Terminals Of Ecu

1. CHECK COMBINATION METER ASSEMBLY (METER ECU) 
   Fig 1: Identifying Combination Meter Assembly Connector Terminals (Meter ECU)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. Disconnect the F1 combination meter assembly connector.
   2. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      STANDARD VOLTAGE SPECIFICATIONS
      
      

      Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
      F1-1 (IG2) - Body ground	B - Body ground	Ignition switch signal	Ignition switch OFF → ON	Below 1 V → 11 to 14 V
      F1-2 (ECUB) - Body ground	L - Body ground	Battery	Always	11 to 14 V
      F1-13 (ET) - Body ground	BR - Body ground	Ground	Always	Below 1 V

      If the result is not as specified, there may be a malfunction on the wire harness side.

   3. Reconnect the F1 combination meter assembly connector.
   4. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      STANDARD VOLTAGE SPECIFICATIONS
      
      

      Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
      F2-1 (TIRE) - Body ground	O - Body ground	Tire pressure warning light signal	Ignition switch on, Tire pressure warning light ON	0 9 to 3 2 V
      			Ignition switch on, Tire pressure warning light OFF	3 2 V or higher
      F2-2 (IND) - Body ground	G - Body ground	Taillight indicator signal	Headlight dimmer switch (TAIL) OFF → ON	Below 1 V → 11 to 14 V
      F2-6 (ILL-) - Body ground	GR - Body ground	Light control rheostat signal	Ignition switch OFF → ON	Pulse generation (See  1 waveform 1)
      F2-7 (ILL+) - Body ground	G - Body ground	Tail switch signal	Tail switch OFF → ON	Below 1 V → 11 to 14 V
      F2-8 (TC) - Body ground	Y - Body ground	Tail cancel switch signal	Ignition switch on, tail cancel switch OFF	4 to 6 V
      			Ignition switch on, tail cancel switch ON	Below 1 V
      F2-9 (L) - Body ground	V - Body ground	Fuel signal	Ignition switch on, Fuel level is FULL	Below 1 V
      			Ignition switch on, Fuel level is EMPTY	3 to 7 V
      F2-11 (B) - Body ground	LG - Body ground	Left turn signal	Left turn indicator light OFF → ON	Below 1 V → 11 to 14 V
      F2-15 (CANH) - Body ground	G - Body ground	CAN communication line	Ignition switch on	Pulse generation
      F2-16 (CANL) - Body ground	W - Body ground	CAN communication line	Ignition switch on	Pulse generation
      F1-5 (S) - Body ground	Y - Body ground	Engine oil pressure signal	Engine oil pressure signal OFF → ON	Below 1 V → 11 to 14 V
      F1-6 (CHG-) - Body ground	L - Body ground	Charge warning light signal	Engine start, Charge warning light OFF → ON	Below 1 V → 11 to 14 V
      F1-7 (SW) - Body ground	V - Body ground	Brake fluid level warning light signal	Ignition switch on, Brake fluid level warning light OFF → ON	Below 1 V → 11 to 14 V
      F1-8 (HEAD) - Body ground	L - Body ground	Headlight indicator signal	Headlight dimmer switch (HEAD) OFF → ON	Below 1 V → 11 to 14 V
      F1-9 (EFI) - Body ground	B - Body ground	Check engine warning light signal	Check engine warning light OFF → ON	Below 1 V → 11 to 14 V
      F1-10 (-) - Body ground	P - Body ground	Hi beam signal	BEAM indicator light signal OFF → ON	Below 1 V → 11 to 14 V
      F1-16 (B) - Body ground	BR - Body ground	Right turn signal	Right turn indicator light OFF → ON	Below 1 V → 11 to 14 V
      F1-17 (+S) - Body ground	SB - Body ground	Vehicle speed signal (Output)	Vehicle is driven	Pulse generation (See  2 waveform 2)
      F1-18 (SI) - Body ground	P - Body ground	Vehicle speed signal (Input)	Ignition switch on, Slowly turn wheel	Pulse generation (See  2 waveform 2)
      F1-19 (WVLV) - Body ground	W - Body ground	Washer level warning signal	Washer level warning light OFF → ON	Below 1 V → 11 to 14 V
      F1-21 (+) - Body ground	GR - Body ground	Hi beam signal	BEAM indicator light signal OFF → ON	Below 1 V → 11 to 14 V
      F1-23 (PBLT) - Body ground	O - Body ground	Seat belt warning signal (Passenger side)	Ignition switch on, Front passenger seat belt warning light OFF → ON → OFF	Below 1 V → 11 to 14 V → Below 1 V

      If the result is not as specified, the combination meter may be malfunctioning.

      1. Waveform 1: Using an oscilloscope
         WAVEFORM 1 REFERENCE GRAPH
         
         

         Terminal Connections	F2-6 (ILL-) - Body Ground
         Tester Range	5V/DIV, 50msec/DIV
         Vehicle Condition	Ignition switch on

         Fig 2: Oscilloscope Waveform 1 Graph

         Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Waveform 2: Using an oscilloscope
         WAVEFORM 2 REFERENCE GRAPH
         
         

         Terminal Connections	F1-18 (SI) - Body ground F1-27 (+S) - Body ground
         Tester Range	5V/DIV, 20msec/DIV
         Vehicle Condition	Driving at approximately 20km/h (12mph)

         HINT:

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

         Fig 3: Oscilloscope Waveform 2 Graph

         Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. CHECK MAIN BODY ECU 
   Fig 4: Identifying Main Body ECU Connectors Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 5: Identifying Main Body ECU Connectors Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard voltage 

If the result is not as specified, there may be a malfunction in the wire harness.

Fig 6: Meter/Gauge System Circuit Diagram (1 Of 3)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 7: Meter/Gauge System Circuit Diagram (2 Of 3)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 8: Meter/Gauge System Circuit Diagram (3 Of 3)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Table of terminal connection