DTC Troubleshooting: P0721 (9), P0722 (9)
DTC P0721:
 Problem in Output Shaft (Countershaft) Speed Sensor Circuit
DTC P0722:
 Problem in Output Shaft (Countershaft) Speed Sensor Circuit (No Signal Input)
NOTE:
  • Before you troubleshoot, record all freeze data and any on-board snapshot with the HDS, and review General Troubleshooting Information.
  • This code is caused by an electrical circuit problem and cannot be caused by a mechanical problem in the transmission.
K24Z3 Engine Model
  1. Check for proper output shaft (countershaft) speed sensor installation.
  1. Turn the ignition switch to ON (II).
  1. Clear the DTC with the HDS.
  1. Raise the front of the vehicle, make sure it is securely supported, and allow the front wheels to rotate freely. Or raise the vehicle on a lift.
  1. Start the engine, disable the VSA by pressing the VSA OFF switch, run the vehicle with the shift lever in D, with the engine speed above 2,000 rpm (min −1 ) for at least 10 seconds. Slow down and stop the wheels.
  1. Monitor the OBD STATUS for P0721 or P0722 in the DTCs MENU with the HDS.
Does the HDS indicate FAILED?
YES -
Go to Step 7 .
NO -
If the HDS indicates PASSED, intermittent failure, the system is OK at this time. Check for poor connections or loose terminals between the output shaft (countershaft) speed sensor and the PCM. If the HDS indicates NOT COMPLETED, go to Step 5 .
  1. Turn the ignition switch to LOCK (0).
  1. Jump the SCS line with the HDS.
  1. Disconnect PCM connector C (49P).
  1. Check for continuity between PCM connector terminal C44 and body ground, and between terminal C48 and body ground.
Is there continuity?
YES -
Go to Step 11 .
NO -
Repair open in the wires between PCM connector terminals C44, C48, and body ground (G101), or repair a poor ground (G101), then go to Step 35 .
  1. Connect PCM connector C (49P).
  1. Disconnect the output shaft (countershaft) speed sensor connector.
  1. Turn the ignition switch to ON (II).