Meter / Gauge System (For Hatchback) Speed Signal Circuit

Vehicle Interior. Yaris. Ncp93, 131
Meter Gauge Display. Yaris. Ncp93, 131

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT COMBINATION METER ASSEMBLY (INPUT VOLTAGE)

SYSTEM CHECK

INSPECT COMBINATION METER ASSEMBLY (OUTPUT VOLTAGE)

INSPECT COMBINATION METER ASSEMBLY (INPUT WAVEFORM)

INSPECT COMBINATION METER ASSEMBLY (OUTPUT VOLTAGE)

INSPECT COMBINATION METER ASSEMBLY (INPUT WAVEFORM)

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

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - SPEEDOMETER SENSOR)

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

INSPECT ECM

SYSTEM CHECK

INSPECT POWER STEERING ECU ASSEMBLY

CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - ECM)

CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - POWER STEERING ECU ASSEMBLY)

METER / GAUGE SYSTEM (for Hatchback) - Speed Signal Circuit


DESCRIPTION

w/ ABS:
  1. The meter CPU receives vehicle speed signals from this circuit. The vehicle speed sensor detects the voltage that varies according to the vehicle speed. The brake actuator assembly supplies power to the vehicle speed sensor. The brake actuator assembly detects vehicle speed signals based on the pulses of the voltage. The brake actuator assembly transmits vehicle speed signals as pulses to the meter CPU. A voltage of 12 V is output from the combination meter assembly and then input to the brake actuator assembly. The signal is changed to a pulse signal at the transistor in the combination meter assembly.
  2. A voltage of 12 V or 5 V is output from each ECU or relay and then input to the combination meter assembly.
  3. Each ECU controls the respective system based on the pulse signal.
HINT:
This circuit is used for another system, and is not used for combination meter operation.
w/o ABS:
  1. The meter CPU receives vehicle speed signals from this circuit. The speedometer sensor detects the voltage that varies according to the vehicle speed. The speedometer sensor detects vehicle speed signals based on the pulses of the voltage. The speedometer sensor transmits vehicle speed signals as pulses to the meter CPU. A voltage of 12 V is output from the combination meter assembly and then input to the speedometer sensor. The signal is changed to a pulse signal at the transistor in the combination meter assembly.
  2. A voltage of 12 V or 5 V is output from each ECU or relay and then input to the combination meter assembly.
  3. Each ECU controls the respective system based on the pulse signal.
HINT:
This circuit is used for another system, and is not used for combination meter operation.

WIRING DIAGRAM


Yaris. Ncp93, 131.Meter Gauge Display.Meter / Gauge System (For Sedan).Meter / Gauge System (For Hatchback) Speed Signal Circuit


INSPECTION PROCEDURE

1.INSPECT COMBINATION METER ASSEMBLY (INPUT VOLTAGE)


    Yaris. Ncp93, 131.Meter Gauge Display.Meter / Gauge System (For Sedan).Meter / Gauge System (For Hatchback) Speed Signal Circuit

  1. Disconnect the D100 combination meter assembly connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D100-6 (+S) - Body ground
    		Ignition switch ON
    		4.5 to 14 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Combination Meter Assembly)
    HINT:
    If any of the ECUs specified in the wiring diagram supplies power to the combination meter assembly, the combination meter assembly will output a waveform.

  1. Reconnect the combination meter assembly connector.



NG
Go to step 9
OK


2.SYSTEM CHECK

  1. Check the vehicle specifications.

    Result
    Result
    		Proceed to
    w/ ABS
    		A
    w/o ABS
    		B


B
Go to step 5
A


3.INSPECT COMBINATION METER ASSEMBLY (OUTPUT VOLTAGE)


    Yaris. Ncp93, 131.Meter Gauge Display.Meter / Gauge System (For Sedan).Meter / Gauge System (For Hatchback) Speed Signal Circuit

  1. Disconnect the A70*1 or A71*2 brake actuator assembly connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A70-11 (SP1)*1 - Body ground
    A71-22 (SP1)*2 - Body ground
    		Ignition switch ON
    		11 to 14 V
    Text in Illustration
    *A
    		w/ VSC
    *B
    		w/o VSC
    *a
    		Front view of wire harness connector
    (to brake actuator assembly)

  1. Reconnect the A70*1 or A71*2 brake actuator assembly connector.

  1. *1: w/ VSC
  2. *2: w/o VSC


NG
Go to step 7
OK


4.INSPECT COMBINATION METER ASSEMBLY (INPUT WAVEFORM)


    Yaris. Ncp93, 131.Meter Gauge Display.Meter / Gauge System (For Sedan).Meter / Gauge System (For Hatchback) Speed Signal Circuit

  1. Check the input waveform.

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

    2. Connect an oscilloscope to terminal D100-5 (SI) and body ground.

    3. Turn the ignition switch to ON.

    4. Turn the wheel slowly.

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

      Standard:
      Item
      		Condition
      Tool setting
      		5 V/DIV., 20 ms./DIV.
      Condition
      		Driving at approx. 20 km/h
      Text in Illustration
      *a
      		Component with harness connected
      (Combination Meter Assembly)
      *b
      		Waveform
      OK:
      The waveform is displayed as shown in the illustration.
      HINT:
      As the vehicle speed increases, the cycle of the waveform narrows.


