METER / GAUGE SYSTEM Speed Signal Circuit

DESCRIPTION

The vehicle speed signal consists of pulses sent to the combination meter assembly from the skid control ECU.

INSPECTION PROCEDURE

PROCEDURE

1. Click here

   CHECK ECU TERMINAL VOLTAGE (INPUT VOLTAGE)

   
   
   1. 

      Disconnect the combination meter assembly connector.

   2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition H62-3 (+S) - Body ground Ignition switch ON 4.5 to 14 V

      Table 1. Text in Illustration

      *a	Front view of wire harness connector (to Combination Meter Assembly)

   
   
   • OKClick here
   • NGClick here
2. Click here

   CHECK COMBINATION METER ASSEMBLY (OUTPUT VOLTAGE)

   
   

   1. Disconnect the brake actuator assembly (skid control ECU) connector.

      
      

      • *1: for AD Series Engine, 1WW Engine

      • *2: for ZR Series Engine

   2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Table 2. for AD Series Engine, 1WW Engine Tester Connection Switch Condition Specified Condition A52-33 (SP1) - Body ground Ignition switch ON 11 to 14 V
      Table 3. for ZR Series Engine Tester Connection Switch Condition Specified Condition A54-33 (SP1) - Body ground Ignition switch ON 11 to 14 V

      Table 4. Text in Illustration

      *A	for AD Series Engine, 1WW Engine
      *B	for ZR Series Engine
      *a	Front view of wire harness connector (to Brake Actuator Assembly [Skid Control ECU])
      *b	Front view of wire harness connector (to Brake Actuator Assembly [Skid Control ECU])

   
   
   • OKClick here
   • NGClick here
3. Click here

   CHECK COMBINATION METER ASSEMBLY (SPEED SIGNAL)

   
   
   1. 

      Check the input waveform.

      
      

      1. Reconnect the H62 combination meter assembly connector.

      2. Remove the combination meter assembly with the connector(s) still connected.

      3. Connect an oscilloscope to terminal H62-5 (SI) and body ground.

      4. Turn the ignition switch to ON.

      5. Check the signal waveform according to the condition(s) in the table below.

         Table 5. Measurement Condition

         Item	Condition
         Terminal No. (Symbol)	H62-5 (SI) - Body ground
         Tool setting	5 V/DIV., 20 ms./DIV.
         Condition	Being driven at approximately 20 km/h (12 mph)

         OK
         The waveform displayed is as shown in the illustration.

         Table 6. Text in Illustration

         *a	Component with harness connected (Combination Meter Assembly)

         Tip:

         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.

   
   
   • OKClick here
   • NGClick here
4. Click here

   CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - BRAKE ACTUATOR ASSEMBLY)

   
   

   1. Disconnect the combination meter assembly connector.

   2. Disconnect the brake actuator assembly (skid control ECU) connector.

      
      

      • *1: for AD Series Engine, 1WW Engine

      • *2: for ZR Series Engine

   3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Table 7. for AD Series Engine, 1WW Engine Tester Connection Condition Specified Condition H62-5 (SI) - A52-33 (SP1) Always Below 1 Ω A52-33 (SP1) - Body ground Always 10 kΩ or higher
      Table 8. for ZR Series Engine Tester Connection Condition Specified Condition H62-5 (SI) - A54-33 (SP1) Always Below 1 Ω A54-33 (SP1) - Body ground Always 10 kΩ or higher

      Table 9. Text in Illustration

      *A	for AD Series Engine, 1WW Engine
      *B	for ZR Series Engine
      *a	Front view of wire harness connector (to Combination Meter Assembly)
      *b	Front view of wire harness connector (to Brake Actuator Assembly [Skid Control ECU])
      *c	Front view of wire harness connector (to Brake Actuator Assembly [Skid Control ECU])

   
   
   • OKClick here
   • NGClick here
5. Click here

   CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - NO. 3 JUNCTION BLOCK)

   
   
   1. 

      Disconnect the combination meter assembly connector.

