Cause | Method of elimination |
| The gear shift lever moves with difficulty or locks up. | Check the gearshift lever. Check the gearshift mechanism and the gearshift lever slider. Check the automatic transmission safety control relay. Check the transmission identification plate (on the housing). |
| Oil leaks at the height of the hydrokinetic transmission after replacing the sealing ring, as well as the transmission pump. | Check the correct installation of the ring in the hydrokinetic transmission housing. Check: – the condition of the rear engine crankshaft seal, as well as the oil pump sealing ring, – the tightening of the aluminum hydrokinetic transmission bolts, the drain plug of the hydrokinetic transmission housing, as well as the weld seam of the hydrokinetic transmission. |
| Traces of oil leaking from the gearbox are visible from the outside. | Check: – the sealing ring on the rear part of the gearbox housing, – the horizontal oil pipes on the housing and their connections, – the adjusting bolt of the front planetary gear drive, – the gasket of the gearshift lever and the gear reduction lever, – the gasket between the rear part of the housing and the control connections, – the oil pan gasket, – the gasket of the speedometer drive cable, – the gasket of the vacuum regulator. |
| Oil leakage without external traces. | Replace the vacuum regulator. |
Launch | |
| The engine does not start, although the starter and battery are in good condition. | Replace the automatic transmission safety control relay. |
| The starter does not engage in positions "R", and also "N". | Adjust the external gear shift mechanism. |
| The engine starts in all gearshift lever positions. | Replace the automatic transmission safety control relay. |
Movement | |
| Gear shifting does not occur or there is no traction. | Check the oil pressure in the automatic transmission. Check the serviceability of the hydrokinetic transmission and oil pump; if necessary, remove and clean the gearbox. Check for mechanical damage to the input shaft of the automatic transmission, turbine, clutch housing or front planetary gear. |
| There is no backward movement when in position "R" (lack of traction; drive friction in positions "D", "2", and also "1". | Check the possibility of engine braking in position "1". Check the oil pressure in the automatic transmission. Check the serviceability of the reverse and direct gear clutch, as well as the rear planetary gear drive. |
| Lack of traction and gear shifting in positions "D", "2", and also "1", whereas in the position "R" the draft is normal. | Check the oil pressure in the automatic transmission. If the pressure is too low in the positions "D", "2", and also "1", then check the rear planetary gear drive, as well as the planetary gear clutch seal. If the pressure is normal, then most likely there is mechanical damage to the front planetary gear or the input shaft of the automatic transmission. |
| Lack of traction and gear shifting in position "D", whereas in the provisions "2" and "1" the draft is normal. | Adjust the external gearshift mechanism. Check the operation of the one-way clutch. Remove and clean the gearbox. |
| Strong friction of the drive in all positions of the gear shift lever. | Adjust the engine idle speed to position "D" to obtain values of 650 – 700 rpm. Check the oil pressure in the automatic transmission. |
| The car has a tendency to automatically start moving forward ("pulls") except for the provisions "R" and "R". | Check the forward clutch for proper operation. Remove and clean the gearbox. |
| Loud mechanical noise while driving. | Check the hydrokinetic transmission for proper operation. Apply the parking brake and also engage the vehicle's hydraulic brake. If in position "N" the noise is normal, and in positions "R" and "D" the noise is loud and increases with increasing engine speed, then the hydrokinetic transmission should be replaced. Otherwise, the gearbox should be removed and cleaned. |
| Excessive mechanical noise while driving. | Internal mechanical damage to the gearbox requiring its removal. |
| Sudden occurrence of abnormal noises and interruptions in traction while driving. | Check the oil level. If the level is normal, check the oil filter. If the oil filter is not too dirty, check the serviceability of the oil pump. |
| The brake band does not clamp in positions "R" and "D" when the engine idle speed is too high, as well as when gear shifting is not performed correctly. | Check the oil pressure in the automatic transmission. Check the serviceability of the reverse and direct gear clutch. Check the serviceability of the rear planetary gear drive. |
