Infiniti F50. Manual — part 751
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
SCS-21
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TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
PFP:00000
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
.
1 (L/R), 2 (Y/B) - Body ground
: Varies 0 - approx. 5V
20 (G/R) - Body ground
: Approx. 5V
(Neutral position)
SEIA0274E
6 (L/R), 7 (Y/B) -
Body ground
: Repeats approx. 0 - 5V
8 (G) - Body
ground
: Neutral position approx. 5V
SEIA0082E
SCS-22
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
SEIA0275E
2 (B) - Body ground
: Continuity should exist
SEIA0276E
11 (L/B) - Body ground
Brake pedal depressed
: Battery voltage
Brake pedal released
: Approx. 0V
SEIA0277E
TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS
SCS-23
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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
SEIA0278E
7 (R/Y)- 3 (R/Y)
: Continuity should exist.
SEIA0283E
4 (R/G), 5 (W/L)- Body ground
: Approx. 5V
SEIA0279E
4 (R/G), 5 (W/L) - Body ground:
Continuity should not exist
SEIA0280E
SCS-24
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
SEIA0281E
2 (B3:R/G or B227:W/L)- Body ground
: Approx. 5V
SEIA0282E
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