Toyota 4Runner: Terminals Of Ecu

Toyota 4Runner Service Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Engine Immobiliser System(w/ Smart Key System) / Terminals Of Ecu

TERMINALS OF ECU

1. CHECK ENGINE SWITCH

(a) Disconnect the F71 switch connector.

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
F71-8 (AGND) - Body ground	GR - Body ground	Ground	Always	Below 1 Ω
F71-5 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

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

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
F71-9 (TXCT) - F71-8 (AGND)	W - GR	Key code output signal	Engine switch off, 30 seconds or more after door opened or closed and brake pedal not depressed	Below 1 V
F71-9 (TXCT) - F71-8 (AGND)	W - GR	Key code output signal	Engine switch off, key not in cabin and 30 seconds or less after engine switch pushed	Pulse generation (see waveform 1)
F71-10 (CODE) - F71-8 (AGND)	V - GR	Demodulated signal of key code data	Engine switch off, 30 seconds or more after door opened or closed and brake pedal not depressed	Below 1 V
F71-10 (CODE) - F71-8 (AGND)	V - GR	Demodulated signal of key code data	Engine switch off, key held against engine switch and engine switch pushed*	Pulse generation (see waveform 2)
F71-11 (SWIL) - F71-5 (GND)	SB - W-B	Illumination signal	Engine switch off, light control rheostat fully turned upward and Light control switch off → tail	Below 2 V → 9 to 14 V
F71-14 (VC5) - F71-8 (AGND)	P - GR	Power supply	Engine switch off, 30 seconds or more after door opened or closed and brake pedal not depressed	Below 1 V
F71-14 (VC5) - F71-8 (AGND)	P - GR	Power supply	Engine switch off, key not in cabin and 30 seconds or less after engine switch pushed	Pulse generation (see waveform 3)

HINT:

*: Remove the key battery before performing this inspection.

If the result is not as specified, the engine switch may have a malfunction.

(e) Inspect using an oscilloscope.

(1) Waveform 1 (Reference)

Measurement Condition

Item	Content
Tester Connection	F71-9 (TXCT) - F71-8 (AGND)
Tool Setting	2 V/DIV., 20 ms./DIV.
Condition	Engine switch off, key not in cabin and 30 seconds or less after engine switch pushed

(2) Waveform 2 (Reference)

Measurement Condition

Item	Content
Tester Connection	F71-10 (CODE) - F71-8 (AGND)
Tool Setting	2 V/DIV., 20 ms./DIV.
Condition	Engine switch off, key held against engine switch and engine switch pushed*

HINT:

*: Remove the key battery before performing this inspection.

(3) Waveform 3 (Reference)

Measurement Condition

Item	Content
Tester Connection	F71-14 (VC5) - F71-8 (AGND)
Tool Setting	2 V/DIV., 20 ms./DIV.
Condition	Engine switch off, key not in cabin and 30 seconds or less after engine switch pushed

2. CHECK CERTIFICATION ECU

(a) Disconnect the F79 ECU connector.

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
F79-1 (+B) - F79-15 (E)	V - W-B	+B power supply	Always	11 to 14 V
F79-17 (CUTB) - F79-15 (E)	L - W-B	+B power supply	Always	11 to 14 V
F79-16 (IG) - F79-15 (E)	W - W-B	Ignition power supply	Engine switch off → on (IG)	Below 1 V → 11 to 14 V
F79-15 (E) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

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

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
F79-2 (IND) - F79-15 (E)	L - W-B	Security indicator output	Engine switch off → on (IG)	Pulse generation → Below 2 V
F79-11 (SWIL) - F79-36 (AGND)	SB - GR	Illumination signal	Engine switch off, light control rheostat fully turned upward and Light control switch off	Below 2 V
F79-11 (SWIL) - F79-36 (AGND)	SB - GR	Illumination signal	Engine switch off, light control rheostat fully turned upward and Light control switch tail	9 to 14 V
F79-12 (TXCT) - F79-36 (AGND)	W - GR	Engine switch TXCT output	Engine switch off, 30 seconds or more after door opened or closed and brake pedal not depressed	Below 1 V
F79-12 (TXCT) - F79-36 (AGND)	W - GR	Engine switch TXCT output	Engine switch off, key not in cabin and 30 seconds or less after engine switch pushed	Pulse generation (see waveform 1)
F79-13 (CODE) - F79-36 (AGND)	V - GR	Engine switch CODE input	Engine switch off, 30 seconds or more after door opened or closed and brake pedal not depressed	Below 1 V
F79-13 (CODE) - F79-36 (AGND)	V - GR	Engine switch CODE input	Engine switch off, key held against engine switch and engine switch pushed*	Pulse generation (see waveform 2)
F79-28 (VC5) - F79-36 (AGND)	P - GR	Engine switch power supply	Engine switch off, 30 seconds or more after door opened or closed and brake pedal not depressed	Below 1 V
F79-28 (VC5) - F79-36 (AGND)	P - GR	Engine switch power supply	Engine switch off, key not in cabin and 30 seconds or less after engine switch pushed	Pulse generation (see waveform 3)
F79-36 (AGND) - Body ground	GR - Body ground	Engine switch ground	Always	Below 1 Ω

HINT:

*: Remove the key battery before performing this inspection.

If the result is not as specified, the certification ECU may have a malfunction.

(e) Inspect using an oscilloscope.

