Infiniti F50. Manual - part 751

TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS

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TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS

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Inspection 1: Vehicle Speed Sensor

EES000ES

1. 

CHECK INPUT SIGNAL

●

Check control unit input signal.

Inspection results OK?

OK

>> GO TO 2.

NG

>> Replace control unit.

2. 

CHECK COMBINATION METER

●

Does combination meter operate properly?

Inspection results OK?

OK

>> Repair or replace speed sensor or vehicle speed sensor-to-control unit harness.

NG

>> Repair or replace combination meter circuit.

Inspection 2: Steering Angle Sensor

EES000ET

1. 

CHECK CONTROL UNIT INPUT SIGNAL

●

Slowly turn the steering wheel at least 90

°

 to the right (or the

left) from neutral.

●

Measure voltage between control unit connector terminals 1(L/
R), 2 (Y/B) and body ground, 20 (G/R) and body ground.

Inspection results OK?

OK

>> Replace control unit.

NG

>> GO TO 2.

2. 

CHECK STEERING ANGLE SENSOR OUTPUT SIGNAL

●

Slowly turn the steering wheel at least 90

°

 to left or right from neutral.

●

Measure voltage between steering angle sensor connector ter-
minals 6 (L/R), 7 (Y/B)and body ground, 8 (G) and body ground.

Inspection results OK?

OK

>> Repair or replace control unit-to-steering angle sensor

harness.

NG

>> GO TO 3.

Refer to 

EC-99, "ECM INSPECTION TABLE"

 .

1 (L/R), 2 (Y/B) - Body ground

: Varies 0 - approx. 5V

20 (G/R) - Body ground

: Approx. 5V
 (Neutral position)

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6 (L/R), 7 (Y/B) - 
Body ground

: Repeats approx. 0 - 5V

8 (G) - Body 
ground

: Neutral position approx. 5V

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TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS

3. 

CHECK STEERING ANGLE SENSOR POWER SUPPLY CIRCUIT

●

Measure voltage between steering angle sensor connector ter-
minals 3 (SB) and body ground.

Inspection results OK?

OK

>> GO TO 4.

NG

>> Repair or replace power circuit or steering angle sensor.

4. 

CHECK STEERING ANGLE SENSOR GROUND CIRCUIT

●

Check continuity between steering angle sensor connector ter-
minal 2 (B) and body ground.

Inspection results OK?

OK

>> Replace steering angle sensor.

NG

>> Repair or replace ground harness.

Inspection 3: Stop Lamp Switch

EES000EU

1. 

CHECK CONTROL UNIT INPUT SIGNAL

●

Measure voltage between control unit connector terminal 11 (L/
B) and body ground.

Inspection results OK?

OK

>> GO TO 2.

NG

>> Repair or replace control unit-to-stop lamp switch har-

ness.

2. 

CHECK STOP LAMP

●

Does the stop lamp light up when brake pedal is depressed?

Inspection results OK?

OK

>> Repair or replace control unit-to-body ground harness or control unit.

NG

>> Repair or replace battery-to-stop lamp switch harness or stop lamp switch.

3 (SB) - Body ground

: Battery voltage

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2 (B) - Body ground

: Continuity should exist

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11 (L/B) - Body ground

Brake pedal depressed

: Battery voltage

Brake pedal released

: Approx. 0V

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TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS

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Inspection 4: Vertical G sensor

EES000EV

1. 

CHECK CONTROL UNIT VERTICAL G SENSOR POWER SUPPLY CIRCUIT

●

Measure voltage between control unit connector terminal 3 (W)
and body ground.

Inspection results OK?

OK

>> GO TO 2.

NG

>> Replace control unit.

2. 

CHECK CONTROL UNIT VERTICAL G SENSOR GROUND CIRCUIT

●

Check continuity between control unit connector terminal 7 (R/Y)
and vertical G sensor connector terminal 3 (R/Y).

Inspection results OK?

OK

>> GO TO 2.

NG

>> Check harness open or short between control unit and

vertical G sensor.

3. 

CHECK CONTROL UNIT VERTICAL G SENSOR INPUT SIGNAL

●

Measure voltage between control unit connector terminals 4, 5
and body ground.

Inspection results OK?

OK

>> Replace control unit.

NG

>> GO TO 4.

4. 

CHECK CONTROL UNIT VERTICAL G SENSOR INPUT SIGNAL CIRCUIT

●

Check continuity between control unit connector terminals 4 (R/
G),6 (W/L) and body ground.

Inspection results OK?

OK

>> GO TO 5.

NG

>> Repair or replace control unit-to-vertical G sensor har-

ness.

3 (W)- Body ground

: Approx. 5V

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7 (R/Y)- 3 (R/Y)

: Continuity should exist.

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4 (R/G), 5 (W/L)- Body ground

: Approx. 5V

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4 (R/G), 5 (W/L) - Body ground:

 Continuity should not exist

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TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS

5. 

CHECK VERTICAL G SENSOR POWER SUPPLY CIRCUIT

●

Measure voltage between vertical G sensor connector terminal
1 (W) and body ground.

Inspection results OK?

OK

>> GO TO 6.

NG

>> Repair or replace control unit-to-vertical G sensor har-

ness.

6. 

CHECK VERTICAL G SENSOR OUTPUT SIGNAL

●

Measure voltage between vertical G sensor connector terminal
2 (B3:R/G or B227:W/L) and body ground

Inspection results OK?

OK

>> Repair or replace control unit-to-vertical G sensor har-

ness.

NG

>> Replace vertical G sensor.

NOTE:
The front vertical G sensor is installed on the rear of the inner pillar and the rear vertical G sensor is located on
the rear of the outer wheelhouse. To check each vertical G sensor output signal, remove the vertical G sensor,
set it vertical, then measure voltage between terminals.
Be careful not to drop or bump the vertical G sensor as it is easy to break. If dropped or bumped, replace with
a new one.

1 (W) - Body ground

: Approx. 5V

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2 (B3:R/G or B227:W/L)- Body ground

: Approx. 5V

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