DTC P0721: Problem in Output Shaft (Countershaft) Speed Sensor Circuit NOTE: Record all freeze data and review General Troubleshooting Information before you troubleshoot. This code is caused by an electrical circuit problem and cannot be caused by a mechanical problem in the transmission. Clear the DTC with the HDS. Raise the front of the vehicle, make sure it is securely supported, and allow the front wheels to rotate freely. Or raise the vehicle. Start the engine, disable the VSA by pressing the VSA OFF switch, run the vehicle in the D position with engine speed 2,000 rpm (min −1 ) or higher for more than 10 seconds. Slow down and stop the wheels. Monitor the OBD status for P0721 in the DTCs/Freeze Data in A/T Mode Menu for a pass/fail. Does the result indicate FAILED?
YES | - | Go to Step 5 .
NO | - | Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the output shaft (countershaft) speed sensor and PCM. If the tester indicates NOT COMPLETED, return to Step 3 and recheck.■
Turn the ignition switch OFF. Jump the SCS line with the HDS. Disconnect PCM connector A (31P) and output shaft (countershaft) speed sensor connector. Check for continuity between PCM connector terminals A8 and body ground, and between A9 and body ground. Is there continuity?
YES | - | Go to Step 9 .
NO | - | Repair open in the wire between PCM connector terminals A8, A9, and ground (G101), or repair poor ground (G101), then go to Step 28 .
Connect PCM connector A (31P). Turn the ignition switch ON (II). |