CHARGING SYSTEM TERMINALS OF ECU
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CHECK POWER MANAGEMENT CONTROL ECU (w/o Entry and Start System)
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Measure the voltage and resistance according to the value(s) in the table below.
Tech Tips
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.
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Using an oscilloscope, check the signal waveform of the ECU.
Tech Tips
The oscilloscope waveform shown in the illustration is an example for reference only. Waveforms with noise or chattering are not shown.
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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 Tech Tips
As the duty cycle changes in accordance with the electrical load and battery condition, the output waveform also changes.
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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 Tech Tips
As the duty cycle changes in accordance with the electrical load and battery condition, the output waveform also changes.
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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 Tech Tips
As the duty cycle changes in accordance with the electrical load and battery condition, the output waveform also changes.
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CHECK POWER MANAGEMENT CONTROL ECU (w/ Entry and Start System)
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Measure the voltage and resistance according to the value(s) in the table below.
Tech Tips
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.
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Using an oscilloscope, check the signal waveform of the ECU.
Tech Tips
The oscilloscope waveform shown in the illustration is an example for reference only. Waveforms with noise or chattering are not shown.
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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 Tech Tips
As the duty cycle changes in accordance with the electrical load and battery condition, the output waveform also changes.
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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 Tech Tips
As the duty cycle changes in accordance with the electrical load and battery condition, the output waveform also changes.
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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 Tech Tips
As the duty cycle changes in accordance with the electrical load and battery condition, the output waveform also changes.
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