Toyota Tundra Service Manual: Terminals Of Ecm

TERMINALS OF ECM

1. CHECK ECM

(a) Measure the voltage according to the value(s) in the table below.

HINT:

The standard voltage between each pair of ECM terminals is shown in the table below. The appropriate conditions for checking each pair of terminals are also indicated. The result of checks should be compared with the standard voltage for that pair of terminals, 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) - D74-81 (E1)

L - BR

Battery (for measuring battery voltage and for ECM memory)

Always

11 to 14 V

D74-41 (+BM) - D74-81 (E1)

P - BR

Power source of throttle actuator

Always

11 to 14 V

A24-28 (IGSW) - D74-81 (E1)

LG - BR

Ignition switch

Ignition switch ON

11 to 14 V

A24-3 (+B) - D74-81 (E1)

GR - BR

Power source of ECM

Ignition switch ON

11 to 14 V

A24-2 (+B2) - D74-81 (E1)

GR - BR

Power source of ECM

Ignition switch ON

11 to 14 V

D74-58 (OC1+) - D74-57 (OC1-)

B - B-L

Camshaft oil control valve (OCV) (for Intake Side of Bank 1)

Idling

Pulse generation

(see waveform 1)

D74-52 (OC2+) - D74-51 (OC2-)

L-B - R-B

Camshaft oil control valve (OCV) (for Intake Side of Bank 2)

Idling

Pulse generation

(see waveform 1)

D74-56 (OE1+) - D74-55 (OE1-)

L-W - L-B

Camshaft oil control valve (OCV) (for Exhaust Side of Bank 1)

Idling

Pulse generation

(see waveform 1)

D74-50 (OE2+) - D74-49 (OE2-)

L-R - L

Camshaft oil control valve (OCV) (for Exhaust Side of Bank 2)

Idling

Pulse generation

(see waveform 1)

A24-34 (MREL) - D74-81 (E1)

W - BR

EFI relay

Ignition switch ON

11 to 14 V

D74-74 (VG) - D74-75 (E2G)

L-Y - G-W

Mass air flow meter

Idling, shift lever in P or N, A/C switch OFF

0.5 to 3.0 V

D74-73 (THA) - D74-98 (E2)

Y-B - BR

Intake air temperature sensor

Idling, intake air temperature 20°C (68°F)

0.5 to 3.4 V

D74-76 (THW) - D74-98 (E2)

G-B - BR

Engine coolant temperature sensor

Idling, engine coolant temperature 80°C (176°F)

0.2 to 1.0 V

D74-80 (VCTA) - D74-79 (ETA)

Y - L

Power source of throttle position sensor (specific voltage)

Ignition switch ON

4.5 to 5.5 V

D74-78 (VTA1) - D74-79 (ETA)

R-Y - L

Throttle position sensor (for engine control)

Ignition switch ON,

throttle valve fully closed

0.5 to 1.1 V

Ignition switch ON,

throttle valve fully open

3.2 to 4.8 V

D74-77 (VTA2) - D74-79 (ETA)

Y-B - L

Throttle position sensor (for sensor malfunction detection)

Ignition switch ON,

throttle valve fully closed

2.1 to 3.1 V

Ignition switch ON,

throttle valve fully open

4.6 to 5.0 V

A24-55 (VPA) - A24-58 (EPA)

W - BE

Accelerator pedal position sensor (for engine control)

Ignition switch ON,

accelerator pedal released

0.5 to 1.1 V

Ignition switch ON,

accelerator pedal fully depressed

2.6 to 4.5 V

A24-56 (VPA2) - A24-60 (EPA2)

LG - P

Accelerator pedal position sensor (for sensor malfunction detection)

Ignition switch ON,

accelerator pedal released

1.2 to 2.0 V

Ignition switch ON,

accelerator pedal fully depressed

4.7 to 4.75 V

A24-57 (VCPA) - A24-58 (EPA)

B - BE

Power source of accelerator pedal position sensor (for VPA)

Ignition switch ON

4.5 to 5.5 V

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

V - P

Power source of accelerator pedal position sensor (for VPA2)

Ignition switch ON

4.5 to 5.5 V

D74-22 (HA1A) - D74-23 (E04)

L - W-B

A/F sensor heater

Idling with warm engine

Pulse generation

(see waveform 2)

D74-22 (HA1A) - D74-23 (E04)

