Terminals Of Ecu

1. CHECK NO. 1 METER ECU 
   Fig 1: Identifying No. 1 Meter ECU Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Measure the resistance and voltage according to the value(s) in the table below.
      TERMINAL DESCRIPTION TABLE
      
      

      Terminal No. (Symbols)	Wiring Color	Terminal Description	Condition	Specified Condition
      L10-1 (B) - Body ground	G - Body ground	Turn signal L	Engine switch on (IG), turn signal LH indicator light OFF	Below 1 V
      			Engine switch on (IG), turn signal LH indicator light ON	Alternating between below 1 and 11 to 14 V
      L10-2 (PBLT) - Body ground	SB - Body ground	Seat belt condition signal (Passenger side)	Passenger seat belt indicator is OFF	Below 1 V
      			Passenger seat belt indicator blinks	Alternating between below 1 and 11 to 14 V
      L10-4 (A/B) - Body ground	B - Body ground	ODO/TRIP signal	Engine switch on (IG), ODO/TRIP switch ON	Below 1 V
      			Engine switch on (IG), ODO/TRIP switch OFF	4.4 to 5.5 V
      L10-5 (RSET) - Body ground	BR - Body ground	TRIP RESET signal	Engine switch on (IG), TRIP RESET switch ON	Below 1 V
      			Engine switch on (IG), TRIP RESET switch OFF	4.4 to 5.5 V
      L10-7 (RHDW) - Body ground	L - Body ground	Light control rheostat DOWN signal	Engine switch on (IG), Light control rheostat DOWN switch ON	Below 1 V
      			Engine switch on (IG), Light control rheostat DOWN switch OFF	4.4 to 5.5 V
      L10-8 (RHUP) - Body ground	R - Body ground	Light control rheostat UP signal	Engine switch on (IG), Light control rheostat UP switch ON	Below 1 V
      			Engine switch on (IG), Light control rheostat UP switch OFF	4.4 to 5.5 V
      L10-9 (SI) - Body ground	L - Body ground	Speed signal (Input)	Engine switch on (IG) and turn the wheel slowly	Pulse generation (See waveform)
      L10-10 (+S) - Body ground	V - Body ground	Speed signal (Output)	Engine switch on (IG) and turn the wheel slowly	Pulse generation (See waveform)
      L10-11 (EFI) - Body ground	R - Body ground	MIL	MIL ON	Below 1 to 4.2 V
      			MIL OFF	11 to 14 V
      L10-12 (B) - Body ground	Y - Body ground	Turn signal R	Engine switch on (IG), turn signal RH indicator light OFF	Below 1 V
      			Engine switch on (IG), turn signal RH indicator light ON	Alternating between below 1 and 11 to 14 V
      L10-13 (B) - Body ground	B - Body ground	Battery	Always	11 to 14 V
      L10-14 (IG2) - Body ground	L - Body ground	Engine switch signal	Engine switch off	Below 1 V
      			Engine switch on (IG)	11 to 14 V
      L10-16 (ILL-) - Body ground	LG - Body ground	Illumination signal	Engine switch on (IG)	Pulse generation
      L10-17 (E2) - Body ground	W-B - Body ground	Ground (Power ground)	Always	Below 1 Ω
      L10-18 (ES) - Body ground	BR - Body ground	Ground	Always	Below 1 Ω
      L10-24 (EPB*) - Body ground	L - Body ground	Brake fluid level warning light signal	Engine switch on (IG), BRAKE warning light ON	Below 1 V
      			Engine switch on (IG), BRAKE warning light OFF	Pulse generation
      HINT: *: Stands for electric parking brake If the result is not as specified, the meter may have a malfunction.

   2. Using an oscilloscope, check the waveform.

      Waveform (Reference): 

      WAVEFORM REFERENCE TABLE
      
      

      Item	Condition
      Terminal No. (Symbols)	L10-10 (+S) - Body ground L10-9 (SI) - Body ground
      Tool setting	5 V/DIV., 20 msec./DIV.
      Vehicle condition	Driving at approx. 20 km/h (12 mph)

      HINT:

      As vehicle speed increases, the cycle of the signal waveform narrows.

      Fig 2: Identifying Waveform Graph

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. CHECK NO. 1 METER ECU INNER CIRCUIT 
   Fig 3: Identifying No. 1 Meter ECU Inner Circuit Diagram (1 Of 4)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 4: Identifying No. 1 Meter ECU Inner Circuit Diagram (2 Of 4)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 5: Identifying No. 1 Meter ECU Inner Circuit Diagram (3 Of 4)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 6: Identifying No. 1 Meter ECU Inner Circuit Diagram (4 Of 4)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

This diagram shows all the indicators that are provided, which may differ from the actual vehicle.