Last Modified: 11-20-2023 6.11:8.1.0 Doc ID: RM100000001NFKK
Model Year Start: 2020 Model: Camry Prod Date Range: [03/2020 -           ]
Title: A25A-FKS (ENGINE CONTROL): SFI SYSTEM: TERMINALS OF ECM; 2020 - 2024 MY Camry [03/2020 -        ]

TERMINALS OF ECM

HINT:

The standard voltage, resistance and waveform between each pair of the ECM terminals is shown in the table below. The appropriate conditions for checking each pair of the terminals is also indicated. The result of checks should be compared with the standard voltage, resistance and waveform for each pair of the terminals as 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

A24-1 (BATT) - A24-10 (E1)

G - W-B

Battery (for measuring battery voltage and ECM memory)

Always

11 to 14 V

A24-2 (IGSW) - A24-10 (E1)

B - W-B

Ignition switch signal

Ignition switch ON

11 to 14 V

A24-3 (VPMP) - A24-10 (E1)

L - W-B

Vent valve (built into canister pump module)

Ignition switch ON

11 to 14 V

A24-5 (MPMP) - A24-10 (E1)

V - W-B

Leak detection pump (canister pump module)

Leak detection pump OFF

Below 3 V

Leak detection pump ON

11 to 14 V

A24-6 (FPC) - A24-10 (E1)

R - W-B

Fuel pump control

Ignition switch ON

Below 1.5 V

A24-8 (CANH) - A24-10 (E1)

B - W-B

CAN communication line

Engine stopped, ignition switch ON

Pulse generation

(See waveform 1)

A24-9 (+B) - A24-10 (E1)

L - W-B

  • Power source of ECM
  • Power source of throttle actuator

Ignition switch ON

11 to 14 V

A24-10 (E1) - Body ground

W-B - -

Ground

Always

Below 1 Ω

A24-12 (PWMS)*3 - A24-10 (E1)

LG - W-B

Drive mode switch (SPORT mode)

Ignition switch ON

11 to 14 V

Ignition switch ON, SPORT mode switch being pushed and held at SPORT position (SPORT mode)

0 to 1.5 V

A24-13 (SPCN)*3 - A24-10 (E1)

V - W-B

Drive mode switch (NORMAL mode)

Ignition switch ON

11 to 14 V

Ignition switch ON, NORMAL mode switch being pushed and held (NORMAL mode)

0 to 1.5 V

A24-14 (S) - A24-10 (E1)

GR - W-B

S shift position switch signal

Ignition switch ON, shift lever in S

11 to 14 V

Ignition switch ON, shift lever not in S

Below 1.5 V

A24-15 (MREL) - A24-10 (E1)

W - W-B

EFI-MAIN NO. 1 relay operation signal

Ignition switch ON

Below 1.5 V

A24-16 (NEO)*2 - A24-10 (E1)

B - W-B

Engine speed signal sent to other ECUs

Idling with warm engine

Pulse generation

(See waveform 2)

A24-18 (CANL) - A24-10 (E1)

W - W-B

CAN communication line

Engine stopped, ignition switch ON

Pulse generation

(See waveform 3)

A24-21 (STP) - A24-10 (E1)

SB - W-B

Stop light switch assembly signal

Brake pedal depressed

7.5 to 14 V

Brake pedal released

0 to 1.5 V

A24-22 (ST1-) - A24-10 (E1)

LG - W-B

Stop light switch assembly signal

(opposite to STP terminal)

Ignition switch ON, brake pedal depressed

0 to 1.5 V

Ignition switch ON, brake pedal released

7.5 to 14 V

A24-23 (NSW) - A24-10 (E1)

BE - 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 3.0 V

A24-30 (STA) - A24-10 (E1)

G - W-B

Starter assembly signal

Cranking

6.0 V or higher

A24-32 (RFC) - A24-10 (E1)

LG - W-B

Cooling fan control signal

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

Pulse generation

(See waveform 4)

A24-34 (IREL) - A24-10 (E1)

P - W-B

D INJ relay operation signal

Ignition switch ON

Below 1.5 V

A24-35 (+B2) - A24-10 (E1)

L - W-B

Power source of ECM

Ignition switch ON

11 to 14 V

A24-36 (E2) - Body ground

W-B - -

Ground

Always

Below 1 Ω

A24-39 (KSW) - A24-10 (E1)

