Toyota CH-R Service Manual: Speed Signal Circuit

DESCRIPTION

The combination meter assembly receives the vehicle speed signal from this circuit. The wheel speed sensors produce an output that varies according to the vehicle speed. The wheel speed sensor output is received by the skid control ECU (brake actuator assembly) which uses this information to create the vehicle speed signal*a. The vehicle speed signal consists of pulses sent to the combination meter assembly from the skid control ECU (brake actuator assembly). To create this signal, 12 V is output from IG2 which is behind a resistor in the combination meter assembly. This voltage is sent to the skid control ECU (brake actuator assembly). The pulse signal is created by switching the transistor in the skid control ECU (brake actuator assembly) on and off, making the voltage on the wire drop to 0 V. A similar system is used for the output of this signal from the combination meter assembly via terminal +S. A voltage of 12 V or 5 V is applied to terminal +S from each ECU or relay that is connected to this terminal. The transistor in the combination meter assembly is controlled by the signal from the skid control ECU (brake actuator assembly). When this transistor is turned on, this transistor makes the voltage supplied by the various ECUs (via their respective internal resistors) drop to 0 V. Each ECU connected to terminal +S of the combination meter assembly controls its respective system based on this pulse signal.

  • *a: This vehicle speed signal is created by the skid control ECU (brake actuator assembly). There is no actual component that is referred to as the vehicle speed sensor. In addition, for some systems, vehicle speed information may be received via CAN communication.

HINT:

This circuit is used for the systems connected to terminal +S. This signal is not used for combination meter assembly operation. Combination meter assembly components such as the speedometer operate using data received via CAN communication.

WIRING DIAGRAM

w/o Navigation System

w/ Navigation System

CAUTION / NOTICE / HINT

NOTICE:

  • Before replacing the ECM refer to Registration.
    • w/ Smart Key System:

      Click here

    • w/o Smart Key System:

      Click here

  • Before replacing the certification ECU (smart key ECU assembly) refer to Registration.*1

    Click here

  • When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.
    • *1 w/ Smart Key System

PROCEDURE

1.

INSPECT ECU TERMINAL VOLTAGE (INPUT VOLTAGE)

(a) Disconnect the combination meter assembly connector.

*a

Front view of wire harness connector

(to Combination Meter Assembly)

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

F4-6 (+S) - Body ground

Ignition switch ON

4.5 to 14 V

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.

NG

GO TO STEP 5

OK

2.

INSPECT COMBINATION METER ASSEMBLY (OUTPUT VOLTAGE)

(a) Reconnect the F4 combination meter assembly connector.

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

*a

Front view of wire harness connector

(to Brake Actuator Assembly (Skid Control ECU))

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

A42-34 (SP1) - Body ground

Ignition switch ON

11 to 14 V

NG

GO TO STEP 4

OK

3.

INSPECT SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) (INPUT WAVEFORM)

(a) Check the input waveform.

(1) Reconnect the A42 skid control ECU (brake actuator assembly) connector.

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

(3) Connect an oscilloscope to terminal F4-5 (SI) and body ground.

(4) Turn the ignition switch ON.

(5) Turn a wheel slowly.

(6) 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

Ignition switch ON 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.

*a

Component with harness connected

(Combination Meter Assembly)

OK

REPLACE COMBINATION METER ASSEMBLY

NG

REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)

4.

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

(a) Disconnect the F4 combination meter assembly connector.

(b) Disconnect the A42 skid control ECU (brake actuator assembly) connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F4-5 (SI) - A42-34 (SP1)

Always

Below 1 Ω

F4-5 (SI) - Body ground

Always

10 kΩ or higher

OK

REPLACE COMBINATION METER ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.

CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - EACH ECU)

(a) Disconnect the A38 ECM connector.

(b) Disconnect the F1 certification ECU (smart key ECU assembly) connector.*1

(c) Disconnect the F56 windshield wiper relay assembly connector.*2

(d) Disconnect the F47 radio receiver assembly connector.*3

(e) Disconnect the F129 radio and display receiver assembly connector.*4

(f) Disconnect the F135 navigation ECU assembly connector.*5

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

  • *1: w/ Smart Key System
  • *2: w/ Rain Sensor
  • *3: for Radio Receiver Type
  • *4: for Radio and Display Type
  • *5: w/ Navigation System

Standard Resistance:

Tester Connection

Condition

Specified Condition

F4-6 (+S) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

6.

CONFIRM MODEL

(a) Choose the model to be inspected.

Result

Proceed to

w/ Navigation System

A

w/o Navigation System

B

B

GO TO STEP 11

A

7.

INSPECT NAVIGATION ECU (SHORT CIRCUIT IN NAVIGATION ECU)

(a) Disconnect the F135 navigation ECU assembly connector.

(b) Reconnect the A38 ECM connector.

(c) Reconnect the F1 certification ECU (smart key ECU assembly) connector.

(d) Reconnect the F56 windshield wiper relay assembly connector.

