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Co244 Pulse Width Modulation Delivered Torque Malfunction

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Fix trouble code P0894 on 2004 h2 hummer


The powertrain control module (PCM) monitors the difference between engine speed and transmission output speed. In D3 drive range with the TCC engaged, the engine speed should closely match the transmission output speed. In D4 drive range, with the TCC engaged, the TCC slip speed should be -20 to +50 RPM.
When the PCM detects excessive TCC slip when the TCC should be engaged, then DTC P0894 sets. DTC P0894 is a type B DTC.

TCC - torque converter clutch
Diagnostic Aids
• Bronze material found in the transmission oil pan may indicate stator shaft bushing wear. If bushing wear is suspected, inspect the stator shaft and the input, turbine, shaft for damage.
• Refer to Symptoms - Automatic Transmission for more information.
Do you have a scan tool ?

Install a scan tool.
Turn ON the ignition, with the engine OFF.
Important: Before clearing the DTC, use the scan tool in order to record the Freeze Frame and Failure Records. Using the Clear Info function erases the Freeze Frame and Failure Records from the PCM.
Record the DTC Freeze Frame and Failure Records.
Clear the DTC.
Important: It may be necessary to allow multiple TCC cycles to occur in order to verify a slipping condition. It may also be necessary to ensure the transmission is warm before performing this step.
Drive the vehicle in 4th gear with the TCC commanded ON.
Does the scan tool TCC Slip Speed measure within the specified range for 7 seconds?
130-800 RPM

Inspect the torque converter clutch (TCC) solenoid valve for the following conditions:
• Internal malfunction, such as sediment or damage
• Damaged seals
• Refer to Torque Converter Clutch Pulse Width Modulation Solenoid, Torque Converter Clutch Solenoid, and Wiring Harness .
Inspect the torque converter clutch pulse width modulation (TCC PWM) solenoid valve for the following conditions:
• Internal malfunction, such as sediment or damage
• Damaged seals
• Refer to Torque Converter Clutch Pulse Width Modulation Solenoid, Torque Converter Clutch Solenoid, and Wiring Harness .
Did you find and correct the condition?

Oct 10, 2017 | Hummer Cars & Trucks

1 Answer

Lost my dash light on my 1999 grand marquis


Probably a problem with the LCM - lighting control module . The main light switch is a input to the (LCM) . Here is free wiring diagrams http://www.bbbind.com/free_tsb.html Enter your vehicle info. Year , make , model an engine size . Under system click on lighting , under subsystem click on insturment panel lamps . Click the search button then the blue link . Do you know how to test PWM ,this is how the LCM controls the lights .
Pulse-width modulation Pulse-width modulation (PWM), or pulse-duration modulation (PDM), is a modulation technique used to encode a message into a pulsing signal. Although this modulation technique can be used to encode information for transmission, its main use is to allow the control of the power supplied to electrical devices, especially to inertial loads such as motors an lighting .


Pulse width modulation

Jun 15, 2017 | Cars & Trucks

1 Answer

How to locate the torque converter clutch solenoid on a 03 Pontiac Aztec.


Inside the transmission .

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(334) Torque Converter Clutch (TCC) Pulse Width Modulation (PWM) Solenoid Valve (ME7 or MN5

Nov 24, 2016 | 2003 Pontiac Aztek

1 Answer

I have a 2001 aurora and code p1860 p1860 came up what is this and how much to fix


P1860 All GM - TCC (transmission Torque Converter Clutch) PWM Solenoid Circuit Electrical.
P1860 Description The Torque Converter Clutch Pulse Width Modulation (TCC PWM) solenoid valve controls the fluid acting on the converter clutch valve. The converter clutch valve controls the TCC application and release. The solenoid attaches to the control valve body within the transmission. The solenoid receives ignition voltage through circuit 239. The Powertrain Control Module (PCM) controls the solenoid by providing a ground path on circuit 418. Current flows through the solenoid coil according to the duty cycle (percentage of ON and OFF time). The TCC PWM solenoid valve provides a smooth engagement of the torque converter clutch by operating during a duty cycle percent of ON time.
When is the code detected? When the PCM detects a continuous open, short to ground or short to power in the TCC PWM solenoid valve circuit, then DTC P1860 sets. DTC P1860 is a type B DTC.

Possible causes - Faulty Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid
- Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid harness is open or shorted
- Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid circuit poor electrical connection. Unless you have a factory manual and very good auto repair skills this is best left to an expert. It is a messy dirty job that requires removing the parts inside the transmission for testing..