L - W-B

A/F sensor heater

Ignition switch ON

11 to 14 V

D74-20 (HA2A) - D74-21 (E05)

G - W-B

A/F sensor heater

Idling with warm engine

Pulse generation

(see waveform 2)

D74-20 (HA2A) - D74-21 (E05)

G - W-B

A/F sensor heater

Ignition switch ON

11 to 14 V

D74-126 (A1A+) - D74-81 (E1)

G -BR

A/F sensor

Ignition switch ON

3.3 V*1

D74-125 (A1A-) - D74-81 (E1)

R - BR

A/F sensor

Ignition switch ON

2.9 V*1

D74-103 (A2A+) - D74-81 (E1)

P - BR

A/F sensor

Ignition switch ON

3.3 V*1

D74-102 (A2A-) - D74-81 (E1)

L - BR

A/F sensor

Ignition switch ON

2.9 V*1

D74-45 (HT1B) - D74-46 (E03)

G-B - W-B

Heated oxygen sensor heater

Idling

Below 3.0 V

D74-45 (HT1B) - D74-46 (E03)

G-B - W-B

Heated oxygen sensor heater

Ignition switch ON

11 to 14 V

D74-44 (HT2B) - D74-46 (E03)

B - W-B

Heated oxygen sensor heater

Idling

Below 3.0 V

D74-44 (HT2B) - D74-46 (E03)

B - W-B

Heated oxygen sensor heater

Ignition switch ON

11 to 14 V

D74-114 (OX1B) - D74-115 (EX1B)

G - L

Heated oxygen sensor

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

Pulse generation

(see waveform 3)

D74-112 (OX2B) - D74-113 (EX2B)

R - W

D74-86 (#10) - D74-43 (E01)

R-L - W-B

Fuel injector assembly

Ignition switch ON

11 to 14 V

D74-109 (#20) - D74-43 (E01)

L - W-B

Idling

Pulse generation

(see waveform 4)

D74-85 (#30) - D74-43 (E01)

R - W-B

D74-108 (#40) - D74-43 (E01)

Y - W-B

D74-84 (#50) - D74-43 (E01)

G - W-B

D74-107 (#60) - D74-43 (E01)

R - W-B

D74-83 (#70) - D74-43 (E01)

W - W-B

D74-106 (#80) - D74-43 (E01)

R-B - W-B

D74-94 (KNK1) - D74-93 (EKNK)

R - G

Knock sensor

Engine speed maintained at 4000 rpm after warming up engine

Pulse generation

(see waveform 5)

D74-117 (KNK2) - D74-116 (EKN2)

W - B

D74-96 (KNK3) - D74-95 (EKN3)

W - B

D74-119 (KNK4) - D74-118 (EKN4)

R - G

D74-92 (VV1+) - D74-91 (VV1-)

R - G

Variable valve timing (VVT) sensor (for Intake Side of Bank 1)

Idling

Pulse generation

(see waveform 6)

D74-87 (VV2+) - D74-88 (VV2-)

R - Y

Variable valve timing (VVT) sensor (for Intake Side for Bank 2)

Idling

Pulse generation

(see waveform 6)

D74-69 (EV1+) - D74-68 (EV1-)

R-L - B

Variable valve timing (VVT) sensor (for Exhaust Side of Bank 1)

Idling

Pulse generation

(see waveform 17)

D74-64 (EV2+) - D74-65 (EV2-)

R-L - B

Variable valve timing (VVT) sensor (for Exhaust Side of Bank 2)

Idling

Pulse generation

(see waveform 17)

D74-110 (NE+) - D74-111 (NE-)

W - Y

Crankshaft position sensor

Idling

Pulse generation

(see waveform 6)

D74-40 (IGT1) - D74-81 (E1)

B-Y - BR

Ignition coil (ignition signal)

Idling

Pulse generation

(see waveform 7)

D74-33 (IGT2) - D74-81 (E1)

L-Y - BR

D74-37 (IGT3) - D74-81 (E1)

B - BR

D74-34 (IGT4) - D74-81 (E1)

L-B - BR

D74-35 (IGT5) - D74-81 (E1)

G-R - BR

D74-36 (IGT6) - D74-81 (E1)

G - BR

D74-38 (IGT7) - D74-81 (E1)

G-W - BR

D74-39 (IGT8) - D74-81 (E1)

