4L80E TCC is soft-apply by modulation of the TCC solenoid according to torque requirement, which means the TCC is never fully applied - PCM determines required TCC-apply force by measuring slippage between engine rpm and 4L80E Input Speed Sensor rpm - the TCC solenoid is lower dc resistance to achieve quicker response with the effectively lower voltages applied via the Pulse Width Modulation scheme - PCM applies a fixed frequency, varying the width of the pulses according to torque requirements - narrow pulses = low averaged voltage, TCC is lighty applied - wide pulses = higher averaged voltage, TCC is more firmly applied - there is no hard lockup due to large amounts of torque that can be applied to the hollow input shaft - the 4L80E hollow input shafts have a history of breakage in 3500-series wrecker and dump-truck service, thus the soft-apply scheme
Full Answer
How to test a 4L60E TCC solenoid?
The best way to test the TCC solenoid is to measure the OHMs and make sure its within a suitable range. If it is not, then simply replace it. The video below does a great job of showing and explaining the step by step process for testing and replacing your 4l60e TCC solenoid.
Can I replace the TCC solenoid myself?
If you have ever changed your transmission fluid and filter, then you are capable of replacing the TCC solenoid yourself. The best way to test the TCC solenoid is to measure the OHMs and make sure its within a suitable range. If it is not, then simply replace it.
Where is the Transmission Control Module on a 4L80E?
TRANSMISSION CONTROL MODULE (TCM) The 4L80E Transmission system is equipped with a computer called the Transmission Control Module (TCM), located in the left/rear passenger seat compartment which interprets, ana- lyzes and records electronic signals from sensors and switches located on the engine, brake pedal, and transmission.
Is there a torque converter coupling in a 4L80E transmission?
REMEMBER: Once TCC is applied, there is no torque converter (fluid coupling) assis- tance. Engine or driveline vibrations could be unnoticeable before TCC engagement Page 32 AM General Corporation Page 28 DIAGNOSTIC CODE INFORMATION Additional information useful for diagnosing trouble with the 4L80-E transmission.
How do you test a TCC solenoid with a multimeter?
1:333:08TCC or Torque Converter Solenoid - YouTubeYouTubeStart of suggested clipEnd of suggested clipTo test the TCC solenoid. Apply power to one side of the unit. Either by turning the ignition key onMoreTo test the TCC solenoid. Apply power to one side of the unit. Either by turning the ignition key on or by jumping power to the power feed wire. Then using a test light connected to ground probe.
How many ohms should a TCC solenoid have?
Measure the resistance of all solenoids. The TCC On/Off solenoid should be 12-28 Ohms. The TCC PWM solenoid should be 7-20 Ohms.
How do you check a transmission solenoid with a multimeter?
4:3010:04Shift Solenoid Valve Testing & Replacement P0751 ... - YouTubeYouTubeStart of suggested clipEnd of suggested clipYou have two prongs all that we're doing is we're taking the two leads from the multimeter. AndMoreYou have two prongs all that we're doing is we're taking the two leads from the multimeter. And touching these two prongs. Now the black lead can touch the left or the right prong.
How do I know if my TCC solenoid is bad?
Here are the symptoms that will result in this code:Reduced fuel economy.The check engine light will turn on.Boosted engine RPMs.Overheating transmission.Transmission slipping.Jerky transmission shifting.Shuddering at certain speeds.Flashing overdrive light.
How many ohms should a solenoid read?
0:111:43How to use a Multimeter: Solenoid Testing - Purkeys - YouTubeYouTubeStart of suggested clipEnd of suggested clipIf we put our meter across it we will check and see what the coil resistance. Is with our meterMoreIf we put our meter across it we will check and see what the coil resistance. Is with our meter leads connected. Shows we have a resistance of twelve point three ohms.
How do you unstick a transmission solenoid?
1:128:58How to Replace Transmission Solenoids - YouTubeYouTubeStart of suggested clipEnd of suggested clipBut you may have to tap it with a rubber mallet to get it loose. It should come apart pretty easily.MoreBut you may have to tap it with a rubber mallet to get it loose. It should come apart pretty easily. As you can see the transmission pan separates from the dipstick.
Is there a way to test a transmission solenoid?
3:244:38HOW TO TEST AUTOMATIC TRANSMISSION SOLENOID ON A ...YouTubeStart of suggested clipEnd of suggested clipSet it to ohm readings for resistance. And on the back side attach. Okay the leds to the solenoid.MoreSet it to ohm readings for resistance. And on the back side attach. Okay the leds to the solenoid. On the pwm. Solenoids you should have around five ohms on most cars.
How do you bench test a transmission solenoid?
2:5510:10Automatic Transmission Solenoid Testing on Bench DIY What to ...YouTubeStart of suggested clipEnd of suggested clipNow we've got 70 psi pressure of air going into that solenoid. Now so there's nothing you can't hearMoreNow we've got 70 psi pressure of air going into that solenoid. Now so there's nothing you can't hear any leaks or anything like that at ten point four volts we're going to hit this switch.