| The brake band does not clamp in positions "R" and "D" when the engine idle speed is too high, and when the brake bands are clamped correctly in the positions "D", "2", And "1". | Check engine braking in 1st gear. If braking is insufficient, check the rear planetary gear drive. If braking is correct, repair the reverse and direct gear clutch. |
| Tightening of brake bands is insufficient in position "D" when the engine idle speed is too high, and when the brake bands are not tightened correctly in position "R". | Check the operation in the positions "2" and "1". If the operation is normal, then the one-way clutch is damaged; the gearbox should be removed and repaired. |
| Too little acceleration and too little top speed, although the engine is in good condition. | Remove the hydrokinetic transmission and check its technical condition. |
| Too low maximum speed under normal acceleration and with a healthy engine. | Check the operation of the automatic transmission with the throttle fully open during acceleration (kick-down). If normal, remove and check the hydrokinetic transmission, as well as the one-way clutch. |
Gear shifting | |
| Delayed gear shifting (accelerator pedal slightly pressed) at speeds above 45 km/h: 1500 – 2000 rpm. | Check the connections and condition of the vacuum line, as well as the vacuum regulator. Check the regulator. Check the 1st-2nd gear valve. If it is in good condition, replace the regulator hub gasket. |
| Delayed gear shifting from 1st to 3rd (accelerator pedal slightly pressed) – 1500 – 2000 rpm. | Adjust the front planetary gear brake band. Check the pressure. Check the front planetary gear drive. Check the valve assembly - 1st-2nd gear valve. |
| Delayed gear shifting from 1st to 3rd (accelerator pedal slightly pressed) – 1500 – 2000 rpm. | Check the oil pressure in the automatic transmission. Check the regulator. Check the gear shift lever housing. Check the valve assembly - 2nd-3rd gear valve. Remove and clean the gearbox. |
| In position "D" automatic gear shifting does not occur or 3rd gear does not engage. | Check the oil pressure in the automatic transmission. Check the regulator. Check the operation of the gear shift mechanism. Check the condition of the regulator hub gasket. |
| Too low RPM when shifting gears "kick-down". Gear shifting occurs too early. | Conduct a pressure test. Adjust the gear reduction cable. Check the condition of the regulator hub gasket. |
| Incorrect number of revolutions of gear shifting from 1st to 2nd, as well as from 2nd to 3rd (kick-down). Delayed gear shifting. | Conduct a pressure test. Check the automatic transmission oil level. Check the regulator. Check the operation of the gearshift mechanism. Check the condition of the regulator hub gasket. |
| Loud whistling noise at high engine speeds. | Check the pump intake, suction lines and automatic transmission oil pump. |
| In position "D" by pressing the accelerator pedal all the way down ("kick-down") gear shifting from 3rd to 2nd does not occur at a speed of 75 km/h. | Adjust the gear reduction cable. Check the oil pressure in the automatic transmission. Check the valve "kick-down". |
| In position "D" when the accelerator pedal is pressed 3/4 of its travel, gear shifting from 3rd to 2nd does not occur at a speed of 50 km/h. | Check the operation of the gear shift mechanism. Check the oil pressure in the automatic transmission. Check the valve housing. |
| At a speed of 90 km/h, when the gearshift lever is set from the position "D" in position "1" the car does not slow down when passing through the position "2". | Adjust the front planetary gear brake band. Check the front planetary gear drive. Check the oil pressure in the automatic transmission. |
| At a speed of 90 km/h, when the gearshift lever is set from position "D" in position "1" the car does not slow down when engaging 1st gear at speeds above 75 km/h. | Check the regulator. Check the operation of the gear shift mechanism. Check the oil pressure in the automatic transmission. |
| At a speed of 90 km/h, when the gearshift lever is set from the position "D" in position "1" the car does not slow down when engaging 1st gear at speeds below 25 km/h. | Check the operation of the gear shift mechanism. Check the rear planetary gear drive. Check the oil pressure in the automatic transmission. Check the automatic transmission housing and regulator. |
Parking | |
| Insufficient braking of the vehicle in the position "R". | Adjust the external gear shift mechanism. Check the parking brake mechanism. |
In case of faults number 27, 28 and 29, carry out a test in motion: connect a pressure gauge to the gearbox and measure the pressure in the system at a speed of 80 km/h when the gearshift lever is moved from position "2" to "1". The oil pressure should increase.