Toyota Avalon Service & Repair Manual: 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

A19-1 (BATT) - A19-10 (E1)

G - W-B

Auxiliary battery (for measuring auxiliary battery voltage and ECM memory)

Always

11 to 16 V

A19-2 (IGSW) - A19-10 (E1)

B - W-B

Power switch signal

Power switch on (IG)

11 to 14 V

A19-3 (VPMP) - A19-10 (E1)

L - W-B

Vent valve (built into canister pump module)

Power switch on (IG)

11 to 14 V

A19-5 (MPMP) - A19-10 (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

A19-6 (FPC) - A19-10 (E1)

R - W-B

Fuel pump control

Engine stopped, power switch on (IG)

Below 1.5 V

A19-7 (CAN+) - A19-10 (E1)

P - W-B

CAN communication line

Engine stopped, power switch on (IG)

Pulse generation

(See waveform 1)

A19-8 (CANH) - A19-10 (E1)

B - W-B

CAN communication line

Engine stopped, power switch on (IG)

Pulse generation

(See waveform 1)

A19-9 (+B) - A19-10 (E1)

L - W-B

  • Power source of ECM
  • Power source of throttle actuator

Power switch on (IG)

11 to 14 V

A19-10 (E1) - Body ground

W-B - -

Ground

Always

Below 1 Ω

A19-12 (CCV2) - A19-10 (E1)

BE - W-B

Fuel vapor containment valve assembly signal

Fuel vapor containment valve assembly on (open)

Below 1.0 V

Fuel vapor containment valve assembly off (closed)

11 to 14 V

A19-15 (MREL) - A19-10 (E1)

W - W-B

EFI-MAIN NO. 1 relay operation signal

Power switch on (IG)

Below 1.5 V

A19-16 (NEO) - A19-10 (E1)

B - W-B

Crankshaft revolution signal

Idling with warm engine

Pulse generation

(See waveform 2)

A19-17 (CAN-) - A19-10 (E1)

W - W-B

CAN communication line

Engine stopped, power switch on (IG)

Pulse generation

(See waveform 3)

A19-18 (CANL) - A19-10 (E1)

W - W-B

CAN communication line

Engine stopped, power switch on (IG)

Pulse generation

(See waveform 3)

A19-24 (G2O) - A19-10 (E1)

W - W-B

Camshaft revolution signal

Idling with warm engine

Pulse generation

(See waveform 4)

A19-31 (LIDO) - A19-10 (E1)

GR - W-B

Fuel lid courtesy switch signal

Fuel lid closed

Below 1.0 V

Fuel lid open

11 to 14 V

A19-32 (RFC) - A19-10 (E1)

LG - W-B

Cooling fan control signal

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

Pulse generation

(See waveform 5)

A19-34 (IREL) - A19-10 (E1)

P - W-B

D INJ relay operation signal

Power switch on (IG)

11 to 14 V

A19-35 (+B2) - A19-10 (E1)

L - W-B

Power source of ECM

Power switch on (IG)

11 to 14 V

A19-36 (E2) - Body ground

W-B - -

Ground

Always

Below 1 Ω

A19-38 (FUEL) - A19-10 (E1)

G - W-B

Fuel lid opener switch signal

Fuel lid opener switch pressed

Below 1.0 V

Fuel lid opener switch not pressed

4.5 to 5.5 V

A19-45 (EC) - Body ground

W-B - -

Ground

Always

Below 1 Ω

A19-41 (LSTM) - A19-10 (E1)

B - W-B

Fuel lid operation signal for combination meter assembly

Multi-information display displaying "Close Fuel Lid"

Pulse generation

(See waveform 6)

Multi-information display displaying "Ready to Refuel"

Pulse generation

(See waveform 7)

Power switch on (IG)

11 to 14 V

A19-44 (FREL) - A19-10 (E1)

Y - W-B

Fuel lid lock with motor assembly operation signal

Fuel lid lock with motor assembly operating

Below 1.0 V

Fuel lid lock with motor assembly not operating

11 to 14 V

A19-48 (VCPP) - A19-49 (EPPM)

B - LG

Power source for canister pressure sensor (specific voltage)

Power switch on (IG)

4.5 to 5.5 V

A19-50 (PPMP) - A19-49 (EPPM)

P - LG

Canister pressure sensor (built into canister pump module)

Power switch on (IG)

3.0 to 3.6 V

A19-53 (+BD1) - A19-10 (E1)

