Automatic transmission, lag in drive and jerkiness with shift up
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Automatic transmission, lag in drive and jerkiness with shift up
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Fault symptom
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3.
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Jerkiness or lag when accelerator pressed
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4.
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Automatic transmission drive lags when shifting up from 2nd to 3rd gear.
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Conditions
When shifting up from 2nd to 3rd gear, drive from the automatic transmission can lag for a short period. In connection with this, the engine speed increases and shifting ends with a small jerk.
This is due to the transmission oil pressure decreasing under certain conditions to a level which is too low. This means that the clutches do press together firmly enough.
The fault most often occurs when the driver has driven constantly in 5th gear at a speed between 90-120 km/h for approx. 30 minutes and has then stopped or reduced speed to less than 30 km/h. When a subsequent shift from 2nd to 3rd gear takes place, the above may occur.
Action
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Reprogram the TCM using the diagnostic tool and TIS2000 version 2003-3 (update 5) or later. See WIS - General - TIS2000 - Technical description - Service Programming System.
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