P0742 DTC Code? - 3800Pro.com Forum
3800Pro.com Forum  

Top 25 Lists
Top 25 FWD 3800 1/4 Mile Times
Top 25 FWD 3800 60' Launch Times
Top 25 RWD 3800 1/4 Mile Times
Top 25 RWD 3800 60' Launch Times

3800Pro Sponsors
AeroForce Technolgoies
B&R Racing
BadBeatsPoker.net Message Forum
Dyno Tune Motorsports
HP Tuners
INTENSE-Racing.com
Milzy Motorsports
Morad Parts Company
WBS Performance

Click our 3800Pro Sponsor Page for information on becoming a sponsor or check out our 3800Pro Sponsors Area for special deals.

Recommended Links
Bonneville Club
CobaltSS.Net Forum
Connecticut Grand Prix Club
Firebird V6/Camaro V6
Greater Ohio GP Club
Indianapolis GP Club
INTENSE-Racing
L67 Swap
Mass ClubGP
Midwest3800.com
Michigan GP Club
MyMonte.com
New Impala Forum
New England Pontiac Enthusiast's Org.
North American Impala Owners Association
Pennock's Fiero Forum
Regal Club
Street Commodores

Technical Links
Cam Specs
CASE Learn
OBD II Codes
Fastener Torque Specs
MAF Tables
Tuning Basics


Go Back   3800Pro.com Forum > Transaxle > FWD Transaxle Components

FWD Transaxle Components Discussions regarding input/output shafts, torque converters, gears, LSD's, etc..

3800Pro.com is the premier 3800Pro.com forum on the internet. Registered Users do not see the above ads.Please Register - It's Free!
Reply
 
LinkBack Thread Tools Search this Thread Display Modes
  #1 (permalink)  
Old 09-15-2006, 12:26 AM
3800 Newbie
Points: 3,227, Level: 35 Points: 3,227, Level: 35 Points: 3,227, Level: 35
Activity: 0% Activity: 0% Activity: 0%
 
Information not available to guests.
Join Date: Dec 2004
Posts: 17
Forum Experience
Points: 3,227, Level: 35 Points: 3,227, Level: 35 Points: 3,227, Level: 35
Activity: 0% Activity: 0% Activity: 0%
rockford4u is on a distinguished road
Send a message via AIM to rockford4u Send a message via MSN to rockford4u
rockford4u holds the following arcade championships:
None.
P0742 DTC Code?

I got a P0742 TCCSCSO
Torque Converter Clutch Solenoid Circuit Stuck On From PCM

I found out i have a GM remanufactured Tranny, is it possible the T/C Solenoid(s) wer not replaced or does this have to do with a over voltage porblem? thanks any input needed
__________________
Diamond Racing Pistons (Cer. Tops, moly skirts) .020" oversive. L32 Rods, VS Cam, CC Mod. Tit Valve Spring Retainers, Viton VS, CC 105# springs, RM Double Roller Timing Chain Set, Balance shaft removed, lifter valley holes drilled, oil for BS welded, Clevite 77 Tris for all, ARP Main studs, head studs, connecting rod bolts, flexplate bolts, Intense gen 3 MLS headgaskets .054" thickness. And a lot more that can't fit on here
Reply With Quote
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 09-15-2006, 10:19 AM
Certified 3800 Nut
Points: 12,843, Level: 73 Points: 12,843, Level: 73 Points: 12,843, Level: 73
Activity: 3% Activity: 3% Activity: 3%
 
Information not available to guests.
Join Date: Sep 2004
Posts: 2,193
Forum Experience
Points: 12,843, Level: 73 Points: 12,843, Level: 73 Points: 12,843, Level: 73
Activity: 3% Activity: 3% Activity: 3%
Tim King is on a distinguished road
Tim King holds the following arcade championships:
None.
The TCC release switch is part of the automatic transmission fluid pressure (TFP) manual valve position switch. The TFP manual valve position switch is mounted to the transmission valve body.

The TCC release switch is a normally-closed switch. When the TCC is released, TCC release fluid pressure opens the TCC release switch which opens the TCC release pressure circuit. When the voltage on the circuit is high (switch open), the PCM recognizes that the TCC is no longer engaged.