R - W-B

Key unlock warning switch signal*1 or electrical key in vehicle signal*2

No key in ignition key cylinder*1 or electrical key outside vehicle*2

11 to 14 V

A24-42 (SPD) - A24-10 (E1)

L - W-B

Vehicle speed signal from combination meter assembly

Driving at 20 km/h (12 mph)

Pulse generation

(See waveform 5)

A24-45 (EC) - Body ground

W-B - -

Ground

Always

Below 1 Ω

A24-48 (VCPP) - A24-49 (EPPM)

B - LG

Power source for canister pressure sensor (specific voltage)

Ignition switch ON

4.5 to 5.5 V

A24-50 (PPMP) - A24-49 (EPPM)

P - LG

Canister pressure sensor (built into canister pump module)

Ignition switch ON

3.0 to 3.6 V

A24-53 (+BD1) - A24-10 (E1)

W - W-B

Power source of ECU (injector driver)

Ignition switch ON

11 to 14 V

A24-54 (E1D1) - Body ground

W-B - -

Ground

Always

Below 1 Ω

A24-55 (VPA) - A24-56 (EPA)

G - 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

A24-57 (VCPA) - A24-56 (EPA)

BE - L

Power source of accelerator pedal position sensor (for VPA)

Ignition switch ON

4.5 to 5.5 V

A24-58 (VPA2) - A24-59 (EPA2)

GR - P

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

A24-60 (VCP2) - A24-59 (EPA2)

SB - P

Power source of accelerator pedal position sensor (for VPA2)

Ignition switch ON

4.5 to 5.5 V

C101-23 (D) - A24-10 (E1)

R - W-B

D shift position switch signal

Ignition switch ON, shift lever in D or S

11 to 14 V

Ignition switch ON, shift lever not in D or S

Below 1 V

C101-24 (N) - A24-10 (E1)

LG - W-B

N shift position switch signal

Ignition switch ON, shift lever in N

11 to 14 V

Ignition switch ON, shift lever not in N

Below 1 V

C101-25 (R) - A24-10 (E1)

W - W-B

R shift position switch signal

Ignition switch ON, shift lever in R

11 to 14 V

Ignition switch ON, shift lever not in R

Below 1 V

C101-26 (P) - A24-10 (E1)

B - W-B

P shift position switch signal

Ignition switch ON, shift lever in P

11 to 14 V

Ignition switch ON, shift lever not in P

Below 1 V

C100-1 (M-) - A24-10 (E1)

L - W-B

Throttle actuator operation signal (negative signal)

Idling with warm engine

Pulse generation

(See waveform 6)

C100-2 (M+) - A24-10 (E1)

B - W-B

Throttle actuator operation signal (positive terminal)

Idling with warm engine

Pulse generation

(See waveform 7)

C100-3 (EGA+) - A24-10 (E1)

R - W-B

EGR valve assembly operation signal

Idling with warm engine

Pulse generation

(See waveform 8)

C100-4 (EGA-) - A24-10 (E1)

L - W-B

EGR valve assembly operation signal

Idling with warm engine

Pulse generation

(See waveform 8)

C100-6 (EGB+) - A24-10 (E1)

GR - W-B

EGR valve assembly operation signal

Idling with warm engine

Pulse generation

(See waveform 8)

C100-5 (EGB-) - A24-10 (E1)

V - W-B

EGR valve assembly operation signal

Idling with warm engine

Pulse generation

(See waveform 8)

C100-7 (HTHM) - A24-10 (E1)

G - W-B

Thermostat heater (water inlet with thermostat sub-assembly) operation signal

Ignition switch ON

11 to 14 V

C100-8 (HA1B) - A24-10 (E1)

R - W-B

Air fuel ratio sensor (sensor 2) heater operation signal

Ignition switch ON

11 to 14 V

Idling with cold engine

Pulse generation

(See waveform 9)

C100-9 (HA1A) - A24-10 (E1)

L - W-B

Air fuel ratio sensor (sensor 1) heater operation signal

Ignition switch ON

11 to 14 V

Idling with cold engine

Pulse generation

(See waveform 10)

C100-11 (#2D+) - A24-10 (E1)

