Lexus ES manuals

Lexus ES: Terminals Of Ecm

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

A28-1 (BATT) - A28-10 (E1)

G - W-B

Battery (for measuring battery voltage and ECM memory)

Always

11 to 14 V

A28-2 (IGSW) - A28-10 (E1)

B - W-B

Engine switch signal

Engine switch on (IG)

11 to 14 V

A28-3 (VPMP) - A28-10 (E1)

L - W-B

Vent valve (built into canister pump module)

Engine switch on (IG)

11 to 14 V

A28-5 (MPMP) - A28-10 (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

A28-6 (FPC) - A28-10 (E1)

R - W-B

Fuel pump control

Engine switch on (IG)

Below 1.5 V

A28-8 (CANH) - A28-10 (E1)

B - W-B

CAN communication line

Engine stopped, engine switch on (IG)

Pulse generation

(See waveform 1)

A28-9 (+B) - A28-10 (E1)

L - W-B

  • Power source of ECM
  • Power source of throttle actuator

Engine switch on (IG)

11 to 14 V

A28-10 (E1) - Body ground

W-B - -

Ground

Always

Below 1 Ω

A28-12 (PWMS) - A28-10 (E1)

LG - W-B

Drive mode switch (SPORT mode)

Engine switch on (IG)

11 to 14 V

Engine switch on (IG), SPORT mode switch being pushed and held at SPORT position (SPORT mode)

0 to 1.5 V

A28-13 (SPCN) - A28-10 (E1)

P - W-B

Drive mode switch (NORMAL mode)

Engine switch on (IG)

11 to 14 V

Engine switch on (IG), NORMAL mode switch being pushed and held (NORMAL mode)

0 to 1.5 V

A28-14 (S) - A28-10 (E1)

GR - W-B

S shift position switch signal

Engine switch on (IG), shift lever in S

11 to 14 V

Engine switch on (IG), shift lever not in S

Below 1.5 V

A28-15 (MREL) - A28-10 (E1)

W - W-B

EFI-MAIN NO. 1 relay operation signal

Engine switch on (IG)

Below 1.5 V

A28-16 (NEO) - A28-10 (E1)

B - W-B

Engine speed signal sent to other ECUs

Idling with warm engine

Pulse generation

(See waveform 2)

A28-18 (CANL) - A28-10 (E1)

W - W-B

CAN communication line

Engine stopped, engine switch on (IG)

Pulse generation

(See waveform 3)

A28-21 (STP) - A28-10 (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

A28-22 (ST1-) - A28-10 (E1)

LG - W-B

Stop light switch assembly signal

(opposite to STP terminal)

Engine switch on (IG), brake pedal depressed

0 to 1.5 V

Engine switch on (IG), brake pedal released

7.5 to 14 V

A28-23 (NSW) - A28-10 (E1)

BE - W-B

Park/Neutral position switch assembly signal

Engine switch on (IG), shift lever not in P or N

11 to 14 V

Engine switch on (IG), shift lever in P or N

Below 3.0 V

A28-30 (STA) - A28-10 (E1)

G - W-B

Starter assembly signal

Cranking

6.0 V or higher

A28-32 (RFC) - A28-10 (E1)

LG - W-B

Cooling fan control signal

Engine switch on (IG), A/C switch on (max cool)

Pulse generation

(See waveform 4)

A28-34 (IREL) - A28-10 (E1)

P - W-B

D INJ relay operation signal

Engine switch on (IG)

Below 1.5 V

A28-35 (+B2) - A28-10 (E1)

L - W-B

Power source of ECM

Engine switch on (IG)

11 to 14 V

A28-36 (E2) - Body ground

W-B - -

Ground

Always

Below 1 Ω

A28-39 (KSW) - A28-10 (E1)

R - W-B

Electrical key in vehicle signal

Electrical key outside vehicle

11 to 14 V

A28-42 (SPD) - A28-10 (E1)

L - W-B

Vehicle speed signal from combination meter assembly

Driving at 20 km/h (12 mph)

Pulse generation

(See waveform 5)

A28-45 (EC) - Body ground

W-B - -

Ground

Always

Below 1 Ω

A28-48 (VCPP) - A28-49 (EPPM)

