Lexus RX (RX 350L, RX450h) 2016-2023 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

A37-1 (BATT) - D2-53 (E1)

G - BR

Battery (for measuring battery voltage and for ECM memory)

Always

11 to 14 V

A37-2 (+B) - D2-53 (E1)

R - BR

Power source of ECM

Engine switch on (IG)

11 to 14 V

A37-3 (+B2) - D2-53 (E1)

L - BR

Power source of ECM

Engine switch on (IG)

11 to 14 V

A37-4 (IGSW) - D2-53 (E1)

G - BR

Engine switch

Engine switch on (IG)

11 to 14 V

A37-7 (IREL) - D2-53 (E1)

Y - BR

INJ relay operation signal

Engine stopped, engine switch on (IG)

0 to 1.5 V

A37-8 (+BM) - D2-53 (E1)

L - BR

Power source of throttle actuator

Always

11 to 14 V

A37-13 (CANH) - D2-53 (E1)

Y - BR

CAN communication line

Engine stopped, engine switch on (IG)

Pulse generation

(See waveform 1)

A37-14 (EC) - Body ground

W-B - -

Ground

Always

Below 1 Ω

A37-17 (S) - D2-53 (E1)

B - BR

M shift position switch signal

Engine switch on (IG) and shift lever in M

11 to 14 V

Engine switch on (IG) and shift lever not in M

Below 1 V

A37-18 (FPC) - D2-53 (E1)

L - BR

Fuel pump control

Engine stopped, engine switch on (IG)

Below 1.5 V

A37-19 (VPMP) - D2-53 (E1)

G - BR

Vent valve (built into canister pump module)

Engine switch on (IG)

11 to 14 V

A37-21 (MPMP) - D2-53 (E1)

V - BR

Leak detection pump (built into canister pump module)

Leak detection pump OFF

Below 3 V

Leak detection pump ON

11 to 14 V

A37-26 (CANL) - D2-53 (E1)

P - BR

CAN communication line

Engine stopped, engine switch on (IG)

Pulse generation

(See waveform 2)

A37-27 (STP) - D2-53 (E1)

Y - BR

Stop light switch assembly signal

Brake pedal depressed

7.5 to 14 V

Brake pedal released

Below 1.5 V

A37-28 (ELS3)*1 - D2-53 (E1)

B - BR

Voltage inverter assembly signal

Engine stopped, engine switch on (IG)

7.5 to 14 V

A37-30 (NEO) - D2-53 (E1)

B - BR

Engine speed signal sent to other ECUs

Idling with warm engine

Pulse generation

(See waveform 3)

A37-35 (VCPP) - A37-34 (EPPM)

G - BR

Power source for canister pressure sensor (specific voltage)

Engine switch on (IG)

4.5 to 5.5 V

A37-36 (PPMP) - A37-34 (EPPM)

BE - BR

Canister pressure sensor (built into canister pump module)

Engine switch on (IG)

3.0 to 3.6 V

A37-39 (SPD) - D2-53 (E1)

GR - BR

Vehicle speed signal from combination meter assembly

Driving at 20 km/h (12 mph)

Pulse generation

(See waveform 4)

A37-42 (ST1-) - D2-53 (E1)

BR - BR

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

A37-43 (STA) - D2-53 (E1)

B - BR

Starter assembly signal

Cranking

6.0 V or higher

A37-46 (MREL) - D2-53 (E1)

Y - BR

EFI-MAIN relay operation signal

Engine switch on (IG)

11 to 14 V

A37-47 (VPA) - A37-48 (EPA)

BE - R

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

A37-49 (VCPA) - A37-48 (EPA)

G - R

Power source of accelerator pedal position sensor (for VPA)

Engine stopped, engine switch on (IG)

4.5 to 5.5 V

A37-50 (VPA2) - A37-51 (EPA2)

GR - V

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

A37-52 (VCP2) - A37-51 (EPA2)

