Honda Civic. Manual — part 199

YES -Go to step 22.

NO -Repair open in the wire between the output shaft (countershaft) speed
sensor connector and PCM connector terminal C14, then go to step 32.

22. Connect PCM connector C (44P).
23. Turn the ignition switch to ON (II).
24. Measure the voltage between output shaft (countershaft) speed sensor

connector terminals No. 2 and No. 3.

Fig. 110: Measuring Voltage Between Output Shaft (Countershaft) Speed
Sensor Connector Terminals 2 And 3
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there about 5 V?

YES -Go to step 28.

NO -Go to step 25.

25. Turn the ignition switch to LOCK (0).
26. Disconnect PCM connector C (44P).
27. Check for continuity between PCM connector terminal C43 and output shaft

(countershaft) speed sensor connector terminal No. 2.

2008 Honda Civic LX

2006-08 TRANSMISSION Automatic Transmission - Civic (Except Hybrid)

Fig. 111: Checking Continuity Between PCM Connector Terminal C43
And Output Shaft (Countershaft) Speed Sensor Connector Terminal 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Go to step 38.

NO -Repair open in the wire between PCM connector terminal C43 and the
output shaft (countershaft) speed sensor, then go to step 32.

28. Connect the output shaft (countershaft) speed sensor connector.
29. Clear the DTC with the HDS.
30. Test-drive the vehicle with the shift lever in D and the engine speed 2,000 rpm

or higher, for at least 10 seconds. Slow down and stop the wheels.

31. Monitor the OBD STATUS for P0721 or P0722 in the DTCs MENU with the

HDS.

Does the HDS indicate FAILED?

YES -Replace the output shaft (countershaft) speed sensor (see OUTPUT
SHAFT (COUNTERSHAFT) SPEED SENSOR REPLACEMENT ), then
go to step 32.

NO -Go to step 38.

32. Reconnect all connectors.
33. Turn the ignition switch to ON (II).

2008 Honda Civic LX

2006-08 TRANSMISSION Automatic Transmission - Civic (Except Hybrid)

34. Clear the DTC with the HDS.
35. Test-drive the vehicle with the shift lever in D at speeds over 12 mph (20

km/h), for at least 10 seconds. Slow down and stop the wheels.

36. Check for 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 37.

37. 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 DTCs were indicated in step
36, 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 35.

38. Update the PCM if it does not have the latest software (see UPDATING THE

PCM ), or substitute a known-good PCM (see SUBSTITUTING THE
PCM ).

39. Test-drive the vehicle with the shift lever in D at speeds over 12 mph (20

km/h), for at least 10 seconds. Slow down and stop the wheels.

40. Check for 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 (see SUBSTITUTING THE PCM ), then go to step 39. If
the PCM was substituted, go to step 1.

2008 Honda Civic LX

2006-08 TRANSMISSION Automatic Transmission - Civic (Except Hybrid)

NO -Go to step 41.

41. 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 (see ECM/PCM REPLACEMENT ). If
any other DTCs were indicated in step 40, 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 (see SUBSTITUTING
THE PCM ), then go to step 39. If the PCM was substituted, go to step 1. If
the HDS indicates NOT COMPLETED, go to step 39.

DTC P0723: Output Shaft (Countershaft) Speed Sensor Intermittent Failure

1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Test-drive the vehicle with the shift lever in D with engine speed 2,000 rpm or

higher, and let the transmission shift through all five gears.

4. Turn the ignition switch to LOCK (0). Repeat the test-drive in step 3, then go

to step 5.

5. Monitor the OBD STATUS for P0723 in the DTCs MENU with the HDS.

NOTE:

Before you troubleshoot, record all freeze data and any
on-board snapshot with the HDS, and review General
Troubleshooting Information (see GENERAL
TROUBLESHOOTING INFORMATION ).

This code is caused by an electrical circuit problem and
cannot be caused by a mechanical problem in the
transmission.

2008 Honda Civic LX

2006-08 TRANSMISSION Automatic Transmission - Civic (Except Hybrid)