How do you bypass a shift solenoid?
To bypass the shift and TCC solenoids, you simply need to connect standard 194 light bulbs to these individual circuits coming from the PCM and then connect the other side of the bulbs to ignition B+. The light bulbs will then serve as a "load" which will simulate the solenoids.
What happens if torque converter clutch solenoid is bad?
When a torque converter clutch solenoid fails in the closed position, it means that the torque converter clutch will be engaged at all times. This will cause the engine to stall when the vehicle comes to a stop.
What happens when torque converter stays locked up?
There are basically three ways a torque converter lockup clutch can fail: It can stay locked up, stalling the engine when the car is braked to a stop; it can never lock up, which shows up as an increase in fuel consumption and radiator temperature; or it can slip when engaged, allowing engine speed surges at a constant ...
What happens when a transmission solenoid goes bad?
Ignoring a warning light or code being thrown by a faulty transmission shift solenoid can lead to serious problems, such as running your vehicle in the wrong gear for your speed and conditions. This can then lead to your transmission overheating and breaking down.
How do you test a TCC solenoid 4l60e?
3:328:304l60e TCC Check. Car Talk. - YouTubeYouTubeStart of suggested clipEnd of suggested clipPretty easy get your voltmeter. Set it to ohms. Make sure you look for a link in the description toMorePretty easy get your voltmeter. Set it to ohms. Make sure you look for a link in the description to buy an ohmmeter two if you need.
What is a TCC circuit malfunction?
P0740: Torque Converter Clutch Circuit Malfunction OBD-II Trouble Code. The presence of a P0740 DTC means that the ECU has detected a problem in the circuit that controls the torque convertor clutch solenoid. A torque converter clutch (TCC) circuit malfunction is what triggers trouble code P0740.
What is TCC PWM solenoid?
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.
What happens when torque converter stays locked up?
There are basically three ways a torque converter lockup clutch can fail: It can stay locked up, stalling the engine when the car is braked to a stop; it can never lock up, which shows up as an increase in fuel consumption and radiator temperature; or it can slip when engaged, allowing engine speed surges at a constant ...
Why does a line pressure solenoid pulse?
The line pressure solenoid is also pwm - PCM pulses it to full pressure every so often to prevent the shuttle-type valve from sticking in it's bore - over a period of time, as mileage accrues, this can be felt at steady speeds as a slight 'bump' - this does not apply to the TCC solenoid
What is the resistance of a solenoid?
They tend to have a +/- factor of 10%. Also when testing a solenoid like this, you have to be careful not to test it too long.
How many ohms does a 1994 C3500 have?
Docdray mentioned in the other thread that his 1994, c3500 4L80e transmission TCC solenoid tests out at 20-40 ohms.
Does a 1992-1995 truck have a hard lockup?
My understanding was that all 1992-1995 trucks with OBD-I had the earlier solenoids, making the 'hard-lockup' mod acceptable, as Bill Heath indicates on his blog.
Does GM mods cause transmission wear?
That being said, it is ALWAYS prudent to be sure you understand the potential for failure, as gmctd suggests; and I would think that using this mod will, over time, cause your transmission to wear more (seems GM did lots of things to hlep prevent wear and tear). Using it prudently is only, well, prudent.
What is a 4L80E transmission?
The Hydra-matic 4L80E is a 4-speed automatic transmission which uses electronic control for smooth shifting. It offers a fourth gear overdrive to increase fuel efficiency. A torque con- verter clutch automatically engages at cruising speeds to improve fuel efficiency. Unlike hydraulically controlled automatic transmissions, the 4L80-E transmission uses electrical sig- nals to specific gear shift solenoids which produce smooth shifts and quiet operation. A neutral safety switch prevents the vehicle from being started if the transmission shift lever is in a position other than P (park) or N (neutral). A transmission warning light on the floor panel next to the shifter will illuminate if there is a problem with the transmission. For increased power, depressing the accelerator to the floor will activate the throttle position sensor kick-down feature and will shift the transmission into one gear range lower than is selected on the gear range lever. The throttle position sensor is located on the fuel Injection pump. Figure 1. 4L80E Transmission. NEED PHOTO OF 4L80E HERE
What is a TCC PWM solenoid?
The TCC PWM solenoid is used to provide smooth engagement of the torque converter clutch by operating on a negative duty cycle percent of “ON” time. Figure 15. Torque Converter Clutch (TCC)PWM Solenoid.
How does TCM work?
In order to troubleshoot and service this transmission, it is important to understand how the TCM and transmission interact with their sensors and control elements. The TCM receives data from various sensors, computes the optimum gear ratio based on the inputs, and causes the transmission to shift into the correct ratio at the best time. • Throttle position (TP) • Transmission Range (TR) Pressure Switch Assembly • Output Speed Sensor (TOSS) • Brake Switch • Input Speed Sensor (TISS) • Transmission Fluid Temperature (TFT)
What is a TP sensor?
