DTC P0721: Output Speed Sensor Circuit Range/Performance: DTC Detecting Condition

P0721 OUTPUT SPEED SENSOR CIRCUIT RANGE/PERFORMANCE

Item		Detecting Condition	Possible Cause
DTC Strategy		Check signal range	Faulty in Mechatronics (Valve-body + TCM)
Enable Conditions	CASE1	Sensor supply power: normal No electrical error in sensor
	CASE2	Transmission condition = friction locked Input speed sensor: normal \| Input speed/gear ratio - output speed \| ≥200rpm
	CASE3	Transmission condition = friction locked Not shifting to "D" or "R" Power supply, Input speed sensor, Wheel speed sensor : normal
Threshold Value	CASE1	Signal value > 10000 rpm
	CASE2	Difference with last speed and real speed > -1000rpm
	CASE3	Difference with Wheel speed sensor > 500rpm Difference with Input speed sensor > 200rpm
Diagnostic Time		1 second
Fail Safe		Using Wheel speed No learning control Keep the present gear Fixed at 3rd gear (In case of CASE2 : possible to normal shifting) (priority: 3)

CAUTION:

The function with the higher priority will always 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.