Terminals Of Ecu

CHECK COMBINATION METER ASSEMBLY

Fig 1: Combination Meter F1 And F2 Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the F1 combination meter assembly connector.

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

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.

Reconnect the F1 combination meter assembly connector.

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
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 waveform 1)
F1-18 (SI) - Body ground	P - Body ground	Vehicle speed signal (Input)	Ignition switch ON, Slowly turn wheel	Pulse generation (See waveform 1)
F1-19 (WLVL) - 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	BE - 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
F2-1 (TIRE) - Body ground	BE - Body ground	Tire pressure warning light signal	Ignition switch ON, Tire pressure warning light ON	0.9 to 3.2 V
F2-1 (TIRE) - Body ground	BE - Body ground	Tire pressure warning light signal	Ignition switch ON, Tire pressure warning light OFF	3.2 V or higher
F2-6 (ILL-) - Body ground	GR - Body ground	Light control rheostat signal	Ignition switch OFF → ON	Pulse generation (See waveform 2)
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
F2-8 (TC) - Body ground	Y - Body ground	Tail cancel switch signal	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
F2-9 (L) - Body ground	V - Body ground	Fuel signal	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

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

Waveform 1: Using an oscilloscope

Fig 2: Identifying Waveform 1

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Terminal Connections	F1-18 (SI) - Body ground F1-17 (+S) - Body ground
Tester Range	5 V/DIV, 20 msec/DIV
Vehicle Condition	Driving at approximately 20 km/h (12 mph)

HINT:

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

Waveform 2: Using an oscilloscope

Fig 3: Identifying Waveform 2

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

CHECK MAIN BODY ECU

Fig 4: Rear View Of Main Body ECU

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

TEXT IN ILLUSTRATION

Rear view of Main Body ECU

Fig 5: Front View Of Main Body ECU

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

TEXT IN ILLUSTRATION

Front view of Main Body ECU

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
4A-5 (RRCY) - 4E-17 (GND1)	G - W-B	Rear door courtesy light switch signal (LH)	Rear door (LH) CLOSED → OPEN	11 to 14 V → Below 1 V
4A-7 (BCTY) - 4E-17 (GND1)	SB - W-B	Back door courtesy light switch signal	Back door CLOSED → OPEN	11 to 14 V → Below 1 V
4A-20 (RRCY) - 4E-17 (GND1)	L - W-B	Rear door courtesy light switch signal (RH)	Rear door (RH) CLOSED → OPEN	11 to 14 V → Below 1 V
4A-21 (DCTY) - 4E-17 (GND1)	R - W-B	Front door courtesy light switch signal (Driver side)	Front door (Driver side) CLOSED → OPEN	11 to 14 V → Below 1 V
4A-24 (PCTY) - 4E-17 (GND1)	L - W-B	Front door courtesy light switch signal (Passenger side)	Front door (Passenger side) CLOSED → OPEN	11 to 14 V → Below 1 V
4C-2 (PKB) - 4E-17 (GND1)	Y - W-B	Parking brake signal	Parking brake warning light ON → OFF	11 to 14 V → Below 1 V
4D-7 (KSW) - 4E-17 (GND1)	Y - W-B	Key switch condition signal	Key inserted → Removed	11 to 14 V → Below 1 V
4E-17 (GND1) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
F38-22 (CANL) - Body ground	W - Body ground	CAN communication line	Ignition switch ON	Pulse generation
F38-23 (CANH) - Body ground	R - Body ground	CAN communication line	Ignition switch ON	Pulse generation

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

Fig 6: Meter / Gauge Schematic (1 Of 3)

Fig 7: Meter / Gauge Schematic (2 Of 3)

Fig 8: Meter / Gauge Schematic (3 Of 3)

CONNECTORS

Terminal No. (Symbol)		Wire Harness Side
F1	1	Ignition switch
	2	Battery
	5	Engine oil pressure switch
	6	Generator (Alternator)
	7	Brake fluid level warning switch
	8	Headlight dimmer switch
	9	ECM
	10	Battery
	13	Body ground
	16	Turn signal flasher relay
	17	ECM (4P-OUT)
	18	Skid control ECU
	19	Washer level warning switch
	21	Battery
	23	Front passenger seat belt warning light
F2	1	Tire pressure warning ECU
	6	Light control rheostat
	7	T-LP relay
	8	Light control rheostat
	9	Fuel sender gauge assembly
	11	Turn signal flasher relay
	15	CAN communication line
	16	CAN communication line