Aug 23, 2016 | Cars & Trucks

1 Answer

P1860 CODE CHEVY S10 TRUCK 1998


Possible causes
- Faulty Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid
- Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid harness is open or shorted
- Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid circuit poor electrical connection

Aug 28, 2014 | Cars & Trucks

2 Answers

What are these Advance Auto codes? HELP PLEASE!


check out this website you mite find what you need

http://m.greatautohelp.com/dtc/dtcindex.html

Oct 03, 2017 | 2006 Chevrolet TrailBlazer LS

1 Answer

AWD not working


No 4X4 switch on the instrument panel ?
Automatic Transfer Case
The single speed automatic transfer case system shifts automatically from rear wheel drive to four wheel drive when the transfer case shift control module (TCSCM) senses the difference in rotation speed of the front propeller shaft and the rear propeller shaft . Two vehicle speed sensors, one located at the rear output shaft area of the transfer case, and the other, located at the front output shaft area of the transfer case, send front and rear propeller shaft rotation speed information to the TCSCM.
When the front and rear output shaft rotations remain the same, the TCSCM sends pulse width modulation signals to the encoder/motor to keep the transfer case in rear wheel drive. When the front and rear output shafts rotations are different, the shift control module sends pulse width modulation signals to the encoder/motor to engage the transfer case into four wheel drive.
The system will automatically transfer a percentage of torque to either the front or rear axles as required to stop all wheel slip. When the front and rear output shafts rotations return to the same speed rotation, the shift control module sends pulse width modulation signals to the encoder/motor to position the transfer case back into rear wheel drive.
When the transfer case is engaged into four wheel drive, a lamp indicator on the instrument cluster will light. The automatic transfer case system is completely automated, no transfer case control button switching system is required.

Do you know what DTC'S - diagnostic trouble code's are ?
Auto part stores can't read these , your best bet take it to a qualified repair shop . One that has the knowledge an diagnostic equipment .
DTC C0300 Rear Speed Sensor Malfunction
DTC C0305 Front Speed Sensor Malfunction
DTC C0308 Motor A/B Circuit Low
DTC C0309 Motor A/B Circuit High
DTC C0310 Motor A/B Circuit Open
DTC C0315 Motor Ground Circuit Open
DTC C0374 General System Malfunction
DTC C0376 Front/Rear Shaft Speed Mismatch
DTC C0550 ECU Malfunction
DTC C0611 VIN Information Error
DTC C0895 Device Voltage Malfunction
Without proper factory service an repair info. an diagnostic tools

Jan 08, 2018 | 1998 Oldsmobile Bravada

1 Answer

I have 2006 Buick Rainier it has been running ok then the the other day when you turn left or right it like your driving a 4 wheel pickup with the 4 wheel drive locked in it jerks. Plugged in a hand held...


You wasted your time at Advanced Auto --because they
won't explain what needs to be done & you wouldn't understand
anyway

Go to a repair shop--they have to use the proper professional
scan tools & testing procedures, along with reference material

It has to be component tested

This procedure has been with us for 32 years now,
any time you get any dash lights or codes

Dec 17, 2012 | 2006 Buick Rainier

1 Answer

2006 Buick Rainier


You don't have the ability to do but one thing

That is have a repair shop daignose & component
test according to codes using specail tools & skills

You have steering sensor,abs braking & traction or
mechanical issues,three problems maybe & only
2 that maybe be tied together

Dec 15, 2012 | 2006 Buick Rainier

1 Answer

I have 2003 linclon ls had a rebuilt tranny and cat put in and its run sluggish I press the gas and it doesnt go fast but the Rpm raise up and changes gear wrong but I have a p0190 code popping up alot and...


P0190 - Fuel Rail Pressure Sensor Circuit Malfunction (FRP) The comprehensive component monitor (CCM) monitors the FRP sensor to the PCM for VREF voltage. The test fails when the VREF voltage from the PCM drops to a voltage less than a minimum calibrated value.
  • VREF open in harness.
  • VREF open in sensor.
  • VREF open in PCM.
Verify VREF voltage between 4.0 and 6.0V.
Your vehicle has electronic returnless fuel system . A control module controls the fuel pump speed from inputs from the PCM - engine computer from the fuel rail puressure sensor . The modules on your vehicle are on a serial data bus (network) an they send messages from one to the other . The REM - rear electronic module is in charge of controlling the fuel pump through PWM - pulse width modulation .
Pulse-width modulation Pulse-width modulation (PWM), or pulse-duration modulation (PDM), is a modulation technique used to encode a message into a pulsing signal. Although this modulation technique can be used to encode information for transmission, its main use is to allow the control of the power supplied to electrical devices, especially to inertial loads such as motors

Your problem maybe the fuel rail pressure sensor is bad , but could be something else .Hooking up a factory or professional scan tool to check data parameters is the proper way to diagnose .

Nov 23, 2017 | 2002 Lincoln LS

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