DTC P0721-31 / P0721-61 / P0721-81 / P0721-83 / P0721-85 / P0721-86 / P0721-87

Precautions: Precautions for Diagnosing Trouble · Precautions for Disassembly and Reassembly · Precautions for Transmission / Transaxle · General safety (00)

DTC Detecting Condition and Trouble Area

DTC detecting condition	Trouble area
P0721-31: Output Speed Sensor Circuit Range / Performance – No Signal Vehicle speed signal is not inputted although the following conditions are satisfied: •Vehicle speed is greater than a specified value. •Even gear is engaged. (1 D/C detection logic but transmission warning light does not light up)	•CAN communication line •Wheel speed sensor and/or its circuit •ESP^® control module •TCM
P0721-61: Output Speed Sensor Circuit Range / Performance – Signal Calculation Failure This DTC is detected if the following conditions are met. •Absolute value (vehicle speed – (deducts) vehicle speed calculated by even clutch speed) is higher than specified value. •Absolute value (vehicle speed – (deducts) vehicle speed calculated by engine speed) is higher than specified value. (1 D/C detection logic but transmission warning light does not light up)
P0721-81: Output Speed Sensor Circuit Range / Performance – Invalid Serial Data Received Invalid vehicle speed (output speed) signal is received from ESP^® control module via CAN. (1 D/C detection logic but transmission warning light does not light up)
P0721-83: Output Speed Sensor Circuit Range / Performance – Value of Signal Protection Calculation Incorrect This DTC is detected if the following conditions are met. •Absolute value (vehicle speed – (deducts) vehicle speed calculated by odd clutch speed) is higher than specified value. •Absolute value (vehicle speed – (deducts) vehicle speed calculated by engine speed) is higher than specified value. (1 D/C detection logic but transmission warning light does not light up)
P0721-85: Output Speed Sensor Circuit Range / Performance – Signal Above Allowable Range Vehicle speed signal is not inputted although the following conditions are satisfied: •During gear change. •Actual gear is 2nd, 4th or 6th. •Even gear clutch speed is greater than a specified value. (1 D/C detection logic but transmission warning light does not light up)
P0721-86: Output Speed Sensor Circuit Range / Performance – Signal Invalid Vehicle speed signal is not inputted although the following conditions are satisfied: •Vehicle speed is greater than a specified value. •Odd gear is engaged. (1 D/C detection logic but transmission warning light does not light up)
P0721-87: Output Speed Sensor Circuit Range / Performance – Missing Message Vehicle speed signal is not inputted although the following conditions are satisfied: •During gear change. •Actual gear is 3rd or 5th. •Odd gear clutch speed is greater than a specified value. (1 D/C detection logic but transmission warning light does not light up)	•CAN communication line •Wheel speed sensor and/or its circuit •ESP^® control module •TCM

DTC Confirmation Procedure

WARNING:

If you do not select a suitable route and take proper precautions when performing a road test, an accident can occur.

•Select a level road with no traffic to minimize the risk of accident.
•Perform the test extremely carefully.
•Perform the road test with 2 persons, a driver and a tester.

NOTE:

•Check that the following condition is satisfied in this procedure.

—11 V < Battery voltage < 15 V

•Check that the following DTC is not detected in this “DTC Confirmation Procedure.”

—CAN communication (U0121-87)

1)Start engine and drive vehicle.

DTC Troubleshooting

Step	Action	Yes	No
1	Was “Twin Clutch System Check” performed?	Go to Step 2.	Go to Twin Clutch System Check.
2	DTC check Is there any CAN-DTC detected?	Go to troubleshooting for CAN-DTC.	Go to Step 3.
3	DTC check 1)Check ESP^® control module for DTC. Is there any DTC(s) detected?	Go to troubleshooting for applicable DTC.	Replace TCM and recheck DTC.