If the PCM detects that the TCC release switch is closed when the TCC is commanded OFF, then DTC P0742 sets. DTC P0742 is a type A DTC.
Conditions for Running the DTC

* No TP sensor DTC P0121, P0122 or P0123.
* No TCC PWM solenoid valve DTC P1860.
* No TCC release switch DTC P1887.
* The engine speed is greater than 500 RPM and not in fuel shut off.
* The engine torque is 95-270 Nm (70-200 lb ft).
* The TP angle is 5-45%.
* The transmission fluid temperature is 20-130C (68-266F).
* The time since the last gear range change is greater than 6 seconds.
* The speed ratio is less than 7.0.
* The TCC is commanded OFF.
* Slip speed is -20 to +25 for 8 seconds.

Conditions for Setting the DTC

The TCC release switch is closed 6 times for 4 seconds each, during one trip.
Action Taken When the DTC Sets

* The PCM illuminates the malfunction indicator lamp (MIL).
* The PCM commands the TCC ON at maximum capacity.
* The PCM freezes shift adapts.
* The PCM records the operating conditions when the Conditions for Setting the DTC are met. The PCM stores this information as Freeze Frame and Failure Records.
* The PCM stores DTC P0742 in PCM history.

Conditions for Clearing the MIL/DTC

* The PCM turns OFF the MIL during the third consecutive trip in which the diagnostic test runs and passes.
* A scan tool can clear the MIL/DTC.
* The PCM clears the DTC from the PCM history if the vehicle completes 40 consecutive warm-up cycles without an emission-related diagnostic fault occurring.
* The PCM cancels the DTC default actions when the fault no longer exists and the ignition switch is OFF long enough in order to power down the PCM.

Diagnostic Aids

* Inspect the connectors at the controller, the component and all other circuit connecting points for an intermittent condition. Refer to Testing for Intermittent and Poor Connections in Wiring Systems.
* Inspect the circuit wiring for an intermittent condition. Refer to Testing for Electrical Intermittents in Wiring Systems.
* Rapid fluctuation in line pressure could set DTC P0742.
* An open condition in the TCC release circuit or switch would set DTC P1887. Open circuits are not diagnosed in DTC P0742.
* Inspect for a pressure regulator condition.
* Inspect for abnormal line pressure.
* The customer may notice an engine stalling condition.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

3.

A Yes answer indicates that the TCC is functioning properly.
4.

By disconnecting the transmission connector, the PCM should interpret the open circuit as TCC release pressure present. A Yes answer indicates that the engine side of the circuit is functioning properly.
9.

This step tests for a mechanical or hydraulic condition.

DTC P0742 TCC System Stuck On

Step


Action


Value(s)


Yes


No

1


Did you perform the Powertrain Diagnostic System Check?


--


Go to Step 2


Go to Powertrain On Board Diagnostic (OBD) System Check in Engine Controls

2


Did you perform the transmission fluid checking procedure?


--


Go to Step 3


Go to Transmission Fluid Checking Procedure

3


1. Install a Scan Tool .
2. Turn ON the ignition with the engine OFF.

Important

Before clearing the DTCs, use the Scan Tool in order to record the Freeze Frame and Failure Records for reference. The Clear Info function will erase the data.

3. Record the DTC Freeze Frame and Failure Records, then clear the DTCs.
4. With a Scan Tool , observe the TCC release pressure status.
5. Start the engine.

Does the Scan Tool indicate Yes for TCC release pressure?


--


Go to Diagnostic Aids


Go to Step 4

4


1. Turn OFF the ignition.
2. Disconnect the transmission 20-way connector.
3. Turn ON the ignition with the engine OFF (additional DTCs may set).

Does the Scan Tool indicate Yes for TCC release pressure?


--


Go to Step 5


Go to Step 6

5


Test the signal circuit (CKT 1804) of the TCC release switch for a short to ground between the AT inline 20-way connector and the TFP manual valve position switch.

Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find the condition?


--


Go to Step 10


Go to Step 7

6


Test the signal circuit (CKT 657) of the TCC release switch for a short to ground between the PCM connector C2 and the AT inline 20-way connector.

Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?


--


Go to Step 12


Go to Step 11

7


1. Remove the TFP manual valve position switch.
2. Inspect the TCC release switch for the following conditions:
* A damaged or leaking seal
* Sediment or debris
* Damaged switch contacts
* Stuck switch contacts

Did you find a condition?


--


Go to Step 8


Go to Step 9

8


Replace the TFP manual valve position switch.

Refer to Transmission Fluid Pressure (TFP) Manual Valve Position Switch Replacement .

Did you complete the replacement?


--


Go to Step 12


--

9


1. Inspect for the following conditions:
Refer to Transmission Overhaul Procedure in the 4T65-E Section of the Transmission Unit Repair Manual.
* TCC control valve stuck
* TCC feed limit valve stuck
* TCC regulator apply valve stuck
* TCC PWM solenoid valve stuck
* Pressure regulator valve stuck
2. Repair or replace any malfunctioning components.

Did you find and correct a condition?


--


Go to Step 12


--

10


Replace the transmission wiring harness assembly.

Refer to Solenoids and Wiring Harness Replacement .

Did you complete the replacement?


--


Go to Step 12


--

11


Replace the PCM.

Refer to PCM Replacement/Programming in Engine Controls.

Did you complete the replacement?


--


Go to Step 12


--

12


In order to verify your repair, perform the following procedure:

1. Select DTC.
2. Select Clear Info.
3. Drive the vehicle in a DRIVE gear.
* The throttle position must be 5-45%
* The time since the last gear range change must be greater than 6 seconds
* The TCC must be commanded OFF
* Slip speed must be 150-200 RPM.
* The TCC release switch must be open, indicating TCC release pressure is present for 5 seconds.
4. Select specific DTC.
5. Enter DTC P0742.

Has the test run and passed?


--


System OK


Go to Step 1
__________________
98 TT Firebird
8.9@152

Reply With Quote
  #3 (permalink)  
Old 09-19-2006, 10:31 PM
FreemenGMTech's Avatar
3800 Senior Member
Points: 3,129, Level: 34 Points: 3,129, Level: 34 Points: 3,129, Level: 34
Activity: 0% Activity: 0% Activity: 0%
 
Information not available to guests.
Join Date: Oct 2005
Posts: 240
Forum Experience
Points: 3,129, Level: 34 Points: 3,129, Level: 34 Points: 3,129, Level: 34
Activity: 0% Activity: 0% Activity: 0%
FreemenGMTech is on a distinguished road
FreemenGMTech holds the following arcade championships:
None.
Quote:
Originally Posted by Tim King View Post
The TCC release switch is part of the automatic transmission fluid pressure (TFP) manual valve position switch. The TFP manual valve position switch is mounted to the transmission valve body.
System OK


Go to Step 1
i see someone has access to alldata or gm si2000
__________________
----LEGAL SPEAK ----> this is just a theory and is no way intended for a fix, repair, tsb, factory authorized modiciation, or proceedural update! this is just some idiot talking out his butt.

if it an't broke DONT replace it, or suffer issues later [your choice].
-Mr. Goodwrench
[signature broke - never said i is an english major nitpick all you wish]
Reply With Quote
Sponsored Links
Advertisement
 
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Getting a code p1350 and p0122 help IlubGM DTC's, Problems & Troubleshooting 7 07-10-2006 11:18 AM
95 3800 Engine Loves Code 300 Random Misfires 95OldsSilo DTC's, Problems & Troubleshooting 4 01-29-2006 09:05 PM
Mass Mod Day Discount Code Rogue Eastern Time Zone 2 01-27-2006 12:12 PM
Code P0442 Help PacesettersPerformance DTC's, Problems & Troubleshooting 1 01-01-2006 02:21 PM
DTC P1667 and P1662 code help bowtie929 DTC's, Problems & Troubleshooting 1 05-02-2005 12:24 AM


All times are GMT -4. The time now is 07:51 PM.


Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
SEO by vBSEO 3.2.0
vB.Sponsors
Content and Graphics Copyright 2005 - 2008, 3800Pro.com. All Rights Reserved.