Inspection Procedure

If a DTC is output for the skid control ECU, first troubleshoot it.

HINT:

• When using the intelligent tester start from  1. When not using the intelligent tester, start from  2.
• Before troubleshooting for this DTC, make sure no skid control ECU DTCs are present.

1. READ VALUE OF INTELLIGENT TESTER (HEIGHT CONTROL SENSOR) 
   1. Connect the intelligent tester to the DLC3.
   2. Start the engine and push the intelligent tester main switch ON.
   3. Select the DATA LIST mode on the intelligent tester.
   4. Check that the vehicle height value of the height control sensor displayed by the intelligent tester is changing when pushing the UP or DOWN button of the height select switch.

      OK: 

      Vehicle height value must be changing. 

   NG: Go to step   3 

   OK: REPLACE SUSPENSION CONTROL ECU 

2. CHECK SUSPENSION CONTROL ECU 
   1. Remove the suspension control ECU with connectors still connected.
   2. Turn the ignition switch ON.
   3. Measure the voltage between terminals SHB and SHG of the suspension control ECU connector.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION
      
      

      Tester Connection	Specified Condition
      S21-1 (SHB) - S21-9 (SHG)	Approximately 5 V

   NG: Go to step   4 

   Fig 1: Measuring Voltage Between Terminals SHB & SHG Of Suspension Control ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: GO TO NEXT STEP 

3. CHECK HEIGHT CONTROL SENSOR (RIGHT FRONT, LEFT FRONT AND REAR) 
   1. Disconnect the height control sensor connector.
   2. Remove the height control sensor.
   3. Connect 3 dry batteries of 1.5 V in series.
   4. Connect terminal 2 to the batteries' positive (+) terminal, and terminal 3 to the batteries' negative (-) terminal, then apply voltage about 4.5 V between terminals 2 and 3.
   5. Measure the voltage between terminals 1 and 3 when the height control sensor link is slowly moved up and down.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION
      
      

      Tester Connection	Sensor Link Position	Specified Condition
      1 - 3	Max. HI	Approximately 4.05 V
      1 - 3	N	Approximately 2.25 V
      1 - 3	Min. LO	Approximately 0.45 V

   6. Disconnect the height control sensor connector.
   7. Remove the height control sensor.
   8. Connect 3 dry batteries of 1.5 V in series.
   9. Connect terminal 1 to the batteries' positive (+) terminal, and terminal 3 to the batteries' negative (-) terminal, then apply voltage about 4.5 V between terminals 1 and 3.
   10. Measure the voltage between terminals 2 and 3 when the height control sensor link is slowly moved up and down.

       Standard voltage 

       TESTER CONNECTION SPECIFIED CONDITION
       
       

       Tester Connection	Sensor Link Position	Specified Condition
       2 - 3	Max. HI	Approximately 4.05 V
       2 - 3	N	Approximately 2.25 V
       2 - 3	Min. LO	Approximately 0.45 V

   NG: REPLACE HEIGHT CONTROL SENSOR (RIGHT FRONT, LEFT FRONT AND REAR) 

   Fig 2: Disconnecting Height Control Sensor Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: GO TO NEXT STEP 

4. CHECK WIRE HARNESS (HEIGHT CONTROL SENSOR (RIGHT FRONT, LEFT FRONT AND REAR) - SUSPENSION CONTROL ECU) 

   NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

   OK: REPLACE SUSPENSION CONTROL ECU