Question about 2000 Ford Expedition

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Torque converter or wiring problem affecting speed

When driving truck doesn't sift doen in gear...at 50 miles a hour the RPM is up to 3000...then it overspeeds so i hit the overdrive button and it will let me go up in speed but RPM goes up to 4000 +. Sometimes it just start working but lately it doesn't. i have auto start on my truck but i don't know its affecting it.Can it be a blown fuse or loose wiring. Someone told me it might be the torque converter might have a loose wire. What can i do?

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Tcc solenoid is crapping out take it to a mehcanic or pull the pan solenoid body assenbly and replace the tcc torque converter clutch pressure solenoid

Posted on Mar 11, 2009

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Posted on Jan 02, 2017

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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?

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What should the rpm be at in a 1998 iszue rodeo at 70 it is a 5 speed 4x4


It is impossible to calculate with out knowing the over drive ratio (5th gear) and the diff ratio and tire size but with most vehicle with 5 speed boxes it should be in the 3000 to 3500 rpms range
The average vehicle at 74 miles/hr or 120 k/h runs around 3200 rpms
it doesn't matter how many cylinders or if 4x4 or make of vehicle , the rpms is tied to the ratio of the gear and the diff and the circumference of the tires
Sorry , it cannot be more exact than that

Dec 31, 2015 | Cars & Trucks

1 Answer

'98 Pontiac Grand Prix SE PO742 torque converter clutch solenoid circuit stuck on Trac off light and service engine soon light stay on


When the PCM detects 3 occurrences of TCC slip between -20 and +50 RPM for 5 seconds, indicating the TCC is applied, when commanded OFF, then DTC P0742 sets. DTC P0742 is a type B DTC.
The PCM energizes the Torque Converter Clutch Solenoid Valve Assembly (TCC Sol. Valve Assy.) by creating a ground path on circuit 422. When grounded (energized), the valve stops converter signal oil from exhausting. This causes converter signal oil pressure to increase and move the TCC apply valve. The TCC Sol. Valve Assy. de-energizes when the PCM no longer provides a ground path. When de-energized, the valve will exhaust fluid and release the TCC
Diagnostic Aids
?€¢
Check for PRNDL DTC P0705. DTC P0705 affects transmission operation. This may set DTC P0742 falsely.


?€¢
Inspect the transmission fluid for debris.


DTC P0742 Torque Converter Clutch System Stuck ON Step
Action
Value(s)
Yes
No

1
Was the Powertrain On-Board Diagnostic (OBD) System Check performed?
--
Go to Step 2
Go to Powertrain On Board Diagnostic (OBD) System Check

2
Install the Scan Tool .
With the engine OFF, turn the ignition switch to the RUN position.
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. Record the DTC Freeze Frame and Failure Records, then clear the DTC.
Start and run the vehicle.
Select TCC Slip Speed on the scan tool.
With the transmission in D4, drive the vehicle through the 1-2 upshift.
In second gear is the TCC Slip Speed within the range specified?
-20 to +50 RPM
Go to Step 3
Go to Diagnostic Aids

3
Inspect for the following conditions:
The TCC apply valve stuck ON because of sediment or damage.
The TCC Sol. Valve Assy. stuck ON because of sediment or damage. Refer to Control Valve Body Assembly Inspection, in Unit Repair.
Was a condition found and corrected?
--
Go to Step 4
--

4
In order to verify your repair, perform the following procedure:
Using the scan tool, clear DTCs.
Operate the vehicle under the following conditions:
• The gear range is D2, D3 or D4.
• The commanded gear is not 1st.
• The engine speed is greater than 500 RPM for 5 seconds.
• Not in fuel shut off.
• The engine torque is 95-270 N·m (70-200 lb ft).
• The throttle position is 14-50%.
• The PCM commands the TCC OFF.
• The TCC slip speed is 150-2000 RPM for 5 seconds.
• The engine speed is 800-4000 RPM.
• The vehicle speed is 32-112 km/h (20-70 mph).
• The speed ratio is 0.65-1.18.
• The last gear change occurred more than 3 seconds ago.
Select Specific DTC. Enter DTC P0742.
Has the test run and passed?
--
System OK
Begin the diagnosis again. Go to Step 1

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1 Answer

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1 Answer

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& wear out the motor sooner ,over heat the trans & forget
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