W - W-B

Power source of ECU (injector driver)

Power switch on (IG)

11 to 14 V

A19-54 (E1D1) - Body ground

W-B - -

Ground

Always

Below 1 Ω

A19-57 (VPTK) - A19-56 (EPTK)

L - G

Power source of fuel tank pressure sensor (specific voltage)

Engine stopped, power switch on (IG)

4.75 to 5.25 V

A19-55 (PTNK) - A19-56 (EPTK)

R - G

Fuel tank pressure sensor signal

Engine stopped, power switch on (IG)

0.27 to 4.73 V

C55-1 (M-) - A19-10 (E1)

L - W-B

Throttle actuator operation signal (negative signal)

Idling with warm engine

Pulse generation

(See waveform 8)

C55-2 (M+) - A19-10 (E1)

B - W-B

Throttle actuator operation signal (positive terminal)

Idling with warm engine

Pulse generation

(See waveform 9)

C55-3 (EGA+) - A19-10 (E1)

R - W-B

EGR valve assembly operation signal

Idling with warm engine

Pulse generation

(See waveform 10)

C55-4 (EGA-) - A19-10 (E1)

L - W-B

EGR valve assembly operation signal

Idling with warm engine

Pulse generation

(See waveform 10)

C55-5 (EGB-) - A19-10 (E1)

V - W-B

EGR valve assembly operation signal

Idling with warm engine

Pulse generation

(See waveform 10)

C55-6 (EGB+) - A19-10 (E1)

GR - W-B

EGR valve assembly operation signal

Idling with warm engine

Pulse generation

(See waveform 10)

C55-7 (HTHM) - A19-10 (E1)

LA-G - W-B

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

Power switch on (IG)

11 to 14 V

C55-8 (HA1B) - A19-10 (E1)

R - W-B

Air fuel ratio sensor (sensor 2) heater operation signal

Power switch on (IG)

11 to 14 V

Idling with cold engine

Pulse generation

(See waveform 11)

C55-9 (HA1A) - A19-10 (E1)

L - W-B

Air fuel ratio sensor (sensor 1) heater operation signal

Power switch on (IG)

11 to 14 V

Idling with cold engine

Pulse generation

(See waveform 12)

C55-10 (#2D-) - A19-10 (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 13)

C55-11 (#2D+) - A19-10 (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 13)

C55-12 (#3D+) - A19-10 (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 13)

C55-13 (#3D-) - A19-10 (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 13)

C55-14 (#4D-) - A19-10 (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 13)

C55-15 (#4D+) - A19-10 (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 13)

C55-16 (#1D+) - A19-10 (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 13)

C55-17 (#1D-) - A19-10 (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 13)

C55-18 (FP1-) - A19-10 (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 14)

C55-19 (FP1+) - A19-10 (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 14)

C55-20 (VOP-) - A19-10 (E1)

P - W-B

Oil pressure control valve operation signal

Idling with warm engine

Pulse generation

(See waveform 15)

C55-21 (VOP+) - A19-10 (E1)

G - W-B

Oil pressure control valve operation signal

Idling with warm engine

Pulse generation

(See waveform 15)

C55-26 (OE1+) - C55-25 (OE1-)

LA-B - LA-W

Cam timing oil control solenoid assembly operation signal

Idling

Pulse generation

(See waveform 16)

C55-28 (EDT1) - A19-10 (E1)

P - W-B

Cam timing control motor with EDU assembly signal

Idling with warm engine

Pulse generation

(See waveform 17)

C55-42 (WSV1) - A19-10 (E1)

LA-W - W-B

Flow shutting valve operation signal

Power switch on (IG)

11 to 14 V

C55-46 (IGT4) - A19-10 (E1)

B - W-B

No. 4 ignition coil assembly signal

(ignition signal)

Idling with warm engine

Pulse generation

(See waveform 18)

C55-47 (IGT3) - A19-10 (E1)

P - W-B

No. 3 ignition coil assembly signal

(ignition signal)

Idling with warm engine

Pulse generation

(See waveform 18)

C55-48 (IGT2) - A19-10 (E1)

V - W-B

No. 2 ignition coil assembly signal

(ignition signal)

Idling with warm engine

Pulse generation

(See waveform 18)

C55-49 (IGT1) - A19-10 (E1)

W - W-B

No. 1 ignition coil assembly signal

(ignition signal)