V - LG

Power source for canister pressure sensor (specific voltage)

Engine switch on (IG)

4.5 to 5.5 V

A28-50 (PPMP) - A28-49 (EPPM)

BE - LG

Canister pressure sensor (built into canister pump module)

Engine switch on (IG)

3.0 to 3.6 V

A28-53 (+BD1) - A28-10 (E1)

W - W-B

Power source of ECU (injector driver)

Engine switch on (IG)

11 to 14 V

A28-54 (E1D1) - Body ground

W-B - -

Ground

Always

Below 1 Ω

A28-55 (VPA) - A28-56 (EPA)

G - L

Accelerator pedal position sensor signal (for engine control)

Engine switch on (IG), accelerator pedal fully released

0.5 to 1.1 V

Engine switch on (IG), accelerator pedal fully depressed

2.6 to 4.5 V

A28-57 (VCPA) - A28-56 (EPA)

BE - L

Power source of accelerator pedal position sensor (for VPA)

Engine switch on (IG)

4.5 to 5.5 V

A28-58 (VPA2) - A28-59 (EPA2)

GR - P

Accelerator pedal position sensor signal

Engine switch on (IG), accelerator pedal fully released

1.2 to 2.0 V

Engine switch on (IG), accelerator pedal fully depressed

3.4 to 4.75 V

A28-60 (VCP2) - A28-59 (EPA2)

SB - P

Power source of accelerator pedal position sensor (for VPA2)

Engine switch on (IG)

4.5 to 5.5 V

C78-23 (D) - A28-10 (E1)

R - W-B

D shift position switch signal

Engine switch on (IG), shift lever in D or S

11 to 14 V

Engine switch on (IG), shift lever not in D or S

Below 1 V

C78-24 (N) - A28-10 (E1)

LG - W-B

N shift position switch signal

Engine switch on (IG), shift lever in N

11 to 14 V

Engine switch on (IG), shift lever not in N

Below 1 V

C78-25 (R) - A28-10 (E1)

W - W-B

R shift position switch signal

Engine switch on (IG), shift lever in R

11 to 14 V

Engine switch on (IG), shift lever not in R

Below 1 V

C78-26 (P) - A28-10 (E1)

B - W-B

P shift position switch signal

Engine switch on (IG), shift lever in P

11 to 14 V

Engine switch on (IG), shift lever not in P

Below 1 V

C77-1 (M-) - A28-10 (E1)

L - W-B

Throttle actuator operation signal (negative signal)

Idling with warm engine

Pulse generation

(See waveform 6)

C77-2 (M+) - A28-10 (E1)

B - W-B

Throttle actuator operation signal (positive terminal)

Idling with warm engine

Pulse generation

(See waveform 7)

C77-3 (EGA+) - A28-10 (E1)

R - W-B

EGR valve assembly operation signal

Idling with warm engine

Pulse generation

(See waveform 8)

C77-4 (EGA-) - A28-10 (E1)

L - W-B

EGR valve assembly operation signal

Idling with warm engine

Pulse generation

(See waveform 8)

C77-6 (EGB+) - A28-10 (E1)

GR - W-B

EGR valve assembly operation signal

Idling with warm engine

Pulse generation

(See waveform 8)

C77-5 (EGB-) - A28-10 (E1)

V - W-B

EGR valve assembly operation signal

Idling with warm engine

Pulse generation

(See waveform 8)

C77-7 (HTHM) - A28-10 (E1)

G - W-B

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

Engine switch on (IG)

11 to 14 V

C77-8 (HA1B) - A28-10 (E1)

R - W-B

Air fuel ratio sensor (sensor 2) heater operation signal

Engine switch on (IG)

11 to 14 V

Idling with cold engine

Pulse generation

(See waveform 9)

C77-9 (HA1A) - A28-10 (E1)

L - W-B

Air fuel ratio sensor (sensor 1) heater operation signal

Engine switch on (IG)

11 to 14 V

Idling with cold engine

Pulse generation

(See waveform 10)

C77-11 (#2D+) - A28-10 (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)

C77-10 (#2D-) - A28-10 (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)

C77-12 (#3D+) - A28-10 (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)

C77-13 (#3D-) - A28-10 (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)

