CHARGING SYSTEM > TERMINALS OF ECU

for Preparation Click here



CHECK POWER MANAGEMENT CONTROL ECU (w/o Entry and Start System)

A197743E03

  1. Measure the voltage and resistance according to the value(s) in the table below.

    HINT:
    Perform the measurements with the connectors connected.


    Terminal No. (Symbol)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    D37-14 (RLO) - D39-12 (GND)
    		G - W-B
    		Generator
    		After engine warmed up, during charging control, vehicle driven at constant speed
    		Pulse generation (see waveform 1)
    After engine warmed up, during charging control, vehicle accelerated
    		Pulse generation (see waveform 2)
    After engine warmed up, during charging control, vehicle decelerated
    		Pulse generation (see waveform 3)
    D37-12 (VC) - D37-18 (E2)
    		W - LG
    		Power source of battery current sensor assembly
    		Ignition switch ON
    		4.5 to 5.5 V
    D37-15 (THB) - D37-18 (E2)
    		SB - LG
    		Battery temperature sensor
    		Ignition switch ON
    		0.2 to 4.8 V
    D37-13 (IB) - D37-18 (E2)
    		Y - LG
    		Battery current sensor
    		Ignition switch ON
    		0.2 to 4.8 V
    D37-18 (E2) - Body ground
    		LG - Body ground
    		Sensor ground
    		Always
    		Below 1 Ω
    D39-8 (AM21) - D39-12 (GND)
    		P - W-B
    		Battery power
    		Always
    		11 to 14 V
    D39-1 (INH) - D39-12 (GND)
    		V - W-B
    		Windshield wiper switch assembly
    		Ignition switch ON
    Windshield wiper switch "HI" position
    		11 to 14 V
    D37-5 (STA) - D39-12 (GND)
    		L - W-B
    		Starter assembly
    		Cranking
    		5.5 V or more
    D39-2 (IG2) - D39-12 (GND)
    		L - W-B
    		IG2 relay
    		Ignition switch ON
    		11 to 14 V
    D39-9 (PNL) - D39-12 (GND)
    		G - W-B
    		PANEL fuse
    		Light control switch OFF → TAIL
    		Below 1 V → 11 to 14 V
    If the result is not as specified, the ECU may have a malfunction.



    2. A084458E02

  2. Using an oscilloscope, check the signal waveform of the ECU.

    HINT:
    The oscilloscope waveform shown in the illustration is an example for reference only. Waveforms with noise or chattering are not shown.


    1. Waveform 1
      Tester Connection
      		Tool Setting
      		Vehicle Condition
      		Specified Condition
      D37-14 (RLO) - D39-12 (GND)
      		2 V/DIV., 50 msec./DIV.
      		After engine warmed up, during charging control, vehicle driven at constant speed
      		Correct waveform as shown in illustration

      HINT:
      As the duty cycle changes in accordance with the electrical load and battery condition, the output waveform also changes.



      2. A084456E02

    2. Waveform 2
      Tester Connection
      		Tool Setting
      		Vehicle Condition
      		Specified Condition
      D37-14 (RLO) - D39-12 (GND)
      		2 V/DIV., 50 msec./DIV.
      		After engine warmed up, during charging control, vehicle accelerated
      		Correct waveform as shown in illustration

      HINT:
      As the duty cycle changes in accordance with the electrical load and battery condition, the output waveform also changes.



      3. A084457E02

    3. Waveform 3
      Tester Connection
      		Tool Setting
      		Vehicle Condition
      		Specified Condition
      D37-14 (RLO) - D39-12 (GND)
      		2 V/DIV., 50 msec./DIV.
      		After engine warmed up, during charging control, vehicle decelerated
      		Correct waveform as shown in illustration

      HINT:
      As the duty cycle changes in accordance with the electrical load and battery condition, the output waveform also changes.


CHECK POWER MANAGEMENT CONTROL ECU (w/ Entry and Start System)

C185499E11

  1. Measure the voltage and resistance according to the value(s) in the table below.

    HINT:
    Perform the measurements with the connectors connected.


    Terminal No. (Symbol)
    		Wiring Color
    		Terminal Description
    		Condition
    		Specified Condition
    D36-10 (RLO) - D38-6 (GND)
    		G - W-B
    		Generator
    		After engine warmed up, during charging control, vehicle driven at constant speed
    		Pulse generation (see waveform 1)
    After engine warmed up, during charging control, vehicle accelerated
    		Pulse generation (see waveform 2)
    After engine warmed up, during charging control, vehicle decelerated
    		Pulse generation (see waveform 3)
    D36-23 (VC) - D36-25 (E2)
    		W - LG
    		Power source of battery current sensor assembly
    		Ignition switch ON
    		4.5 to 5.5 V
    D36-28 (THB) - D36-25 (E2)
    		SB - LG
    		Battery temperature sensor
    		Ignition switch ON
    		0.2 to 4.8 V
    D36-30 (IB) - D36-25 (E2)
    		Y - LG
    		Battery current sensor
    		Ignition switch ON
    		0.2 to 4.8 V
    D36-25 (E2) - Body ground
    		LG - Body ground
    		Sensor ground
    		Always
    		Below 1 Ω
    D38-2 (AM21) - D38-6 (GND)
    		R - W-B
    		Battery power
    		Always
    		11 to 14 V
    D38-1 (AM22) - D38-6 (GND)
    		L - W-B
    		Battery power
    		Always
    		11 to 14 V
    D38-9 (INH) - D38-6 (GND)
    		V - W-B
    		Windshield wiper switch assembly
    		Ignition switch ON
    Windshield wiper switch "HI" position
    		11 to 14 V
    D36-2 (STA) - D38-6 (GND)
    		L - W-B
    		Starter assembly
    		Cranking
    		5.5 V or more
    If the result is not as specified, the ECU may have a malfunction.



  2. Using an oscilloscope, check the signal waveform of the ECU.

    HINT:
    The oscilloscope waveform shown in the illustration is an example for reference only. Waveforms with noise or chattering are not shown.




      A084458E02

    1. Waveform 1
      Tester Connection
      		Tool Setting
      		Vehicle Condition
      		Specified Condition
      D36-10 (RLO) - D38-6 (GND)
      		2 V/DIV., 50 msec./DIV.
      		After engine warmed up, during charging control, vehicle driven at constant speed
      		Correct waveform as shown in illustration

      HINT:
      As the duty cycle changes in accordance with the electrical load and battery condition, the output waveform also changes.



      2. A084456E02

    2. Waveform 2
      Tester Connection
      		Tool Setting
      		Vehicle Condition
      		Specified Condition
      D36-10 (RLO) - D38-6 (GND)
      		2 V/DIV., 50 msec./DIV.
      		After engine warmed up, during charging control, vehicle accelerated
      		Correct waveform as shown in illustration

      HINT:
      As the duty cycle changes in accordance with the electrical load and battery condition, the output waveform also changes.



      3. A084457E02

    3. Waveform 3
      Tester Connection
      		Tool Setting
      		Vehicle Condition
      		Specified Condition
      D36-10 (RLO) - D38-6 (GND)
      		2 V/DIV., 50 msec./DIV.
      		After engine warmed up, during charging control, vehicle decelerated
      		Correct waveform as shown in illustration

      HINT:
      As the duty cycle changes in accordance with the electrical load and battery condition, the output waveform also changes.