G-B - BR

D74-104 (IGF1) - D74-81 (E1)

G-B - BR

Ignition coil (ignition confirmation signal)

Ignition switch ON

4.5 to 5.5 V

Idling

Pulse generation

(see waveform 7)

D74-105 (IGF2) - D74-81 (E1)

R - BR

Ignition coil (ignition confirmation signal)

Ignition switch ON

4.5 to 5.5 V

Idling

Pulse generation

(see waveform 7)

D74-63 (PRG) - D74-81 (E1)

L-B - BR

Purge VSV

Ignition switch ON

11 to 14 V

Idling

Pulse generation

(see waveform 8)

A24-13 (SPD) - D74-81 (E1)

BE - BR

Speed signal from combination meter

Driving at 20 km/h (12 mph)

Pulse generation

(see waveform 9)

A24-46 (STA) - D74-81 (E1)

R - BR

Starter signal

Cranking

5.5 V or more

D74-120 (NSW) - D74-81 (E1)

L - BR

Park/neutral position switch

Ignition switch ON, shift lever position not in P or N

11 to 14 V

Ignition switch ON, shift lever in P or N

Below 3.0 V

A24-36 (STP) - D74-81 (E1)

SB - BR

Stop light switch

Brake pedal depressed

7.5 to 14 V

Brake pedal released

Below 1.5 V

A24-35 (ST1-) - D74-81 (E1)

G - BR

Stop light switch

(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

D74-19 (M+) - D74-82 (ME01)

R - W-B

Throttle actuator

Idling with warm engine

Pulse generation

(see waveform 10)

D74-18 (M-) - D74-82 (ME01)

G - W-B

Throttle actuator

Idling with warm engine

Pulse generation

(see waveform 11)

A24-52 (FPC) - D74-81 (E1)

B - BR

Fuel pump control

Ignition switch ON

Below 1.5 V

A24-16 (TC) - D74-81 (E1)

Y - BR

Terminal TC of DLC3

Ignition switch ON

11 to 14 V

A24-15 (TACH) - D74-81 (E1)

P - BR

Engine speed

Idling

Pulse generation

(see waveform 12)

A24-30 (VPMP) - D74-81 (E1)

V - BR

Vent valve (built into canister pump module)

Ignition switch ON

11 to 14 V

A24-49 (MPMP) - D74-81 (E1)

LG - BR

Leak detection pump (built into canister pump module)

Leak detection pump OFF

Below 3.0 V

Leak detection pump ON

11 to 14 V

D74-67 (VCV1) - D74-98 (E2)

L - BR

Power source for sensor (specific voltage)

Ignition switch ON

4.5 to 5.5 V

D74-66 (VCV2) - D74-98 (E2)

L - BR

Power source for sensor (specific voltage)

Ignition switch ON

4.5 to 5.5 V

D74-121 (PPMP) - D74-98 (E2)

P - BR

Canister pressure sensor (built into canister pump module)

Ignition switch ON

3.3 to 4.0 V

D74-32 (ALT) - D74-81 (E1)

R - BR

Generator

Ignition switch ON

11 to 14 V

A24-10 (CANH) - D74-81 (E1)

GR - BR

CAN communication line

Ignition switch ON

Pulse generation

(see waveform 13)

A24-11 (CANL) - D74-81 (E1)

W - BR

CAN communication line

Ignition switch ON

Pulse generation

(see waveform 14)

D74-62 (ACIS) - D74-81 (E1)

L-Y - BR

VSV for ACIS (Acoustic Control Induction System) operation signal

Ignition switch ON

11 to 14 V

D74-60 (HAI1) - D74-81 (E1)

B - BR

Air pump heater for secondary air injection system

AI heater operating

Below 1.5 V

D74-28 (AIRV) - D74-81 (E1)

BR - BR

Air switching valve for secondary air injection system

Ignition switch ON

11 to 14 V

D74-54 (AIRP) - D74-81 (E1)

P - BR

Air pump control

Ignition switch ON

11 to 14 V

D74-30 (AIDI) - D74-81 (E1)

G - BR

Diagnostic information signal for secondary air injection system

Secondary air injection system operating

Pulse generation

(see waveform 16)

A24-54 (AIP) - D74-98 (E2)

Y - BR

Secondary air injection system pressure signal

Ignition switch ON

3.0 to 3.6 V

A24-43 (ARV2) - D74-81 (E1)

