The ratio monitoring controls the nominal gear box ratio to the real gear box ratio. While driving in a gear(reverse, first second, third…) there is a calibrated rationality check between turbine speed and output speed of the corresponding gear.While up or down shifting from one gear to another there is a calibrated rationality check between turbine speed and output speed of the corresponding shift. While engaging the gear there is a calibrated rationality check between turbine speed and output speed of the corresponding shift if the actual output speed is higher or equal than a calibrated threshold.While engaging the gear when the actual output speed is lower than the threshold there is a rationality check on the turbine speed.
TCM set this code If detected not properly operation of "Clutch B" in 3rd, 5th and Reverse gear.(MIL ON : 2 driving Cycle)
Item
Detecting Condition
Possible Cause
DTC Strategy
Check function (3rd, 5th and Reverse gear)
Check Engine system
E- Module
Replace ATM
Enable
Conditions
ATF temperature > 0?.
Engine speed > 400rpm.
Input speed > 0rpm.
Input speed : normal.
Inhibitor s/w : Not "P or N" position.
Within 0.5 second after shift.
CASE 1
Output speed = 50rpm
CASE 2
Output speed < 50rpm
Threshold Value
Not shifting and not engaging status
Actual gear ratio > Target gear ratio
Actual gear ratio < Target gear ratio
(Output speed * gear ratio) - Input speed > 320rpm
Diagnostic Time
3times function check
Fail Safe
Fixed at 4th gear
No learning control
(Priority : 3)
The function with the higher priority will aiways take precedence. However, a low-priority is not overruled by a higher priority function.
Functions from different priority categories can also run in parallel. It is important to note which function will take precedence in this case.
In such an event it is possible for a substitute function with low priority not be carried out if a second, higher-priority function is present. This has been taken into account when compiling the priority list and is international.
The mechanical emergency run function must always have the highest priority, since from the electrical standpoint it is the only safe condition.
Fig 1) Shift control solenoid valve