Inspection Procedure

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. PERFORM ACTIVE TEST 
   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 on the Techstream.
   6. Select the item "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.

   Comparing the shift position commanded by the Active Test with the actual shift position enables you to confirm the problem (See FAIL-SAFE CHART ).

   TESTER DISPLAY CHART
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Control the Shift Position	[Test Details] Operate the shift solenoid valve and set the each shift position by yourself. [Vehicle Condition] IDL: ON Less than 50 km/h (31 mph) [Others] Press "→" button: Shift up Press "←" button: Shift down	1st/2nd/3rd/4th	Possible to check the operation of the shift solenoid valves.

   HINT:

   • This test can be conducted when the vehicle speed is 50 km/h (31 mph) or less.
   • The shift position commanded by the ECM is shown in the Data List/Shift Status display on the Techstream.

1. CHECK OTHER DTCS OUTPUT (IN ADDITION TO DTC P0751) 
   1. Connect the Techstream to the DLC3.
   2. Turn the ignition switch to ON and the Techstream main switch on.
   3. Select the item "Powertrain / Engine and ECT / Trouble Codes".
   4. Read the DTCs using the Techstream.

   Result 

   RESULT CHART
   
   

   Result	Proceed to
   P0751	A
   P0751 and other DTCs	B

   HINT:

   If any other codes besides "P0751" are output, perform the troubleshooting for those DTCs first.

   B: Go to DTC CHART  (See DIAGNOSTIC TROUBLE CODE CHART )

   A: Go to next step 

2. INSPECT SHIFT SOLENOID VALVE S1 
   1. Remove the shift solenoid valve S1.
   2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection	Condition	Specified Condition
      Solenoid Connector (S1) - Solenoid Body (S1)	20°C (68°F)	11 to 15 Ω

   3. Connect the positive (+) lead to the terminal of the solenoid connector, and the negative (-) lead to the solenoid body.

      OK: 

      The solenoid makes an operating sound. 

      NG: REPLACE SHIFT SOLENOID VALVE S1  (See DISASSEMBLY )

      Fig 1: Inspecting Shift Solenoid Valve S1

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK: Go to next step 

3. INSPECT TRANSMISSION VALVE BODY ASSEMBLY 

   OK: 

   There are no foreign objects on each valve and they operate smoothly. 

   NG: REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY  (See REMOVAL )

   OK: REPAIR OR REPLACE AUTOMATIC TRANSAXLE ASSEMBLY  (See REMOVAL )