W - V

Power source of accelerator pedal position sensor (for VPA2)

Engine stopped, engine switch on (IG)

4.5 to 5.5 V

A37-58 (KSW) - D2-53 (E1)

W - BR

Key in vehicle signal

Engine switch off → on (IG)

0 to 3.0 V

D2-2 (OE2+) - D2-3 (OE2-)

BR - L

Cam timing oil control solenoid assembly (for exhaust camshaft of bank 2) operation signal

Idling

Pulse generation

(See waveform 5)

D2-4 (OE1+) - D2-5 (OE1-)

G - B

Cam timing oil control solenoid assembly (for exhaust camshaft of bank 1) operation signal

Idling

Pulse generation

(See waveform 5)

D2-9 (OC2+) - D2-8 (OC2-)

B - L

Cam timing oil control solenoid assembly (for intake camshaft of bank 2) operation signal

Idling

Pulse generation

(See waveform 6)

D2-16 (HT2B) - D2-53 (E1)

G - BR

Heated oxygen sensor (bank 2 sensor 2) heater operation signal

Idling

Below 3.0 V

Engine switch on (IG)

11 to 14 V

D2-17 (HA2A) - D2-46 (E05)

BR - W-B

Air fuel ratio sensor (bank 2 sensor 1) heater operation signal

Idling

Pulse generation

(See waveform 7)

Engine switch on (IG)

11 to 14 V

D2-18 (+BD2) - D2-53 (E1)

B - BR

Power source of ECM (injector driver)

Engine stopped, engine switch on (IG)

11 to 14 V

D2-19 (+BD1) - D2-53 (E1)

W - BR

Power source of ECM (injector driver)

Engine stopped, engine switch on (IG)

11 to 14 V

D2-20 (E02) - Body ground

W-B - -

Ground

Always

Below 1 Ω

D2-21 (E04) - Body ground

W-B - -

Ground

Always

Below 1 Ω

D2-23 (FP1+) - D2-22 (FP1-)

W - B

Fuel pump assembly (for high pressure side) signal

Idling with warm engine

Pulse generation

D2-24 (#6D+) - D2-54 (#6D-)

L - G

No. 6 fuel injector assembly (for direct injection) signal

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

Pulse generation

D2-25 (#3D+) - D2-26 (#3D-)

L - G

No. 3 fuel injector assembly (for direct injection) signal

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

Pulse generation

D2-27 (#5D+) - D2-57 (#5D-)

L - G

No. 5 fuel injector assembly (for direct injection) signal

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

Pulse generation

D2-28 (#2D+) - D2-58 (#2D-)

L - G

No. 2 fuel injector assembly (for direct injection) signal

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

Pulse generation

D2-29 (#4D+) - D2-59 (#4D-)

L - G

No. 4 fuel injector assembly (for direct injection) signal

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

Pulse generation

D2-30 (#1D+) - D2-60 (#1D-)

L - G

No. 1 fuel injector assembly (for direct injection) signal

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

Pulse generation

D2-34 (IGT6) - D2-53 (E1)

B - BR

No. 6 ignition coil assembly signal (ignition signal)

Idling with warm engine

Pulse generation

(See waveform 8)

D2-35 (IGT4) - D2-53 (E1)

L - BR

No. 4 ignition coil assembly signal (ignition signal)

Idling with warm engine

Pulse generation

(See waveform 8)

D2-36 (IGT2) - D2-53 (E1)

BR - BR

No. 2 ignition coil assembly signal (ignition signal)

Idling with warm engine

Pulse generation

(See waveform 8)

D2-38 (OC1+) - D2-68 (OC1-)

B - BR

Cam timing oil control solenoid assembly (for intake camshaft of bank 1) operation signal

Idling

Pulse generation

(See waveform 6)

D2-39 (ACM) - D2-53 (E1)

