Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001HSSJ
Model Year Start: 2020 Model: Corolla Prod Date Range: [03/2019 - 11/2022]
Title: 2ZR-FAE (ENGINE CONTROL): SFI SYSTEM: TERMINALS OF ECM; 2020 - 2023 MY Corolla [03/2019 - 11/2022]

TERMINALS OF ECM

HINT:

The standard voltage between each pair of the ECM terminals is shown in the table below. The appropriate conditions for checking each pair of the terminals are also indicated.

The result of checks should be compared with the standard voltage for that pair of terminals, and 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

A46-1 (BATT) - C77-59 (E1)

P - W-B

Battery (for measuring battery voltage and for ECM memory)

Always

11 to 14 V

A46-2 (+B) - C77-59 (E1)

L - W-B

Power source of ECM

Ignition switch ON

11 to 14 V

A46-3 (+B2) - C77-59 (E1)

B - W-B

Power source of ECM

Ignition switch ON

11 to 14 V

A46-6 (IGSW) - C77-59 (E1)

BE - W-B

Ignition switch signal

Ignition switch ON

11 to 14 V

A46-9 (STP) - C77-59 (E1)

L - W-B

Stop light switch assembly signal

Brake pedal depressed

7.5 to 14 V

Brake pedal released

Below 1.5 V

A46-10 (ST1-) - C77-59 (E1)

Y - W-B

Stop light switch assembly signal

(opposite to STP terminal)

Ignition switch ON, brake pedal depressed

Below 1.5 V

Ignition switch ON, brake pedal released

7.5 to 14 V

A46-13 (CANH) - C77-59 (E1)

GR - W-B

CAN communication line

Ignition switch ON

Pulse generation

(See waveform 1)

A46-23 (NSW)*1 - C77-59 (E1)

GR - W-B

Park/Neutral position switch assembly signal

Ignition switch ON, shift lever not in P or N

11 to 14 V

Ignition switch ON, shift lever in P or N

Below 1.0 V

A46-26 (CANL) - C77-59 (E1)

BR - W-B

CAN communication line

Ignition switch ON

Pulse generation

(See waveform 2)

A46-29 (STA) - C77-59 (E1)

LG - W-B

Starter assembly signal

Cranking

6.0 V or higher

A46-30 (NEO)*2 - C77-59 (E1)

SB - W-B

Engine speed signal sent to certification ECU (smart key ECU assembly)

Idling with warm engine

Pulse generation

(See waveform 3)

A46-32 (EC) - Body ground

W-B - Body ground

Earth (ground) circuit of ECM

Always

Below 1 Ω

A46-38 (MPMP)*3 - A46-53 (EMPM)*3

LG - R

Leak detection pump (built into canister pump module)

Leak detection pump OFF

Below 3 V

Leak detection pump ON

9.0 to 14 V

A46-39 (VPMP)*3 - C77-59 (E1)

B - W-B

Vent valve (built into canister pump module)

Ignition switch ON

11 to 14 V

A46-40 (PPMP)*3 -A46-54 (EPPM)*3

GR - W

Canister pressure sensor (built into canister pump module)

Ignition switch ON

3.0 to 3.6 V

A46-41 (FC) - C77-59 (E1)

BE - W-B

Fuel pump control

Ignition switch ON

11 to 14 V

Idling

Below 1.5 V

A46-44 (SPD) - C77-59 (E1)

V - W-B

Vehicle speed signal from combination meter assembly signal

Driving at 20 km/h (12 mph)

Pulse generation

(See waveform 4)

A46-46 (MREL) - C77-59 (E1)

G - W-B

EFI-MAIN relay operation signal

Ignition switch ON

11 to 14 V

Ignition switch off

Below 1.5 V

A46-47 (VPA) - A46-48 (EPA)

R - L

Accelerator pedal position sensor signal (for engine control)

Ignition switch ON, accelerator pedal fully released

0.5 to 1.1 V

Ignition switch ON, accelerator pedal fully depressed

2.6 to 4.5 V

A46-49 (VCPA) - A46-48 (EPA)

Y - L

Power source of accelerator pedal position sensor (for VPA)

Ignition switch ON

4.5 to 5.5 V

A46-50 (VPA2) - A46-51 (EPA2)

B - W

Accelerator pedal position sensor signal

Ignition switch ON, accelerator pedal fully released

1.2 to 2.0 V

Ignition switch ON, accelerator pedal fully depressed

3.4 to 4.75 V

A46-52 (VCP2) - A46-51 (EPA2)

G - W

Power source of accelerator pedal position sensor (for VPA2)

