2UZ-FE ENGINE CONTROL: SFI SYSTEM: TERMINALS OF ECM (2008 Sequoia)

TERMINALS OF ECM

1. CHECK ECM

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

HINT:

The standard normal voltage between each pair of ECM terminals is shown in the table below. The appropriate conditions for checking each pair of terminals are also indicated. The result of checks should be compared with the standard normal voltage for that pair of terminals, displayed in the Specified Condition column. The illustration above can be used as a reference to identify the ECM terminal locations.

Terminal No. (Symbol)	Wiring Color	Terminal Description	Condition	Specified Condition
A27-1 (BATT) - D56-81 (E1)	L - BR	Battery (for measuring battery voltage and for ECM memory)	Always	11 to 14 V
D56-41 (+BM) - D56-81 (E1)	P - BR	Power source of throttle actuator	Always	11 to 14 V
A27-28 (IGSW) - D56-81 (E1)	LG - BR	Ignition switch	Ignition switch ON	11 to 14 V
A27-3 (+B) - D56-81 (E1)	GR - BR	Power source of ECM	Ignition switch ON	11 to 14 V
A27-2 (+B2) - D56-81 (E1)	GR - BR	Power source of ECM	Ignition switch ON	11 to 14 V
D56-58 (OC1+) - D56-57 (OC1-)	B - B-L	Camshaft timing oil control valve (OCV)	Ignition switch ON	Pulse generation (see waveform 1)
D56-52 (OC2+) - D56-51 (OC2-)	L-B - R-B	Camshaft timing oil control valve (OCV) (Intake side (for bank 2))	Ignition switch ON	Pulse generation (see waveform 1)
A27-34 (MREL) - D56-81 (E1)	W - BR	EFI MAIN relay	Ignition switch ON	11 to 14 V
D56-74 (VG) - D56-75 (E2G)	L-Y - G-W	Mass air flow meter	Idling, Shift lever in P or N, A/C switch OFF	0.5 to 3.0 V
D56-73 (THA) - D56-97 (ETHW)	Y-B - BR	Intake air temperature sensor	Idling, Intake air temperature 20°C (68°F)	0.5 to 3.4 V
D56-76 (THW) - D56-97 (ETHW)	G-B - BR	Engine coolant temperature sensor	Idling, Engine coolant temperature 80°C (176°F)	0.2 to 1.0 V
D56-80 (VCTA) - D56-79 (ETA)	L - Y	Power source of throttle position sensor (specific voltage)	Ignition switch ON	4.5 to 5.5 V
D56-78 (VTA1) - D56-79 (ETA)	R-Y - Y	Throttle position sensor (for engine control)	Ignition switch ON, Throttle valve fully closed	0.5 to 1.2 V
D56-78 (VTA1) - D56-79 (ETA)	R-Y - Y	Throttle position sensor (for engine control)	Ignition switch ON, Throttle valve fully open	3.2 to 4.8 V
D56-77 (VTA2) - D56-79 (ETA)	Y-B - Y	Throttle position sensor (for sensor malfunction detection)	Ignition switch ON, Throttle valve fully closed	2.1 to 3.1 V
D56-77 (VTA2) - D56-79 (ETA)	Y-B - Y	Throttle position sensor (for sensor malfunction detection)	Ignition switch ON, Throttle valve fully open	4.5 to 5.5 V
A27-55 (VPA) - A27-58 (EPA)	W - O	Accelerator pedal position sensor (for engine control)	Ignition switch ON, Accelerator pedal released	0.5 to 1.1 V
A27-55 (VPA) - A27-58 (EPA)	W - O	Accelerator pedal position sensor (for engine control)	Ignition switch ON, Accelerator pedal fully depressed	2.6 to 4.5 V
A27-56 (VPA2) - A27-60 (EPA2)	LG - BR	Accelerator pedal position sensor (for sensor malfunctioning detection)	Ignition switch ON, Accelerator pedal released	1.2 to 2.0 V
A27-56 (VPA2) - A27-60 (EPA2)	LG - BR		Ignition switch ON, Accelerator pedal fully depressed	3.4 to 5.3 V
A27-57 (VCPA) - A27-58 (EPA)	B - O	Power source of accelerator pedal position sensor (for VPA)	Ignition switch ON	4.5 to 5.5 V
A27-59 (VCP2) - A27-60 (EPA2)	V - BR	Power source of accelerator pedal position sensor (for VPA2)	Ignition switch ON	4.5 to 5.5 V
D56-22 (HA1A) - D56-23 (E04)	L - W-B	A/F sensor heater	Idling	Below 3.0 V
