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 target gear ratio and actual gear ratio are not match in condition that 3rd ? 4th gear or 4th ? 3rd gear shifting.(MIL ON : 2 driving Cycle)
Item
Detecting Condition
Possible Cause
DTC Strategy
Gear ratio monitoring
Refer to Engine daignostic system
E- Module
(3rd -> 4th shifting : solenoid valve "2" or 4th -> 3rd shifting : solenoid valve "4"
Replace ATM
Enable
Conditions
within 0.5 second after gear shift to 3rd gear <-> 4th gear.
CASE 1
output speed = 50 rmp
CASE 2
Threshold Value
actual gear ratio = monitoring gear ratio + targer gear ratio
actual gear ratio < targer gear ratio
Not judge.
Diagnostic Time
3times function check.
Fail Safe
Fixed at 3rd gear(bad shifting to 3rd->4th )
Fixed at 4th gear(bad shifting to 4th->3rd )
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) 3rd-4th gear shifting : Shift control solenoid valve2
Fig 2) 4th-3rd gear shifting : Shift control solenoid valve4