Transmission malfunction alarm
Gearbox abnormality is indicated on the instrument or the gear light is illuminated Restarting can briefly return to normal or keep shifting shock is usually a gearbox malfunction alarm A computerized test can be used to determine the malfunction.
Tip: When the vehicle is in use, the gear light on the instrument is lit or the information platform suggests that the transmission is faulty, and at the same time, the vehicle will have a shift shock, which means that there is a malfunction in the transmission. The system is in emergency mode and needs to be tested and repaired.
Common Failures:
1. Failure of the electronic components of the transmission
Solution: Computerized testing and replacement of damaged electronic components.
2. Serious wear and tear of the mechanical components of the gearbox
Solution: Repair the damaged mechanical components.
3. Engine or ABS failure sends out wrong signals and interferes with the gearbox salary.
Solution: Test the engine and ABS, repair the damaged electrical components.
Note to vehicle owners:A malfunction alarm in the transmission is not always a complete transmission failure, and must be checked at a regular transmission repair shop. Never disassemble blindly.
Transmission Valve Body Failures
Transmission failures caused by the valve body can now be repaired without replacing the valve body. The valve body is now more durable with improved Sonex parts.
Tip: When changing gears in the vehicle, there is obvious vibration or engine idling when accelerating or decelerating, weak acceleration, and no upshift is generally a gearbox shift fault.
Common Failures:
1. Transmission clutch aging
Solution: Repair or replace the clutch
2. Valve body wear and stagnation
Solution: Repair or replace the valve body
3. Torque converter failure
Solution: Repair or replace the torque converter
4. Abnormal computer control
Solution: Match or replace the control module
5. Engine load signal is abnormal
Solution: Repair engine system
6. Vehicle speed signal is not normal
Solution: Repair ABS system
7. Signal interference caused by illegal modification
Solution: Remove the modified parts to restore the abnormal configuration
8. Signal interference caused by ignition components
Solution: Replace the original spark plugs and ignition coils.
9. Transmission fault code
Solution: Clear the fault code
Note to car owners:Automatic transmission design is complex, the internal components of the oil circuit mixed control, faults are not easy to distinguish, but also by the engine and chassis signals, more difficult to diagnose, the general repair shop does not have the ability to repair, 4S store replacement method to make the repair fee is very expensive, so, find a professional transmission repair shop, so that experienced transmission repair technicians to accurately determine the faults can save a lot of time and cost.
Clutch Slipping
Clutch slippage means that the slip rate of the clutch exceeds the design limit, and the engine speed rises, but the vehicle speed does not rise with it.
Tip: In the use of the vehicle, step on the accelerator pedal, the engine speed increases, the speed will not rise with the shift moment sender idling obviously, the computer detects the P0730 speed ratio is not correct or gear monitoring error fault code, these are clutch slippage, encounter these problems, do not step on the accelerator pedal, so as not to cause serious damage to the transmission.
Common Faults
1. Worn clutch
Solution: Repair or replace the clutch
2. Bad sealing of clutch piston
Solution: Replace the piston or sealing repair kit
3. Valve body not working well
Solution: Repair or replace the valve body
4. Computer tuning over the limit
Solution: Restore the computer to factory settings
Note to owners:Transmission clutch slippage is a more serious fault, driving with the fault will cause a lot of collateral damage, resulting in the replacement of serious losses.
Locking Shake
Locking jerks are generally caused by poor torque converter operation, which can be repaired with special equipment.
Tip: Vehicle in driving, stabilize the throttle, speed between 20-80 kilometers similar to the engine fire or pressure on the rubbing board road jitter, accompanied by the engine tachometer up and down fluctuations, this fault is generally caused by the lock-up clutch shaking.
Common Faults
1.TCC friction plate aging
Solution: Replace the TCC friction plate
2. Leakage in TCC control oil circuit
Solution: Repair the leakage point
3. TCC control plunger is worn or stuck.
Solution: Repair or replace the valve body
4. Wrong filling of transmission fluid
Solution: Replace with appropriate fluid and fill with antifibrillation agent.
Note to owners:the transmission lock-up clutch failure phenomenon is not obvious, the failure point is not easy to find, the repair must be experienced technicians more test drive to determine the fault, in order to repair.
Gear Shift Failure
Not all shifting faults are transmission problems
Tip: vehicle in use when changing gears, acceleration or deceleration of the vehicle appears obvious vibration or engine idling, acceleration is weak, not upshifting is generally a transmission shift fault.
Common Faults
1. Transmission clutch aging
Solution: Repair or replace the clutch
2. Valve body wear and stagnation
Solution: Repair or replace the valve body
3. Torque converter failure
Solution: Repair or replace the torque converter
4. Abnormal computer control
Solution: Match or replace the control module
5. Engine load signal is abnormal
Solution: Repair engine system
6. Vehicle speed signal is not normal
Solution: Repair ABS system
7. Signal interference caused by illegal modification
Solution: Remove the modified parts to restore the abnormal configuration
8. Signal interference caused by ignition components
Solution: Replace the original spark plugs and ignition coils.
