DTC Troubleshooting: P0720 (122)
DTC P0720:
 Output Shaft (Countershaft) Speed Sensor Circuit Malfunction (A/T model)
NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.
  1. Turn the ignition switch to ON (II).
  1. Clear the DTC with the HDS.
  1. Turn the ignition switch to LOCK (0).
  1. Start the engine.
  1. Test-drive under these conditions:
    • Transmission in D position
    • VEHICLE SPEED at 20 km/h (12.5 mph) or more, and ENGINE SPEED at 4,000 rpm (min -1 ) or less
    • During the drive, decelerate (with the throttle fully closed) for 5 seconds
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0720 indicated?
YES -
Go to troubleshooting for DTC P0722 in A/T system, then go to Step 8 in this troubleshooting.
NO -
Go to Step 7 .
  1. Check for DTCs in the A/T system with the HDS.
Is DTC P0722 indicated?
YES -
Go to troubleshooting for DTC P0722 in A/T system, then go to Step 8 in this troubleshooting.
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 the PCM.■
  1. Turn the ignition switch to LOCK (0).
  1. Start the engine.
  1. Test-drive under these conditions:
    • Transmission in D position
    • VEHICLE SPEED at 20 km/h (12.5 mph) or more, and ENGINE SPEED at 4,000 rpm (min -1 ) or less
    • During the drive, decelerate (with the throttle fully closed) for 5 seconds
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0720 indicated?
YES -
Check for poor connections or loose terminals at the output shaft (countershaft) speed sensor and the PCM, then go to Step 1 . If the connector and terminal fits are OK, go to Step 13 .
NO -
Go to Step 12 .
  1. Monitor the OBD STATUS for DTC P0720 in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES -
Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in Step 11 , go to the indicated DTC's troubleshooting.■
NO -
If the screen indicates FAILED, check for poor connections or loose terminals at the output shaft (countershaft) speed sensor and the PCM, then go to Step 1 . If the screen indicates NOT COMPLETED, go to Step 9 .
  1. Update the PCM if it does not have the latest software, or substitute a known-good PCM.
  1. Turn the ignition switch to LOCK (0).
  1. Start the engine.
  1. Test-drive under these conditions:
    • Transmission in D position
    • VEHICLE SPEED at 20 km/h (12.5 mph) or more, and ENGINE SPEED at 4,000 rpm (min -1 ) or less
    • During the drive, decelerate (with the throttle fully closed) for 5 seconds
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0720 indicated?
YES -
Check for poor connections or loose terminals at the output shaft (countershaft) speed sensor and the PCM. If the PCM was updated, substitute a known-good PCM, then go to Step 15 . If the PCM was substituted, go to Step 1 .
NO -
Go to Step 18 .
  1. Monitor the OBD STATUS for DTC P0720 in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES -
If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM. If any other Temporary DTCs or DTCs were indicated in Step 17 , go to the indicated DTC's troubleshooting.■
NO -
If the screen indicates FAILED, check for poor connections or loose terminals at the output shaft (countershaft) speed sensor and the PCM. If the PCM was updated, substitute a known-good PCM, then go to Step 15 . If the PCM was substituted, go to Step 1 . If the screen indicates NOT COMPLETED, go to Step 15 .