The Throttle Position (TP) sensor is a potentiometer, a device for measuring an unknown voltage or potential difference by comparison to a standard voltage. The TP sensor sends a voltage to the TCM, varying from approximately0.5volts to approximately 4.5volts. This voltage signal to the TCM represents throttle shaft angle. At closed throttle, the signal voltage to the TCM is approximately 0.5volts. As the throttle shaft angle increases, the signal voltage increases to greater than 4.5volts at wide open throttle. The TP sensor is attached to the injector pump assembly (Figure 7). Figure 7. Throttle Position (TP) Sensor.
What is a TCM?
The sole- noids control the transmission operating pressures, upshift and downshift patterns and torque converter clutch (TCC) operations. A removable computer chip called a programmable read only memory (PROM) is used. The PROM programs the TCM for vehicle characteristics including weight, axle ratio, engine size, etc. The PROM differs within each TCM for transmission model year and HMMWV application. Figure 5. Transmission Control Module (TCM). Table 1: PROM Application Chart
What is a 1 / 2 / 3 shift solenoid?
1–2 / 2–3 Shift Solenoid. These electrical devices are used to con- trol fluid flow acting on the 1-2 and 3-4 shift valves. The solenoids are normally open exhaust valves that are used with the 2-3 shift solenoid to allow four different shifting com- binations. The solenoid is attached to the control valve body within the transmission. Figure 14. Shift Solenoids.
Where is the J2 connector located?
J2 Data Link Connector (DLC). This connector is located on the TCM waterproof box under the left/rear seat. Trouble codes may be accessed by connecting the Diagnostic Switch Cable to the TCM J-2 connector and turning the ignition switch to the “RUN” position. If a Diagnostic Switch Cable is not available, use a jumper wire to jump across terminals “” and “AE” of the DLC J2 connector. Figure 6. Data Link J2 Connector (DLC).
What to do if your solenoid tester does not light?
If the tester does not light, replace the solenoid. If the tester does light, but the problem persists, take your car to a mechanic.
How many volts does a transmission tester need?
Note: some transmissions, like the 125C, must shift to third gear before the tester will light. If the tester lights, you have 12 volts to terminal A at the transmission. If the tester does not light, then check for 12 volts by the regular method.
What causes a torque converter clutch to disengage?
There is a solenoid in your GM converter that causes the the torque convertor clutch (TCC) to engage and disengage. When the TCC solenoid receives a signal from the engine control module (ECM), it opens a passage in the valve body and hydraulic fluid applies the TCC.
What happens if a torque converter fails?
If the TCC fails to disengage when the vehicle comes to a stop, the engine will stall .
How to check a transmission?
Test #1 (Quick Method) 1 Connect one end of a test light to terminal A at the ALDL. 2 Connect the other end to terminal F at the ALDL. 3 Turn on the ignition and the tester should light. Note: some transmissions, like the 125C, must shift to third gear before the tester will light. 4 If the tester lights, you have 12 volts to terminal A at the transmission. 5 If the tester does not light, then check for 12 volts by the regular method.
How many volts to terminal A?
Before you begin this test, use a test light or multimeter to check for 12 volts to terminal A at the transmission. Once you've done so successfully, you can proceed with the following steps:
What should be done before diagnosing a converter clutch?
Before attempting to diagnose converter clutch electrical problems, mechanical checks such as linkage adjustments and oil level should be performed and corrected as needed.
Does a PCM need to be driven with a scan tool?
ok it needs to be driven with a scan tool to make sure of a few things.first need to make sure the brake switch signal is not on and then that the PCM is commanding the lock up on.both will show in a data list when driving the truck while looking at the data with a scan tool.we need to make sure about those 2 things before we go further
Does a 4L80E downshift?
4L80E will downshift when in drive as I gain speed , just drops from 4th to 3rd and will not go back to 4th, just rebuilt still at the shop… read more
How to tell if a 4l60e has a TCC solenoid?
When your 4l60e’s TCC solenoid begins to fail, there are a number of obvious signs. The main symptom of a TCC solenoid failure is the converter is not locking up. When the converter is not locking up you will notice the engine’s RPMs staying higher under load at highway speeds.
Where is the solenoid on a 4L60E?
The 4l60e TCC Solenoid is located on the front passenger side of the transmission near the valve body. The image below shows the locations of various solenoids.
Can a TCC solenoid lock up?
Until engine temps reach a certain point, the TCC solenoid will not allow for lock up.
Can you replace a 4L60E solenoid?
Testing and replacing your 4l60e TCC solenoid is not as daunting of a task as you may think. If you have ever changed your transmission fluid and filter, then you are capable of replacing the TCC solenoid yourself.
