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Acura CSX. Manual - part 257

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０６

−

YES

14-109

INPUT SHAFT
(MAINSHAFT)
SPEED SENSOR
CONNECTOR

PCM CONNECTOR B (44P)

NM (WHT/RED)

NM
(WHT/RED)

INPUT SHAFT
(MAINSHAFT)
SPEED SENSOR
CONNECTOR

VCC2 (YEL/BLU)

PCM CONNECTOR B (44P)

VCC2 (YEL/BLU)

18. Check for continuity between PCM connector

terminal B17 and input shaft (mainshaft) speed
sensor connector terminal No. 2.

Go to step 29.

Repair open in the wire between PCM

connector terminal B17 and the input shaft
(mainshaft) speed sensor, then go to step 23.

19. Turn the ignition switch to LOCK (0).

20. Jump the SCS line with the HDS.

21. Disconnect PCM connector B (44P).

22. Check for continuity between PCM connector

terminal B18 and input shaft (mainshaft) speed
sensor connector terminal No. 1.

Go to step 29.

Repair open in the wire between PCM

connector terminal B18 and the input shaft
(mainshaft) speed sensor, then go to step 23.

Wire side of
female terminals

Terminal side of
female terminals

Wire side of
female terminals

Terminal side of
female terminals

Is ther e continuity?

08/08/21 14:41:07 61SNR030_140_0111

−

YES

14-110

Automatic Transmission

23. Reconnect all connectors.

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

25. Clear the DTC with the HDS.

26. Test-drive the vehicle with the shift lever in D at

speeds over 20 km/h (12 mph), and let the
transmission shift through all five gears.

27. Check for Temporary DTCs or DTCs with the HDS.

Check for poor connections or loose

terminals between the input shaft (mainshaft)
speed sensor and the PCM, then go to step 1.

Go to step 28.

28. Monitor the OBD STATUS for P0718 in the DTCs

MENU with the HDS.

Troubleshooting is complete. If any other

Temporary DTCs or DTCs were indicated in step 27,
go to the indicated DTC’s troubleshooting.

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 26.

29. Reconnect all connectors.

30. Update the PCM if it does not have the latest

software (see page 11-227), or substitute a known-
good PCM (see page 11-7).

31. Test-drive the vehicle with the shift lever in D at

speeds over 20 km/h (12 mph), and let the
transmission shift through all five gears.

32. Check for Temporary DTCs or DTCs with the HDS.

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 page 11-7), then
go to step 31. If the PCM was substituted, go to step
1.

Go to step 33.

33. Monitor the OBD STATUS for P0718 in the DTCs

MENU with the HDS.

If the PCM was updated, troubleshooting is

complete. If the PCM was substituted, replace the
original PCM (see page 11-228). If any other
Temporary DTCs or DTCs were indicated in step 32,
go to the indicated DTC’s troubleshooting.

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 page 11-7), then go to step 31. If the PCM was
substituted, go to step 1. If the HDS indicates NOT
COMPLETED, go to step 31.

Is DT C P07 18 indicated?

Does the HDS indicate PASSED?

Is DT C P07 18 indicated?

Does the HDS indicate PASSED?

08/08/21 14:41:07 61SNR030_140_0112

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−

DTC P0721:

DTC P0722:

YES

14-111

PCM CONNECTOR C (44P)

LG2 (BRN/YEL)

LG1 (BRN/YEL)

Problem in Output Shaft

(Countershaft) Speed Sensor Circuit

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 page 14-3).

• This code is caused by an electrical circuit problem

and cannot be caused by a mechanical problem in the
transmission.

1. Check for proper output shaft (countershaft) speed

sensor installation (see page 14-227).

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

3. Clear the DTC with the HDS.

4. 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.

5. Start the engine, disable the VSA by pressing the

VSA OFF switch (if equipped), run 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.

6. Monitor the OBD STATUS for P0721 or P0722 in the

DTCs MENU with the HDS.

Go to step 7.

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.

7. Turn the ignition switch to LOCK (0).

8. Jump the SCS line with the HDS.

9. Disconnect PCM connector C (44P).

10. Check for continuity between PCM connector

terminal C40 and body ground, and between PCM
connector terminal C44 and body ground.

Go to step 11.

Repair open in the wires between PCM

connector terminals C40, C44, and body ground
(G101) (see page 22-16), or repair poor body
ground (G101), then go to step 26.

Terminal side of female terminals

Does the HDS indicate F AILED?

Is ther e continuity?

08/08/21 14:41:07 61SNR030_140_0113

０２

０３

−

YES

14-112

Automatic Transmission

OUTPUT SHAFT (COUNTERSHAFT)
SPEED SENSOR CONNECTOR

VCC1 (YEL/RED)

OUTPUT SHAFT
(COUNTERSHAFT)
SPEED SENSOR
CONNECTOR

VCC1 (YEL/RED)

PCM CONNECTOR C (44P)

VCC1
(YEL/RED)

11. Connect PCM connector C (44P).

12. Disconnect the output shaft (countershaft) speed

sensor connector.

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

14. Measure the voltage between output shaft

(countershaft) speed sensor connector terminal
No. 1 and body ground.

Go to step 19.

Go to step 15.

15. Turn the ignition switch to LOCK (0).

16. Jump the SCS line with the HDS.

17. Disconnect PCM connector C (44P).

18. Check for continuity between PCM connector

terminal C13 and output shaft (countershaft) speed
sensor connector terminal No. 1.

Go to step 32.

Repair open in the wire between PCM

connector terminal C13 and the output shaft
(countershaft) speed sensor, then go to step 26.

Wire side of female terminals

Wire side of
female terminals

Terminal side of
female terminals

Is ther e about 5 V ?

Is ther e continuity?

08/08/21 14:41:08 61SNR030_140_0114

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