NG
REPLACE BRAKE ACTUATOR ASSEMBLY (YARIS_NCP93 RM000001BXP02KX.html)
OK

REPLACE COMBINATION METER ASSEMBLY (YARIS_NCP93 RM0000035EJ00BX.html)

5.INSPECT COMBINATION METER ASSEMBLY (OUTPUT VOLTAGE)


    Yaris. Ncp93, 131.Meter Gauge Display.Meter / Gauge System (For Sedan).Meter / Gauge System (For Hatchback) Speed Signal Circuit

  1. Disconnect the C57 speedometer sensor connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    C57-3 (SI) - Body ground
    		Ignition switch ON
    		11 to 14 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Speedometer Sensor)

  1. Reconnect the C57 speedometer sensor connector.



NG
Go to step 8
OK


6.INSPECT COMBINATION METER ASSEMBLY (INPUT WAVEFORM)


    Yaris. Ncp93, 131.Meter Gauge Display.Meter / Gauge System (For Sedan).Meter / Gauge System (For Hatchback) Speed Signal Circuit

  1. Check the input waveform.

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

    2. Connect an oscilloscope to terminal D100-5 (SI) and body ground.

    3. Turn the ignition switch to ON.

    4. Turn the wheel slowly.

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

      Item
      		Condition
      Tool setting
      		5 V/DIV., 20 ms./DIV.
      Vehicle condition
      		Driving at approx. 20 km/h (12 mph)
      OK:
      The waveform is displayed as shown in the illustration.
      HINT:
      As the vehicle speed increases, the cycle of the waveform narrows.
      Text in Illustration
      *a
      		Component with harness connected
      (Combination Meter Assembly)
      *b
      		Waveform


NG
REPLACE SPEEDOMETER SENSOR
OK

REPLACE COMBINATION METER ASSEMBLY (YARIS_NCP93 RM0000035EJ00BX.html)

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

  1. Disconnect the D100 combination meter assembly connector.

  1. Disconnect the A70*1 or A71*2 brake actuator assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D100-5 (SI) - A70-11 (SP1)*1
    D100-5 (SI) - A71-22 (SP1)*2
    		Always
    		Below 1 Ω
    D100-5 (SI) - Body ground
    		Always
    		10 kΩ or higher
    1. *1: w/ VSC
    2. *2: w/o VSC


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE COMBINATION METER ASSEMBLY (YARIS_NCP93 RM0000035EJ00BX.html)

8.CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - SPEEDOMETER SENSOR)

  1. Disconnect the D100 combination meter assembly connector.

  1. Disconnect the C57 speedometer sensor connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    C57-3 (SI) - D100-5 (SI)
    		Always
    		Below 1 Ω
    C57-3 (SI) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE COMBINATION METER ASSEMBLY (YARIS_NCP93 RM0000035EJ00BX.html)

9.CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

  1. Disconnect the 3B instrument panel junction block assembly connector.

  1. Disconnect the D100 combination meter assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    D100-6 (+S) - 3B-15
    		Always
    		Below 1 Ω
    D100-6 (+S) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the 3B instrument panel junction block assembly connector.

  1. Reconnect the D100 combination meter assembly connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


10.INSPECT ECM


    Yaris. Ncp93, 131.Meter Gauge Display.Meter / Gauge System (For Sedan).Meter / Gauge System (For Hatchback) Speed Signal Circuit

  1. Disconnect the 3C instrument panel junction block assembly connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    3C-39 - Body ground
    		Ignition switch ON
    		4.5 to 14 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Instrument Panel Junction Block Assembly)

  1. Reconnect the 3C instrument panel junction block assembly connector.



NG
Go to step 13
OK


11.SYSTEM CHECK

  1. Check the vehicle specifications.

    Result
    Result
    		Proceed to
    w/ ABS
    		A
    w/o ABS
    		B


B
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (YARIS_NCP93 RM000003TOE00CX.html)
A


12.INSPECT POWER STEERING ECU ASSEMBLY


    Yaris. Ncp93, 131.Meter Gauge Display.Meter / Gauge System (For Sedan).Meter / Gauge System (For Hatchback) Speed Signal Circuit

  1. Disconnect the 3A instrument panel junction block assembly connector.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    3A-37 - Body ground
    		Ignition switch ON
    		4.5 to 14 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Instrument Panel Junction Block Assembly)

  1. Reconnect the 3A instrument panel junction block assembly connector.



NG
Go to step 14
OK

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (YARIS_NCP93 RM000003TOE00CX.html)

13.CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - ECM)

  1. Disconnect the 3C instrument panel junction block assembly connector.

  1. Disconnect the A72 ECM connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    3C-39 - A72-44 (SPD)
    		Always
    		Below 1 Ω
    3C-39 - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the 3C instrument panel junction block assembly connector.

  1. Reconnect the A72 ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM (YARIS_NCP93 RM000001CN002IX.html)

14.CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - POWER STEERING ECU ASSEMBLY)

  1. Disconnect the 3A instrument panel junction block assembly connector.

  1. Disconnect the D104 power steering ECU connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    3A-37 - D104-2 (SPD)
    		Always
    		Below 1 Ω
    3A-37 - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the 3A instrument panel junction block assembly connector.

  1. Reconnect the D104 power steering ECU connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE POWER STEERING ECU ASSEMBLY (YARIS_NCP93 RM000002XN603ZX.html)