TIRE PRESSURE WARNING SYSTEM TERMINALS OF ECU


  1. 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

      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
      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.

      Tech Tips

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

      A00YRS9C03
      *A for FMVSS138 Type *B for ECE-R64 Type
      *a

      Component with harness connected

      (Tire Pressure Warning ECU and Receiver)

      		 - -
      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)
      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. A00YV6SC02
      *a Example
      *b GND

      Using an oscilloscope, check waveform 1.

      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

      Tech Tips

      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.