Ignition switch ON

4.5 to 5.5 V

A46-55 (VCPP)*3 -A46-54 (EPPM)*3

P - W

Power source for canister pressure sensor (specific voltage)

Ignition switch ON

4.5 to 5.5 V

A46-60 (RFC) - C77-59 (E1)

R - W-B

Cooling fan control signal

Ignition switch ON, A/C switch on (max cool)

Pulse generation

(See waveform 5)

C77-26 (E04) - Body ground

W-B - Body ground

Earth (ground) circuit of ECM

Always

Below 1 Ω

C77-27 (HA1A) - C77-26 (E04)

R - W-B

Air fuel ratio sensor heater operation signal

Ignition switch ON

11 to 14 V

Idling with cold engine

Pulse generation

(See waveform 6)

C77-28 (ME01) - Body ground

W-B - Body ground

Earth (ground) circuit of ECM

Always

Below 1 Ω

C77-29 (+BM) - C77-59 (E1)

Y - W-B

Power source of throttle actuator

Always

11 to 14 V

C77-30 (M-) - C77-28 (ME01)

R - W-B

Throttle actuator operation signal (negative signal)

Idling with warm engine

Pulse generation

(See waveform 7)

C77-31 (CAN+) - C77-59 (E1)

G - W-B

CAN communication line

Ignition switch ON

Pulse generation

(See waveform 1)

C77-32 (CAN-) - C77-59 (E1)

W - W-B

CAN communication line

Ignition switch ON

Pulse generation

(See waveform 2)

C77-33 (PRG) - C77-59 (E1)

L - W-B

Purge VSV operation signal

Ignition switch ON

11 to 14 V

Idling with warm engine, under purge control

Pulse generation

(See waveform 8)

C77-35 (OC1+) - C77-34 (OC1-)

B - Y

Camshaft timing oil control valve assembly (for intake camshaft) operation signal

Idling

Pulse generation

(See waveform 9)

C77-37 (OE1+) - C77-36 (OE1-)

G - P

Camshaft timing oil control valve assembly (for exhaust camshaft) operation signal

Idling

Pulse generation

(See waveform 10)

C77-56 (HT1B) - C77-59 (E1)

BR - W-B

Heated oxygen sensor heater operation signal

Ignition switch ON

11 to 14 V

Idling with cold engine

Below 3.0 V

C77-57 (E01) - Body ground

W-B - Body ground

Earth (ground) circuit of ECM

Always

Below 1 Ω

C77-58 (E02) - Body ground

W-B - Body ground

Earth (ground) circuit of ECM

Always

Below 1 Ω

C77-59 (E1) - Body ground

W-B - Body ground

Earth (ground) circuit of ECM

Always

Below 1 Ω

C77-60 (M+) - C77-28 (ME01)

G - W-B

Throttle actuator operation signal (positive terminal)

Idling with warm engine

Pulse generation

(See waveform 11)

C77-65 (D) - C77-59 (E1)

R - W-B

Clutch switch assembly signal*4

Ignition switch ON, clutch pedal depressed

Below 1.5 V

Ignition switch ON, clutch pedal fully released

11 to 14 V

C77-72 (IGT4) - C77-59 (E1)

W - W-B

No. 4 ignition coil assembly signal

(ignition signal)

Idling

Pulse generation

(See waveform 12)

C77-73 (IGT3) - C77-59 (E1)

G - W-B

No. 3 ignition coil assembly signal

(ignition signal)

Idling

Pulse generation

(See waveform 12)

C77-74 (IGT2) - C77-59 (E1)

LG - W-B

No. 2 ignition coil assembly signal

(ignition signal)

Idling

Pulse generation

(See waveform 12)

C77-75 (IGT1) - C77-59 (E1)

V - W-B

No. 1 ignition coil assembly signal

(ignition signal)

Idling

Pulse generation

(See waveform 12)

C77-77 (VCPM) - C77-76 (EPIM)

R - Y

Power source of manifold absolute pressure sensor

Ignition switch ON

4.75 to 5.25 V

C77-78 (PIM) - C77-76 (EPIM)

GR - Y

Manifold absolute pressure sensor signal

Ignition switch ON

3.0 to 5.25 V

C77-80 (EV1+) - C77-112 (EV1-)

L - B

Cam position sensor (for exhaust camshaft) signal

Idling with warm engine

Pulse generation

(See waveform 13)

C77-82 (VV1+) - C77-115 (VV1-)

W - P

Cam position sensor (for intake camshaft) signal

Idling with warm engine

Pulse generation

(See waveform 13)

C77-86 (VSM)*3 - C77-118 (E2VS)*3

P - Y

VALVEMATIC shaft sensor (cam position sensor) signal

Idling

0.475 to 4.725 V

C77-89 (THEO) - C77-90 (ETHE)