L - W-B

Direct fuel injector assembly signal (No. 2 cylinder)

Idling with warm engine, Data List item "Injection Mode" displaying "Direct"

Pulse generation

(See waveform 11)

C100-10 (#2D-) - A24-10 (E1)

G - W-B

Direct fuel injector assembly signal (No. 2 cylinder)

Idling with warm engine, Data List item "Injection Mode" displaying "Direct"

Pulse generation

(See waveform 11)

C100-12 (#3D+) - A24-10 (E1)

W - W-B

Direct fuel injector assembly signal (No. 3 cylinder)

Idling with warm engine, Data List item "Injection Mode" displaying "Direct"

Pulse generation

(See waveform 11)

C100-13 (#3D-) - A24-10 (E1)

R - W-B

Direct fuel injector assembly signal (No. 3 cylinder)

Idling with warm engine, Data List item "Injection Mode" displaying "Direct"

Pulse generation

(See waveform 11)

C100-15 (#4D+) - A24-10 (E1)

P - W-B

Direct fuel injector assembly signal (No. 4 cylinder)

Idling with warm engine, Data List item "Injection Mode" displaying "Direct"

Pulse generation

(See waveform 11)

C100-14 (#4D-) - A24-10 (E1)

V - W-B

Direct fuel injector assembly signal (No. 4 cylinder)

Idling with warm engine, Data List item "Injection Mode" displaying "Direct"

Pulse generation

(See waveform 11)

C100-16 (#1D+) - A24-10 (E1)

W - W-B

Direct fuel injector assembly signal (No. 1 cylinder)

Idling with warm engine, Data List item "Injection Mode" displaying "Direct"

Pulse generation

(See waveform 11)

C100-17 (#1D-) - A24-10 (E1)

BR - W-B

Direct fuel injector assembly signal (No. 1 cylinder)

Idling with warm engine, Data List item "Injection Mode" displaying "Direct"

Pulse generation

(See waveform 11)

C100-19 (FP1+) - A24-10 (E1)

G - W-B

Fuel pump assembly (for high pressure side) signal

Idling with warm engine, Data List item "Injection Mode" displaying "Direct"

Pulse generation

(See waveform 12)

C100-18 (FP1-) - A24-10 (E1)

L - W-B

Fuel pump assembly (for high pressure side) signal

Idling with warm engine, Data List item "Injection Mode" displaying "Direct"

Pulse generation

(See waveform 12)

C100-21 (VOP+) - A24-10 (E1)

G - W-B

Oil pressure control valve operation signal

Idling with warm engine

Pulse generation

(See waveform 13)

C100-20 (VOP-) - A24-10 (E1)

P - W-B

Oil pressure control valve operation signal

Idling with warm engine

Pulse generation

(See waveform 13)

C100-26 (OE1+) - C100-25 (OE1-)

P - L

Cam timing oil control solenoid assembly operation signal

Idling

Pulse generation

(See waveform 14)

C100-28 (EDT1) - A24-10 (E1)

P - W-B

Cam timing control motor with EDU assembly signal

Idling with warm engine

Pulse generation

(See waveform 15)

C100-41 (WSV2) - A24-10 (E1)

LG - W-B

Flow shutting valve (for ATF control) operation signal

Ignition switch ON

11 to 14 V

C100-42 (WSV1) - A24-10 (E1)

W - W-B

Flow shutting valve (for heater control) operation signal

Ignition switch ON

11 to 14 V

C100-44 (ACM) - A24-10 (E1)

G - W-B

Vacuum switching valve (for active control engine mount system) operation signal

Ignition switch ON

11 to 14 V

C100-46 (IGT4) - A24-10 (E1)

B - W-B

No. 4 ignition coil assembly signal

(ignition signal)

Idling with warm engine

Pulse generation

(See waveform 16)

C100-47 (IGT3) - A24-10 (E1)

P - W-B

No. 3 ignition coil assembly signal

(ignition signal)

Idling with warm engine

Pulse generation

(See waveform 16)

C100-48 (IGT2) - A24-10 (E1)

V - W-B

No. 2 ignition coil assembly signal

(ignition signal)

Idling with warm engine

Pulse generation

(See waveform 16)

C100-49 (IGT1) - A24-10 (E1)

