DTC P0723 (6-Speed A/T)

DTC P0723  : Output Shaft (Countershaft) Speed Sensor (Intermittent Failure)

NOTE: 

• Before you troubleshoot, review the General Troubleshooting Information - Refer to: How to Troubleshoot the A/T System .
• This code is caused by an electrical circuit problem and cannot be caused by a mechanical problem in the transmission.

DTC (A/T)

1. Problem verification

   - 1. Turn the vehicle to the ON mode.

   - 2. Clear the DTC with the HDS.

   - 3. Raise the vehicle on a lift. Make sure it is securely supported, and allow all four wheels to rotate freely.

   - 4. Start the engine.

   - 5. Disable the VSA by pressing the VSA OFF button.

   NOTE: Enter the VSA maintenance mode in case of the vehicle speed above 31 mph (50 km/h).

   - 6. Run the vehicle with the shift lever in D, and keep the vehicle at speeds over 12 mph (20 km/h). Compare the Input Shaft (Mainshaft) Speed (rpm) and the Output Shaft (Countershaft) Speed (rpm) with the HDS. Slow down, and stop the wheels.

   Signal	Current conditions
   	Values	Unit
   Input Shaft (Mainshaft) Speed (rpm)
   Output Shaft (CounterShaft) Speed (rpm)

   Are the speeds about the same?

   YES 

   Intermittent failure, the system is OK at this time. Check for poor connections and loose terminals between the output shaft (countershaft) speed sensor and the PCM. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.

   NO 

   The failure is duplicated. Go to step 2.

2. Open wire check (VCC1 line)

   - 1. Turn the vehicle to the OFF (LOCK) mode.

   - 2. Disconnect the following connector.

   Output shaft (countershaft) speed sensor 3P connector

   - 3. Turn the vehicle to the ON mode.

   - 4. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode
   	Output shaft (countershaft) speed sensor 3P connector: disconnected
   Test point 1	Output shaft (countershaft) speed sensor 3P connector No. 3
   Test point 2	Body ground

   Courtesy of HONDA, U.S.A., INC.

   Is there about 5 V?

   YES 

   The VCC1 wire is OK. Go to step 3.

   NO 

   Repair an open in the VCC1 wire between the output shaft (countershaft) speed sensor and the PCM.

3. Determine possible failure area (NC line, others)

   - 1. Measure the voltage between test points 1 and 2.

   Test condition	Vehicle ON mode
   	Output shaft (countershaft) speed sensor 3P connector: disconnected
   Test point 1	Output shaft (countershaft) speed sensor 3P connector No. 2
   Test point 2	Body ground

   Courtesy of HONDA, U.S.A., INC.

   Is there about 5 V?

   YES 

   Go to step 4.

   NO 

   Go to step 5.

4. Open wire check (SG1 line)

   - 1. Turn the vehicle to the OFF (LOCK) mode.

   - 2. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Output shaft (countershaft) speed sensor 3P connector: disconnected
   Test point 1	Output shaft (countershaft) speed sensor 3P connector No. 1
   Test point 2	Body ground

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   The SG1 wire is OK. Replace the output shaft (countershaft) speed sensor .

   NO 

   Repair an open in the SG1 wire between the output shaft (countershaft) speed sensor and the PCM.

5. Shorted wire check (NC line)

   - 1. Turn the vehicle to the OFF (LOCK) mode.

   - 2. Jump the SCS line with the HDS, and wait more than 1 minute.

   - 3. Disconnect the following connector.

   PCM connector C (51P)

   - 4. Check for continuity between test points 1 and 2.

   Test condition	Vehicle OFF (LOCK) mode
   	Output shaft (countershaft) speed sensor 3P connector: disconnected
   	PCM connector C (51P): disconnected
   Test point 1	Output shaft (countershaft) speed sensor 3P connector No. 2
   Test point 2	Body ground

   Courtesy of HONDA, U.S.A., INC.

   Is there continuity?

   YES 

   Repair a short to ground in the NC wire between the output shaft (countershaft) speed sensor and the PCM.

   NO 

   The NC wire is not shorted. Repair an open in the NC wire between the output shaft (countershaft) speed sensor and the PCM.