D56-20 (HA2A) - D56-21 (E05)	G - W-B	A/F sensor heater	Ignition switch ON	11 to 14 V
D56-126 (A1A+) - D56-81 (E1)	G -BR	A/F sensor	Ignition switch ON	3.3 V*
D56-125 (A1A-) - D56-81 (E1)	R - BR	A/F sensor	Ignition switch ON	2.9 V*
D56-103 (A2A+) - D56-81 (E1)	P - BR	A/F sensor	Ignition switch ON	3.3 V*
D56-102 (A2A-) - D56-81 (E1)	L - BR	A/F sensor	Ignition switch ON	2.9 V*
D56-45 (HT1B) - D56-46 (E03)	G-B - W-B	Heated oxygen sensor heater	Idling	Below 3.0 V
D56-44 (HT2B) - D56-46 (E03)	B - W-B	Heated oxygen sensor heater	Ignition switch ON	11 to 14 V
D56-114 (OX1B) - D56-115 (EX1B)	W - BR	Heated oxygen sensor	Engine speed maintained at 2500 rpm for 2 minutes after warming up sensor	Pulse generation (see waveform 2)
D56-112 (OX2B) - D56-113 (EX2B)	B - BR	Heated oxygen sensor		Pulse generation (see waveform 2)
D56-86 (#10) - D56-43 (E01)	R-L - W-B	Injector	Ignition switch ON	11 to 14 V
D56-109 (#20) - D56-43 (E01)	L - W-B
D56-85 (#30) - D56-43 (E01)	R - W-B
D56-108 (#40) - D56-43 (E01)	Y - W-B
D56-84 (#50) - D56-43 (E01)	G - W-B		Idling	Pulse generation (see waveform 3)
D56-107 (#60) - D56-43 (E01)	R - W-B
D56-83 (#70) - D56-43 (E01)	W - W-B
D56-106 (#80) - D56-43 (E01)	R-B - W-B
D56-94 (KNK1) - D56-93 (EKNK)	G - R	Knock sensor	Engine speed maintained at 4000 rpm after warming up engine	Pulse generation (see waveform 4)
D56-117 (KNK2) - D56-116 (EKN2)	W - B	Knock sensor	Engine speed maintained at 4000 rpm after warming up engine	Pulse generation (see waveform 4)
D56-92 (VV1+) - D56-91 (VV1-)	R - G	Variable valve timing (VVT) sensor (Intake side (for bank 1))	Idling	Pulse generation (see waveform 5)
D56-87 (VV2+) - D56-88 (VV2-)	R - W	Variable valve timing (VVT) sensor (Intake side (for bank 2))	Idling	Pulse generation (see waveform 5)
D56-110 (NE+) - D56-111 (NE-)	L - G	Crankshaft position sensor	Idling	Pulse generation (see waveform 5)
D56-40 (IGT1) - D56-81 (E1)	B-Y - BR	Ignition coil (ignition signal)	Idling	Pulse generation (see waveform 6)
D56-33 (IGT2) - D56-81 (E1)	L-Y - BR
D56-37 (IGT3) - D56-81 (E1)	B - BR
D56-38 (IGT4) - D56-81 (E1)	L-B - BR
D56-35 (IGT5) - D56-81 (E1)	G-R - BR
D56-36 (IGT6) - D56-81 (E1)	G - BR
D56-34 (IGT7) - D56-81 (E1)	G-W - BR
D56-39 (IGT8) - D56-81 (E1)	G-B - BR
D56-104 (IGF1) - D56-81 (E1)	G-B - BR	Ignition coil (ignition confirmation signal)	Ignition switch ON	4.5 to 5.5 V
D56-104 (IGF1) - D56-81 (E1)	G-B - BR	Ignition coil (ignition confirmation signal)	Idling	Pulse generation (see waveform 6)
D56-105 (IGF2) - D56-81 (E1)	R - BR	Ignition coil (ignition confirmation signal)	Ignition switch ON	4.5 to 5.5 V
D56-105 (IGF2) - D56-81 (E1)	R - BR	Ignition coil (ignition confirmation signal)	Idling	Pulse generation (see waveform 6)
D56-63 (PRG) - D56-81 (E1)	L-B - BR	Purge VSV	Ignition switch ON	11 to 14 V
D56-63 (PRG) - D56-81 (E1)	L-B - BR	Purge VSV	Idling	Pulse generation (see waveform 7)
A27-13 (SPD) - D56-81 (E1)	B - BR	Speed signal from combination meter	Driving at 20 km/h (12 mph)	Pulse generation (see waveform 8)
A27-46 (STA) - D56-81 (E1)	R - BR	Starter signal	Cranking	5.5 V or more
D56-120 (NSW) - D56-81 (E1)	L - BR	Park/neutral position switch	Ignition switch ON, Shift lever not in P or N	11 to 14 V
D56-120 (NSW) - D56-81 (E1)	L - BR	Park/neutral position switch	Ignition switch ON, Shift lever in P or N	Below 3.0 V
A27-26 (STP) - D56-81 (E1)	LG - BR	Stop light switch	Brake pedal depressed	7.5 to 14 V
A27-26 (STP) - D56-81 (E1)	LG - BR	Stop light switch	Brake pedal released	Below 1.5 V
A27-35 (ST1-) - D56-81 (E1)	R - BR	Stop light switch (opposite to STP terminal)	Ignition switch ON, Brake pedal depressed	Below 1.5 V