V - BR

Air switching valve for secondary air injection system

Ignition switch ON

11 to 14 V

D74-53 (ARP2) - D74-81 (E1)

P-L - BR

Air pump control

Ignition switch ON

11 to 14 V

D74-29 (AID2) - D74-81 (E1)

G-Y - BR

Diagnostic information signal for secondary air injection system

Air injection system operating

Pulse generation

(see waveform 16)

A24-53 (AIP2) - D74-98 (E2)

G - BR

Secondary air injection system pressure signal

Ignition switch ON

3.0 to 3.6 V

D74-90 (G2) - D74- 89 (G2-)

R - B

Camshaft position sensor

Idling

Pulse generation

(see waveform 15)

A24-14 (STSW) - D74-81 (E1)

BR - BR

Starter switch

Shift lever in P or N, cranking

6.0 V or more

A24-41 (ACCR) - D74-81 (E1)

BR - BR

ACC relay control signal

Ignition switch ON → Cranking

11 to 14 V → Below 1 V

D74-16 (STAR) - D74-81 (E1)

L - BR

Starter relay control

Ignition switch ON

Below 1.5 V

Cranking

5.5 V or more

D74-72 (PSP) - D74-81 (E1)

G - BR

Power steering oil pressure sensor

Ignition switch ON

0.5 to 4.5 V

D74-97 (PIM) - D74-98 (E2)

L-R - BR

Manifold absolute pressure sensor

Idling

1.2 to 2.0 V

D74-48 (EGR1) - D74-81 (E1)

B - BR

EGR valve assembly

Engine racing with warm engine

Pulse generation

(see waveform 18)

D74-1 (EGR2) - D74-81 (E1)

B-L - BR

EGR valve assembly

Engine racing with warm engine

Pulse generation

(see waveform 19)

D74-24 (EGR3) - D74-81 (E1)

B-R - BR

EGR valve assembly

Engine racing with warm engine

Pulse generation

(see waveform 18)

D74-47 (EGR4) - D74-81 (E1)

B-Y - BR

EGR valve assembly

Engine racing with warm engine

Pulse generation

(see waveform 19)

A24-33 (ELS2) - D74-81 (E1)

B - BR

Electric load

Defogger switch on

7.5 to 14 V

Defogger switch off

Below 1.5 V

A24-4 (ADJ1)*2 - Body ground

W-B - Body ground

Vehicle type designation wire harness

Always

Below 1 V

HINT:

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

*2: Only for 2WD

(b) WAVEFORM 1:

Camshaft Oil Control Valve (OCV)

Terminal No. (Symbol)

Tool Setting

Condition

D74-58 (OC1+) - D74-57 (OC1-)

5 V/DIV., 1 msec./DIV.

Idling

D74-52 (OC2+) - D74-51 (OC2-)

5 V/DIV., 1 msec./DIV.

Idling

D74-56 (OE1+) - D74-55 (OE1-)

5 V/DIV., 1 msec./DIV.

Idling

D74-50 (OE2+) - D74-49 (OE2-)

5 V/DIV., 1 msec./DIV.

Idling

(c) WAVEFORM 2:

Air Fuel Ratio Sensor Heater

Terminal No. (Symbol)

Tool Setting

Condition

CH1: D74-22 (HA1A) - D74-23 (E04)

5 V/DIV., 10 msec./DIV.

Idling with warm engine

CH2: D74-20 (HA2A) - D74-21 (E05)

5 V/DIV., 10 msec./DIV.

Idling with warm engine

HINT:

The wavelength varies in accordance with the engine operating conditions.

(d) WAVEFORM 3:

Heated Oxygen Sensor

Terminal No. (Symbol)

Tool Setting

Condition

D74-114 (OX1B) - D74-115 (EX1B)

0.2 V/DIV., 200 msec./DIV.

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

D74-112 (OX2B) - D74-113 (EX2B)

0.2 V/DIV., 200 msec./DIV.

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

HINT:

In the Data List, item O2S B1S2 and O2S B2S2 show the ECM input values from the heated oxygen sensor.