C77-15 (#4D+) - A28-10 (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)

C77-14 (#4D-) - A28-10 (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)

C77-16 (#1D+) - A28-10 (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)

C77-17 (#1D-) - A28-10 (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)

C77-19 (FP1+) - A28-10 (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)

C77-18 (FP1-) - A28-10 (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)

C77-21 (VOP+) - A28-10 (E1)

G - W-B

Oil pressure control valve operation signal

Idling with warm engine

Pulse generation

(See waveform 13)

C77-20 (VOP-) - A28-10 (E1)

P - W-B

Oil pressure control valve operation signal

Idling with warm engine

Pulse generation

(See waveform 13)

C77-26 (OE1+) - C77-25 (OE1-)

P - L

Cam timing oil control solenoid assembly operation signal

Idling

Pulse generation

(See waveform 14)

C77-28 (EDT1) - A28-10 (E1)

P - W-B

Cam timing control motor with EDU assembly signal

Idling with warm engine

Pulse generation

(See waveform 15)

C77-41 (WSV2) - A28-10 (E1)

LG - W-B

Flow shutting valve (for ATF control) operation signal

Engine switch on (IG)

11 to 14 V

C77-42 (WSV1) - A28-10 (E1)

W - W-B

Flow shutting valve (for heater control) operation signal

Engine switch on (IG)

11 to 14 V

C77-44 (ACM) - A28-10 (E1)

G - W-B

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

Engine switch on (IG)

11 to 14 V

C77-46 (IGT4) - A28-10 (E1)

B - W-B

No. 4 ignition coil assembly signal

(ignition signal)

Idling with warm engine

Pulse generation

(See waveform 16)

C77-47 (IGT3) - A28-10 (E1)

P - W-B

No. 3 ignition coil assembly signal

(ignition signal)

Idling with warm engine

Pulse generation

(See waveform 16)

C77-48 (IGT2) - A28-10 (E1)

V - W-B

No. 2 ignition coil assembly signal

(ignition signal)

Idling with warm engine

Pulse generation

(See waveform 16)

C77-49 (IGT1) - A28-10 (E1)

W - W-B

No. 1 ignition coil assembly signal

(ignition signal)

Idling with warm engine

Pulse generation

(See waveform 16)

C77-50 (WPO) - A28-10 (E1)

LG - W-B

Electric water pump assembly signal

Idling with warm engine

Pulse generation

(See waveform 17)

C77-51 (WPI) - A28-10 (E1)

B - W-B

Electric water pump assembly signal

Idling with warm engine

Pulse generation

(See waveform 18)

C77-66 (PRG) - A28-10 (E1)

P - W-B

Purge VSV operation signal

Engine switch on (IG)

11 to 14 V

Idling with warm engine, under purge control

Pulse generation

(See waveform 19)

C77-70 (EMR1) - A28-10 (E1)

LG - W-B

Cam timing control motor with EDU assembly signal

Idling with warm engine

Pulse generation

(See waveform 20)

C77-71 (EMF1) - A28-10 (E1)

B - W-B

Cam timing control motor with EDU assembly signal

Idling with warm engine

Below 5.0 V

C77-72 (EMD1) - A28-10 (E1)

L - W-B

Cam timing control motor with EDU assembly signal

Idling with warm engine

Pulse generation

(See waveform 21)

C77-73 (#40) - A28-10 (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)

C77-74 (#30) - A28-10 (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)

C77-75 (#20) - A28-10 (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)

C77-76 (#10) - A28-10 (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)

C77-78 (VCVG) - A28-10 (E1)

R - W-B

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

Engine switch on (IG)

4.8 to 5.2 V

C77-84 (VCPF) - A28-10 (E1)

LG - W-B

Power source of No. 2 fuel pressure sensor (for low pressure side) (specific voltage)

Engine switch on (IG)

4.5 to 5.5 V

C77-87 (VTA2) - C77-110 (ETA)

V - G

Throttle position sensor signal (for sensor malfunction detection)

Engine switch on (IG), accelerator pedal fully released

2.1 to 3.1 V

Accelerator pedal fully depressed (engine running)

4.6 to 5.0 V

C77-88 (VCV1) - A28-10 (E1)