B - BR

No. 2 vacuum switching valve assembly (for active control engine mount) operation signal

Engine switch on (IG)

11 to 14 V

D2-40 (#60) - D2-51 (E01)

BR - W-B

No. 6 fuel injector assembly (for port injection) signal

Engine switch on (IG)

0 to 5 V

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

Pulse generation

(See waveform 9)

D2-41 (#30) - D2-51 (E01)

B - W-B

No. 3 fuel injector assembly (for port injection) signal

Engine switch on (IG)

0 to 5 V

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

Pulse generation

(See waveform 9)

D2-42 (#50) - D2-51 (E01)

B-W - W-B

No. 5 fuel injector assembly (for port injection) signal

Engine switch on (IG)

0 to 5 V

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

Pulse generation

(See waveform 9)

D2-43 (#20) - D2-51 (E01)

G - W-B

No. 2 fuel injector assembly (for port injection) signal

Engine switch on (IG)

0 to 5 V

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

Pulse generation

(See waveform 9)

D2-44 (#40) - D2-51 (E01)

W - W-B

No. 4 fuel injector assembly (for port injection) signal

Engine switch on (IG)

0 to 5 V

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

Pulse generation

(See waveform 9)

D2-45 (#10) - D2-51 (E01)

L - W-B

No. 1 fuel injector assembly (for port injection) signal

Engine switch on (IG)

0 to 5 V

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

Pulse generation

(See waveform 9)

D2-46 (E05) - Body ground

W-B - -

Ground

Always

Below 1 Ω

D2-47 (M-) - D2-49 (ME01)

B - W-B

Throttle actuator operation signal (negative signal)

Idling with warm engine

Pulse generation

(See waveform 10)

D2-48 (M+) - D2-49 (ME01)

W - W-B

Throttle actuator operation signal (positive terminal)

Idling with warm engine

Pulse generation

(See waveform 11)

D2-49 (ME01) - Body ground

W-B - -

Ground

Always

Below 1 Ω

D2-50 (HT1B) - D2-53 (E1)

BR - BR

Heated oxygen sensor (bank 1 sensor 2) heater operation signal

Idling

Below 3.0 V

Engine switch on (IG)

11 to 14 V

D2-51 (E01) - Body ground

W-B - -

Ground

Always

Below 1 Ω

D2-52 (HA1A) - D2-21 (E04)

G - W-B

Air fuel ratio sensor (bank 1 sensor 1) heater operation signal

Idling

Pulse generation

(See waveform 7)

Engine switch on (IG)

11 to 14 V

D2-53 (E1) - Body ground

BR - -

Ground

Always

Below 1 Ω

D2-55 (E1D2) - Body ground

W-B - -

Ground

Always

Below 1 Ω

D2-56 (E1D1) - Body ground

W-B - -

Ground

Always

Below 1 Ω

D2-64 (PTCR) - D2-53 (E1)

L - BR

Thermostat heater operation signal

Engine switch on (IG)

11 to 14 V

D2-65 (PRG) - D2-53 (E1)

V - BR

Purge VSV operation signal

Engine switch on (IG)

11 to 14 V

Idling

Pulse generation

(See waveform 12)

D2-66 (ACIS) - D2-53 (E1)

Y - BR

No. 1 vacuum switching valve (for intake air control valve sub-assembly) operation signal

Engine switch on (IG)

11 to 14 V

D2-69 (IGT5) - D2-53 (E1)

Y - BR

No. 5 ignition coil assembly signal (ignition signal)

Idling with warm engine

Pulse generation

(See waveform 8)

D2-70 (IGT3) - D2-53 (E1)

BR - BR

No. 3 ignition coil assembly signal (ignition signal)

Idling with warm engine

Pulse generation

(See waveform 8)

D2-71 (IGT1) - D2-53 (E1)

L - BR

No. 1 ignition coil assembly signal (ignition signal)

Idling with warm engine

Pulse generation

(See waveform 8)

