Inspection Procedure: Procedure

1. Enter the "Vehicle Sensors" screen. Refer to Check Navigation Check in Operation Check. Refer to OPERATION CHECK .
2. While driving the vehicle, compare the "Speed" indicator to the reading on the speedometer. Check if these readings are almost equal.
   Fig 1: Checking Vehicle Sensor (Operation Check)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK

   The readings are almost equal.

NG → See step   2 

OK → See step   9 

1. Check the output waveform.
   Fig 2: Inspecting Combination Meter Assembly (No. 3 Meter Circuit Plate Output Waveform)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Remove the combination meter assembly with the connector(s) still connected.
   2. Connect an oscilloscope to terminal L27-7 (+S) and body ground.
   3. Turn the power switch on (IG).
   4. Turn a wheel slowly.
   5. Check the signal waveform according to the condition(s) in the table below.

      Item	Condition
      Measurement terminal	L27-7 (+S) - Body ground
      Tool setting	5 V/DIV., 20 ms./DIV.
      Vehicle condition	Wheel being rotated

      OK

      The waveform is similar to that shown in the illustration.

      HINT: 

      When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows.

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Combination Meter Assembly)

NG → See step   10 

OK: Go to next step 

1. Disconnect the L42 navigation receiver assembly connector.
2. Disconnect the L27 combination meter assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   L42-3 (SPD) - L27-7 (+S)	Always	Below 1 Ω

NG → See step   4 

OK → See step   9 

1. Disconnect the L42 navigation receiver assembly connector.
2. Disconnect the 4A No. 4 junction block connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   L42-3 (SPD) - 4A-68	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the 4A No. 4 junction block connector.
2. Disconnect the 3B No. 3 junction block connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   4A-21 - 3B-85	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the 3A No. 3 junction block connector.
2. Disconnect the L27 combination meter assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3A-26 - L27-7 (+S)	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Measure the resistance according to the value(s) in the table below.
   Fig 3: Inspecting No. 4 Junction Block

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   4A-68 - 4A-21	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Component without harness connected (No. 4 Junction Block)

NG → REPLACE NO. 4 JUNCTION BLOCK 

OK: Go to next step 

1. Measure the resistance according to the value(s) in the table below.
   Fig 4: Inspecting No. 3 Junction Block

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   3A-26 - 3B-85	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *a	Component without harness connected (No. 3 Junction Block)

NG → REPLACE NO. 3 JUNCTION BLOCK 

OK → See step   9