Idling with warm engine

Pulse generation

(See waveform 18)

C55-50 (WPO) - A19-10 (E1)

LA-G - W-B

Water inlet housing with water pump sub-assembly signal

Idling with warm engine

Pulse generation

(See waveform 19)

C55-51 (WPI) - A19-10 (E1)

LA-B - W-B

Water inlet housing with water pump sub-assembly signal

Idling with warm engine

Pulse generation

(See waveform 20)

C55-66 (PRG) - A19-10 (E1)

P - W-B

Purge VSV operation signal

Power switch on (IG)

11 to 14 V

Idling with warm engine, under purge control

Pulse generation

(See waveform 21)

C55-70 (EMR1) - A19-10 (E1)

LG - W-B

Cam timing control motor with EDU assembly signal

Idling with warm engine

Pulse generation

(See waveform 22)

C55-71 (EMF1) - A19-10 (E1)

B - W-B

Cam timing control motor with EDU assembly signal

Idling with warm engine

Below 5.0 V

C55-72 (EMD1) - A19-10 (E1)

L - W-B

Cam timing control motor with EDU assembly signal

Idling with warm engine

Pulse generation

(See waveform 23)

C55-73 (#40) - A19-10 (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 24)

C55-74 (#30) - A19-10 (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 24)

C55-75 (#20) - A19-10 (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 24)

C55-76 (#10) - A19-10 (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 24)

C55-78 (VCVG) - A19-10 (E1)

R - W-B

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

Power switch on (IG)

4.8 to 5.2 V

C55-84 (VCPF) - A19-10 (E1)

LG - W-B

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

Power switch on (IG)

4.75 to 5.25 V

C55-87 (VTA2) - C55-110 (ETA)

V - G

Throttle position sensor signal (for sensor malfunction detection)

Engine stopped, power switch on (IG), accelerator pedal fully released

2.1 to 3.1 V

C55-88 (VCV1) - A19-10 (E1)

L - W-B

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

Power switch on (IG)

4.5 to 5.5 V

C55-90 (VV1+) - C55-89 (VV1-)

B - LG

Camshaft position sensor (for intake camshaft) signal

Idling with warm engine

Pulse generation

(See waveform 25)

C55-91 (EV1+) - C55-114 (EV1-)

V - G

Camshaft position sensor (for exhaust camshaft) signal

Idling with warm engine

Pulse generation

(See waveform 25)

C55-93 (NE+) - C55-115 (NE-)

L - P

Crankshaft position sensor signal

Idling with warm engine

Pulse generation

(See waveform 26)

C55-94 (A1A-) - A19-10 (E1)

G - W-B

Air fuel ratio sensor (sensor 1) signal

Power switch on (IG)

1.24 to 4.22 V

C55-95 (A1A+) - A19-10 (E1)

R - W-B

Air fuel ratio sensor (sensor 1) signal

Power switch on (IG)

1.46 to 4.22 V

C55-97 (PR) - C55-96 (EPR)

L - V

Fuel pressure sensor (for high pressure side) signal

Idling with warm engine

0.5 to 4.5 V

C55-98 (VCPR) - C55-96 (EPR)

LG - V

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

Power switch on (IG)

4.75 to 5.25 V

C55-99 (VCPE) - C55-100 (EPEO)

R - G

Power source of engine oil pressure sensor (specific voltage)

Power switch on (IG)

4.5 to 5.5 V

C55-101 (VG) - C55-79 (E2G)

W - G

Mass air flow meter sub-assembly signal

Power switch on (IG)

Pulse generation

(See waveform 27)

C55-102 (THA) - C55-79 (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

C55-107 (PFL) - C55-61 (EPFL)

V - L

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

Idling with warm engine

0.75 to 4.5 V

C55-108 (VTA1) - C55-110 (ETA)

P - G

Throttle position sensor signal (for engine control)

Engine stopped, power switch on (IG), accelerator pedal fully released

0.6 to 1.1 V

C55-109 (VCTA) - C55-110 (ETA)

R - G

Power source of throttle position sensor (specific voltage)

Engine stopped, power switch on (IG)

4.5 to 5.5 V

C55-111 (KNK1) - C55-112 (EKNK)

B - W

Knock control sensor signal

Engine speed maintained at 2500 rpm after warming up engine

Pulse generation

(See waveform 28)

C55-113 (VCE1) - A19-10 (E1)

L - W-B

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

Power switch on (IG)