      Table 10. Text in Illustration

      *a

      Front view of wire harness connector (to No. 3 Junction Block)

      *b

      Front view of wire harness connector (to Combination Meter Assembly)

   2. Disconnect the 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 H62-3 (+S) - 3A-55 Always Below 1 Ω H62-3 (+S) - Body ground Always 10 kΩ or higher

      Table 11. Result

      Result	Proceed to
      OK (w/ Entry and start system, TOYOTA parking assist-sensor system or tire pressure warning system)	A
      OK (w/o Entry and start system, TOYOTA parking assist-sensor system and tire pressure warning system)	B
      NG	C

   
   
   • AClick here
   • BClick here
   • CClick here
6. Click here

   CHECK POWER MANAGEMENT CONTROL ECU

   
   
   1. 

      Disconnect the No. 3 junction block connector.

      Table 12. Text in Illustration

      *a

      Front view of wire harness connector (to No. 3 Junction Block)

      -

      -

   2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition 3B-67 - Body ground Ignition switch ON 4.5 to 14 V

   
   
   • OKClick here
   • NGClick here
7. Click here

   CHECK RADIO RECEIVER ASSEMBLY

   Note:

   For vehicles radio and display type, go to "Check Radio and Display Receiver Assembly".

   
   
   1. 

      Disconnect the No. 3 junction block connector.

      Table 13. Text in Illustration

      *a

      Front view of wire harness connector (to No. 3 Junction Block)

      -

      -

   2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition 3A-43 - Body ground Ignition switch ON 4.5 to 14 V

   
   
   • OKClick here
   • NGClick here
8. Click here

   CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY

   Note:

   For vehicles radio receiver type, go to "Check Headlight Leveling ECU Assembly".

   
   
   1. 

      Disconnect the No. 3 junction block connector.

      Table 14. Text in Illustration

      *a

      Front view of wire harness connector (to No. 3 Junction Block)

      -

      -

   2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition 3A-43 - Body ground Ignition switch ON 4.5 to 14 V

   
   
   • OKClick here
   • NGClick here
9. Click here

   CHECK HEADLIGHT LEVELING ECU ASSEMBLY

   Note:

   For vehicles without an HID headlight system, go to "Check TCM".

   
   
   1. 

      Disconnect the No. 3 junction block connector.

      Table 15. Text in Illustration

      *a

      Front view of wire harness connector (to No. 3 Junction Block)

      -

      -

   2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition 3A-19 - Body ground Ignition switch ON 4.5 to 14 V

   
   
   • OKClick here
   • NGClick here
10. Click here

    CHECK TCM

    Note:

    For vehicles with a manual transaxle or CVT, go to "Check ECM".

    
    
    1. 

       Disconnect the No. 3 junction block connector.

       Table 16. Text in Illustration

       *a

       Front view of wire harness connector (to No. 3 Junction Block)

       -

       -

    2. Measure the voltage according to the value(s) in the table below.

       Standard Voltage
       Tester Connection Switch Condition Specified Condition 3A-54 - Body ground Ignition switch ON 4.5 to 14 V

    
    
    • OKClick here
    • NGClick here
11. Click here

    CHECK ECM

    
    
    1. 

       Disconnect the No. 3 junction block connector.

       Table 17. Text in Illustration

       *a

       Front view of wire harness connector (to No. 3 Junction Block)

       -

       -

    2. Measure the voltage according to the value(s) in the table below.

       Standard Voltage
       Tester Connection Switch Condition Specified Condition 3A-20 - Body ground Ignition switch ON 4.5 to 14 V

    
    
    • OKClick here
    • NGClick here
12. Click here

    CHECK HARNESS AND CONNECTOR (NO. 3 JUNCTION BLOCK - NO. 4 JUNCTION BLOCK)

    
    
    1. 

       Disconnect the No. 3 junction block connector.

       Table 18. Text in Illustration

       *a

       Front view of wire harness connector (to No. 3 Junction Block)

       *b

       Front view of wire harness connector (to No. 4 Junction Block)

    2. Disconnect the 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 3B-67 - 4A-61 Always Below 1 Ω 3B-67 - Body ground Always 10 kΩ or higher

    
    
    • OKClick here
    • NGClick here
13. Click here

    CHECK NO. 4 JUNCTION BLOCK

    
    
    1. 

       Disconnect the No. 4 junction block connectors.

