| Last Modified: 07-31-2024 | 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.
|
|