A/T

DTC Troubleshooting: P0720

DTC P0720:

Output Shaft (Countershaft) Speed Sensor Circuit Malfunction (A/T)

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information Initial Inspection and Diagnostic Overview.

1. Turn the ignition switch to ON (II).

2. Check for Pending or Confirmed DTCs in the A/T SYSTEM with the HDS.

Is DTC P0722 indicated?

YES -

Troubleshoot for DTC P0722 in the A/T system P0722.

NO -

Go to step 3.

3. Update the PCM if it does not have the latest software ECM/PCM Update, or substitute a known-good PCM.

4. Test-drive under these conditions:

- Engine coolant temperature (ECT SENSOR 1) above 176 °F (80 °C)
- Transmission in D
- ENGINE SPEED between 2,000-4,500 rpm
- Drive for several minutes, then decelerate (with the throttle fully closed) for 5 seconds or more

5. Check for Pending or Confirmed DTCs in the PGM-FI SYSTEM with the HDS.

Is DTC P0720 indicated?

YES -

Go to step 6.

NO -

Go to step 7.

6. Check for Pending or Confirmed DTCs in the A/T SYSTEM with the HDS.

Is DTC P0722 indicated?

YES -

Troubleshoot for DTC P0722 in the AT system P0722.

NO -

If the PCM was updated, substitute a known-good PCM, then go to step 4. If the PCM was substituted, check for poor connections or loose terminals at the output shaft (countershaft) speed sensor and the PCM, then go to step 1.

7. 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 Service and Repair.�

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 4. If the PCM was substituted, go to step 1. If the screen indicates NOT COMPLETED, go to step 4.