Torque Converter not locking up.
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Diesel Fan
Joined: Aug 2010
Posts: 10
Likes: 0
From: Pratt, Ks
Torque Converter not locking up.
Ive got a serious problem. i can't get my torque converter to lock up!!! 
it just started this morning. it worked fine last night and it doesn't work today. i have no idea what to do. i thought maybe it was my APPS so i reset that. but with no luck. my cruise control is also not working. and ive been told it was because of my APPS. Im at a dead end now. im thorwing two codes P1596 Speed Control Switch always high and 1693 which i know is 
a companion code. can someone tell me what to make of all of this? it would be extreamly helpful. thanks.
it just started this morning. it worked fine last night and it doesn't work today. i have no idea what to do. i thought maybe it was my APPS so i reset that. but with no luck. my cruise control is also not working. and ive been told it was because of my APPS. Im at a dead end now. im thorwing two codes P1596 Speed Control Switch always high and 1693 which i know is a companion code. can someone tell me what to make of all of this? it would be extreamly helpful. thanks.
how do u adjust the APPS?
my trans keeps shiftin in and out of od 2
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come on fellas help me out!
my trans keeps shiftin in and out of od 2
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come on fellas help me out!
Last edited by 24vmatt; Oct 18, 2010 at 05:58 PM. Reason: Automerged Doublepost
Diesel Enthusiast
Joined: Jul 2010
Posts: 313
Likes: 26
From: South Carolina
check and see if your overdrive and lock-up solenoid is bad, the output speed sensor can also cause this problem
OK lets try this before we replace solenoids.
24 Valve APPS
Rewire Ground Instructions
1994+
Lock-Up-O/D shuttle/hunt
Symptoms: At steady throttle usually at approx 40-50 MPH the tachometer will rise and fall approx 150-200 RPMS as the Torque Converter Clutch engages and dis-engages.
Problem: Electrical noise in the conducting wires running from the PCM (power train control module) to the TPS ( throttle position sensor).
This may be verified by observing a scanner while the complaint is occurring. The PCM will command loc-up on &off, the transmission is only doing what it is being told. This is not a "transmission " problem. Working on the transmission will not fix the problem. The PCM reacts to monitored voltage spikes caused by the TPS power and signal wires picking up electrical noise from other wires in the harness. The primary culprit is the AC voltage produced by the alternator. Replacing TPS’s,sensors, or PCM reflash almost never fixes the problem.
Solution: Make sure both batteries are in good condition. Make sure all battery cable connections are clean and tight. Make sure all ground connections are not corroded, this applies to PCM, TPS, and all ground connections on chassis and engine. After rewire it is sometimes required to "re-learn " the TPS (APPS on 98.5 +). Here’s how: disconnect both batteries for 15 minutes, reconnect batteries, turn ignition switch to run position (do not crank engine), slowly depress the accelerator pedal to the floor and release, turn key off. Now you may start engine and road test to verify complaint is fixed. There is a very rare occurrence of the PCM itself being defective, this is the exception not the rule. Try the most economical fix first!
If this doesn't work you will need a noise filter.
24 Valve APPS
Rewire Ground Instructions
1994+
Lock-Up-O/D shuttle/hunt
Symptoms: At steady throttle usually at approx 40-50 MPH the tachometer will rise and fall approx 150-200 RPMS as the Torque Converter Clutch engages and dis-engages.
Problem: Electrical noise in the conducting wires running from the PCM (power train control module) to the TPS ( throttle position sensor).
This may be verified by observing a scanner while the complaint is occurring. The PCM will command loc-up on &off, the transmission is only doing what it is being told. This is not a "transmission " problem. Working on the transmission will not fix the problem. The PCM reacts to monitored voltage spikes caused by the TPS power and signal wires picking up electrical noise from other wires in the harness. The primary culprit is the AC voltage produced by the alternator. Replacing TPS’s,sensors, or PCM reflash almost never fixes the problem.
Solution: Make sure both batteries are in good condition. Make sure all battery cable connections are clean and tight. Make sure all ground connections are not corroded, this applies to PCM, TPS, and all ground connections on chassis and engine. After rewire it is sometimes required to "re-learn " the TPS (APPS on 98.5 +). Here’s how: disconnect both batteries for 15 minutes, reconnect batteries, turn ignition switch to run position (do not crank engine), slowly depress the accelerator pedal to the floor and release, turn key off. Now you may start engine and road test to verify complaint is fixed. There is a very rare occurrence of the PCM itself being defective, this is the exception not the rule. Try the most economical fix first!
If this doesn't work you will need a noise filter.
