ACCORD 8G 2008-2012 – DTC Troubleshooting: P0721 (9), P0722 (9)

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.
R20A3 Engine Model
  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 (44P).
  1. Check for continuity between PCM connector terminal C40 and body ground, and between terminal C44 and body ground.
Is there continuity?
YES -
Go to Step 11 .
NO -
  1. Connect PCM connector C (44P).
  1. Disconnect the output shaft (countershaft) speed sensor connector.
  1. Turn the ignition switch to ON (II).
  1. Measure the voltage between output shaft (countershaft) speed sensor connector terminal No. 1 and body ground.
Is there about 5 V?
YES -
Go to Step 19 .
NO -
Go to Step 15 .
  1. Turn the ignition switch to LOCK (0).
  1. Jump the SCS line with the HDS.
  1. Disconnect PCM connector C (44P).
  1. Check for continuity between PCM connector terminal C13 and output shaft (countershaft) speed sensor connector terminal No. 1.
Is there continuity?
YES -
Go to Step 19 .
NO -
Repair open in the wire between PCM connector terminal C13 and the output shaft (countershaft) speed sensor, then go to Step 35 .
  1. Turn the ignition switch to LOCK (0).
  1. Jump the SCS line with the HDS.
  1. Disconnect PCM connector C (44P).
  1. Check for continuity between output shaft (countershaft) speed sensor connector terminal No. 2 and body ground.
Is there continuity?
YES -
Repair short to body ground in the wire between PCM connector terminal C43 and the output shaft (countershaft) speed sensor, then go to Step 35 .
NO -
Go to Step 23 .
  1. Check for continuity between PCM connector terminal C14 and output shaft (countershaft) speed sensor connector terminal No. 3.
Is there continuity?
YES -
Go to Step 24 .
NO -
Repair open in the wire between the output shaft (countershaft) speed sensor connector and PCM connector terminal C14, then go to Step 35 .
  1. Connect PCM connector C (44P).
  1. Turn the ignition switch to ON (II).
  1. Measure the voltage between output shaft (countershaft) speed sensor connector terminals No. 2 and No. 3.
Is there about 5 V?
YES -
Go to Step 31 .
NO -
Go to Step 27 .
  1. Turn the ignition switch to LOCK (0).
  1. Jump the SCS line with the HDS.
  1. Disconnect PCM connector C (44P).
  1. Check for continuity between PCM connector terminal C43 and output shaft (countershaft) speed sensor connector terminal No. 2.
Is there continuity?
YES -
Go to Step 41 .
NO -
Repair open in the wire between PCM connector terminal C43 and the output shaft (countershaft) speed sensor, then go to Step 35 .
  1. Connect the output shaft (countershaft) speed sensor connector.
  1. Clear the DTC with the HDS.
  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 -
NO -
Go to Step 41 .
  1. Reconnect all connectors.
  1. Turn the ignition switch to ON (II).
  1. Clear the DTC with the HDS.
  1. Start the engine, disable the VSA by pressing the VSA OFF switch, run the vehicle with the shift lever in D at speeds over 20 km/h (12 mph) for at least 10 seconds. Slow down and stop the wheels.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0721 or P0722 indicated?
YES -
Check for poor connections or loose terminals between the output shaft (countershaft) speed sensor and the PCM, then go to Step 1 .
NO -
Go to Step 40 .
  1. Monitor the OBD STATUS for P0721 or P0722 in the DTCs MENU with the HDS.
Does the HDS indicate PASSED?
YES -
Troubleshooting is complete. If any other Temporary DTCs or DTCs were indicated in Step 39 , go to the indicated DTC's troubleshooting.?
NO -
If the HDS indicates FAILED, check for poor connections or loose terminals between the output shaft (countershaft) speed sensor and the PCM, then go to Step 1 . If the HDS indicates NOT COMPLETED, go to Step 38 .
  1. Reconnect all connectors.
  1. Start the engine, disable the VSA by pressing the VSA OFF switch, run the vehicle with the shift lever in D at speeds over 20 km/h (12 mph) for at least 10 seconds. Slow down and stop the wheels.
  1. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P0721 or P0722 indicated?
YES -
Check for poor connections or loose terminals between the output shaft (countershaft) speed sensor and the PCM. If the PCM was updated, substitute a known-good PCM, then go to Step 43 . If the PCM was substituted, go to Step 1 .
NO -
Go to Step 45 .
  1. Monitor the OBD STATUS for P0721 or P0722 in the DTCs MENU with the HDS.
Does the HDS 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 44 , go to the indicated DTC's troubleshooting.?
NO -
If the HDS indicates FAILED, check for poor connections or loose terminals between the output shaft (countershaft) speed sensor and the PCM. If the PCM was updated, substitute a known-good PCM, then go to Step 43 . If the PCM was substituted, go to Step 1 . If the HDS indicates NOT COMPLETED, go to Step 43 .

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