DTC P0717: Input Shaft (Mainshaft) Speed Sensor (No Signal Input); DTC P0718: Input Shaft (Mainshaft) Speed Sensor (Intermittent Failure)

WARNING: This page is about a different car, the 2013 Honda Odyssey, 2012 Honda Odyssey, and 2011 Honda Odyssey. However, it is still accessible from the selected car via links, so may be relevant.

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.

Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Block the rear wheels, and 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.
Start the engine, disable the VSA by pressing the VSA OFF button, run the vehicle with the shift lever in D, and at speeds over 12 mph (20 km/h) for at least 10 seconds. Compare the Input Shaft (Mainshaft) Speed and the Output Shaft (Countershaft) Speed in the A/T Data List with the HDS. Slow down, and stop the wheels.
Are the speeds about the same?

YES -Intermittent failure, the system is OK at this time.

NO -Go to step 5.
Turn the ignition switch to LOCK (0).
Disconnect the input shaft (mainshaft) speed sensor connector.
Turn the ignition switch to ON (II).
Measure the voltage between input shaft (mainshaft) speed sensor connector terminal No. 3 and body ground.

Fig 1: Measuring Voltage Between Input Shaft (Mainshaft) Speed Sensor Connector Terminal No. 3 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there about 5 V?

YES -Go to step 9.

NO -Repair an open in the wire between PCM connector terminal C12 and the input shaft (mainshaft) speed sensor, then go to step 16.
Measure the voltage between input shaft (mainshaft) speed sensor connector terminal No. 2 and body ground.

Fig 2: Measuring Voltage Between Input Shaft (Mainshaft) Speed Sensor Connector Terminal No. 2 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there about 5 V?

YES -Go to step 10.

NO -Go to step 12.
Turn the ignition switch to LOCK (0).
Check for continuity between input shaft (mainshaft) speed sensor connector terminal No. 1 and body ground.

Fig 3: Checking Continuity Between Input Shaft (Mainshaft) Speed Sensor Connector Terminal No. 1 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Replace the input shaft (mainshaft) speed sensor (see INPUT SHAFT (MAINSHAFT) SPEED SENSOR REPLACEMENT ), then go to step 19.

NO -Repair an open in the wire between the input shaft (mainshaft) speed sensor connector and the PCM connector terminal C16, then go to step 16.
Turn the ignition switch to LOCK (0).
Jump the SCS line with the HDS.
Disconnect PCM connector B (49P).
Check for continuity between input shaft (mainshaft) speed sensor connector terminal No. 2 and body ground.

Fig 4: Checking Continuity Between Input Shaft (Mainshaft) Speed Sensor Connector Terminal No. 2 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Repair a short to body ground in the wire between PCM connector terminal B37 and the input shaft (mainshaft) speed sensor connector, then go to step 16.

NO -Repair an open in the wire between PCM connector terminal B37 and the input shaft (mainshaft) speed sensor, then go to step 16.
Reconnect all connectors.
Turn the ignition switch to ON (II).
Clear the DTC with the HDS.
Start the engine, disable the VSA by pressing the VSA OFF button, run the vehicle with the shift lever in D, and at speeds over 12 mph (20 km/h) for at least 10 seconds. Compare the Input Shaft (Mainshaft) Speed and the Output Shaft (Countershaft) Speed in the A/T Data List with the HDS. Slow down, and stop the wheels.
Are the speeds about the same?

YES -Troubleshooting is complete.

NO -Replace the PCM (see PCM REPLACEMENT ).