DTC Advanced Diagnostics: P0720
DTC P0720:Output Shaft (Countershaft) Speed Sensor Circuit Malfunction

General Description
The powertrain control module (PCM) monitors the speed difference of the wheel speed sensors and output shaft (countershaft) speed sensor to detect malfunctions. If the output shaft (countershaft) speed sensor outputs less than a specified speed despite the other speed sensor's output at a certain speed for a specified time, the PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type
Execution
Continuous
Sequence
None
Duration
5.0 seconds or more
DTC Type
Two drive cycles, MIL on

Enable Conditions
Condition
Minimum
Maximum
Elapsed time since the 12 volt battery voltage reaches to a specified value
5.0 seconds
–
12 volt battery voltage [Battery]
10.4 V
–
State of the engine
Running
[ ]: HDS Parameter

Malfunction Threshold
The output shaft (countershaft) speed sensor outputs less than 1.94 mph (31.13 km/h) despite the other speed sensor's output of 1.94 mph (3.13 km/h) or more for at least 5.0 seconds.

Possible Cause
NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
Output shaft (countershaft) speed sensor failure

Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on and a Confirmed DTC and the freeze data are stored.

Conditions for clearing the DTC
The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command.