TIRE PRESSURE WARNING SYSTEM TERMINALS OF ECU

  1. C279757C09

    *a

    Front view of wire harness connector

    (to Tire Pressure Warning ECU and Receiver)

    -

    -

    CHECK TIRE PRESSURE WARNING ECU AND RECEIVER

    1. Disconnect the tire pressure warning ECU and receiver M30 connector and measure the voltage or resistance on the wire harness side.

      Terminal No. (Symbol)

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      M30-1 (IG) - M30-12 (GND)

      L - W-B

      IG power source

      Ignition switch ON

      10 to 16 V

      M30-12 (GND) - Body ground

      W-B - Body ground

      Ground

      Always

      Below 1 Ω

    2. Connect the tire pressure warning ECU and receiver M30 connector.

    3. Measure the voltage and resistance according to the value(s) in the table below. If the result is not as specified, the ECU may have a malfunction.

      Tip:

      Inspect the connectors from the back side while the connectors are connected.

      E129452C22

      *a

      Component with harness connected

      (Tire Pressure Warning ECU and Receiver)

      -

      -

      Terminal No. (Symbol)

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      M30-3 (CLSW) - M30-12 (GND)

      V - W-B

      Tire pressure warning reset switch

      • Ignition switch ON

      • Tire pressure warning reset switch ON

      Below 1.5 V

      • Ignition switch ON

      • Tire pressure warning reset switch OFF

      8 to 15 V

      M30-4 (RDA2) - M30-12 (GND)

      G - W-B

      Output signals

      Ignition switch ON

      Pulse generation (see waveform 1)

      M30-5 (PRG2) - M30-12 (GND)

      W - W-B

      Input signals

      Ignition switch ON

      Pulse generation (see waveform 1)
    4. C240058C02

      *a

      Example

      *b

      GND

      Using an oscilloscope, check waveform 1.

      Table 1. Waveform 1:

      Item

      Contents

      Terminal

      M30-4 (RDA2) - M30-12 (GND)

      M30-5 (PRG2) - M30-12 (GND)

      Tool setting

      5 V/DIV, 5 ms./DIV.

      Vehicle condition

      Ignition switch ON
      Tip:

      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.