R - Y

Engine oil temperature sensor signal

Idling with warm engine

0.3 to 0.85 V

C77-95 (#20) - C77-57 (E01)

GR - W-B

No. 2 fuel injector assembly signal

Ignition switch ON

11 to 14 V

Idling with warm engine

Pulse generation

(See waveform 14)

C77-96 (#30) - C77-57 (E01)

L - W-B

No. 3 fuel injector assembly signal

Ignition switch ON

11 to 14 V

Idling with warm engine

Pulse generation

(See waveform 14)

C77-97 (#40) - C77-57 (E01)

W - W-B

No. 4 fuel injector assembly signal

Ignition switch ON

11 to 14 V

Idling with warm engine

Pulse generation

(See waveform 14)

C77-98 (#10) - C77-57 (E01)

B - W-B

No. 1 fuel injector assembly signal

Ignition switch ON

11 to 14 V

Idling with warm engine

Pulse generation

(See waveform 14)

C77-99 (OX1B) - C77-131 (EX1B)

R - G

Heated oxygen sensor signal

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

Pulse generation

(See waveform 15)

C77-100 (A1A+) - C77-59 (E1)

Y - W-B

Air fuel ratio sensor signal

Ignition switch ON

3.0 to 3.6 V*5

C77-101 (VTA2) - C77-133 (ETA)

R - B

Throttle position sensor signal (for sensor malfunction detection)

Ignition switch ON, accelerator pedal fully released

2.1 to 3.1 V

Ignition switch ON, accelerator pedal fully depressed

4.6 to 5.0 V

C77-103 (VCVG) - C77-59 (E1)

W - W-B

Power source of mass air flow meter sub-assembly (specific voltage)

Ignition switch ON

4.8 to 5.2 V

C77-108 (GE01) - Body ground

BR - Body ground

Shielded earth (ground) circuit of throttle actuator

Always

Below 1 Ω

C77-111 (VCE1) - C77-59 (E1)

W - W-B

Power source of cam position sensor (for exhaust camshaft) (specific voltage)

Ignition switch ON

4.5 to 5.5 V

C77-114 (NE+) - C77-113 (NE-)

B - W

Crank position sensor signal

Idling with warm engine

Pulse generation

(See waveform 16)

C77-116 (VCV1) - C77-59 (E1)

L - W-B

Power source of cam position sensor (for intake camshaft) (specific voltage)

Ignition switch ON

4.5 to 5.5 V

C77-117 (VCVS)*3 - C77-118 (E2VS)*3

V - Y

Power source of VALVEMATIC shaft sensor (cam position sensor)

Ignition switch ON

4.5 to 5.5 V

C77-120 (THW) - C77-119 (ETHW)

B - BR

Engine coolant temperature sensor signal

Idling with warm engine, engine coolant temperature 75 to 100°C (167 to 212°F)

0.2 to 1.0 V

C77-122 (KNK1) - C77-121 (EKNK)

B - W

Knock control sensor signal

Engine speed maintained at 4000 rpm after warming up engine

Pulse generation

(See waveform 17)

C77-132 (A1A-) - C77-59 (E1)

L - W-B

Air fuel ratio sensor signal

Ignition switch ON

2.7 to 3.3 V*5

C77-134 (VCTA) - C77-133 (ETA)

G - B

Power source for throttle position sensor (specific voltage)

Ignition switch ON

4.5 to 5.5 V

C77-135 (VTA1) - C77-133 (ETA)

LG - B

Throttle position sensor signal (for engine control)

Ignition switch ON, accelerator pedal fully released

0.5 to 1.1 V

Ignition switch ON, accelerator pedal fully depressed

3.2 to 4.8 V

C77-136 (SDWN) - C77-59 (E1)

R - W-B

Continuously variable valve lift controller assembly signal

Ignition switch ON

5.4 to 8.6 V

C77-137 (VG) - C77-104 (E2G)

V - B

Mass air flow meter sub-assembly signal

Idling, shift lever in P or N (neutral), A/C switch off

0.5 to 3.0 V

C77-138 (THA) - C77-104 (E2G)

L - B

Intake air temperature sensor signal

Idling, intake air temperature 0 to 80°C (32 to 176°F)

0.5 to 3.4 V

  • *1: for CVT models
  • *2: w/ Smart Key System
  • *3: except Mexico models
  • *4: for Manual Transaxle models
  • *5: The ECM terminal voltage is constant regardless of the output voltage from the sensor.