W - W-B

No. 1 ignition coil assembly signal

(ignition signal)

Idling with warm engine

Pulse generation

(See waveform 16)

C100-50 (WPO) - A24-10 (E1)

LG - W-B

Electric water pump assembly signal

Idling with warm engine

Pulse generation

(See waveform 17)

C100-51 (WPI) - A24-10 (E1)

B - W-B

Electric water pump assembly signal

Idling with warm engine

Pulse generation

(See waveform 18)

C100-66 (PRG) - A24-10 (E1)

P - W-B

Purge VSV operation signal

Ignition switch ON

11 to 14 V

Idling with warm engine, under purge control

Pulse generation

(See waveform 19)

C100-70 (EMR1) - A24-10 (E1)

LG - W-B

Cam timing control motor with EDU assembly signal

Idling with warm engine

Pulse generation

(See waveform 20)

C100-71 (EMF1) - A24-10 (E1)

B - W-B

Cam timing control motor with EDU assembly signal

Idling with warm engine

Below 5.0 V

C100-72 (EMD1) - A24-10 (E1)

L - W-B

Cam timing control motor with EDU assembly signal

Idling with warm engine

Pulse generation

(See waveform 21)

C100-73 (#40) - A24-10 (E1)

P - W-B

Port fuel injector assembly signal (No. 4 cylinder)

Idling with warm engine (Data List item "Injection Mode" displaying "Port")

Pulse generation

(See waveform 22)

C100-74 (#30) - A24-10 (E1)

W - W-B

Port fuel injector assembly signal (No. 3 cylinder)

Idling with warm engine (Data List item "Injection Mode" displaying "Port")

Pulse generation

(See waveform 22)

C100-75 (#20) - A24-10 (E1)

G - W-B

Port fuel injector assembly signal (No. 2 cylinder)

Idling with warm engine (Data List item "Injection Mode" displaying "Port")

Pulse generation

(See waveform 22)

C100-76 (#10) - A24-10 (E1)

B - W-B

Port fuel injector assembly signal (No. 1 cylinder)

Idling with warm engine (Data List item "Injection Mode" displaying "Port")

Pulse generation

(See waveform 22)

C100-78 (VCVG) - A24-10 (E1)

R - W-B

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

Ignition switch ON

4.8 to 5.2 V

C100-84 (VCPF) - A24-10 (E1)

LG - W-B

Power source of fuel pressure sensor (fuel delivery pipe with sensor sub-assembly) (for low pressure side) (specific voltage)

Ignition switch ON

4.5 to 5.5 V

C100-87 (VTA2) - C100-110 (ETA)

V - G

Throttle position sensor signal (for sensor malfunction detection)

Ignition switch ON, accelerator pedal fully released

2.1 to 3.1 V

Accelerator pedal fully depressed (engine running)

4.6 to 5.0 V

C100-88 (VCV1) - A24-10 (E1)

L - W-B

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

Ignition switch ON

4.5 to 5.5 V

C100-90 (VV1+) - C100-89 (VV1-)

B - LG

Camshaft position sensor (for intake camshaft) signal

Idling with warm engine

Pulse generation

(See waveform 23)

C100-91 (EV1+) - C100-114 (EV1-)

V - G

Camshaft position sensor (for exhaust camshaft) signal

Idling with warm engine

Pulse generation

(See waveform 23)

C100-93 (NE+) - C100-115 (NE-)

L - P

Crankshaft position sensor signal

Idling with warm engine

Pulse generation

(See waveform 24)

C100-94 (A1A-) - A24-10 (E1)

G - W-B

Air fuel ratio sensor (sensor 1) signal

Ignition switch ON

1.24 to 4.22 V

C100-95 (A1A+) - A24-10 (E1)

R - W-B

Air fuel ratio sensor (sensor 1) signal

Ignition switch ON

1.46 to 4.22 V

C100-97 (PR) - C100-96 (EPR)

L - V

Fuel pressure sensor (for high pressure side) signal

Idling with warm engine

0.5 to 4.5 V

C100-98 (VCPR) - C100-96 (EPR)

LG - V

Power source of fuel pressure sensor (for high pressure side) (specific voltage)

Ignition switch ON

4.75 to 5.25 V

C100-99 (VCPE) - C100-100 (EPEO)

