Toyota Tacoma (2015-2018) Service Manual: Terminals Of Ecu

Toyota Tacoma (2015-2018) Service Manual / 2gr-fks Starting / Smart Key System(for Start Function) / Terminals Of Ecu

TERMINALS OF ECU

1. CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(a) Disconnect the C27 and C29 certification ECU (smart key ECU assembly) connectors.

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

HINT:

Measure the values on the wire harness side with the connector disconnected.

Tester Connection	Input/ Output	Wiring Color	Terminal Description	Condition	Specified Condition	Related Data List Item
C27-12 (STA) - C29-11 (E)	Input	Y - W-B	When starting the engine, this monitors the voltage sent from terminal STAR to the starter relay to judge whether the engine is "being started".	20°C (68°F)	106.78 to 115.98 Ω	-
C27-10 (STAR) - Body ground	Input/ Output	V - Body ground	Outputs voltage to the starter relay Outputs voltage (12 V) to the starter relay when starting the engine. (Max. 30 sec. Turns off when an engine speed of 500 rpm or more continues for 500 ms or more.) HINT: When Hi is selected, a start request signal (STAR) will not be output even though a start request signal (STSW) is input.	Shift lever in any position other than P or N → Shift lever in P or N (at 20°C (68°F))	10 kΩ or higher → 107.05 to 116.33 Ω	-
C27-10 (STAR) - Body ground	Input/ Output	V - Body ground	Receives neutral start switch (P, N position detection) signal Monitors whether the neutral start switch is on (P or N) or off (other than P or N). Applies voltage via a resistor (large) in the certification ECU (smart key ECU assembly). When the neutral start switch is on, due to the starter relay coil resistance (small) using some of the voltage, the voltage at terminal STAR will be low (2.7 V or less), and when the neutral start switch is off, the voltage will be high (9 V or more).	Perform the following operations except while the engine is cranking: Shift lever in any position other than P or N → Shift lever in P or N (at 20°C (68°F))	30 kΩ or higher → 107.05 to 116.33 Ω	Neutral SW/ Clutch SW
C27-14 (NE) - Body ground	Input	BE - Body ground	Engine speed signal	Always	10 kΩ or higher	Engine Conditio n
C27-2 (STP1) - Body ground	Input	L - Body ground	Stop light switch signal	Brake pedal depressed → Brake pedal released	9 V or higher → 1 V or less	Stop Light Switch1
C29-10 (+B) - C29-11 (E)	Input	P - W-B	Power source	Always	11 to 14 V	-
C29-23 (SLP) - C29-11 (E)	Input	BE - W-B	Steering lock position signal	Steering locked	10 kΩ or higher	Steering Unlock Switch
C29-22 (P) - C29-11 (E)	Input	V - W-B	P position signal	Shift lever in P → Shift lever not in P	30 kΩ or higher → Below 200 Ω	Shift P Signal
C29-11 (E) - Body ground	-	W-B - Body ground	GND	Always	Below 1 Ω	-
C29-18 (SSW2) - Body ground	Input	GR - Body ground	SSW2 contact signal HINT: Backup for SSW1. Behaves the same way as SSW1.	Engine switch pushed → Engine switch not pushed	Below 15 Ω → 10 kΩ or higher	Start Switch2
C29-16 (SSW1) - Body ground	Input	BE - Body ground	SSW1 contact signal	Engine switch pushed → Engine switch not pushed	Below 15 Ω → 10 kΩ or higher	Start Switch1
C29-9 (ACCD) - Body ground	Output	R - Body ground	ACC signal	20°C (68°F)	130.92 to 190.74 Ω	ACC Relay Monitor
C27-3 (IG1D) - Body ground	Output	B - Body ground	IG signal	20°C (68°F)	87.32 to 127.14 Ω	IG Relay Monitor (Outside )
C27-4 (CUTB) - C29-11 (E)	Input	GR - W-B	Dark current cut pin*1	Always	11 to 14 V	-
C29-5 (SPD) - Body ground	Input	V - Body ground	Vehicle speed signal	Always	30 kΩ or higher	Vehicle Speed Signal

*1: In order to prevent the vehicle battery from being depleted when the vehicle is shipped long distances, a fuse that cuts unnecessary electrical load while the vehicle is being shipped is set in the circuit. If the fuse is removed, the circuit becomes open. If the fuse that is between the vehicle battery and terminal CUTB is removed and the circuit is open, the certification ECU (smart key ECU assembly) changes to a certain control mode (example: the transmission of electric waves every 0.25 seconds that form the detection area stops).

(d) Measure the voltage and check for pulses according to the value(s) in the table below.

