Code No.P1767 (P0720): Output shaft speed sensor system
OPERATION
The output shaft speed sensor detects the speed of the direct planetary carrier, and sends the information to the ECU as a pulse signal.
DIAGNOSIS CODE SET CONDITIONS
If the output pulse from the output shaft speed sensor has been lost for one second or more while the vehicle is being driven, it is judged that there is an open circuit or short circuit in the output shaft speed sensor, and diagnosis code No.P1767 (P0720) is set. If the code No.P1767 (P0720) is set four times, the transmission will be fixed in 3rd gear as a fail-safe measure. However, the transmission can be downshifted to 2nd gear by operating the selector lever.
PROBABLE CAUSES
Malfunction of output shaft speed sensor
Malfunction of output shaft <4A/T>
Malfunction of direct planetary carrier <5A/T>
Damaged harness wires and connectors
Malfunction of the A/T-ECU <4M4>
Malfunction of the engine-A/T-ECU <6G7>
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
Item 6: Output shaft speed sensor (Refer to data list reference table ).
Q.
Is the check result normal?
Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).
(3)Measure the voltage between A/T-ECU connector D-38 terminal No.43 <4M4> and earth or engine-A/T-ECU connector D-216 terminal No.88 <6G7>. OK: 0.5 V or less
(3)Measure the voltage between A/T-ECU connector D-38 terminal No.32 <4M4> and earth or engine-A/T-ECU connector D-216 terminal No.73 <6G7> and earth. OK: 4.5 - 4.9 V
STEP 17. Check the harness between output shaft speed sensor connector C-07 terminal No.2 and A/T-ECU connector D-38 terminal No.32 <4M4> or engine-A/T-ECU connector D-216 terminal No.73 <6G7>.
Check the output line for open circuit.
Q.
Is the check result normal?
Go to Step 6.
Repair the wiring harness.
STEP 18. Measure the output wave pattern of the output shaft speed sensor at A/T-ECU connector D-38 <4M4> or engine-A/T-ECU connector D-216 <6G7> (using an oscilloscope).
(1)Shift the selector lever to the D range.
(2)Accelerate the vehicle to approximately 50 km/h (shift range; 3rd.)
(3)Connect an oscilloscope, and measure the voltage between A/T-ECU connector D-38 terminal No.32 <4M4> and earth or engine-A/T-ECU connector D-216 terminal No.73 <6G7> and earth. OK: A wave pattern such as the one shown on (Check Procedure Using an Oscilloscope) should be output, and the maximum value should be 4.8 V or more and the minimum value should be 0.8 V or less. There should be no noise in the output wave pattern.
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Intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction 
Go to Step 2.