R - G

Power source of oil pressure and temperature sensor (specific voltage)

Ignition switch ON

4.5 to 5.5 V

C100-101 (VG) - C100-79 (E2G)

W - G

Mass air flow meter sub-assembly signal

Ignition switch ON

Pulse generation

(See waveform 25)

C100-102 (THA) - C100-79 (E2G)

V - G

Intake air temperature sensor (mass air flow meter sub-assembly) signal

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

0.5 to 3.4 V

C100-107 (PFL) - C100-61 (EPFL)

V - L

Fuel pressure sensor (fuel delivery pipe with sensor sub-assembly) (for low pressure side) signal

Idling with warm engine

0.75 to 4.5 V

C100-108 (VTA1) - C100-110 (ETA)

P - G

Throttle position sensor signal (for engine control)

Ignition switch ON, accelerator pedal fully released

0.6 to 1.1 V

Accelerator pedal fully depressed (engine running)

3.2 to 4.8 V

C100-109 (VCTA) - C100-110 (ETA)

R - G

Power source of throttle position sensor (specific voltage)

Ignition switch ON

4.5 to 5.5 V

C100-111 (KNK1) - C100-112 (EKNK)

B - W

Knock control sensor signal

Engine speed maintained at 4000 rpm after warming up engine

Pulse generation

(See waveform 26)

C100-113 (VCE1) - A24-10 (E1)

L - W-B

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

Ignition switch ON

4.5 to 5.5 V

C100-116 (VCNE) - A24-10 (E1)

V - W-B

Power source of crankshaft position sensor (specific voltage)

Ignition switch ON

4.5 to 5.5 V

C100-117 (A1B-) - A24-10 (E1)

W - W-B

Air fuel ratio sensor (sensor 2) signal

Ignition switch ON

1.17 to 4.49 V

C100-118 (A1B+) - A24-10 (E1)

B - W-B

Air fuel ratio sensor (sensor 2) signal

Ignition switch ON

1.53 to 5.96 V

C100-120 (PIM) - C100-119 (EPIM)

P - G

Manifold absolute pressure sensor signal

Ignition switch ON

3.0 to 4.5 V

C100-121 (VCPM) - C100-119 (EPIM)

B - G

Power source of manifold absolute pressure sensor (specific voltage)

Ignition switch ON

4.75 to 5.25 V

C100-122 (PEO) - C100-100 (EPEO)

W - L

Oil pressure sensor signal

Idling with warm engine

0.5 to 4.5 V

C100-123 (THEO) - C100-100 (EPEO)

V - L

Engine oil temperature sensor signal

Ignition switch ON

0.14 to 4.93 V

C100-125 (THW) - C100-124 (ETHW)

L - P

Engine coolant temperature sensor signal

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

0.2 to 1.0 V

*1: w/o Smart Key System

*2: w/ Smart Key System

*3: w/ Drive Mode Switch

WAVEFORM 1

CAN Communication Signal (Reference)

ECM Terminal Name

Between CANH and E1

Tester Range

1 V/DIV., 10 μs./DIV.

Condition

Engine stopped, ignition switch ON

HINT:

The waveform varies depending on the CAN communication signal.

WAVEFORM 2

Engine Speed Signal

ECM Terminal Name

Between NEO and E1

Tester Range

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

Condition

Idling with warm engine

HINT:

The wavelength becomes shorter as the engine speed increases.

WAVEFORM 3

CAN Communication Signal (Reference)

ECM Terminal Name

Between CANL and E1

Tester Range

1 V/DIV., 10 μs./DIV.

Condition

Engine stopped, ignition switch ON

HINT:

The waveform varies depending on the CAN communication signal.

WAVEFORM 4

Cooling Fan Control Signal

ECM Terminal Name

Between RFC and E1

Tester Range

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

Condition

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

HINT:

The duty ratio varies depending on the engine coolant temperature.

WAVEFORM 5

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 6

Throttle Actuator Operation Signal (Negative Terminal)

ECM Terminal Name

Between M- and E1

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 7

Throttle Actuator Operation Signal (Positive Terminal)

ECM Terminal Name

Between M+ and E1

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

EGR Valve Assembly Operation Signal

ECM Terminal Name

CH1: Between EGA+ and E1

CH2: Between EGA- and E1

CH1: Between EGB+ and E1

CH2: Between EGB- and E1

Tester Range

5 V/DIV., 5 μs./DIV.

Condition

Idling with warm engine

HINT:

When the EGR valve assembly is operating, a waveform is produced at each terminal.

