TROUBLE DIAGNOSIS GENERAL DESCRIPTION

(1)

SEC004C

inspection, remove instrument lower cover.

2. Remove ECM harness protector.

MEC486B

3. Perform all voltage measurements with the connector con- nected. Extend tester probe as shown to perform tests easily.

I Open harness securing clip to make testing easier.

I Use extreme care not to touch 2 pins at one time.

I Data is for comparison and may not be exact.

ECM HARNESS CONNECTOR TERMINAL LAYOUT

NHEC0044S02

SEF970W

ECM INSPECTION TABLE

NHEC0044S03

Specification data are reference values and are measured between each terminal and body ground.

CAUTION:

Do not use ECM ground terminals when measuring input/

output voltage. Doing so may result in damage to the ECM’s

transistor. Use a ground other than ECM terminals, such as

the ground.

(2)

1 PU/R

EVAP canister purge volume control solenoid valve

[Engine is running]

I Idle speed

BATTERY VOLTAGE (11 - 14V)

SEF994U

I Engine speed is about 2,000 rpm (More than 100 seconds after starting engine).

SEF995U

2 R/L

Heated oxygen sensor 1 heater (front) (bank 2)

I Engine speed is below 3,600 rpm. 0 - 1.0V [Engine is running]

I Engine speed is above 3,600 rpm.

3 OR/L

Heated oxygen sensor 1 heater (front) (bank 1)

I Engine speed is below 3,600 rpm. 0 - 1.0V [Engine is running]

4 R/L

Heated oxygen sensor 2 heater (rear) (bank 2)

I Engine speed is below 3,600 rpm.

I After driving for 2 minutes at a speed of 70 km/h (43 MPH) or more.

0 - 1.0V

[Ignition switch “ON”]

I Engine stopped [Engine is running]

5 P/B

Heated oxygen sensor 2 heater (rear) (bank 1)

I Engine speed is below 3,600 rpm.

I After driving for 2 minutes at a speed of 70 km/h (43 MPH) or more.

0 - 1.0V

I Engine stopped [Engine is running]

6 7 8 17

W/PU Y/B Y GY/L

IACV-AAC valve [Engine is running]

I Idle speed 0.1 - 14V

16 Y/G VIAS control solenoid valve

I Idle speed

I Engine speed is above 5,000 rpm. 0 - 1.0V

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(3)

21 22 23 30 31 32

Y/R G/R L/R GY PU/W GY/R

Ignition signal No. 1 Ignition signal No. 2 Ignition signal No. 3 Ignition signal No. 4 Ignition signal No. 5 Ignition signal No. 6

I Warm-up condition I Idle speed

0 - 0.2V★

SEF399T

I Warm-up condition I Engine speed is 2,500 rpm.

0.1 - 0.3V★

SEF645T

25 W/G Tachometer

10 - 11V★

SEF579X

10 - 11V★

SEF580X

26 W/B ECM relay

(Self shutt-off)

[Ignition switch “OFF”]

I For a few seconds after turning ignition switch

“OFF”

0 - 1.5V

[Ignition switch “OFF”]

I A few seconds passed after turning ignition switch “OFF”

27 B/R Air conditioner relay

I Both A/C switch and blower switch are “ON”

(Compressor is operating).

0 - 1.0V

I A/C switch is “OFF”.

28 B/P Fuel pump relay

I For 1 second after turning ignition switch “ON”

0 - 1.5V

I 1 second passed after turning ignition switch

“ON”.

(4)

29 G Swirl control valve control solenoid valve

I Idle speed

I Engine coolant temperature is between 15 to 50°C (59 to 122°F).

0 - 1.0V

I Idle speed

I Engine coolant temperature is above 50°C (122°F).

34 LG Cooling fan relay (High)

I Cooling fan is operating at high speed. 0 - 1.0V [Engine is running]

I Cooling fan is not operating.

35 BR/R Cooling fan relay (Low)

I Cooling fan is operating. 0 - 1.0V

I Cooling fan is not operating.

38 LG/B MIL

[Ignition switch “ON”] 0 - 1.0V

I Idle speed

39 OR/G Vacuum cut valve

bypass valve [Ignition switch “ON”] BATTERY VOLTAGE

(11 - 14V)

40 OR/L EVAP canister vent

control valve [Ignition switch “ON”] BATTERY VOLTAGE

(11 - 14V)

42 BR/W Start signal

[Ignition switch “ON”] Approximately 0V

[Ignition switch “START”] 9 - 12V

43 R Ignition switch

[Ignition switch “OFF”] 0V

[Ignition switch “ON”] BATTERY VOLTAGE

(11 - 14V)

44 G/OR PNP switch

I Gear position is “P” or “N”. Approximately 0V [Ignition switch “ON”]

I Except the above gear position

45 G/B Air conditioner switch signal

I Both A/C switch and blower switch are “ON”. Approximately 0V [Engine is running]

I A/C switch is “OFF”.