L - W-B

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

Engine switch on (IG)

4.5 to 5.5 V

C77-90 (VV1+) - C77-89 (VV1-)

B - LG

Camshaft position sensor (for intake camshaft) signal

Idling with warm engine

Pulse generation

(See waveform 23)

C77-91 (EV1+) - C77-114 (EV1-)

V - G

Camshaft position sensor (for exhaust camshaft) signal

Idling with warm engine

Pulse generation

(See waveform 23)

C77-93 (NE+) - C77-115 (NE-)

L - P

Crankshaft position sensor signal

Idling with warm engine

Pulse generation

(See waveform 24)

C77-94 (A1A-) - A28-10 (E1)

G - W-B

Air fuel ratio sensor (sensor 1) signal

Engine switch on (IG)

1.24 to 4.22 V

C77-95 (A1A+) - A28-10 (E1)

R - W-B

Air fuel ratio sensor (sensor 1) signal

Engine switch on (IG)

1.46 to 4.22 V

C77-97 (PR) - C77-96 (EPR)

L - V

Fuel pressure sensor (for high pressure side) signal

Idling with warm engine

0.5 to 4.5 V

C77-98 (VCPR) - C77-96 (EPR)

LG - V

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

Engine switch on (IG)

4.75 to 5.25 V

C77-99 (VCPE) - C77-100 (EPEO)

R - L

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

Engine switch on (IG)

4.5 to 5.5 V

C77-101 (VG) - C77-79 (E2G)

W - G

Mass air flow meter sub-assembly signal

Engine switch on (IG)

Pulse generation

(See waveform 25)

C77-102 (THA) - C77-79 (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

C77-107 (PFL) - C77-61 (EPFL)

V - L

No. 2 fuel pressure sensor (for low pressure side) signal

Idling with warm engine

0.75 to 4.5 V

C77-108 (VTA1) - C77-110 (ETA)

P - G

Throttle position sensor signal (for engine control)

Engine switch on (IG), accelerator pedal fully released

0.6 to 1.1 V

Accelerator pedal fully depressed (engine running)

3.2 to 4.8 V

C77-109 (VCTA) - C77-110 (ETA)

R - G

Power source of throttle position sensor (specific voltage)

Engine switch on (IG)

4.5 to 5.5 V

C77-111 (KNK1) - C77-112 (EKNK)

B - W

Knock control sensor signal

Engine speed maintained at 4000 rpm after warming up engine

Pulse generation

(See waveform 26)

C77-113 (VCE1) - A28-10 (E1)

L - W-B

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

Engine switch on (IG)

4.5 to 5.5 V

C77-116 (VCNE) - A28-10 (E1)

V - W-B

Power source of crankshaft position sensor (specific voltage)

Engine switch on (IG)

4.5 to 5.5 V

C77-117 (A1B-) - A28-10 (E1)

W - W-B

Air fuel ratio sensor (sensor 2) signal

Engine switch on (IG)

1.17 to 4.49 V

C77-118 (A1B+) - A28-10 (E1)

B - W-B

Air fuel ratio sensor (sensor 2) signal

Engine switch on (IG)

1.53 to 5.96 V

C77-120 (PIM) - C77-119 (EPIM)

P - G

Manifold absolute pressure sensor signal

Engine switch on (IG)

3.0 to 4.5 V

C77-121 (VCPM) - C77-119 (EPIM)

B - G

Power source of manifold absolute pressure sensor (specific voltage)

Engine switch on (IG)

4.75 to 5.25 V

C77-122 (PEO) - C77-100 (EPEO)

W - L

Oil pressure sensor signal

Idling with warm engine

0.5 to 4.5 V

C77-123 (THEO) - C77-100 (EPEO)

V - L

Engine oil temperature sensor signal

Engine switch on (IG)

0.14 to 4.93 V

C77-125 (THW) - C77-124 (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

WAVEFORM 1

CAN Communication Signal (Reference)

ECM Terminal Name

Between CANH and E1

Tester Range

1 V/DIV., 10 μs./DIV.

Condition

Engine stopped, engine switch on (IG)

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, engine switch on (IG)

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

Engine switch on (IG), 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

Engine switch on (IG)

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.

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