D2-82 (KNK1) - D2-81 (EKNK)

B - W

Knock control sensor (bank 1) signal

Engine speed maintained at 4000 rpm after warming up engine

Pulse generation

(See waveform 13)

D2-87 (PR) - D2-133 (ETHW)

GR - BR

Fuel pressure sensor (for high pressure side) signal

Idling with warm engine

0.5 to 4.5 V

D2-89 (VTA2) - D2-120 (ETA)

G - B

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

D2-90 (VC) - D2-53 (E1)

V - BR

Power source for sensor (specific voltage)

Engine switch on (IG)

4.5 to 5.5 V

D2-91 (OX2B) - D2-92 (EX2B)

B - L

Heated oxygen sensor (bank 2 sensor 2) signal

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

Pulse generation

(See waveform 14)

D2-93 (OX1B) - D2-94 (EX1B)

L - V

Heated oxygen sensor (bank 1 sensor 2) signal

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

Pulse generation

(See waveform 14)

D2-96 (VCNE) - D2-53 (E1)

L - BR

Power source of crankshaft position sensor (specific voltage)

Engine switch on (IG)

4.5 to 5.5 V

D2-98 (VCV2) - D2-97 (VV2-)

BR - B

Power source of VVT sensor (bank 2) (specific voltage)

Engine switch on (IG)

4.5 to 5.5 V

D2-99 (VCV1) - D2-100 (VV1-)

L - BR

Power source of VVT sensor (bank 1) (specific voltage)

Engine switch on (IG)

4.5 to 5.5 V

D2-101 (THW) - D2-133 (ETHW)

B - BR

Engine coolant temperature sensor

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

0.2 to 1.0 V

D2-102 (THA) - D2-115 (E2G)

L - GR

Intake air temperature sensor

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

0.5 to 3.4 V

D2-106 (NSW) - D2-53 (E1)

V - BR

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 1 V

D2-107 (R) - D2-53 (E1)

GR - BR

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

D2-108 (P) - D2-53 (E1)

V - BR

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

D2-114 (KNK2) - D2-113 (EKN2)

W - B

Knock control sensor (bank 2) signal

Engine speed maintained at 4000 rpm after warming up engine

Pulse generation

(See waveform 13)

D2-116 (VG) - D2-115 (E2G)

BR - GR

Mass air flow meter sub-assembly signal

Engine switch on (IG)

Pulse generation

(See waveform 15)

D2-121 (VCTA) - D2-120 (ETA)

Y - B

Power source of throttle position sensor (specific voltage)

Engine stopped, engine switch on (IG)

4.5 to 5.5 V

D2-122 (VTA1) - D2-120 (ETA)

BR - B

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

D2-123 (A2A+) - D2-53 (E1)

G - BR

Air fuel ratio sensor (bank 2 sensor 1) signal

Engine switch on (IG)

3.3 V*2

D2-124 (A2A-) - D2-53 (E1)

L - BR

Air fuel ratio sensor (bank 2 sensor 1) signal

Engine switch on (IG)

2.9 V*2

D2-125 (A1A+) - D2-53 (E1)

W - BR

Air fuel ratio sensor (bank 1 sensor 1) signal

Engine switch on (IG)

3.3 V*2

D2-126 (A1A-) - D2-53 (E1)

B - BR

Air fuel ratio sensor (bank 1 sensor 1) signal

Engine switch on (IG)

2.9 V*2

D2-127 (GE01) - Body ground

BR - -

Shielded earth (ground) circuit of throttle actuator

Always

Below 1 Ω

D2-128 (NE+) - D2-95 (NE-)

L - G

Crankshaft position sensor

Idling with warm engine

Pulse generation

(See waveform 16)

D2-129 (VV2+) - D2-97 (VV2-)

GR - B

VVT sensor (for intake camshaft of bank 2) signal

Idling

Pulse generation

(See waveform 17)