(e) WAVEFORM 4:

Fuel Injector No. 1 (to No. 8) Injection Signal

Terminal No. (Symbol)

Tool Setting

Condition

D74-86 (#10) - D74-43 (E01)

20 V/DIV., 20 msec./DIV.

Idling

D74-109 (#20) - D74-43 (E01)

20 V/DIV., 20 msec./DIV.

Idling

D74-85 (#30) - D74-43 (E01)

20 V/DIV., 20 msec./DIV.

Idling

D74-108 (#40) - D74-43 (E01)

20 V/DIV., 20 msec./DIV.

Idling

D74-84 (#50) - D74-43 (E01)

20 V/DIV., 20 msec./DIV.

Idling

D74-107 (#60) - D74-43 (E01)

20 V/DIV., 20 msec./DIV.

Idling

D74-83 (#70) - D74-43 (E01)

20 V/DIV., 20 msec./DIV.

Idling

D74-106 (#80) - D74-43 (E01)

20 V/DIV., 20 msec./DIV.

Idling

HINT:

The wavelength becomes shorter as the engine rpm increases.

(f) WAVEFORM 5:

Knock Sensor

Terminal No. (Symbol)

Tool Setting

Condition

D74-94 (KNK1) - D74-93 (EKNK)

1 V/DIV., 1 msec./DIV.

Engine speed maintained at 4000 rpm after warming up engine

D74-117 (KNK2) - D74-116 (EKN2)

1 V/DIV., 1 msec./DIV.

Engine speed maintained at 4000 rpm after warming up engine

D74-96 (KNK3) - D74-95 (EKN3)

1 V/DIV., 1 msec./DIV.

Engine speed maintained at 4000 rpm after warming up engine

D74-119 (KNK4) - D74-118 (EKN4)

1 V/DIV., 1 msec./DIV.

Engine speed maintained at 4000 rpm after warming up engine

HINT:

  • The wavelength becomes shorter as the engine rpm increases.
  • The waveforms and amplitudes displayed differ slightly depending on the vehicle.

(g) WAVEFORM 6:

Crankshaft Position Sensor and VVT Sensor for Intake Side

Terminal No. (Symbol)

Tool Setting

Condition

(a) D74-110 (NE+) - D74-111 (NE-)

5 V/DIV., 20 msec./DIV.

Idling after engine warmed up

(b) D74-92 (VV1+) - D74-91 (VV1-)

5 V/DIV., 20 msec./DIV.

Idling after engine warmed up

(c) D74-87 (VV2+) - D74-88 (VV2-)

5 V/DIV., 20 msec./DIV.

Idling after engine warmed up

HINT:

The wavelength becomes shorter as engine rpm increases.

(h) WAVEFORM 7:

Igniter IGT Signal (from ECM to Igniter) and Igniter IGF Signal (from Igniter to ECM)

Terminal No. (Symbol)

Tool Setting

Condition

(a) D74-40 (IGT1) - D74-81 (E1)

2 V/DIV., 20 msec./DIV.

Idling

(a) D74-33 (IGT2) - D74-81 (E1)

2 V/DIV., 20 msec./DIV.

Idling

(a) D74-37 (IGT3) - D74-81 (E1)

2 V/DIV., 20 msec./DIV.

Idling

(a) D74-34 (IGT4) - D74-81 (E1)

2 V/DIV., 20 msec./DIV.

Idling

(a) D74-35 (IGT5) - D74-81 (E1)

2 V/DIV., 20 msec./DIV.

Idling

(a) D74-36 (IGT6) - D74-81 (E1)

2 V/DIV., 20 msec./DIV.

Idling

(a) D74-38 (IGT7) - D74-81 (E1)

2 V/DIV., 20 msec./DIV.

Idling

(a) D74-39 (IGT8) - D74-81 (E1)

2 V/DIV., 20 msec./DIV.

Idling

(b) D74-104 (IGF1) - D74-81 (E1)

2 V/DIV., 20 msec./DIV.

Idling

(b) D74-105 (IGF2) - D74-81 (E1)

2 V/DIV., 20 msec./DIV.

Idling

HINT:

The wavelength becomes shorter as engine rpm increases.

(i) WAVEFORM 8:

Purge VSV

Terminal No. (Symbol)

Tool Setting

Condition

D74-63 (PRG) - D74-81 (E1)

10 V/DIV., 20 msec./DIV.

Idling

HINT:

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

(j) WAVEFORM 9:

Vehicle Speed Signal

Terminal No. (Symbol)

Tool Setting

Condition

A24-13 (SPD) - D74-81 (E1)

2 V/DIV., 20 msec./DIV.

Driving at 20 km/h (12 mph)

HINT:

The wavelength becomes shorter as the vehicle speed increases.