(e) Reconnect the F129 radio and display receiver assembly connector.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

F4-6 (+S) - Body ground

Ignition switch ON

4.5 to 14 V

HINT:

If the result is as specified, there may be a short circuit in the navigation ECU.

(g) Reconnect the F135 navigation ECU assembly connector.

OK

REPLACE NAVIGATION ECU ASSEMBLY

NG

8.

INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY (SHORT CIRCUIT IN RADIO AND DISPLAY RECEIVER ASSEMBLY)

(a) Disconnect the F129 radio and display receiver assembly connector.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

F4-6 (+S) - Body ground

Ignition switch ON

4.5 to 14 V

HINT:

If the result is as specified, there may be a short circuit in the radio and display receiver assembly.

(c) Reconnect the F129 radio and display receiver assembly connector.

OK

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

NG

9.

INSPECT CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (SHORT CIRCUIT IN CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))

(a) Disconnect the F1 certification ECU (smart key ECU assembly) connector.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

F4-6 (+S) - Body ground

Ignition switch ON

4.5 to 14 V

HINT:

If the result is as specified, there may be a short circuit in the certification ECU (smart key ECU assembly).

(c) Reconnect the F1 certification ECU (smart key ECU assembly) connector.

OK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

NG

10.

INSPECT WINDSHIELD WIPER RELAY ASSEMBLY (SHORT CIRCUIT IN WINDSHIELD WIPER RELAY ASSEMBLY)

(a) Disconnect the F56 windshield wiper relay assembly connector.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

F4-6 (+S) - Body ground

Ignition switch ON

4.5 to 14 V

HINT:

If the result is as specified, there may be a short circuit in the windshield wiper relay assembly.

(c) Reconnect the F56 windshield wiper relay assembly connector.

OK

REPLACE WINDSHIELD WIPER RELAY ASSEMBLY

NG

REPLACE ECM

11.

CONFIRM MODEL

(a) Choose the model to be inspected.

Result

Proceed to

w/ Smart Key System

A

w/o Smart Key System

B

B

GO TO STEP 13

A

12.

INSPECT CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) (SHORT CIRCUIT IN CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))

(a) Disconnect the F1 certification ECU (smart key ECU assembly) connector.

(b) Reconnect the A38 ECM connector.

(c) Reconnect the F56 windshield wiper relay assembly connector.*1

(d) Reconnect the F47 radio receiver assembly connector.*2

(e) Reconnect the F129 radio and display receiver assembly connector.*3

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

  • *1: w/ Rain Sensor
  • *2: for Radio Receiver Type
  • *3: for Radio and Display Type

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

F4-6 (+S) - Body ground

Ignition switch ON

4.5 to 14 V

HINT:

If the result is as specified, there may be a short circuit in the certification ECU (smart key ECU assembly).

(g) Reconnect the F1 certification ECU (smart key ECU assembly) connector.

OK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

NG

13.

CONFIRM MODEL

(a) Choose the model to be inspected.

Result

Proceed to

w/ Rain Sensor

A

w/o Rain Sensor

B

B

GO TO STEP 15

A

14.

INSPECT WINDSHIELD WIPER RELAY ASSEMBLY (SHORT CIRCUIT IN WINDSHIELD WIPER RELAY ASSEMBLY)

(a) Disconnect the F56 windshield wiper relay assembly connector.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

F4-6 (+S) - Body ground

Ignition switch ON

4.5 to 14 V

HINT:

If the result is as specified, there may be a short circuit in the windshield wiper relay assembly.

(c) Reconnect the F56 windshield wiper relay assembly connector.

OK

REPLACE WINDSHIELD WIPER RELAY ASSEMBLY

NG

15.

CONFIRM MODEL

(a) Choose the model to be inspected.

Result

Proceed to

w/ Audio and Visual System (for Radio Receiver Type)

A

w/ Audio and Visual System (for Radio and Display Type)

B

w/o Audio and Visual System

C

B

GO TO STEP 17

C

REPLACE ECM

A

16.

INSPECT RADIO RECEIVER ASSEMBLY (SHORT CIRCUIT IN RADIO RECEIVER ASSEMBLY)

(a) Disconnect the F47 radio receiver assembly connector.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

F4-6 (+S) - Body ground

Ignition switch ON

4.5 to 14 V

HINT:

If the result is as specified, there may be a short circuit in the radio receiver assembly.

(c) Reconnect the F47 radio receiver assembly connector.

OK

REPLACE RADIO RECEIVER ASSEMBLY

NG

REPLACE ECM

17.

INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY (SHORT CIRCUIT IN RADIO AND DISPLAY RECEIVER ASSEMBLY)

(a) Disconnect the F129 radio and display receiver assembly connector.

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

F4-6 (+S) - Body ground

Ignition switch ON

4.5 to 14 V

HINT:

If the result is as specified, there may be a short circuit in the radio and display receiver assembly.

(c) Reconnect the F129 radio and display receiver assembly connector.

OK

REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

NG

REPLACE ECM

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