4.5 to 5.5 V

C55-116 (VCNE) - A19-10 (E1)

V - W-B

Power source of crankshaft position sensor (specific voltage)

Power switch on (IG)

4.5 to 5.5 V

C55-117 (A1B-) - A19-10 (E1)

W - W-B

Air fuel ratio sensor (sensor 2) signal

Power switch on (IG)

1.17 to 4.49 V

C55-118 (A1B+) - A19-10 (E1)

B - W-B

Air fuel ratio sensor (sensor 2) signal

Power switch on (IG)

1.53 to 5.96 V

C55-120 (PIM) - C55-119 (EPIM)

P - G

Manifold absolute pressure sensor signal

Power switch on (IG)

3.0 to 4.5 V

C55-121 (VCPM) - C55-119 (EPIM)

B - G

Power source of manifold absolute pressure sensor (specific voltage)

Power switch on (IG)

4.75 to 5.25 V

C55-122 (PEO) - C55-100 (EPEO)

W - G

Oil pressure sensor signal

Idling with warm engine

0.5 to 4.5 V

C55-123 (THEO) - C55-104 (ETHE)

V - W

Engine oil temperature sensor signal

Power switch on (IG)

0.14 to 4.93 V

C55-125 (THW) - C55-124 (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

C55-129 (THTW) - C55-130 (ETHT)

P - W

No. 2 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

Between CAN+ and E1

Tester Range

1 V/DIV., 10 μs./DIV.

Condition

Engine stopped, power switch on (IG)

HINT:

The waveform varies depending on the CAN communication signal.

WAVEFORM 2

Crankshaft Revolution Signal from ECM to Inverter with Converter Assembly

ECM Terminal Name

Between NEO 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 3

CAN Communication Signal (Reference)

ECM Terminal Name

Between CANL and E1

Between CAN- and E1

Tester Range

1 V/DIV., 10 μs./DIV.

Condition

Engine stopped, power switch on (IG)

HINT:

The waveform varies depending on the CAN communication signal.

WAVEFORM 4

Camshaft Revolution Signal from ECM to Inverter with Converter Assembly

ECM Terminal Name

Between G2O 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 5

Cooling Fan Control Signal

ECM Terminal Name

Between RFC and E1

Tester Range

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

Condition

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

HINT:

The duty ratio varies depending on the engine coolant temperature.

WAVEFORM 6

Fuel Lid Operation Signal for Combination Meter Assembly

ECM Terminal Name

Between LSTM and E1

Tester Range

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

Condition

Multi-information display displaying "Close Fuel Lid"

WAVEFORM 7

Fuel Lid Operation Signal for Combination Meter Assembly

ECM Terminal Name

Between LSTM and E1

Tester Range

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

Condition

Multi-information display displaying "Ready to Refuel"

WAVEFORM 8

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 9

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 10

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 11

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 12

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 13

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 14

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 15

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 16

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 17

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 18

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 19

Water Inlet Housing with Water Pump Sub-assembly Signal (from ECM to Water Inlet Housing with Water Pump Sub-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 water inlet housing with water pump sub-assembly speed.

WAVEFORM 20

Water Inlet Housing with Water Pump Sub-assembly Signal (from Water Inlet Housing with Water Pump Sub-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 water inlet housing with water pump sub-assembly speed increases.

WAVEFORM 21

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 22

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 23

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 24

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 25

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 26

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 27

Mass Air Flow Meter Sub-assembly Signal

ECM Terminal Name

Between VG and E2G

Tester Range

1 V/DIV., 100 μs./DIV.

Condition

Power switch on (IG)

WAVEFORM 28

Knock Control Sensor Signal

ECM Terminal Name

Between KNK1 and EKNK

Tester Range

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

Condition

Engine speed maintained at 2500 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.
    System Diagram

    Lost Communication with Drive Motor Control Module "A" Missing Message (U011087)

    See More:

    Toyota Avalon Service & Repair Manual > Electronically Controlled Brake System(for Gasoline Model): Diagnosis System
    DIAGNOSIS SYSTEM DESCRIPTION When troubleshooting a vehicle with a diagnosis system, the only difference from the usual troubleshooting procedure is connecting the Techstream to the vehicle and reading various data output from the skid control ECU (brake actuator assembly). The skid control ECU (bra ...

    Toyota Avalon Owners Manual

    Toyota Avalon Service & Repair Manual

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