Toyota CH-R Service Manual: Vehicle Speed Signal Circuit between Navigation ECU and Combination Meter

Toyota CH-R Service Manual / Navigation / Multi Info Display / Navigation System / Vehicle Speed Signal Circuit between Navigation ECU and Combination Meter

DESCRIPTION

The navigation ECU receives a vehicle speed signal from the combination meter assembly.

HINT:

  • A voltage of 12 V or 5 V is output from each ECU and then input to the combination meter assembly. The signal is changed to a pulse signal at the transistor in the combination meter assembly. Each ECU controls its respective systems based on this pulse signal.
  • If a short occurs in any of the ECUs or in the wire harness connected to an ECU, all systems in the following diagram will not operate normally.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Depending on the parts that are replaced during vehicle inspection or maintenance, performing initialization, registration or calibration may be needed. Refer to Precaution for Navigation System.

    Click here

  • When replacing the radio and display receiver assembly or navigation ECU, always replace it with a new one. If a radio and display receiver assembly or navigation ECU which was installed to another vehicle is used, the following may occur:
    • A communication malfunction DTC may be stored.
    • The radio and display receiver assembly or navigation ECU may not operate normally.

PROCEDURE

1.

CHECK COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM)

(a) Check the output waveform.

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

(2) Connect an oscilloscope to terminal F4-6 (+S) and body ground.

(3) Turn the engine 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

F4-6 (+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.

*a

Component with harness connected

(Combination Meter Assembly)
NG

GO TO METER / GAUGE SYSTEM

OK

2.

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

(a) Disconnect the F135 navigation ECU connector.

(b) Disconnect the F4 combination meter assembly connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

F135-9 (SPD) - F4-6 (+S)

Always

Below 1 Ω
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
    Mute Signal Circuit between Radio Receiver and Telematics Transceiver
    DESCRIPTION The telematics transceiver sends a mute signal to the radio and display receiver assembly. The radio and display receiver assembly controls the volume according to the mute signal fr ...

    Reverse Signal Circuit
    DESCRIPTION The radio and display receiver assembly receives a reverse signal from the park/neutral position switch. WIRING DIAGRAM PROCEDURE 1. CHECK VEHICLE SIGNAL (OP ...

    Other materials:

    Toyota CH-R Service Manual > Continuously Variable Transaxle System: Transmission Fluid Pressure Sensor/Switch "A" Circuit Low (P0842,P0843)
    DESCRIPTION The ECM performs learning control for the belt clamping pressure based on the belt clamping pressure signal, which is output by the oil pressure sensor. DTC No. Detection Item DTC Detection Condition Trouble Area MIL M ...

    Toyota CH-R Service Manual > Can Communication System: Front Camera Module Communication Stop Mode
    DESCRIPTION Detection Item Symptom Trouble Area Front Camera Module Communication Stop Mode Any of the following conditions are met: Communication stop for "Front Camera Module" is indicated on the "Comm ...

    Toyota C-HR (AX20) 2023-2026 Owner's Manual

    Toyota CH-R Owners Manual

    Toyota CH-R Service Manual

    © 2017-2026 Copyright www.tochr.net
    0.0097