1-2 Shift valve is shift to oil-pathway in order to maintain over the 2nd gear shifting. 1-2 Shift valve function is deliver oil-perssure to clutch that over the 2nd grar operation element, When 1-2 shifting.
TCM set this code If the rear gear ratio that calculated by Engine speed/Output speed and the target gear ratio that calculated by compounding of solenoid valves are not match.
Item
Detecting Condition
Possible Cause
DTC Strategy
Valve Stuck
Valve-body
A/T Assembly
1: The detection criteria of S3 ON fail and 1-2 shift valve SP stick is the same, so if this detection criteria is fullfilled, then both S3 ON DTC and 1-2 shift valve DTC are stored. But if present gear judged 1st and current gear 2nd before this detection criteria is fullfilled, then only the DTC of 1-2 shift valve SP stick is stored.
S3 ON fail and 1-2 shift valve SP stick can be distinguished by what present gear is made at current gear 2nd(Not 2nd EB).S3 ON fail : Current gear 2nd then present gear 2nd1-2 shift valve SP stick : Current gear 2nd then present gear 1st
Enable Conditions
10.2V < Battery voltage < 14V
Not error in system
CAN communication : normal.
Solenoid valve : normal
Threshold Value
Current gear 4th and Present gear 3rd
Current gear 5th and Present gear neutral
Diagnostic Time
Immediately
Fail Safe
1st and 2nd gear inhibit at Manual mode
* Only 1st and 2nd gear inhibit at Manual mode fail safe
After 2 driving cycle of above detection continuously
No up shift 4th, 5th and 6th
1-2 shift valve stick decision
? Not manual mode or
? Manual mode and speed < 80km/h
Fig 1) D Range-1st gear
Fig 2) D Range-2nd gear
Fig 3) Sports mode -1st gear
Fig 4) Sports mode -2nd gear
Fig 5) Sports mode -3rd gear
Fig 6) Sports mode -4th gear
Fig 7) Sports mode -5th gear
Fig 8) Sports mode -6th gear
Fig 9) Reverse