WAVEFORM 1

CAN Communication Signal (Reference)

ECM Terminal Name

Between CANH and E1

Between CAN+ and E1

Tester Range

1 V/DIV., 10 μs./DIV.

Condition

Ignition switch ON

HINT:

The waveform varies depending on the CAN communication signal.

WAVEFORM 2

CAN Communication Signal (Reference)

ECM Terminal Name

Between CANL and E1

Between CAN- and E1

Tester Range

1 V/DIV., 10 μs./DIV.

Condition

Ignition switch ON

HINT:

The waveform varies depending on the CAN communication signal.

WAVEFORM 3

Engine Speed Signal

ECM Terminal Name

Between NEO and E1

Tester Range

5 V/DIV., 2 ms./DIV.

Condition

Idling with warm engine

HINT:

The wavelength becomes shorter as the engine speed increases.

WAVEFORM 4

Vehicle Speed Signal

ECM Terminal Name

Between SPD and E1

Tester Range

2 V/DIV., 20 ms./DIV.

Condition

Driving at 20 km/h (12 mph)

HINT:

The wavelength becomes shorter as the vehicle speed increases.

WAVEFORM 5

Cooling Fan Control Signal

ECM Terminal Name

Between RFC and E1

Tester Range

1 V/DIV., 2 ms./DIV.

Condition

Ignition switch ON, A/C switch on (max cool)

HINT:

The duty ratio varies depending on the engine coolant temperature.

WAVEFORM 6

Air Fuel Ratio Sensor Heater Operation Signal

ECM Terminal Name

Between HA1A and E04

Tester Range

5 V/DIV., 10 ms./DIV.

Condition

Idling with cold engine

WAVEFORM 7

Throttle Actuator Negative Terminal Signal

ECM Terminal Name

Between M- and ME01

Tester Range

5 V/DIV., 1 ms./DIV.

Condition

Idling with warm engine

HINT:

The duty ratio varies depending on the throttle actuator operation.

WAVEFORM 8

Purge VSV Operation Signal

ECM Terminal Name

Between PRG and E1

Tester Range

10 V/DIV., 20 ms./DIV.

Condition

Idling with warm engine, under purge control

HINT:

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

WAVEFORM 9

Camshaft Timing Oil Control Valve Assembly (for Intake Camshaft) Signal

ECM Terminal Name

Between OC1+ and OC1-

Tester Range

5 V/DIV., 1 ms./DIV.

Condition

Idling

WAVEFORM 10

Camshaft Timing Oil Control Valve Assembly (for Exhaust Camshaft) Signal

ECM Terminal Name

Between OE1+ and OE1-

Tester Range

5 V/DIV., 1 ms./DIV.

Condition

Idling

WAVEFORM 11

Throttle Actuator Positive Terminal Signal

ECM Terminal Name

Between M+ and ME01

Tester Range

5 V/DIV., 1 ms./DIV.

Condition

Idling with warm engine

HINT:

The duty ratio varies depending on the throttle actuator operation.

WAVEFORM 12

Ignition Coil Assembly Signal (IGT Signal)

ECM Terminal Name

Between IGT (1 to 4) and E1

Tester Range

2 V/DIV., 20 ms./DIV.

Condition

Idling

HINT:

The wavelength becomes shorter as the engine speed increases.

WAVEFORM 13

Cam Position Sensor Signal

ECM Terminal Name

CH1: Between VV1+ and VV1-

CH2: Between EV1+ and EV1-

Tester Range

5 V/DIV., 20 ms./DIV.

Condition

Idling with warm engine

HINT:

The wavelength becomes shorter as the engine speed increases.

WAVEFORM 14

No. 1 (to No. 4) Fuel Injector Assembly Signal

ECM Terminal Name

Between #10 (to #40) and E01

Tester Range

20 V/DIV., 20 ms./DIV.

Condition

Idling with warm engine

HINT:

The wavelength becomes shorter as the engine speed increases.

WAVEFORM 15

Heated Oxygen Sensor Signal

ECM Terminal Name

Between OX1B and EX1B

Tester Range

0.2 V/DIV., 200 ms./DIV.

Condition

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

HINT:

In the Data List, the items O2S B1S2 show the values input to the ECM from the heated oxygen sensor.

WAVEFORM 16

Crank Position Sensor Signal

ECM Terminal Name

Between NE+ and NE-

Tester Range

5 V/DIV., 20 ms./DIV.

Condition

Idling with warm engine

HINT:

The wavelength becomes shorter as the engine speed increases.

WAVEFORM 17

Knock Control Sensor Signal

ECM Terminal Name

Between KNK1 and EKNK

Tester Range

1 V/DIV., 1 ms./DIV.

Condition

Engine speed maintained at 4000 rpm after warming up engine

HINT:

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