A27-35 (ST1-) - D56-81 (E1)	R - BR	Stop light switch (opposite to STP terminal)	Ignition switch ON, Brake pedal released	7.5 to 14 V
D56-19 (M+) - D56-82 (ME01)	R - W-B	Throttle actuator	Idling with warm engine	Pulse generation (see waveform 9)
D56-18 (M-) - D56-82 (ME01)	G - W-B	Throttle actuator	Idling with warm engine	Pulse generation (see waveform 10)
A27-48 (FC) - D56-81 (E1)	L - BR	Fuel pump control	Ignition switch ON	11 to 14 V
A27-52 (FPC) - D56-81 (E1)	O - BR	Fuel pump control	Ignition switch ON	Below 1.5 V
A27-24 (W) - D56-81 (E1)	P - BR	MIL	Ignition switch ON	Below 3.0 V
A27-24 (W) - D56-81 (E1)	P - BR	MIL	Idling	11 to 14 V
A27-16 (TC) - D56-81 (E1)	R - BR	Terminal TC of DLC3	Ignition switch ON	11 to 14 V
A27-15 (TACH) - D56-81 (E1)	W - BR	Engine speed	Idling	Pulse generation (see waveform 11)
A27-30 (VPMP) - D56-81 (E1)	V - BR	Vent valve (built into canister pump module)	Ignition switch ON	11 to 14 V
A27-49 (MPMP) - D56-81 (E1)	G - BR	Leak detection pump (built into canister pump module)	Leak detection pump OFF	Below 3.0 V
A27-49 (MPMP) - D56-81 (E1)	G - BR	Leak detection pump (built into canister pump module)	Leak detection pump ON	11 to 14 V
D56-66 (VC) - D56-97 (ETHW)	L - BR	Power source for sensor (specific voltage)	Ignition switch ON	4.5 to 5.5 V
D56-121 (PPMP) - D56-97 (ETHW)	P - BR	Canister pressure sensor (built into canister pump module)	Ignition switch ON	3.3 to 4.0 V
D56-32 (ALT) - D56-81 (E1)	R - BR	Generator	Ignition switch ON	11 to 14 V
A27-10 (CANH) - D56-81 (E1)	GR - BR	CAN communication line	Ignition switch ON	Pulse generation (see waveform 12)
A27-11 (CANL) - D56-81 (E1)	W - BR	CAN communication line	Ignition switch ON	Pulse generation (see waveform 13)
D56-62 (ACIS) - D56-81 (E1)	R-W - BR	VSV for ACIS (Acoustic Control Induction System) operation signal	Ignition switch ON	11 to 14 V
D56-28 (AIRV) - D56-81 (E1)	BR - BR	Air switching valve for secondary air injection system	Ignition switch ON	11 to 14 V
D56-54 (AIRP) - D56-81 (E1)	P - BR	Air pump control	Ignition switch ON	11 to 14 V
D56-30 (AIDI) - D56-81 (E1)	G - BR	Diagnostic information signal for air injection system	Air injection system operates	Pulse generation (see waveform 15)
A27-54 (AIP) - D56-98 (ETHA)	Y - BR	Secondary air injection system pressure signal	Ignition switch ON	3.0 to 3.6 V
A27-43 (ARV2) - D56-81 (E1)	V - BR	Air switching valve for secondary air injection system	Ignition switch ON	11 to 14 V
D56-53 (ARP2) - D56-81 (E1)	P-L - BR	Air pump control	Ignition switch ON	11 to 14 V
D56-29 (AID2) - D56-81 (E1)	G - BR	Diagnostic information signal for air injection system	Air injection system operates	Pulse generation (see waveform 15)
A27-53 (AIP2) - D56-97 (ETHW)	G - BR	Secondary air injection system pressure signal	Ignition switch ON	3.0 to 3.6 V
D56-90 (G2) - D56- 89 (G2-)	R - G	Camshaft position sensor	Idling	Pulse generation (see waveform 14)
A27-18 (DI) - D56-81 (E1)	Y - BR	Fuel pump control	Ignition switch ON	0 to 3.0 V
A27-14 (STSW) - D56-81 (E1)	BR - BR	Starter switch	Shift lever in P or N, Cranking	6.0 V or more
A27-41 (ACCR) - D56-81 (E1)	BR - BR	ACC relay control signal	Ignition switch ON → Cranking	11 to 14 V → Below 1 V
D56-16 (STAR) - D56-81 (E1)	L - BR	Starter relay control	Ignition switch ON	Below 1.5 V
D56-16 (STAR) - D56-81 (E1)	L - BR	Starter relay control	Cranking	5.5 V or more
D56-72 (PSP) - D56-81 (E1)	G - BR	Power steering oil pressure sensor	Ignition switch ON	0.5 to 4.5 V

