Honda Civic. Manual — part 197

YES -Repair short to body ground in the wire between PCM connector
terminal B17 and the input shaft (mainshaft) speed sensor, then go to step 32.

NO -Go to step 23.

23. Connect PCM connector B (44P).
24. Turn the ignition switch to ON (II).
25. Measure the voltage between input shaft (mainshaft) speed sensor connector

terminal No. 2 and body ground.

Fig. 102: Measuring Voltage Between Input Shaft (Mainshaft) Speed
Sensor Connector Terminal 2 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there about 5 V?

YES -Replace the input shaft (mainshaft) speed sensor (see INPUT SHAFT
(MAINSHAFT) SPEED SENSOR REPLACEMENT ), then go to step 32.

NO -Go to step 26.

26. Turn the ignition switch to LOCK (0).
27. Disconnect PCM connector B (44P).
28. Check for continuity between PCM connector terminal B17 and input shaft

(mainshaft) speed sensor connector terminal No. 2.

2008 Honda Civic LX

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

Fig. 103: Checking Continuity Between PCM Connector Terminal B17
And Input Shaft (Mainshaft) Speed Sensor Connector Terminal 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Go to step 39.

NO -Repair open in the wire between PCM connector terminal B17 and the
input shaft (mainshaft) speed sensor, then go to step 32.

29. Turn the ignition switch to LOCK (0).
30. Disconnect PCM connector B (44P).
31. Check for continuity between PCM connector terminal B18 and input shaft

(mainshaft) speed sensor connector terminal No. 1.

Fig. 104: Checking Continuity Between PCM Connector Terminal B18
And Input Shaft (Mainshaft) Speed Sensor Connector Terminal 1
Courtesy of AMERICAN HONDA MOTOR CO., INC.

2008 Honda Civic LX

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

Is there continuity?

YES -Go to step 32.

NO -Repair open in the wire between PCM connector terminal B18 and the
input shaft (mainshaft) speed sensor, then go to step 32.

32. Reconnect all connectors.
33. Turn the ignition switch to ON (II).
34. Clear the DTC with the HDS.
35. Test-drive the vehicle with the shift lever in D, and let the transmission shift

through all five gears at speeds over 12 mph (20 km/h).

36. Turn the ignition switch to LOCK (0). Repeat the test-drive in step 35, then go

to step 37.

37. Check for DTCs with the HDS.

Is DTC P0718 indicated?

YES -Check for poor connections or loose terminals between the input shaft
(mainshaft) speed sensor and the PCM, then go to step 1.

NO -Go to step 38.

38. Monitor the OBD STATUS for P0718 in the DTCs MENU with the HDS.

Does the HDS indicate PASSED?

YES -Troubleshooting is complete. If any other DTCs were indicated in step
37, go to the INDICATED DTC'S TROUBLESHOOTING.

NO -If the HDS indicates FAILED, check for poor connections or loose
terminals between the input shaft (mainshaft) speed sensor and the PCM, then
go to step 1. If the HDS indicates NOT COMPLETED, go to step 35.

39. 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 ).

2008 Honda Civic LX

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

40. Test-drive the vehicle with the shift lever in D, and let the transmission shift

through all five gears at speeds over 12 mph (20 km/h).

41. Turn the ignition switch to LOCK (0). Repeat the test-drive in step 40, then go

to step 42.

42. Check for DTCs with the HDS.

Is DTC P0718 indicated?

YES -Check for poor connections or loose terminals between the input shaft
(mainshaft) speed sensor and the PCM. If the PCM was updated, substitute a
known-good PCM (see SUBSTITUTING THE PCM ), then go to step 40. If
the PCM was substituted, go to step 1.

NO -Go to step 43.

43. Monitor the OBD STATUS for P0718 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 42, go to the INDICATED DTC'S
TROUBLESHOOTING.

NO -If the HDS indicates FAILED, check for poor connections or loose
terminals between the input shaft (mainshaft) speed sensor and the PCM. If the
PCM was updated, substitute a known-good PCM (see SUBSTITUTING
THE PCM ), then go to step 40. If the PCM was substituted, go to step 1. If
the HDS indicates NOT COMPLETED, go to step 40.

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 (see GENERAL
TROUBLESHOOTING INFORMATION ).

2008 Honda Civic LX

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