(k) WAVEFORM 10:

Throttle Actuator Positive Terminal

Terminal No. (Symbol)

Tool Setting

Condition

D74-19 (M+) - D74-82 (ME01)

5 V/DIV., 1 msec./DIV.

Idling with warm engine

HINT:

The duty ratio varies depending on the throttle actuator operation.

(l) WAVEFORM 11:

Throttle Actuator Negative Terminal

Terminal No. (Symbol)

Tool Setting

Condition

D74-18 (M-) - D74-82 (ME01)

5 V/DIV., 1 msec./DIV.

Idling with warm engine

HINT:

The duty ratio varies depending on the throttle actuator operation.

(m) WAVEFORM 12:

Engine Speed Signal

Terminal No. (Symbol)

Tool Setting

Condition

A24-15 (TACH) - D74-81 (E1)

5 V/DIV., 10 msec./DIV.

Idling

HINT:

The wavelength becomes shorter as the engine rpm increases.

(n) WAVEFORM 13:

CAN Communication Signal (Reference)

Terminal No. (Symbol)

Tool Setting

Condition

A24-10 (CANH) - D74-81 (E1)

1 V/DIV., 10 μsec./DIV.

Engine stopped and ignition switch ON

HINT:

The waveform varies depending on the CAN communication signal.

(o) WAVEFORM 14:

CAN Communication Signal (Reference)

Terminal No. (Symbol)

Tool Setting

Condition

A24-11 (CANL) - D74-81 (E1)

1 V/DIV., 10 μsec./DIV.

Engine stopped and ignition switch ON

HINT:

The waveform varies depending on the CAN communication signal.

(p) WAVEFORM 15:

Crankshaft Position Sensor and Camshaft Position Sensor

Terminal No. (Symbol)

Tool Setting

Condition

CH1: D74-110 (NE+) - D74-111 (NE-)

5 V/DIV., 20 msec./DIV.

Idling after engine warmed up

CH2: D74-90 (G2) - D74-89 (G2-)

5 V/DIV., 20 msec./DIV.

Idling after engine warmed up

HINT:

The wavelength becomes shorter as the engine rpm increases.

(q) WAVEFORM 16:

Terminal DI of Air Injection Control Driver

Terminal No. (Symbol)

Tool Setting

Condition

D74-30 (AIDI) - D74-81 (E1)

5 V/DIV., 50 msec./DIV.

Performing system check using Techstream (secondary air injection check)

D74-29 (AID2) - D74-81 (E1)

5 V/DIV., 50 msec./DIV.

Performing system check using Techstream (secondary air injection check)

HINT:

The wavelength changes when the air injection control driver detects malfunctions in the secondary air injection system (See page ).

(r) WAVEFORM 17:

Crankshaft Position Sensor and VVT Sensor for Exhaust Side

Terminal No. (Symbol)

Tool Setting

Condition

(a) D74-110 (NE+) - D74-111 (NE-)

5 V/DIV., 20 msec./DIV.

Idling after engine warmed up

(b) D74-69 (EV1+) - D74-68 (EV1-)

5 V/DIV., 20 msec./DIV.

Idling after engine warmed up

(c) D74-64 (EV2+) - D74-65 (EV2-)

5 V/DIV., 20 msec./DIV.

Idling after engine warmed up

HINT:

The wavelength becomes shorter as engine rpm increases.

(s) WAVEFORM 18:

EGR Valve Signal

Terminal No. (Symbol)

Tool Setting

Condition

CH1: D74-48 (EGR1) - D74-81 (E1)

10 V/DIV., 20 msec./DIV.

Engine racing with warm engine

CH2: D74-24 (EGR3) - D74-81 (E1)

10 V/DIV., 20 msec./DIV.

Engine racing with warm engine

(t) WAVEFORM 19:

EGR Valve Signal

Terminal No. (Symbol)

Tool Setting

Condition

CH1: D74-1 (EGR2) - D74-81 (E1)

10 V/DIV., 20 msec./DIV.

Engine racing with warm engine

CH2: D74-47 (EGR4) - D74-81 (E1)

10 V/DIV., 20 msec./DIV.

Engine racing with warm engine

    System Diagram

    VC Output Circuit

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