DTC P0721 P0722 OUTPUT SPEED SENSOR CIRCUIT PERFORMANCE_NO SIGNAL

• DTC P0722 Output Speed Sensor Circuit No Signal
• DTC P0721 Output Speed Sensor Circuit Performance

• Using ALLISON DOC Software, measure ignition voltage; 9-18V (12V TCM), 18-32V (24V TCM), Is voltage within specified values? If NO, resolve voltage problems refer to DTC P0882 and P0883.

- Disconnect the 80-way connector at the TCM, measure resistance between terminal 40 and 60.

- Disconnect the wiring harness from the output Speed Sensor, measure the resistance between the Speed Sensor terminal.

• Is the Speed Sensor resistance within the specified values?

- Replace the Speed Sensor