WAVEFORM 9

Air Fuel Ratio Sensor (Sensor 2) Heater Operation Signal

ECM Terminal Name

Between HA1B and E1

Tester Range

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

Condition

Idling with cold engine

WAVEFORM 10

Air Fuel Ratio Sensor (Sensor 1) Heater Operation Signal

ECM Terminal Name

Between HA1A and E1

Tester Range

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

Condition

Idling with cold engine

WAVEFORM 11

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

ECM Terminal Name

CH1: Between #1D+ and E1

CH2: Between #1D- and E1

CH1: Between #2D+ and E1

CH2: Between #2D- and E1

CH1: Between #3D+ and E1

CH2: Between #3D- and E1

CH1: Between #4D+ and E1

CH2: Between #4D- and E1

Tester Range

50 V/DIV., 200 μs./DIV.

Condition

Idling with warm engine, Data List item "Injection Mode" displaying "Direct"

WAVEFORM 12

Fuel Pump Assembly (for High Pressure Side) Signal

ECM Terminal Name

CH1: Between FP1+ and E1

CH2: Between FP1- and E1

Tester Range

20 V/DIV., 500 μs./DIV.

Condition

Idling with warm engine, Data List item "Injection Mode" displaying "Direct"

WAVEFORM 13

Oil Pressure Control Valve Operation Signal

ECM Terminal Name

CH1: Between VOP+ and E1

CH2: Between VOP- and E1

Tester Range

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

Condition

Idling with warm engine

WAVEFORM 14

Cam Timing Oil Control Solenoid Assembly Operation Signal

ECM Terminal Name

Between OE1+ and OE1-

Tester Range

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

Condition

Idling

WAVEFORM 15

Cam Timing Control Motor with EDU Assembly Signal (EDT Signal)

ECM Terminal Name

Between EDT1 and E1

Tester Range

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

Condition

Idling with warm engine

WAVEFORM 16

Ignition Coil Assembly Signal (IGT Signal)

ECM Terminal Name

Between IGT (1 to 4) and E1

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

Engine Water Pump Assembly Signal (from ECM to Engine Water Pump Assembly)

ECM Terminal Name

Between WPO and E1

Tester Range

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

Condition

Idling with warm engine

HINT:

The duty ratio varies depending on the engine water pump assembly speed.

WAVEFORM 18

Engine Water Pump Assembly Signal (from Engine Water Pump Assembly to ECM)

ECM Terminal Name

Between WPI and E1

Tester Range

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

Condition

Idling with warm engine

HINT:

The wavelength becomes shorter as the engine water pump assembly speed increases.

WAVEFORM 19

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 20

Cam Timing Control Motor with EDU Assembly Signal (EMR Signal)

ECM Terminal Name

Between EMR1 and E1

Tester Range

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

Condition

Idling with warm engine

HINT:

The wavelength becomes shorter as the engine speed increases.

WAVEFORM 21

Cam Timing Control Motor with EDU Assembly Signal (EMD Signal)

ECM Terminal Name

Between EMD1 and E1

Tester Range

2 V/DIV., 100 ms./DIV.

Condition

Idling with warm engine

WAVEFORM 22

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

ECM Terminal Name

Between #10 (to #40) and E1

Tester Range

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

Condition

Idling with warm engine (Data List item "Injection Mode" displaying "Port")

HINT:

  • The wavelength becomes shorter as the engine speed increases.
  • When the port injection injectors are operating, Port is displayed for Injection Mode of the Data List.

WAVEFORM 23

Camshaft 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 24

Crankshaft Position Sensor Signal

ECM Terminal Name

Between NE+ and NE-

Tester Range

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

Condition

Idling with warm engine

HINT:

The wavelength becomes shorter as the engine speed increases.

WAVEFORM 25

Mass Air Flow Meter Sub-assembly Signal

ECM Terminal Name

Between VG and E2G

Tester Range

1 V/DIV., 100 μs./DIV.

Condition

Ignition switch ON

WAVEFORM 26

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.