a problem w/my torq. conv. lockup. can't figure<br>out what the problem is. I've tried apps recal., put new speed<br>senser, new brake switch, upper vavle body seperator plate,<br>and had apps. tested for flat spots or skip voltage. problem not fixed. any sug.<br><br><br>99' 2500 24 valve 47re.

mac1
10-13-2002, 12:43 AM
I have the same problem right now with a customers truck(99). I had Dodge reflash the PCM with 18-02-99 and it seemed to fix the problem for a very short time (1 day) and now it's back. I was reading on the TDR that the same problem was cured by replacing his crankshaft position sensor.On the 2001 and up this is part of the VP 44. I am going to replace the crankshaft sensor on this truck soon to see if that fixes the problem. If you have a scan tool you can see if the sensor is putting out the correct signal.

bear
10-13-2002, 04:10 PM
I dont have A scan tool, but I know someone who does. the <br>problem is some of them do'nt scan the diesel from what I understand.

AlpineRAM
10-15-2002, 08:04 AM
Had the same problem. Tested for hydraulic failure by adding a lockup switch- locked up and held perfectly. so problem was limited to be electrical. Installes a 1 mikrofarad capacitor between the TPS wire and ground on the ECM. This filters the signal. Noise on this signal is interpreted as movement on the go pedal, so the tranny won't lock up. Total costs about 10 US$ (variety of capacitors, lockup switch, cables) and 30 mins including test driving. <br><br>HTH<br><br>AlpineRAM

bear
10-15-2002, 07:55 PM
thanks for the imput Alpineram, I think your right about it being electical. I found out about a TSB from ATT diesel on<br>bypassing the ECM all together.

admin
10-16-2002, 09:30 AM
AlpineRam, I never thought about a lockup switch being a tester like that, but you have a cool thought there. Never thought about it that way. Pretty neat :)

AlpineRAM
10-16-2002, 04:13 PM
Thanks Jack! But... the credits belong to Bill K. He knew that it'S rather difficult for me to get to code scanners, OBD stuff etc. So he worked out something really primitive to decide whether the problem is electrical or hydraulic. Since I learned a bit about the Dodge here and from Bill K, and some other things from the repair manual I think i should share what I know through this site. I must say that this site is great. Thank you Jack for giving us this opportunity, and thanks to all who share valuable informations!<br><br>AlpineRAM

drecu
10-16-2002, 05:19 PM
<br>I dont have A scan tool, but I know someone who does. the <br>problem is some of them do'nt scan the diesel from what I understand. <br><br><br>Hey Bear!!<br><br>I have had the ECM Bypassed on my truck. it worked for about 3,000 miles &amp; then it started again, You need to get TSB 18-02-99 done for 65 bucks it will fix cruise, if goes faster than you set it &amp; it also fixes the shift points, plus it fixes the TC Lockup problem you are having! <br>Any Questions about the ECM Bypassing or the TSB you can PM Me!<br><br>DRecu!

mac1
10-16-2002, 11:35 PM
Hey if possible could you please post or send me the info about the ECM bypassing. The problem seems to be sloved for now, the line pressure was too high causing the trans to down shift.<br><br><br>promac@shaw.ca<br><br><br>Thanks