Tester Connection	Input/ Output	Wiring Color	Terminal Description	Condition	Specified Condition	Related Data List Item
C27-12 (STA) - C29-11 (E)	Input	Y - W-B	When starting the engine, this monitors the voltage sent from terminal STAR to the starter relay to judge whether the engine is "being started".	With the brake pedal depressed, the engine switch is pressed and held (starter on) → After approximately 1 second has elapsed, the engine switch is released (starter off)	6 V or higher*1 → 1.0 V or less	-
C27-10 (STAR) - C29-11 (E)	Input/ Output	V - W-B	Outputs voltage to the starter relay Outputs voltage (12 V) to the starter relay when starting the engine. (Max. 30 seconds Turns off when an engine speed of 500 rpm or more continues for 500 ms or more.) HINT: When Hi is selected, a start request signal (STAR) will not be output even though a start request signal (STSW) is input.	With the brake pedal depressed, the engine switch is pressed and held → After approximately 1 second has elapsed, the engine switch is released	6 V or higher*1 → 1.0 V or less	-
C27-10 (STAR) - C29-11 (E)	Input/ Output	V - W-B	Receives neutral start switch (P, N position detection) signal Monitors whether the neutral start switch is on (P or N) or off (other than P or N). Applies voltage via a resistor (large) in the certification ECU (smart key ECU assembly). When the neutral start switch is on, due to the starter relay coil resistance (small) using some of the voltage, the voltage at terminal STAR will be low (2.7 V or less), and when the neutral start switch is off, the voltage will be high (9 V or more).	Perform the following operations except while the engine is cranking: Shift lever in any position other than P or N → Shift lever in P or N (at 20°C (68°F))	9 V or higher → 2.7 V or less	Neutral SW/ Clutch SW
C27-14 (NE) - C29-11 (E)	Input	BE - W-B	Engine speed signal	Idling (engine warmed up)	Pulse generation (See waveform 1)	Engine Conditio n
C27-2 (STP1) - C29-11 (E)	Input	L - W-B	Stop light switch signal	Brake pedal depressed → Brake pedal released	1 V or less → 9 V or higher	Stop Light Switch1
C29-23 (SLP) - C29-11 (E)	Input	BE - W-B	Steering lock position signal	Steering locked → Steering unlocked	11 to 14 V → 1.5 V or less	Steering Unlock Switch
C29-24 (SLR+) - C29-11 (E)	Output	Y - W-B	Steering lock motor operation command signal (Steering lock motor operation permission signal sent from the certification ECU (smart key ECU assembly))	When a door is opened, the steering lock motor will be operated if all of the following conditions are met: The steering is unlocked. The engine switch is off. The shift lever is in P.	Pulse generation (See waveform 2)	-
C29-22 (P) - C29-11 (E)	Input	V - W-B	P position signal	Shift lever in P → Shift lever not in P	9 V or higher → 2.76 V or less	Shift P Signal
C29-18 (SSW2) - C29-11 (E)	Input	GR - W-B	SSW2 contact signal HINT: Backup for SSW1. Behaves the same way as SSW1.	Engine switch not pushed → Engine switch pushed	9 V or higher → 1 V or less	Start Switch2
C29-16 (SSW1) - C29-11 (E)	Input	BE - W-B	SSW1 contact signal	Engine switch not pushed → Engine switch pushed	9 V or higher → 1 V or less	Start Switch1
C29-9 (ACCD) - C29-11 (E)	Output	R - W-B	ACC signal	Engine switch off → Engine switch on (ACC)	1 V or less → 8.5 V or higher	ACC Relay Monitor
C27-3 (IG1D) - C29-11 (E)	Output	B - W-B	IG signal	Engine switch on (ACC) → Engine switch on (IG)	1 V or less → 9 V or higher	IG Relay Monitor (Outside )
C29-5 (SPD) - C29-11 (E)	Input	V - W-B	Vehicle speed signal	Vehicle being driven at approximately 5 km/h (3 mph)	Pulse generation (See waveform 3)	ACC Relay Monitor

*1: While the engine is cranking, the battery voltage may drop to approximately 6 V.

HINT:

The waveform of the steering lock actuator motor stopped can be checked without performing any particular operation.
The waveform of the steering lock actuator motor operating can be checked if either of the following operations is performed:
- To unlock the steering, bring the electrical key transmitter sub-assembly into the cabin and turn the engine switch on (ACC) or on (IG).
- To lock the steering, open a door with the engine switch off and the shift lever in P.

(e) Using an oscilloscope, check the waveform of the ECU.

NOTICE:

The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

(1) Waveform 1

Item	Content
Tester Connection	C27-14 (NE) - C29-11 (E)
Tool Setting	2 V/DIV., 2 ms./DIV.
Condition	Idling (engine warmed up)

HINT:

The wavelength becomes shorter as the engine speed increases.

(2) Waveform 2

Item	Content
Tester Connection	C29-24 (SLR+) - C29-11 (E)
Tool Setting	2 V/DIV., 200 ms./DIV.
Condition	Steering lock motor stopped → Steering lock motor operating → Steering lock motor stopped

Text in Illustration

*a	Steering lock motor not operating
*b	Steering lock motor operating

(3) Waveform 3

Item	Content
Tester Connection	C29-5 (SPD) - C29-11 (E)
Tool Setting	5 V/DIV., 200 ms./DIV.
Condition	Vehicle being driven at approx. 5 km/h (3 mph)

HINT:

The wavelength becomes shorter as the engine speed increases.

2. CHECK STEERING LOCK ECU (STEERING LOCK ACTUATOR OR UPR BRACKET ASSEMBLY)

See page 3. CHECK ENGINE SWITCH

3. CHECK ENGINE SWITCH

See page Data List / Active Test

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