Terminals Of Ecu [08/2015 - 08/2019]

HINT:

For the layout of the certification ECU terminals, refer to the following (Refer to TERMINALS OF ECU [08/2015 - 08/2019] ).
For the layout of the ID code box terminals, refer to the following (Refer to TERMINALS OF ECU [08/2015 - 08/2019] ).
For the layout of the steering lock ECU terminals, refer to the following (Refer to TERMINALS OF ECU [08/2015 - 08/2019] ).

CHECK POWER MANAGEMENT CONTROL ECU

Fig 1: G38 and G39 Connector End View

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the G38 and G39 connectors.

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

Terminal No. (Symbol)	Input/Output	Wiring Color	Terminal Description	Condition	Specified Condition	Related Data List Item
G38-2 (STA) - Body ground	Input	W - Body ground	Determines whether engine is being started by monitoring starter relay activation voltage from terminal STAR during engine start	20°C (68°F)	93.8 to 136.4 Ω	-
G38-3 (STAR) - Body ground	Output	B - Body ground	Starter relay activation output Outputs starter relay activation voltage (12 V) when engine is being started. Outputs for maximum of 30 seconds. Turns off when engine speed is 500 rpm or more for 500 milliseconds or more. When engine switch is on (IG), monitors whether park/neutral position switch is on (shift lever in P or N) or off (shift lever not in P or N). Outputs 12 V through large resistance in ECM. When park/neutral position switch is on, terminal STAR voltage is low (approximately 0.5 V) due to voltage division with starter relay coil resistance (small). When park/neutral position switch is off, terminal STAR voltage is high (approximately 10.5 V). HINT: When voltage is high, start signal (STAR) is not output even if start command signal (STSW) is input.	Shift lever not in P or N → Shift lever in P or N (20°C [68°F])	10 kΩ or higher → 93.8 to 136.4 Ω	- Neutral SW/ Clutch SW
G38-4 (NE) - Body ground	Input	P - Body ground	Engine speed signal	Always	10 kΩ or higher	Engine Condition
G38-8 (IG2D) - Body ground	Output	L - Body ground	IG2 signal	20°C (68°F)	131 to 387 Ω	IG2 Relay Monitor(Outside)
G38-11 (STP1) - Body ground	Input	V - Body ground	Stop light switch signal	Brake pedal depressed → Brake pedal released	9 V or higher → 1 V or less	Stop Light Switch1
G39-1 (AM22) - Body ground	Input	B - Body ground	+B power supply	Always	9.5 to 14 V	-
G39-2 (AM21) - Body ground	Input	B - Body ground	+B power supply	Always	9.5 to 14 V	-
G39-3 (SLP) - Body ground	Input	SB - Body ground	Steering lock bar position signal	Always	10 kΩ or higher	Steering Unlock Switch
G39-5 (GND2) - Body ground	-	W-B - Body ground	Ground	Always	Below 1 Ω	-
G39-6 (GND) - Body ground	-	W-B - Body ground	Ground	Always	Below 1 Ω	-
G39-11 (CA3N) - Body ground	Input/Output	W - Body ground	CAN communication line	Always	10 kΩ or higher	-
G39-12 (CA3P) - Body ground	Input/Output	BR - Body ground	CAN communication line	Always	10 kΩ or higher	-
G39-13 (CA1L) - Body ground	Input/Output	W - Body ground	CAN communication line	Always	10 kΩ or higher	-
G39-14 (CA1H) - Body ground	Input/Output	BR - Body ground	CAN communication line	Always	10 kΩ or higher	-
G39-17 (SSW2) - Body ground	Input	R - Body ground	SSW2 contact signal (backup for SSW1 and has same behavior as SSW1) HINT: Backup for SSW1. Behaves the same way as SSW1.	Engine switch pushed → Engine switch not pushed	Below 1 Ω → 10 kΩ or higher	Start Switch2
G39-18 (SSW1) - Body ground	Input	LG - Body ground	SSW1 contact signal	Engine switch pushed → Engine switch not pushed	Below 1 Ω → 10 kΩ or higher	Start Switch1
G39-20 (IG1D) - Body ground	Output	V - Body ground	IG1 signal	20°C (68°F)	50.63 to 123.75 Ω	IG1 Relay Monitor(Outside)
G39-24 (LIN2) - Body ground	Input/Output	G - Body ground	LIN communication line	Always	10 kΩ or higher	-
G39-25 (CA2L) - Body ground	Input/Output	W - Body ground	CAN communication line	Always	10 kΩ or higher	-
G39-26 (CA2H) - Body ground	Input/Output	V - Body ground	CAN communication line	Always	10 kΩ or higher	-

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

Reconnect the G38 and G39 connectors.