D2-130 (EV2+) - D2-97 (VV2-)

V - B

VVT sensor (for exhaust camshaft of bank 2) signal

Idling

Pulse generation

(See waveform 18)

D2-131 (EV1+) - D2-100 (VV1-)

B - BR

VVT sensor (for exhaust camshaft of bank 1) signal

Idling

Pulse generation

(See waveform 18)

D2-132 (VV1+) - D2-100 (VV1-)

G - BR

VVT sensor (for intake camshaft of bank 1) signal

Idling

Pulse generation

(See waveform 17)

D2-134 (PFL) - D2-133 (ETHW)

GR - BR

Fuel pressure sensor (for low pressure side) signal

Idling with warm engine

0.75 to 4.5 V

D2-136 (RFC) - D2-53 (E1)

BR - BR

Cooling fan control signal

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

Pulse generation

(See waveform 19)

D2-139 (D) - D2-53 (E1)

B - BR

D shift position switch signal

Engine switch on (IG) and shift lever in D or M

11 to 14 V

Engine switch on (IG) and shift lever not in D or M

Below 1 V

D2-140 (N) - D2-53 (E1)

BR - BR

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

*1: w/ Voltage inverter assembly

*2: The ECM terminal voltage is constant regardless of the voltage output from the sensor.

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

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 3

Engine Speed Signal

ECM Terminal Name

Between NEO and E1

Tester Range

1 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

Cam Timing Oil Control Solenoid Assembly (for Exhaust Camshaft) Signal

ECM Terminal Name

Between OE1+ and OE1-

Between OE2+ and OE2-

Tester Range

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

Condition

Idling

WAVEFORM 6

Cam Timing Oil Control Solenoid Assembly (for Intake Camshaft) Signal

ECM Terminal Name

Between OC1+ and OC1-

Between OC2+ and OC2-

Tester Range

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

Condition

Idling

WAVEFORM 7

Air Fuel Ratio Sensor Heater Operation Signal

ECM Terminal Name

Between HA1A and E04

Between HA2A and E05

Tester Range

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

Condition

Idling

WAVEFORM 8

Ignition Coil Assembly Signal (IGT Signal)

ECM Terminal Name

Between IGT (1 to 6) and E1

Tester Range

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

Condition

Idling with warm engine

WAVEFORM 9

No. 1 (to No. 6) Fuel Injector Assembly (for Port Injection) Signal

ECM Terminal Name

Between #10 (to #60) and E01

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 Way of the Data List.

WAVEFORM 10

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 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

Purge VSV Operation Signal

ECM Terminal Name

Between PRG and E1

Tester Range

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

Condition

Idling

HINT:

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

WAVEFORM 13

Knock Control Sensor Signal

ECM Terminal Name

Between KNK1 and EKNK

Between KNK2 and EKN2

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 will differ slightly depending on the vehicle.

WAVEFORM 14

Heated Oxygen Sensor Signal

ECM Terminal Name

Between OX1B and EX1B

Between OX2B and EX2B

Tester Range

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

Condition

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

HINT:

Data List, item "O2 Sensor Voltage B1S2" and "O2 Sensor Voltage B2S2" shows the ECM values from the heated oxygen sensor.

WAVEFORM 15

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 16

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 17

VVT Sensor (for Intake Camshaft) Signal

ECM Terminal Name

CH1: Between VV1+ and VV1-

CH2: Between VV2+ and VV2-

Tester Range

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

Condition

Idling

HINT:

The wavelength becomes shorter as the engine speed increases.

WAVEFORM 18

VVT Sensor (for Exhaust Camshaft) Signal

ECM Terminal Name

CH1: Between EV1+ and VV1-

CH2: Between EV2+ and VV2-

Tester Range

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

Condition

Idling

HINT:

The wavelength becomes shorter as the engine speed increases.

WAVEFORM 19

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.

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