Transmission problems, code PO716

Tiny
BDEWATER69
  • MEMBER
  • 2007 HONDA ACCORD
  • 2.4L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 50,000 MILES
Installed a new engine into the car listed above. New engine under 50,000 up to old transmission with 189,000. No leaks or bad wires. All gears work except reverse. Put it into reverse and it acts like it's in neutral. Drove it in drive and now the d is flashing and engine is on. Checked the code with obd reader and it's throwing po716 code. So if I change the transmission input/turbine speed sensor should the reverse start working?
Do you
have the same problem?
Yes
No
Monday, February 22nd, 2021 AT 4:34 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • EXPERT
Hi,

This specific code is caused by an electrical issue and not a mechanical one. I suspect if you replace the input speed sensor, it will do the same thing. I have a feeling something isn't fully connected or a wire was damaged during the engine install. It could be related to a ground issue with the PCM.

What I suggest is to follow the directions which are specific diagnostics for this code. The pictures below correlate with the directions.

_____________________________________

2007 Honda Accord L4-2.4L
DTC Troubleshooting
Vehicle ALL Diagnostic Trouble Codes ( DTC ) Testing and Inspection P Code Charts P0716 DTC Troubleshooting
DTC TROUBLESHOOTING
DTC P0716: Problem in Input Shaft (Mainshaft) Speed Sensor Circuit

NOTE:
- Before you troubleshoot, record all freeze data and any on-board snapshot, 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.

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Check for proper input shaft (mainshaft) speed sensor installation.
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 hoist.
5. Start the engine, run the vehicle in the D position, and hold the vehicle at speeds over 30 mph (48 km/h) for more than 10 seconds. Slow down and stop the wheels.
6. Monitor the OBD STATUS for P0716 in the DTCs MENU with the HDS.
Does the screen indicate FAILED?
YES - Go to step 7.
NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals between the input shaft (mainshaft) speed sensor and the PCM. If the screen indicates NOT COMPLETED, go to step 5.

7. Turn the ignition switch OFF.
8. Jump the SCS line with the HDS.
9. Disconnect PCM connector A (31P) and the input shaft (mainshaft) speed sensor connector.
10. Check for continuity between PCM connector terminal A8 and body ground, and between PCM connector terminal A9 and body ground.

Pic 1

Is there continuity?
YES - Go to step 11.
NO - Repair open in the wires between PCM connector terminals A8, A9, and ground (G101), or repair poor ground (G101), then go to step 31.

11. Connect PCM connector A (31P).
12. Turn the ignition switch ON (II).
13. Measure voltage between input shaft (mainshaft) speed sensor connector terminal No. 1 and body ground.

Pic 2

Is there about 5 V?
YES - Go to step 14.
NO - Go to step 26.

14. Turn the ignition switch OFF.
15. Disconnect PCM connector C (22P).
16. Check for continuity between input shaft (mainshaft) speed sensor connector terminal No. 2 and body ground.

Pic 3

Is there continuity?
YES - Repair short to body ground in the wire between PCM connector terminal C19 and the input shaft (mainshaft) speed sensor, then go to step 31.
NO -
- Go to step 18.

17. Check for continuity between input shaft (mainshaft) speed sensor connector terminal No. 3 and body ground.

Pic 4

Is there continuity?
YES - Connect PCM connector C (22P), and go to step 20.
NO - Repair open in the wire between the input shaft (mainshaft) speed sensor and ground (G101), then go to step 31.

18. Disconnect PCM connector A (31P).
19. Check for continuity between input shaft (mainshaft) speed sensor connector terminal No. 3 and PCM connector terminal A24.

Pic 5

Is there continuity?
YES - Connect PCM connectors A (31P) and C (22P), and go to step 20.
NO - Repair open in the wire between the input shaft (mainshaft) speed sensor and PCM connector terminal A24, then go to step 31.

20. Turn the ignition switch ON (II).
21. Measure voltage between input shaft (mainshaft) speed sensor connector terminals No. 2 and No. 3.

Pic 6

Is there about 5 V?
YES - Go to step 22.
NO - Go to step 30.

22. Connect the input shaft (mainshaft) speed sensor connector.
23. Measure voltage between PCM connector terminals C19 and A9.

Pic 7

Is the voltage 0 V or about 5 V?
YES - Go to step 24.
NO - Replace the input shaft (mainshaft) speed sensor, then go to step 31.

24. Shift to the P position. Start the engine, and let it idle.
25. With the engine idling, measure voltage between PCM connector terminals C19 and A9.

Pic 8

Is there 1.5-3.5 V?
YES - Go to step 37.
NO - Replace the input shaft (mainshaft) speed sensor, then go to step 31.

26. Measure voltage between PCM connector terminals A21 and A9.

Pic 9

Is there about 5 V?
YES - Repair open in the wire between PCM connector terminal A21 and the input shaft (mainshaft) speed sensor, then go to step 31.
NO - Go to step 27.

27. -Turn the ignition switch OFF.
28. Disconnect PCM connector A (31P).
29. Check for continuity between PCM connector terminal A21 and body ground.

Pic 10

Is there continuity?
YES - Repair short to body ground in the wire between PCM connector terminal A21 and the input shaft (mainshaft) speed sensor, then go to step 31.
NO - Go to step 37.

30. Measure voltage between PCM connector terminals C19 and A9.

Pic 11

Is there about 5 V?
YES - Repair open in the wire between PCM connector terminal C19 and the input shaft (mainshaft) speed sensor, then go to step 31.
NO - Go to step 37.

31. Reconnect all connectors.
32. Turn the ignition switch ON (II).
33. Clear the DTC with the HDS.
34. Start the engine, run the vehicle in the D position and hold the vehicle at speeds over 30 mph (48 km/h) for more than 10 seconds. Slowdown and stop the wheels.
35. Check for DTCs with the HDS.
Is DTC P0716 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 36.

36. Monitor the OBD STATUS for P0716 in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES - Troubleshooting is complete. If any other DTCs were indicated in step 35, go to the indicated DTC's troubleshooting.
NO - If the screen 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 screen indicates NOT COMPLETED, go to step 34.

37. Update the PCM if it does not have the latest software, or substitute a known good PCM.
38. Start the engine, run the vehicle in the D position and hold the vehicle at speeds over 30 mph (48 km/h) for more than 10 seconds. Slow down and stop the wheels.
39. Check for DTCs with the HDS.
Is DTC P0716 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, then go to step 38. If the PCM was substituted, go to step 1.
NO - Go to step 40.

40. Monitor the OBD STATUS for P0716 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. If any other DTCs were indicated in step 39, go to the indicated DTC's troubleshooting.
NO - If the screen 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, then go to step 38. If the PCM was substituted, go to step 1. If the screen indicates NOT COMPLETED, go to step 38.

___________________________________

Let me know if this helps or if you have other questions.

Take care and God Bless,

Joe
Was this
answer
helpful?
Yes
No
Tuesday, February 23rd, 2021 AT 6:26 PM

Please login or register to post a reply.

Sponsored links