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

Terminal No. (Symbol)	Input/Output	Wiring Color	Terminal Description	Condition	Specified Condition	Related Data List Item
G38-2 (STA) - G39-6 (GND)	Input	W - W-B	Determines whether engine is being started by monitoring starter relay activation voltage from terminal STAR during engine start	With brake pedal depressed, engine switch pressed and held for approx. 1 sec. (starter on) → Engine switch released (starter off)	6 V or higher*2 → 1.5 V or less	-
G38-3 (STAR) - G39-6 (GND)	Output	B - W-B	Starter relay activation output Outputs starter relay activation voltage (12 V) when engine is being started. Outputs for maximum of 30 seconds. Turns off when engine speed is 500 rpm or more for 500 milliseconds or more. When engine switch is on (IG), monitors whether park/neutral position switch is on (shift lever in P or N) or off (shift lever not in P or N). Outputs 12 V through large resistance in ECM. When park/neutral position switch is on, terminal STAR voltage is low (approximately 0.5 V) due to voltage division with starter relay coil resistance (small). When park/neutral position switch is off, terminal STAR voltage is high (approximately 10.5 V). HINT: When voltage is high, start signal (STAR) is not output even if start command signal (STSW) is input.	With brake pedal depressed, engine switch pressed and held for approx. 1 sec. (starter on) → Engine switch released (starter off)	6 V or higher*2 → 1.8 V or less	- Neutral SW/ Clutch SW
G38-4 (NE) - G39-6 (GND)	Input	P - W-B	Crankshaft position sensor signal	Idling with warm engine	Pulse generation (See waveform 1)	Engine Condition
G38-8 (IG2D) - G39-6 (GND)	Output	L - W-B	IG2 signal	Engine switch on (ACC) → Engine switch on (IG)	1 V or less → 9 V or higher	IG2 Relay Monitor(Outside)
G38-11 (STP1) - G39-6 (GND)	Input	V - W-B	Stop light switch signal	Brake pedal released → Brake pedal depressed	1 V or less → 8.5 V or higher	Stop Light Switch1
G39-3 (SLP) - G39-6 (GND)	Input	SB - W-B	Steering lock bar position signal	Steering locked → Steering unlocked*1	9 V or higher → 1.2 V or less	Steering Unlock Switch
G39-8 (SLR+) - G39-6 (GND)	Output	W - W-B	Steering lock motor activation command signal (motor activation permission signal sent from power management ECU)	Steering lock motor operating → Steering lock motor not operating → Steering lock motor operating*3	Pulse generation (See waveform 2)	-
G39-10 (INDW) - G39-6 (GND)	Output	L - W-B	Engine switch indicator (amber) illumination output	Brake pedal released, shift lever in P, engine switch on (ACC), or on (IG) → Other than previous condition	7 V or higher → 1 V or less	-
G39-16 (P) - G39-6 (GND)	Input	V - W-B	Shift lever P position switch signal	Shift lever in P → Shift lever not in P	9 V or higher → 1.5 V or less HINT: Pulse generation (See waveform 3)	Shift P Signal
G39-17 (SSW2) - G39-6 (GND)	Input	R - W-B	SSW2 contact signal (backup for SSW1 and has same behavior as SSW1) 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
G39-18 (SSW1) - G39-6 (GND)	Input	LG - W-B	Engine switch signal	Engine switch not pushed → Engine switch pushed	9 V or higher → 1 V or less	Start Switch1
G39-19 (ACCD) - G39-6 (GND)	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
G39-20 (IG1D) - G39-6 (GND)	Output	V - W-B	IG1 signal	Engine switch on (ACC) → Engine switch on (IG)	1 V or less → 9 V or higher	IG1 Relay Monitor(Outside)
G39-22 (INDS) - G39-6 (GND)	Output	B - W-B	Engine switch indicator (green) illumination output	Brake pedal depressed, shift lever in P	7 V or higher	-
G39-23 (SPD) - G39-6 (GND)	Input	R - W-B	Vehicle speed signal	Engine switch on (IG), vehicle being driven at approx. 5 km/h (3 mph)	Pulse generation (See waveform 4)	Vehicle Speed Signal

HINT:

*1: When the shift lever is in P and the engine switch is off, if any door is opened or closed, the steering is locked. When the key is inside the vehicle and the engine switch is turned on (ACC) or on (IG), the steering unlocks.
*2: When the engine is cranking, the battery voltage may momentarily drop to approximately 6 V.
*3: The steering lock motor operates when the following conditions are met and a door is opened:
- The shift lever is in P.
- While carrying the key, the engine switch is turned on (IG) to unlock the steering, and then the engine switch is turned off.

Using an oscilloscope, check the waveform of the ECU.

Waveform 1

Fig 2: Identifying Waveform 1

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Item	Content
Tester Connection	G38-4 (NE) - G39-6 (GND)
Tool Setting	1 V/DIV., 2 ms./DIV.
Vehicle Condition	Idling with warm engine

HINT:

The wavelength becomes shorter as the engine speed increases.

Waveform 2

Fig 3: Waveform 1 (Reference)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Item	Content
Tester Connection	G39-8 (SLR+) - G39-6 (GND)
Tool Setting	2 V/DIV., 200 ms./DIV.
Vehicle Condition	Steering lock motor not operating → Steering lock motor operating → Steering lock motor not operating

TEXT IN ILLUSTRATION

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

Waveform 3

Fig 4: Waveform 3

Item	Content
Tester Connection	G39-16 (P) - G39-6 (GND)
Tool Setting	2 V/DIV., 200 ms./DIV.
Vehicle Condition	Shift lever in P → Shift lever not in P

TEXT IN ILLUSTRATION

*a	Shift lever in P
*b	Shift lever not in P

Waveform 4

Fig 5: Waveform 3

Item	Content
Tester Connection	G39-23 (SPD) - G39-6 (GND)
Tool Setting	5 V/DIV., 100 ms./DIV.
Vehicle Condition	Engine switch on (IG), vehicle being driven at approx. 5 km/h (3 mph)

HINT:

The wavelength becomes shorter as the vehicle speed increases.