       Table 19. Text in Illustration

       *A	w/ TOYOTA Parking Assist-sensor System	*B	w/ Entry and Start System
       *C	w/ Tire Pressure Warning System	-	-
       *a	Front view of wire harness connector (to No. 4Junction Block)	-	-

    2. Measure the voltage according to the value(s) in the table below.

       Standard Voltage
       Tester Connection Switch Condition Specified Condition 4A-13 - Body ground*1 Ignition switch ON 4.5 to 14 V 4A-85 - Body ground*2 Ignition switch ON 4.5 to 14 V 4B-61 - Body ground*3 Ignition switch ON 4.5 to 14 V

       
       

       • *1: w/ TOYOTA Parking Assist-sensor System

       • *2: w/ Entry and Start System

       • *3: w/ Tire Pressure Warning System

       Table 20. Result

       Result	Proceed to
       NG (4A-85)	A
       NG (4A-13)	B
       NG (4B-61)	C
       OK	D

    
    
    • AClick here
    • BClick here
    • CClick here
    • DClick here
14. Click here

    CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU CIRCUIT)

    
    
    1. 

       Disconnect the No. 4 junction block connector.

       Table 21. Text in Illustration

       *a

       Front view of wire harness connector (to No. 4 Junction Block)

       *b

       Front view of wire harness connector (to Power Management Control ECU)

    2. Disconnect the power management control ECU connector.

    3. Measure the resistance according to the value(s) in the table below.

       Standard Resistance
       Tester Connection Condition Specified Condition H71-23 (SPD) - 4A-85 Always Below 1 Ω 4A-85 - Body ground Always 10 kΩ or higher

       Table 22. Result

       Result	Proceed to
       OK (for LHD)	A
       OK (for RHD)	B
       NG	C

    
    
    • AClick here
    • BClick here
    • CClick here
15. Click here

    CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY CIRCUIT)

    
    
    1. 

       Disconnect the No. 3 junction block connector.

       Table 23. Text in Illustration

       *a

       Front view of wire harness connector (to No. 3 Junction Block)

       *b

       Front view of wire harness connector (to Radio Receiver Assembly)

    2. Disconnect the radio receiver assembly connector.

    3. Measure the resistance according to the value(s) in the table below.

       Standard Resistance
       Tester Connection Condition Specified Condition H114-17 (SPD) - 3A-43 Always Below 1 Ω 3A-43 - Body ground Always 10 kΩ or higher

    
    
    • OKClick here
    • NGClick here
16. Click here

    CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY CIRCUIT)

    
    
    1. 

       Disconnect the No. 3 junction block connector.

       Table 24. Text in Illustration

       *a

       Front view of wire harness connector (to No. 3 Junction Block)

       *b

       Front view of wire harness connector (to Radio and Display Receiver Assembly)

    2. Disconnect the radio and display receiver assembly connector.

    3. Measure the resistance according to the value(s) in the table below.

       Standard Resistance
       Tester Connection Condition Specified Condition H105-17 (SPD) - 3A-43 Always Below 1 Ω 3A-43 - Body ground Always 10 kΩ or higher

    
    
    • OKClick here
    • NGClick here
17. Click here

    CHECK HARNESS AND CONNECTOR (HEADLIGHT LEVELING ECU ASSEMBLY CIRCUIT)

    
    
    1. 

       Disconnect the No. 3 junction block connector.

       Table 25. Text in Illustration

       *a

       Front view of wire harness connector (to No. 3 Junction Block)

       *b

       Front view of wire harness connector (to Headlight Leveling ECU Assembly)

    2. Disconnect the headlight leveling ECU assembly connector.

    3. Measure the resistance according to the value(s) in the table below.

       Standard Resistance
       Tester Connection Condition Specified Condition A49-16 (SPDR) - 3A-19 Always Below 1 Ω 3A-19 - Body ground Always 10 kΩ or higher

       Table 26. Result

       Result	Proceed to
       OK (for LHD)	A
       OK (for RHD)	B
       NG	C

    
    
    • AClick here
    • BClick here
    • CClick here
18. Click here

    CHECK HARNESS AND CONNECTOR (TCM CIRCUIT)

    
    
    1. 

       Disconnect the No. 3 junction block connector.

