Mechanical and hydraulic faults
| Mechanical and hydraulic faults |
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Fault
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Possible causes
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Diagnostic procedure
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Engine cannot be started.
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Selector lever not in position P or N.
Selector lever position sensor out of adjustment. |
Adjust the selector lever position sensor.
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Car cannot be driven in selector lever positions D, 3, 2, 1 or else slippage or jerkiness occurs.
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The transmission fluid level is too low.
The filter strainer beside the oil pump inlet is choked. The oil pump is blocked. Loss of fluid in clutch C1 or in the fluid system. Loss of fluid in brake band B4's fluid system. Freewheel F2 defective. Freewheel F3 defective. Loss of fluid in brake B3 or in the fluid system. Valve housing defective. The torque converter is blocked. |
Correct the transmission fluid level.
Change the gearbox. |
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Car cannot be driven in selector lever position R.
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The transmission fluid level is too low.
The filter strainer beside the oil pump inlet is choked. The oil pump is blocked. The 1-2/3-4 shift solenoid (S1) or shifting valve in the valve housing is blocked. Loss of fluid in clutch C2 or the fluid system. Loss of fluid in brake B3 or in the fluid system. Loss of fluid in brake band B4's fluid system. Loss of fluid in clutch C3 or the fluid system. The torque converter is blocked. The valve housing is defective. |
Correct the transmission fluid level.
Change the gearbox. |
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No 1-2 upshifting.
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Selector lever in position 1.
Selector lever position sensor out of adjustment. The 1-2/3-4 shift solenoid (S1) or shifting valve in the valve housing is blocked. Loss of fluid in brake B1 or in the fluid system. Loss of fluid in brake B2 or in the fluid system. Freewheel F1 defective. Valve housing defective. |
Adjust the selector lever position sensor.
Change the shift solenoid (S1). Change the gearbox. |
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No 2-3 upshifting.
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Loss of fluid in clutch C3 or the fluid system.
The 2-3 shift solenoid (S2) or shifting valve in the valve housing is blocked. |
Change the shift solenoid (S2).
Change the gearbox. |
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No 3-4 upshifting in selector lever position D.
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Loss of fluid in clutch C3 or the fluid system.
The 1-2/3-4 shift solenoid (S1) or shifting valve in the valve housing is blocked. Transmission fluid temperature sensor defective. |
Change the shift solenoid (S1).
Change the transmission fluid temperature sensor. Change the gearbox. |
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No 4-3 downshifting on kickdown.
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Kickdown switch defective
Loss of fluid in clutch C2 or the fluid system. The 1-2/3-4 shift solenoid (S1) or shifting valve in the valve housing is blocked. Freewheel F1 defective. |
Change kickdown switch
Change the shift solenoid (S1). Change the gearbox. |
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No 3-2 downshifting on kickdown.
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Kickdown switch defective
The 2-3 shift solenoid (S2) or shifting valve in the valve housing is blocked. Loss of fluid in brake B4. Freewheel F3 defective. |
Change kickdown switch
Change the shift solenoid (S2). Change the gearbox. |
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No 2-1 downshifting on kickdown.
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Kickdown switch defective
The 1-2/3-4 shift solenoid (S1) or shifting valve in the valve housing is blocked. Freewheel F2 defective. |
Change kickdown switch
Change the shift solenoid (S1). Change the gearbox. |
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Engine braking in selector lever position 1 ineffective.
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Loss of fluid in brake B3 or the shifting valve.
The 1-2/3-4 shift solenoid (S1) or shifting valve in the valve housing is blocked. |
Change the shift solenoid (S1).
Change the gearbox. |
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Engine braking in selector lever position 2 ineffective.
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Loss of fluid in brake band B4's fluid system.
Loss of fluid in brake B1 or the shifting valve. The 2-3 shift solenoid (S2) or shifting valve in the valve housing is blocked. |
Change the shift solenoid (S2).
Change the gearbox. |
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Engine braking in selector lever position 3 ineffective.
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Loss of fluid in brake B1 or in the fluid system.
Loss of fluid in clutch C3 or the fluid system. The 1-2/3-4 shift solenoid (S1) or shifting valve in the valve housing is blocked. |
Change the shift solenoid (S1).
Change the gearbox. |
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Rough N-D shifting.
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Valve housing defective.
Clutch C1's pressure chamber defective. Loss of fluid in clutch C1 or the fluid system. Loss of fluid in brake band B4's fluid system. Freewheel F2 defective. Freewheel F3 defective. |
Change the gearbox.
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Rough N-R shifting.
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Valve housing defective.
Clutch C2's pressure chamber defective. Loss of fluid in clutch C2 or the fluid system. Loss of fluid in brake B3 or in the fluid system. Loss of fluid in brake band B4's fluid system. |
Change the gearbox.
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Rough shifting in all gears.
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Valve housing defective.
Pressure chamber defective. Loss of fluid in disc clutch or multiple disc clutch, or in the fluid system |
Change the gearbox.
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Torque converter clutch does not engage.
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Solenoid valve for the torque converter clutch defective.
Valve housing defective. Torque converter defective. |
Change the LOCK-UP solenoid valve (SL).
Change the gearbox. |
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