Toyota CH-R Service Manual: 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.

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