HINT:

*: The ECM terminal voltage is constant regardless of the output voltage from the sensor.

(b) WAVEFORM 1:

Camshaft Timing Oil Control Valve (OCV)

Terminal No. (Symbol)

Tool Setting

Condition

D56-58 (OC1+) - D56-57 (OC1-)

D56-52 (OC2+) - D56-51 (OC2-)

5 V/DIV., 1 msec./DIV.

Idling

Heated Oxygen Sensor

Terminal No. (Symbol)

Tool Setting

Condition

D56-114 (OX1B) - D56-115 (EX1B)

D56-112 (OX2B) - D56-113 (EX2B)

0.2 V/DIV., 200 msec./DIV.

Engine speed maintained at 2500 rpm for 2 minutes after warming up sensor

HINT:

In Data List, item O2S B1 S2 shows the ECM input values from the heated oxygen sensor.

(d) WAVEFORM 3:

Injector No. 1 (to No. 8) Injection Signal

Terminal No. (Symbol)

Tool Setting

Condition

D56-86 (#10) - D56-43 (E01)

D56-109 (#20) - D56-43 (E01)

D56-85 (#30) - D56-43 (E01)

D56-108 (#40) - D56-43 (E01)

D56-84 (#50) - D56-43 (E01)

D56-107 (#60) - D56-43 (E01)

D56-83 (#70) - D56-43 (E01)

D56-106 (#80) - D56-43 (E01)

20 V/DIV., 20 msec./DIV.

Idling

HINT:

The wavelength becomes shorter as the engine rpm increases.

(e) WAVEFORM 4:

Knock Sensor

Terminal No. (Symbol)

Tool Setting

Condition

D56-94 (KNK1) - D56-93 (EKNK)

D56-117 (KNK2) - D56-116 (EKN2)

1 V/DIV., 1 msec./DIV.

Engine speed maintained at 4000 rpm after warming up engine

HINT:

The wavelength becomes shorter as the engine rpm increases.
The waveforms and amplitudes displayed differ slightly depending on the vehicle.

(f) WAVEFORM 5:

Variable Valve Timing (VVT) Sensor (for Bank 1, 2) and Crankshaft Position Sensor

Terminal No. (Symbol)

Tool Setting

Condition

CH1: D56-92 (VV1+) - D56-91 (VV1-)

CH2: D56-87 (VV2+) - D56-88 (VV2-)

CH3: D56-110 (NE+) - D56-111 (NE-)

2 V/DIV., 20 msec./DIV.

Idle after engine warmed-up

HINT:

The wavelength becomes shorter as engine rpm increases.

