Repair Instruction: Initialization

Procedures Necessary when Cable is Disconnected/Reconnected to Battery Terminal 

Procedures Necessary when ECU or Other Parts are Replaced 

HINT:

The VIN is in the form of a 17-digit alphanumeric vehicle identification number. The Techstream is required to register the VIN.

1. DESCRIPTION

   HINT:

   This registration section consists of two parts: Read VIN and Write VIN.

   1. Read VIN: Explains the VIN reading process in a flowchart. This process allows the VIN stored in the ECM to be read in order to confirm that the two VINs, provided with the vehicle and stored in the vehicle ECM, are the same.
   2. Write VIN: Explains the VIN writing process in a flowchart. This process allows the VIN to be input into the ECM. If the ECM is changed, or the ECM VIN and vehicle VIN do not match, the VIN can be registered, or overwritten in the ECM by following this procedure.
2. READ VIN
   1. Confirm the vehicle VIN.
   2. Connect the Techstream to the DLC3.
   3. Turn the engine switch on (IG).
   4. Turn the Techstream on.
   5. Enter the following menus: Powertrain / Engine and ECT / Utility / VIN / VIN Read.
3. WRITE VIN
   1. Confirm the vehicle VIN.
   2. Connect the Techstream to the DLC3.
   3. Turn the engine switch on (IG).
   4. Turn the Techstream on.
   5. Enter the following menus: Powertrain / Engine and ECT / Utility / VIN / VIN Write.

1. INITIALIZE DISTANCE CONTROL ECU
   1. Turn the engine switch on (IG).
   2. Turn the cruise control main switch on.
   3. Depress the brake pedal (brake switch on).
   4. With the brake pedal depressed, push the cruise control main switch to +RES 3 times within 3 seconds, and check that the buzzer sounds.
      NOTE: At this time, do not turn the headlight dimmer switch on. Due to the activation of the beam axis automatic adjustment mode, turning the headlight dimmer switch on may result in an incorrect setting. If the headlight dimmer switch is turned on by mistake, perform the beam axis adjustment again.

1. RESET MEMORY
   NOTE:

   • Perform the Reset Memory (AT initialization) when replacing the automatic transmission assembly, valve body assembly or any of the shift solenoid valves.
   • The Reset Memory can only be performed with the Techstream.

   HINT:

   The ECM memorizes the control conditions of the automatic transmission assembly and engine assembly. Therefore, when the automatic transmission assembly, valve body assembly or any of the shift solenoid valves has been replaced, it is necessary to reset the memory so that the ECM can memorize the new information.

   1. Connect the Techstream to the DLC3.
   2. Turn the engine switch on (IG).
   3. Turn the Techstream on.
   4. Enter the following menus: Powertrain / Engine and ECT / Utility / Reset Memory.
      NOTE: After performing the Reset Memory, be sure to perform the Road Test described earlier.

      HINT:

      The ECM learns through the Road Test.

1. DESCRIPTION
   1. If replacing the suspension control ECU and/or height control sensor, perform the vehicle height offset calibration.
2. VEHICLE HEIGHT OFFSET CALIBRATION
   NOTE:

   • Make sure that the pressure of the tires is normal.
   • Make sure that the vehicle is empty.
   • Make sure that the parking brake is released and that the shift lever is in N.
   • Make sure that the easy access mode switch is off.
   1. PERFORM VEHICLE HEIGHT INSPECTION
      1. Adjust the pressure of the tires.
      2. Stabilize the suspension by releasing the parking brake and bouncing the corners of the vehicle up and down.
      3. Start the engine.
      4. Perform the following operation twice:

         Set the vehicle height to LO with the height control switch, and then return the vehicle height to NORMAL.

      5. Turn the engine switch off.
      6. Connect the Techstream to the DLC3.
      7. Move the shift lever to N and move the vehicle forward and rearward.
      8. Turn the engine switch on (IG) and the Techstream on.

         HINT:

         Make sure the engine is not running.

      9. Check that the vehicle height is NORMAL.

         HINT:

         The N of the multi-information display height control indicator in the combination meter turns on.

      10. Perform the vehicle height inspection.

          Measuring points: 

          A: 

          Ground clearance of front wheel center 

          B: 

          Ground clearance of the front adjusting cam bolt center 

          C: 

          Ground clearance of the rear axle shaft center 

          D: 

          Ground clearance of the rear lower control arm front side center 

          Fig 1: Identifying Ground Clearance Of Front Wheel Center And Rear Axle Shaft Center

          Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

          Standard Vehicle Height 

          VEHICLE HEIGHT SPECIFICATION
          
          

          Front (A minus B)	Rear (C minus D)
          101 mm (3.98 in.)	94 mm (3.70 in.)

