Terminals Of Ecu [12/2019 - 10/2022]

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

HINT: 

As a waterproof connector is used for the ECM, voltage, resistance and waveform inspections cannot be performed. The voltage, resistance and waveform values are provided for reference only.

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

   Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
   A28-27 (STP) - C54-53 (E1)	Stop light switch assembly signal	Brake pedal depressed	11 to 14 V
   		Brake pedal released	Below 1 V
   A28-41 (CCS) - C54-53 (E1)	Steering pad switch circuit	Cruise control switch not pushed	1 MΩ or higher
   		Cruise control main switch pushed	Below 2.5 Ω
   		CANCEL switch pushed	228 to 252 Ω
   		+RES switch pushed	599 to 661 Ω
   		-SET switch pushed	1463 to 1617 Ω
   A28-42 (ST1-) - C54-53 (E1)	Stop light switch assembly signal	Ignition switch ON, brake pedal depressed	Below 1 V
   		Ignition switch ON, brake pedal released	11 to 14 V

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
   R5-3 (LKSW) - R5-10 (GND)	Steering pad switch assembly signal (distance control signal)	Ignition switch ON, vehicle-to-vehicle distance control switch on	Below 1 V
   		Ignition switch ON, vehicle-to-vehicle distance control switch off	4.75 to 5.25 V
   R5-7 (IGB) - R5-10 (GND)	Power source	Ignition switch ON	11 to 14 V
   		Ignition switch off	Below 1 V
   R5-10 (GND) - Body ground	Ground	Always	Below 1 Ω

2. Check for pulses according to the value(s) in the table below.

   HINT: 

   If the waveform is not similar to that shown in the illustration, a malfunction of a CAN bus line, terminating resistor, or the forward recognition camera is suspected.

   Terminal No. (Symbol)	Terminal Description	Condition	Specified Condition
   R5-5 (CA1P) - R5-10 (GND)	CAN communication signal	Ignition switch ON	Pulse generation (See waveform 1)
   R5-6 (CANH) - R5-10 (GND)	CAN communication signal	Ignition switch ON	Pulse generation (See waveform 1)
   R5-11 (CA1N) - R5-10 (GND)	CAN communication signal	Ignition switch ON	Pulse generation (See waveform 2)
   R5-12 (CANL) - R5-10 (GND)	CAN communication signal	Ignition switch ON	Pulse generation (See waveform 2)

   1. Waveform 1

      Item	Content
      Tester Connection	Between R5-5 (CA1P) and R5-10 (GND) Between R5-6 (CANH) and R5-10 (GND)
      Tool Setting	1 V/DIV., 10 μs./DIV.
      Condition	Ignition switch ON

      HINT: 

      The waveform varies depending on the CAN communication signal.

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   2. Waveform 2

      Item	Content
      Tester Connection	Between R5-11 (CA1N) and R5-10 (GND) Between R5-12 (CANL) and R5-10 (GND)
      Tool Setting	1 V/DIV., 10 μs./DIV.
      Condition	Ignition switch ON

      HINT: 

      The waveform varies depending on the CAN communication signal.

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002