TIRE PRESSURE WARNING SYSTEM TERMINALS OF ECU

  1. C279757C02

    *A

    for FMVSS138 Type

    *B

    for ECE-R64 Type

    *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 M11*1 or M30*2 connector and measure the voltage or resistance on the wire harness side.

      • *1: for FMVSS138 Type

      • *2: for ECE-R64 Type

      Table 1. for FMVSS138 Type

      Terminal No. (Symbol)

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      M11-1 (IG) - M11-12 (E)

      L - W-B

      IG power source

      Ignition switch ON

      10 to 16 V

      M11-7 (+B) - M11-12 (E)

      R - W-B

      Power supply (from battery)

      Always

      10 to 16 V

      M11-12 (E) - Body ground

      W-B - Body ground

      Ground

      Always

      Below 1 Ω
      Table 2. for ECE-R64 Type

      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 M11*1 or M30*2 connector.

      • *1: for FMVSS138 Type

      • *2: for ECE-R64 Type

    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.

      E129452C03

      *A

      for FMVSS138 Type

      *B

      for ECE-R64 Type

      *a

      Component with harness connected

      (Tire Pressure Warning ECU and Receiver)

      -

      -
      Table 3. for FMVSS138 Type

      Terminal No. (Symbol)

      Wiring Color

      Terminal Description

      Condition

      Specified Condition

      M11-3 (CLSW) - M11-12 (E)

      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

      M11-4 (RDA) - M11-12 (E)

      G - W-B

      Output signals

      Ignition switch ON

      Pulse generation (see waveform 1)

      M11-5 (PRG) - M11-12 (E)

      W - W-B

      Input signals

      Ignition switch ON

      Pulse generation (see waveform 1)
      Table 4. for ECE-R64 Type

      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 5. Waveform 1:

      Item

      Contents

      Terminal

      M11-4 (RDA) - M11-12 (E)*1

      M11-5 (PRG) - M11-12 (E)*1

      M30-4 (RDA2) - M30-12 (GND)*2

      M30-5 (PRG2) - M30-12 (GND)*2

      Tool setting

      5 V/DIV, 5 ms./DIV.

      Vehicle condition

      Ignition switch ON

      • *1: for FMVSS138 Type

      • *2: for ECE-R64 Type

      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.