      11. Using a jack, set the vehicle to the standard vehicle height and eliminate any difference in height between the left and right sides of the vehicle.
          NOTE: The vehicle height may be outside the calibration range if there is a difference in height between the left and right sides of the vehicle.
      12. Using the Techstream, enter the following menus: Chassis / AHC / Data List. Then read and record the values for "After Height Adjust" and "Height Adjust" for each wheel.

          AHC 

          DATA LIST
          
          

          Tester Display	Measurement Item/Range	Normal Condition	Diagnosis Note
          FR Height Adjust	Display of vehicle height offset recorded value of front right wheel / min.: -3276.8 mm (-129 in.) max.: 3276.7 mm (129 in.)	-	-
          FL Height Adjust	Display of vehicle height offset recorded value of front left wheel / min.:-3276.8 mm (-129 in.) max.: 3276.7 mm (129 in.)	-	-
          RR Height Adjust	Display of vehicle height offset recorded value of rear right wheel / min.:-3276.8 mm (-129 in.) max : 3276.7 mm (129 in.)	-	-
          RL Height Adjust	Display of vehicle height offset recorded value of rear left wheel / min.: -3276.8 mm (-129 in.) max.: 3276.7 mm (129 in.)	-	-
          FR After Height Adjust	Display of after-calibration vehicle height value of front right wheel / min.: -3276.8 mm (-129 in.) max.: 3276.7 mm (129 in)	-	-
          FL After Height Adjust	Display of after-calibration vehicle height value of front left wheel / min.: -3276.8 mm (-129 in.) max.: 3276.7 mm (129 in.)	-	-
          RR After Height Adjust	Display of after-calibration vehicle height value of rear right wheel / min..-3276.8 mm (-129 in.) max.: 3276 7 mm (129 in.)	-	-
          RL After Height Adjust	Display of after-calibration vehicle height value of rear left wheel / min.:-3276 8 mm (-129 in.) max.- 3276.7 mm (129 in.)	-	-

      13. Turn the engine switch off.
   2. PERFORM VEHICLE HEIGHT OFFSET CALIBRATION
      NOTE: The possible vehicle height automatic adjustment value is 20 mm (0.787 in.). If the "Height Adjust value + (Standard value - Measurement value - After Height Adjust value)" is 20 mm (0.787 in.) or more, first perform the vehicle height adjustment for the front side, and for the rear side.
      1. Turn the engine switch off.
      2. Connect the Techstream to the DLC3.
      3. Turn the engine switch on (IG) and the Techstream on.
      4. Enter the following menus: Chassis / AHC / Utility / Height offset.
      5. For each wheel, follow the instructions on the Techstream screen and input the input value to complete the vehicle height offset calibration.

         HINT:

         Input value = Measurement value and standard value

      6. Remove the jack.
      7. Start the engine.
      8. Set the vehicle height to LO and check that LO of the multi-information display height control indicator stops blinking and illuminates.
      9. Set the vehicle height to NORMAL and check that N of the height control indicator stops blinking and illuminates.
      10. Turn the engine switch off.
      11. Perform the vehicle height inspection. Check that the result is within +/-8 mm (+/-0.315 in.) of the standard value.
      12. Perform yaw rate and G sensor zero point calibration.

1. DESCRIPTION OF CODE REGISTRATION

   It is necessary to register the transmitter ID in the tire pressure warning ECU when replacing a tire pressure warning valve and transmitter and/or the tire pressure warning ECU:

   Prepare all transmitter ID data before starting registration.

   1. Before registration
      1. In case of tire pressure warning ECU replacement:
         • Read the registered transmitter IDs that are stored in the old ECU using the Techstream and note them down.
         • If reading the stored transmitter IDs is impossible due to malfunctions of components such as the tire pressure warning antenna and receiver, remove the tires from the wheels and check the IDs located on the tire pressure warning valve and transmitters.
      2. In case of tire pressure warning valve and transmitter replacement:
         • Take a note of the 7 digit number (transmitter ID) written on the tire pressure warning valve and transmitter.
           Fig 2: Identifying Transmitter ID

           Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002