DTC Troubleshooting: P0718 (15-6)

DTC P0718:  Input Shaft (Mainshaft) Speed Sensor Intermittent Failure

NOTE:

1.Clear the DTC with the HDS.

2.Test-drive the vehicle for several minutes in the D position in all five gears.

3.Check the OBD status in DTC Monitor Tool from DTCs/Freeze Data in A/T Mode Menu for a pass/fail test of code P0718.

Did the result indicate a fail?


YES - Go to 4.


NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the input shaft (mainshaft) speed sensor and PCM. If the tester indicates NOT COMPLETE, return to 2 and recheck.n


4.Turn the ignition switch OFF.

5.Disconnect the input shaft (mainshaft) speed sensor connector, and inspect the connector and connector terminals to be sure they are making good contact.

Are the connector terminals OK?


YES - Go to 6.


NO - Repair the connector terminals, then go to 6.


6.Connect the input shaft (mainshaft) speed sensor connector.

7.Test-drive the vehicle for several minutes, and check the OBD status in DTC Monitor Tool from DTCs/Freeze Data in A/T Mode Menu for a pass/fail test of code P0718.

Did the result indicate a fail?


YES - Go to 8.


NO - The problem has been corrected. If the tester indicates NOT COMPLETE, return to 7 and recheck.n


8.Turn the ignition switch OFF.

9.Jump the SCS line with the HDS.

10.Disconnect PCM connector C (22P).

11.Disconnect the input shaft (mainshaft) speed sensor connector.

12.Check for continuity between input shaft (mainshaft) speed sensor connector terminal No. 2 and body ground.

 

Is there continuity?


YES - Repair short to ground in the wire between PCM connector terminal C19 and the input shaft (mainshaft) speed sensor connector, then go to 19.


NO - Go to 13.

13.Connect PCM connector C (22P).

14.Turn the ignition switch ON (II).

15.Measure the voltage between input shaft (mainshaft) speed sensor connector terminal No. 2 and body ground.

 

Is there about 5 V?


YES - Replace the input shaft (mainshaft) speed sensor, then go to 19.


NO - Go to 16.

16.Turn the ignition switch OFF.

17.Disconnect PCM connector C (22P).

18.Check for continuity between PCM connector terminal C19 and input shaft (mainshaft) speed sensor connector terminal No. 2.

 

Is there continuity?


YES - Update the PCM if it does not have the latest software, or substitute a known-good PCM, then recheck. If the symptom/indication goes away with a known-good PCM, replace the original  PCM.n


NO - Repair open in the wire between PCM connector terminal C19 and the input shaft (mainshaft) speed sensor, then go to 19.


19.Clear the DTC with the HDS.

20.Test-drive the vehicle for several minutes in the D position in all five gears.

21.Check the OBD status in DTC Monitor Tool from DTCs/Freeze Data in A/T Mode Menu for a pass/fail test of code P0718.

Did the result indicate a pass?


YES - The problem has been corrected.n


NO - Return to 1 and recheck.n