9. Transmission fault code
Solution: Clear the fault code
Note to vehicle owners:Automatic transmission design is complex, the internal components of the oil circuit mixed control, faults are not easy to distinguish, but also by the engine and chassis of the signal impact, more difficult to diagnose, the general repair shop does not have the ability to repair, 4S store replacement method to make the repair fee is very expensive, so, find a professional transmission repair shop, so that experienced transmission repair technicians to accurately determine the faults can save a lot of time and cost.
Transmission oil leaks
Transmission leaks must be repaired in a timely manner Driving without oil in the transmission can lead to serious damage to internal components.
Tip: Most of the transmission fluid is red, now the new transmission has blue (such as Mercedes-Benz), green (such as Nissan CVT), cooking oil color (such as BMW), when your car under the similar color of the fluid, you need to timely inspection and repair.
Reasons for oil leakage
1. Aging of sealing elements
Solution: Check the oil leakage area
2. Poor material of sealing element
Solution: Replace the corresponding seals
3. Worn positioning
Solution: Repair or replace the worn positioning
4. Excessive oiling
Solution: Pump out the excessive transmission fluid.
5. Broken oil pipe
Solution: Repair or replace the gearbox oil pipe.
Owners Note: Transmission oil leakage is not a big problem, but must be repaired in a timely manner, the transmission lack of oil will cause serious damage to internal components.
Water in the transmission
If the transmission fluid turns milky white or there are rust stains on the internal steel fittings, it means that the transmission has water in it.
Tip: Water in the gearbox is a very serious problem, which can lead to overhauling of the gearbox or scrapping of the gearbox. So once you find signs of water ingress, you must find the root cause of the problem and repair it in time.
Reasons for water ingress:
1. When the vehicle is involved in water, water enters from the oil seals and air vents.
Solution: disassemble and clean all gearbox parts
2. Poor vehicle maintenance of poor-quality coolant to the radiator corrosion caused by broken
Solution: Replace the repair kit
3. The cooling oil pressure is too high and breaks through the radiator.
Solution: Replace the radiator and high-quality coolant
Some vehicles have air-cooled gearboxes, so there is no need to consider the problems of 2 and 3.
Note to owners: water in the transmission, the performance of the fault is very hidden, not easy to find. When the vehicle is traveling with anomalies, the transmission has been seriously damaged, when the coolant is often missing no external leakage point or coolant oil stains, may be caused by water in the transmission, must pay attention to timely maintenance.
Transmission rattling
Transmission noise is caused by abnormal gear meshing or bearing positioning wear can be repaired by replacing the damaged parts.
Tip: If you hear abnormal sound from the transmission when the vehicle is in use, and it will increase with the engine speed or the speed of the vehicle, you must stop the vehicle immediately for inspection and repair to avoid causing more damage.
Reasons for abnormal sound
1. Bearing fatigue wear, surface hardening layer peeling off
Solution: Replace the damaged bearing
2. Gear fatigue wear, surface hardening layer peeling off
Solution: Replace the damaged gear
3. Positioning wear, resulting in abnormal gear meshing or interference with component operation.
Solution: Repair the worn positioning
4. Abnormal oil pressure, sound when regulating the pressure limiting valve
Solution: Repair the valve body and adjust the abnormal oil pressure.
Note to owners: all mechanical, hydraulic, electrical and other components in operation will make a specific sound, these sounds are normal and do not require repair.
Transmission High Temperature
Transmission oil temperature is normally between 90-100 degrees, if the temperature is higher than the upper limit for a long time, it will cause serious damage to the transmission.
Tip: Vehicles driving slower and slower, parked for more than an hour, and everything is normal, which is generally caused by high temperature of the transmission, especially in the summer traffic jams or long time running on the highway is more obvious.
Reasons for high temperature
1. High engine and water temperature affects the heat dissipation of the gearbox.
Solution: Repair the engine
2. Spreading hot air grille blockage
Solution: Clean the radiator
3. Gearbox clutch slipping, generating additional heat
Solution: Repair the clutch
4. Insufficient flow of gearbox cooling oil circuit
Solution: Repair the valve body or replace the oil pump
5. Stuck thermostat
Solution: Replace the thermostat
Note to owners: 90% of the transmission damage is caused by high temperature, the high temperature of the transmission in the use of no obvious failure phenomenon, a long time of high temperature will lead to the internal seals of the transmission aging, plastic parts embrittlement, the lubrication of the oil decreases, the life of the electrical components to shorten the life, so you must often measure the oil temperature of the transmission, there are problems in a timely manner to solve.
