Toyota CH-R Service Manual: Terminals Of Ecu

Toyota CH-R Service Manual / Tire Pressure Monitoring / Tire Pressure Warning System / Terminals Of Ecu

TERMINALS OF ECU

CHECK TIRE PRESSURE WARNING ECU AND RECEIVER

(a) Disconnect the M23 tire pressure warning ECU and receiver connector and measure the voltage or resistance on the wire harness side.

*a

Front view of wire harness connector

(to Tire Pressure Warning ECU and Receiver)

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

M23-1 (IG) - M23-12 (GND)

SB - W-B

IG power source

Ignition switch to ON

10 to 16 V

M23-7 (+B) - M23-12 (GND)

R - W-B (*1)

B - W-B (*2)

Power supply (from battery)

Always

10 to 16 V

M23-12 (GND) - Body ground

W-B - Body ground

Ground

Always

Below 1 Ω
  • *1: w/o Smart Key System
  • *2: w/ Smart Key System

(b) Connect the M23 tire pressure warning ECU and receiver connector.

(c) Measure the voltage and resistance according to the value(s) in the table below. If the result is not as specified, the ECU may be malfunctioning.

HINT:

Measure the values on the wire harness side while the connector is connected.

*a

Component with harness connected

(Tire Pressure Warning ECU and Receiver)

-

-

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

M23-3 (CLSW) - M23-12 (GND)

Y - W-B

Tire pressure warning reset switch
  • Ignition switch to ON
  • Steering pad switch assembly operated, "TPMS" selected on the multi-information display and "ENTER" switch (steering pad switch assembly) pressed and held

Below 1.5 V
  • Ignition switch to ON
  • "ENTER" switch (steering pad switch assembly) off

8 to 15 V

M23-4 (RDA) - M23-12 (GND)

G - W-B

Output signals

Ignition switch to ON

Pulse generation (see waveform 1)

M23-5 (PRG) - M23-12 (GND)

W - W-B

Input signals

Ignition switch to ON

Pulse generation (see waveform 1)

(d) Using an oscilloscope, check waveform 1.

*a

Example

*b

GND
Waveform 1:

Item

Contents

Terminal

M23-4 (RDA) - M23-12 (GND)

M23-5 (PRG) - M23-12 (GND)

Tool setting

5 V/DIV, 5 ms./DIV.

Vehicle condition

Ignition switch to ON

HINT:

The waveform shown in the illustration is an example. If the tester displays a waveform that alternates between high and low, where high is a voltage that is between the IG power source voltage and a voltage 2.2 V lower than the IG power source voltage, and where low is a voltage of between 0 and 1.2 V, the ECU can be judged normal.

    Problem Symptoms Table
    PROBLEM SYMPTOMS TABLE HINT: Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are lis ...

    Diagnosis System
    DIAGNOSIS SYSTEM CHECK WARNING LIGHT NOTICE: When there is a problem with the tire pressure warning system, the tire pressure warning light blinks at 0.5 second intervals, and illuminat ...

    Other materials:

    Toyota CH-R Service Manual > Occupant Classification System: Rear Occupant Classification Sensor LH Circuit Malfunction (B1782)
    DESCRIPTION The rear occupant classification sensor LH circuit consists of the occupant detection ECU and rear in weight detection sensor sub-assembly. DTC B1782 is stored when a malfunction is detected in the rear in weight detection sensor sub-assembly circuit. DTC No. ...

    Toyota CH-R Service Manual > Rear Center Seat Outer Belt Assembly: Inspection
    INSPECTION PROCEDURE 1. INSPECT REAR CENTER SEAT OUTER BELT ASSEMBLY (a) Before installing the rear center seat outer belt assembly, check the ELR function. NOTICE: Do not disassemble the retractor. (1) When the inclination of the retractor is between 0° and 20°, check ...

    Toyota C-HR (AX20) 2023-2025 Owner's Manual

    Toyota CH-R Owners Manual

    Toyota CH-R Service Manual

    © 2017-2025 Copyright www.tochr.net
    0.0141