46 W/L Ambient air temperature switch signal

I Idle speed

I Ambient air temperature is above 25°C (77°F).

I Air conditioner is operating.

0V

I Idle speed

I Ambient air temperature is above 25°C (77°F).

I Air conditioner is not operating.

Approximately 5V

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(5)

47 G Power steering oil pressure switch

I Steering wheel is being turned. 0 - 1.0V [Engine is running]

I Steering wheel is not being turned.

48 B ECM ground [Engine is running]

I Idle speed Engine ground

49 W Electronic controlled engine mount-1

I Idle speed 0 - 1.0V

I Except the above

50 W/R Electronic controlled engine mount-2

I Idle speed

I Except the above 0 - 1.0V

51 PU A/C cut signal [Engine is running]

I Air conditioner is operating. 0 - 0.5V

52 W/G Electrical load signal

I Rear window defogger: ON I Hi-beam headlamp: ON

I Electrical load: OFF 0V

55 W/B

Swirl control valve control vacuum check switch

I Idle speed

I Engine coolant temperature is between 15 to 50°C (59 to 122°F).

Approximately 5V

I Idle speed

I Engine coolant temperature is above 50°C (122°F).

0 - 1.0V

56 GY/L Throttle position switch (Closed position)

I Accelerator pedal fully released

I Accelerator pedal depressed Approximately 0V

57 B ECM ground [Engine is running]

58 B Sensors’ ground

Approximately 0V

59 B Fuel level sensor ground

I Idle speed Approximately 0V

61 W Mass air flow sensor

1.2 - 1.8V

1.6 - 2.2V

(6)

62 W Heated oxygen sensor 1 (front) (bank 2)

0 - Approximately 1.0V (Peri- odically change)

SEF059V

63 W Heated oxygen sensor 1 (front) (bank 1)

0 - Approximately 1.0V (Peri- odically change)

SEF059V

64 Y/G Intake air temperature

sensor [Engine is running]

Approximately 0 - 4.8V Output voltage varies with intake air temperature.

65 75

W W

Crankshaft position sensor (REF)

Approximately 2.3V★

(AC voltage)

SEF581X

66 76

W W

Camshaft position sensor (PHASE)

Approximately 4.2V★

(AC voltage)

SEF582X

67 W/L Power supply for ECM

(Buck-up) [Ignition switch “OFF”] BATTERY VOLTAGE

(11 - 14V)

70 Y Engine coolant tem-

perature sensor [Engine is running]

Approximately 0 - 4.8V Output voltage varies with engine coolant temperature.

71 W Heated oxygen sensor 2 (rear) (bank 2)

0 - Approximately 1.0V

72 W Heated oxygen sensor 2 (rear) (bank 1)

0 - Approximately 1.0V

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(7)

73 B Mass air flow sensor ground

Approximately 0V

80 W Absolute pressure sen-

sor [Ignition switch “ON”] Approximately 4.4V

81 W Refrigerant pressure sensor

I Warm-up condition

I Both A/C switch and blower switch are “ON”.

(Compressor operates.)

1.0 - 4.0V

82 W Throttle position sensor signal output

Approximately 0.4V

I Accelerator pedal fully depressed Approximately 4V 83 G Fuel level sensor [Ignition switch “ON”]

Approximately 0 - 4.8V Output voltage varies with fuel level.

84 W EVAP control system

pressure sensor [Ignition switch “ON”] Approximately 3.4V

85 W Crankshaft position sensor (POS)

I Idle speed

Approximately 2.4V

SEF057V

I Engine speed is 2,000 rpm.

Approximately 2.3V

SEF058V

86 P/L Vehicle speed sensor

I Jack up front wheels.

I In 1st gear position I 10 km/h (6 MPH)

Approximately 2.5V

SEF583X

I Jack up front wheels.

I In 2nd gear position I 30 km/h (19 MPH)

Approximately 2.0V

(8)

91 L/W Throttle position sensor

0.15 - 0.85V

I Accelerator pedal fully depressed 3.5 - 4.7V 92 P/L Fuel tank temperature

sensor [Engine is running]

Approximately 0 - 4.8V Output voltage varies with fuel tank temperature.

93 W Knock sensor [Engine is running]

I Idle speed Approximately 2.5V

101 102 103 104 105 107

R/B L/W R/W PU/R R/Y R/L

Injector No. 1 Injector No. 5 Injector No. 2 Injector No. 6 Injector No. 3 Injector No. 4

I Idle speed

106 108

B

B ECM ground [Engine is running]

110 112

R/G

R/G Power supply for ECM [Ignition switch “ON”] BATTERY VOLTAGE

(11 - 14V)

111 R Sensors’ power supply [Ignition switch “ON”] Approximately 5V

114 Y/B Communication line (LAN)

I Idle speed Approximately 2V

115 OR Data link connector [Ignition switch “ON”]

I CONSULT-II or GST is disconnected. Approximately 2V

★: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)