(g) WAVEFORM 6:

Igniter IGT Signal (from ECM to Igniter) and Igniter IGF Signal (from Igniter to ECM)

Terminal No. (Symbol)

Tool Setting

Condition

(a) D56-40 (IGT1) - D56-81 (E1)

(a) D56-33 (IGT2) - D56-81 (E1)

(a) D56-37 (IGT3) - D56-81 (E1)

(a) D56-38 (IGT4) - D56-81 (E1)

(a) D56-35 (IGT5) - D56-81 (E1)

(a) D56-36 (IGT6) - D56-81 (E1)

(a) D56-34 (IGT7) - D56-81 (E1)

(a) D56-39 (IGT8) - D56-81 (E1)

(b) D56-104 (IGF1) - D56-81 (E1)

(b) D56-105 (IGF2) - D56-81 (E1)

2 V/DIV., 20 msec./DIV.

Idling

HINT:

The wavelength becomes shorter as engine rpm increases.

(h) WAVEFORM 7:

Purge VSV

Terminal No. (Symbol)	Tool Setting	Condition
D56-63 (PRG) - D56-81 (E1)	10 V/DIV., 10 to 100 msec./DIV.	Idling

HINT:

If the waveform is not similar to the illustration, check the waveform again after idling for 10 minutes or more.

(i) WAVEFORM 8:

Vehicle Speed Signal

Terminal No. (Symbol)	Tool Setting	Condition
A27-13 (SPD) - D56-81 (E1)	2 V/DIV., 20 msec./DIV.	Driving at 20 km/h (12 mph)

HINT:

The wavelength becomes shorter as the vehicle speed increases.

(j) WAVEFORM 9:

Throttle Actuator Positive Terminal

Terminal No. (Symbol)	Tool Setting	Condition
D56-19 (M+) - D56-82 (ME01)	5 V/DIV., 1 msec./DIV.	Idling with warm engine

HINT:

The duty ratio varies depending on the throttle actuator operation.

(k) WAVEFORM 10:

Throttle Actuator Negative Terminal

Terminal No. (Symbol)	Tool Setting	Condition
D56-18 (M-) - D56-82 (ME01)	5 V/DIV., 1 msec./DIV.	Idling with warm engine

HINT:

The duty ratio varies depending on the throttle actuator operation.

(l) WAVEFORM 11:

Engine Speed Signal

Terminal No. (Symbol)	Tool Setting	Condition
A27-15 (TACH) - D56-81 (E1)	5 V/DIV., 10 msec./DIV.	Idling

HINT:

The wavelength becomes shorter as the engine rpm increases.

(m) WAVEFORM 12:

CAN Communication Signal (Reference)

Terminal No. (Symbol)	Tool Setting	Condition
A27-10 (CANH) - D56-81 (E1)	1 V/DIV., 10 μsec./DIV.	Engine stops and ignition switch ON

HINT:

The waveform varies depending on the CAN communication signal.

(n) WAVEFORM 13:

CAN Communication Signal (Reference)

Terminal No. (Symbol)	Tool Setting	Condition
A27-11 (CANL) - D56-81 (E1)	1 V/DIV., 10 μsec./DIV.	Engine stops and ignition switch ON

HINT:

The waveform varies depending on the CAN communication signal.

(o) WAVEFORM 14:

Camshaft Position Sensor

Terminal No. (Symbol)	Tool Setting	Condition
D56-90 (G2) - D56- 89 (G2-)	2 V/DIV., 20 msec./DIV.	Idle after engine warmed up

HINT:

The wavelength becomes shorter as engine rpm increases.
*1: 720°
*2: 180°
*3: 120°
*4: 60°

(p) WAVEFORM 15:

Terminal DI of Air Injection Control Driver

Terminal No. (Symbol)

Tool Setting

Condition

D56-30 (AIDI) - D56-81 (E1)

D56-29 (AID2) - D56-81 (E1)

5 V/DIV., 20 to 40 msec./DIV.

Performing system check using Techstream (air injection check)

HINT:

The wavelength changes when the air injection control driver detects malfunctions in the air injection system .