       Table 27. Text in Illustration

       *a

       Front view of wire harness connector (to No. 3 Junction Block)

       *b

       Front view of wire harness connector (to TCM)

    2. Disconnect the TCM connector.

    3. Measure the resistance according to the value(s) in the table below.

       Standard Resistance
       Tester Connection Condition Specified Condition C29-3 (SPD) - 3A-54 Always Below 1 Ω 3A-54 - Body ground Always 10 kΩ or higher

    
    
    • OKClick here
    • NGClick here
19. Click here

    CHECK HARNESS AND CONNECTOR (ECM CIRCUIT)

    
    
    1. 

       Disconnect the No. 3 junction block connector.

       Table 28. Text in Illustration

       *A	for AD Series Engine	*B	for ZR Series Engine
       *C	for 1WW Engine	-	-
       *a	Front view of wire harness connector (to No. 3 Junction Block)	*b	Front view of wire harness connector (to ECM)

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

       Standard Resistance
       Table 29. for AD Series Engine Tester Connection Condition Specified Condition A51-14 (SPD) - 3A-20 Always Below 1 Ω 3A-20 - Body ground Always 10 kΩ or higher
       Table 30. for ZR Series Engine Tester Connection Condition Specified Condition A51-38 (SPD) - 3A-20 Always Below 1 Ω 3A-20 - Body ground Always 10 kΩ or higher
       Table 31. for 1WW Engine Tester Connection Condition Specified Condition A76-48 (SPD) - 3A-20 Always Below 1 Ω 3A-20 - Body ground Always 10 kΩ or higher

       Tip:

       *: Replacement procedure:

       
       

       • for 1AD-FTV (Click here)

       • for 2AD-FHV (Click here)

       • for 1ZR-FAE (Click here)

       • for 2ZR-FAE (Click here)

       • for 1WW (Click here)

    
    
    • OKClick here
    • NGClick here
20. Click here

    CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY CIRCUIT)

    
    
    1. 

       Disconnect the No. 4 junction block connector.

       Table 32. Text in Illustration

       *a

       Front view of wire harness connector (to No. 4 Junction Block)

       *b

       Front view of wire harness connector (to Clearance Warning ECU Assembly)

    2. Disconnect the clearance warning ECU assembly connector.

    3. Measure the resistance according to the value(s) in the table below.

       Standard Resistance
       Tester Connection Condition Specified Condition H95-5 (SPD) - 4A-13 Always Below 1 Ω 4A-13 - Body ground Always 10 kΩ or higher

    
    
    • OKClick here
    • NGClick here
21. Click here

    CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU AND RECEIVER CIRCUIT)

    
    
    1. 

       Disconnect the No. 4 junction block connector.

       Table 33. Text in Illustration

       *a

       Front view of wire harness connector (to No. 4 Junction Block)

       *b

       Front view of wire harness connector (to Tire Pressure Warning ECU and Receiver)

    2. Disconnect the tire pressure warning ECU and receiver connector.

    3. Measure the resistance according to the value(s) in the table below.

       Standard Resistance
       Tester Connection Condition Specified Condition N32-2 (SPD) - 4B-61 Always Below 1 Ω 4B-61 - Body ground Always 10 kΩ or higher

    
    
    • OKClick here
    • NGClick here
22. Click here

    REPLACE COMBINATION METER ASSEMBLYClick here

23. Click here

    REPLACE BRAKE ACTUATOR ASSEMBLYClick here

24. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

25. Click here

    REPLACE NO. 3 JUNCTION BLOCK

26. Click here

    REPLACE NO. 4 JUNCTION BLOCK

27. Click here

    REPLACE POWER MANAGEMENT CONTROL ECUClick here

28. Click here

    REPLACE POWER MANAGEMENT CONTROL ECUClick here

29. Click here

    REPLACE RADIO RECEIVER ASSEMBLYClick here

30. Click here

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLYClick here

31. Click here

    REPLACE HEADLIGHT LEVELING ECU ASSEMBLYClick here

32. Click here

    REPLACE HEADLIGHT LEVELING ECU ASSEMBLYClick here

33. Click here

    REPLACE TCMClick here

34. Click here

    REPLACE ECM*

35. Click here

    REPLACE CLEARANCE WARNING ECU ASSEMBLYClick here

36. Click here

    REPLACE TIRE PRESSURE WARNING ECU AND RECEIVERClick here