(1) Waveform 1 (Reference)

Measurement Condition

Item	Content
Tester Connection	F79-12 (TXCT) - F79-36 (AGND)
Tool Setting	2 V/DIV., 20 ms./DIV.
Condition	Engine switch off, key not in cabin and 30 seconds or less after engine switch pushed

(2) Waveform 2 (Reference)

Measurement Condition

Item	Content
Tester Connection	F79-13 (CODE) - F79-36 (AGND)
Tool Setting	2 V/DIV., 20 ms./DIV.
Condition	Engine switch off, key held against engine switch and engine switch pushed*

HINT:

*: Remove the key battery before performing this inspection.

(3) Waveform 3 (Reference)

Measurement Condition

Item	Content
Tester Connection	F79-28 (VC5) - F79-36 (AGND)
Tool Setting	2 V/DIV., 20 ms./DIV.
Condition	Engine switch off, key not in cabin and 30 seconds or less after engine switch pushed

3. CHECK ID CODE BOX

(a) Disconnect the F72 box connector.

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
F72-1 (+B) - F72-8 (GND)	V - W-B	+B power supply	Always	11 to 14 V
F72-8 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

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

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
F72-5 (EFII) - F72-8 (GND)	SB - W-B	ECM input signal	Within 3 seconds after starter operates and initial combustion occurs, or within 3 seconds after engine switch first turned on (IG) after battery disconnected and connected	11 to 14 V → Pulse generation (see waveform 1)
F72-6 (EFIO) - F72-8 (GND)	W - W-B	ECM output signal	Engine switch off → on (IG)	11 to 14 V → Pulse generation (see waveform 2)

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

F72-5 (EFII) - F72-8 (GND)

SB - W-B

ECM input signal

Within 3 seconds after starter operates and initial combustion occurs, or within 3 seconds after engine switch first turned on (IG) after battery disconnected and connected

11 to 14 V → Pulse generation

(see waveform 1)

F72-6 (EFIO) - F72-8 (GND)

W - W-B

ECM output signal

Engine switch off → on (IG)

11 to 14 V → Pulse generation

(see waveform 2)

If the result is not as specified, the ID code box may have a malfunction.

(e) Inspect using an oscilloscope.

(1) Waveform 1 (Reference)

Measurement Condition

Item	Content
Tester Connection	F72-5 (EFII) - F72-8 (GND)
Tool Setting	5 V/DIV., 500 ms./DIV.
Condition	Within 3 seconds after starter operates and initial combustion occurs, or within 3 seconds after engine switch first turned on (IG) after battery disconnected and connected

(2) Waveform 2 (Reference)

Measurement Condition

Item	Content
Tester Connection	F72-6 (EFIO) - F72-8 (GND)
Tool Setting	10 V/DIV., 100 ms./DIV.
Condition	Engine switch on (IG)

4. CHECK STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)

(a) Disconnect the F68 ECU connector.

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
F68-1 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
F68-6 (IG2) - F68-1 (GND)	W - W-B	IG2 signal input	Engine switch off → on (IG)	Below 1 V → 11 to 14 V
F68-7 (B) - Body ground	GR - Body ground	Power source	Always	11 to 14 V

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

5. CHECK POWER MANAGEMENT CONTROL ECU

(a) Disconnect the F80 ECU connector.

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
F80-1 (AM22) - Body ground	B - Body ground	Battery power	Always	11 to 14 V
F80-2 (AM21) - Body ground	B - Body ground	Battery power	Always	11 to 14 V
F80-5 (GND2) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω
F80-6 (GND) - Body ground	W-B - Body ground	Ground	Always	Below 1 Ω

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

6. CHECK ECM

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

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
F50-20 (IMO) - Body ground	SB - Body ground	Transponder key ECU output signal	Within 3 seconds after starter operates and initial combustion occurs, or within 3 seconds after engine switch first turned on (IG) after battery disconnected and connected	11 to 14 V → Pulse generation (see waveform 1)
F50-14 (IMI) - Body ground	W - Body ground	Transponder key ECU input signal	Engine switch off → on (IG)	11 to 14 V → Pulse generation (see waveform 2)

Terminal No. (Symbol)

Wiring Color

Terminal Description

Condition

Specified Condition

F50-20 (IMO) - Body ground

SB - Body ground

Transponder key ECU output signal

Within 3 seconds after starter operates and initial combustion occurs, or within 3 seconds after engine switch first turned on (IG) after battery disconnected and connected

11 to 14 V → Pulse generation

(see waveform 1)

F50-14 (IMI) - Body ground

W - Body ground

Transponder key ECU input signal

Engine switch off → on (IG)

11 to 14 V → Pulse generation

(see waveform 2)

If the result is not as specified, the ECM may have a malfunction.

(b) Inspect using an oscilloscope.

(1) Waveform 1 (Reference)

Measurement Condition

Item	Content
Tester Connection	F50-20 (IMO) - Body ground
Tool Setting	5 V/DIV., 500 ms./DIV.
Condition	Within 3 seconds after starter operates and initial combustion occurs, or within 3 seconds after engine switch first turned on (IG) after battery disconnected and connected

(2) Waveform 2 (Reference)

Measurement Condition

Item	Content
Tester Connection	F50-14 (IMI) - Body ground
Tool Setting	10 V/DIV., 100 ms./DIV.
Condition	Engine switch on (IG)

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