DTC P0729: Gear 6 Incorrect Ratio [08/2017 - 08/2019]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.
5. Read the DTCs using the Techstream.
   RESULT
   
   

   Result	Proceed to
   Only P0729 is output	A
   P0729 and other DTCs are output	B

   HINT: 

   If any other codes besides P0729 are output, perform troubleshooting for those DTCs first.

Result: 

B 

GO TO DTC CHART 

Refer to:DIAGNOSTIC TROUBLE CODE CHART [08/2017 - 08/2019] )

Result: 

A 

See step  2

HINT: 

Using the Techstream to perform Active Tests allows relays, VSVs, actuators and other items to be operated without removing any parts. This non-intrusive functional inspection can be very useful because intermittent operation may be discovered before parts or wiring is disturbed. Performing Active Tests early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while performing Active Tests.

1. Warm up the engine.
2. Turn the ignition switch off.
3. Connect the Techstream to the DLC3.
4. Turn the ignition switch to ON.
5. Turn the Techstream on.
6. Enter the following menus: Powertrain / Engine and ECT / Active Test.
7. According to the display on the Techstream, perform the Active Test.

   HINT: 

   While driving, the shift position can be forcibly changed with the Techstream.

   ENGINE AND ECT
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Control the Shift Position	Operate shift solenoid valve and set each shift position by yourself	Press "→" button: Shift up Press "←" button: Shift down	Possible to check operation of shift solenoid valves [Vehicle Condition] 50 km/h (30 mph) or less

   HINT: 

   • This test can be conducted when the vehicle speed is 50 km/h (30 mph) or less.
   • The 4th to 5th and 5th to 6th up-shift must be performed with the accelerator pedal released.
   • The 6th to 5th and 5th to 4th down-shift must be performed with the accelerator pedal released.
   • Do not operate the accelerator pedal for at least 2 seconds after shifting and do not shift successively.
   • The shift position commanded by the ECM is shown in the Data List display on the Techstream.
   • Gear positions in the event of a solenoid valve mechanical problem:

     Tester command gearshift	1st	2nd	3rd	4th	5th	6th
     Actual gear position under malfunction	1st	2nd	3rd	4th	5th	4th

   OK

   Gear position changes in accordance with the tester command.

Result: 

NG 

REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY 

Refer to:REMOVAL [08/2015 - ]

Result: 

OK 

See step  3

HINT: 

Using the Techstream to perform Active Tests allows relays, VSVs, actuators and other items to be operated without removing any parts. This non-intrusive functional inspection can be very useful because intermittent operation may be discovered before parts or wiring is disturbed. Performing Active Tests early in troubleshooting is one way to save diagnostic time. Data List information can be displayed while performing Active Tests.

1. Remove the test plug on the transmission case center right side and connect SST.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   • SST: 09993-19015 
     1. 09993-00010
     2. 09993-00040
2. Connect the Techstream to the DLC3.
3. Start the engine and warm it up.
4. Measure the line pressure with SST.
5. Turn the Techstream on.
6. Enter the following menus: Powertrain / Engine and ECT / Active Test.
7. According to the display on the Techstream, perform the Active Test.
8. Measure the line pressure.
   ENGINE AND ECT
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Activate the Solenoid (SLT)*	Operate the shift solenoid SLT and raise line pressure	ON or OFF HINT:  OFF: Line pressure up (when Active Test "Activate the Solenoid (SLT)" is performed, ECM commands SLT solenoid to turn OFF) ON: No action (normal operation)	[Vehicle Condition] Vehicle stopped Engine idling

   HINT: 

   *: Activate the Solenoid (SLT) in the Active Test is performed to check the line pressure changes by connecting SST to the automatic transmission, which is used in the Hydraulic Test. Refer to: HYDRAULIC TEST [08/2015 - 08/2019] ) as well. Please note that the pressure values in the Active Test and Hydraulic Test are different.

   OK

   The line pressure changes as specified when performing the Active Test.

Result: 

NG 

REPLACE SHIFT SOLENOID VALVE SLT 

Refer to:PROCEDURE - Step 3 )

Result: 

OK 

See step  4

1. Clear the DTC. Refer to: DTC CHECK / CLEAR [08/2015 - 08/2019]
2. Check the DTC again after conducting the Monitor Drive Pattern. Refer to: MONITOR DRIVE PATTERN [08/2015 - ]

   OK

   No DTC code output.

Result: 

OK 

END 

Result: 

NG 

REPAIR OR REPLACE AUTOMATIC TRANSMISSION ASSEMBLY 

Refer to:REMOVAL [08/2015 - ]