Infiniti F50. Manual - part 273

TROUBLE DIAGNOSIS

BRC-35

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Solenoid Valve Operation Chart

*: ON for 1 to 2 seconds after the touch, and then OFF

NOTE:

●

If active test is performed with brake pedal depressed, pedal stroke may change. This is normal.

●

“TEST STOP” is displayed approximately 6 seconds after operation starts.

●

After “TEST STOP” is displayed, to perform test again, repeat step 6.

VDC OFF Indicator Lamp

Touch “ON” and “OFF” on the screen. Check that VDC  OFF indica-
tor lamp operates as shown in table below.

NOTE:
If “OFF” is touched on screen during active test, VDC  OFF indicator
lamp, SLIP indicator lamp, and ABS warning lamp all turn ON for a
moment. This is normal.

ABS Motor

Touch “ON” and “OFF” on the screen. Check that ABS motor relay
operates as shown in table below.

NOTE:

●

If active test is performed with brake pedal depressed, pedal
stroke may change. This is normal.

●

“TEST STOP” is displayed approximately 10 seconds after oper-
ation starts.

Operation

ABS solenoid valve

ABS solenoid valve (ACT)

UP

KEEP

DOWN

UP

ACT UP

ACT KEEP

FR RH 
ABS SOLENOID

EV SIGNAL FR (IN)

OFF

ON

ON

OFF

OFF

OFF

AV SIGNAL FR (OUT)

OFF

OFF

ON*

OFF

OFF

OFF

USV SIGNAL S 

OFF

OFF

OFF

OFF

ON

ON

MAV SIGNAL S 

OFF

OFF

OFF

OFF

ON*

OFF

FR LH 
ABS SOLENOID

EV SIGNAL FL (IN)

OFF

ON

ON

OFF

OFF

OFF

AV SIGNAL FL (OUT)

OFF

OFF

ON*

OFF

OFF

OFF

USV SIGNAL S 

OFF

OFF

OFF

OFF

ON

ON

MAV SIGNAL S 

OFF

OFF

OFF

OFF

ON*

OFF

RR RH 
ABS SOLENOID

EV SIGNAL RR (IN)

OFF

ON

ON

OFF

OFF

OFF

AV SIGNAL RR (OUT)

OFF

OFF

ON*

OFF

OFF

OFF

USV SIGNAL P 

OFF

OFF

OFF

OFF

ON

ON

MAV SIGNAL P 

OFF

OFF

OFF

OFF

ON*

OFF

RR LH 
ABS SOLENOID

EV SIGNAL RL (IN)

OFF

ON

ON

OFF

OFF

OFF

AV SIGNAL RL (OUT)

OFF

OFF

ON*

OFF

OFF

OFF

USV SIGNAL P 

OFF

OFF

OFF

OFF

ON

ON

MAV SIGNAL P 

OFF

OFF

OFF

OFF

ON*

OFF

Operation

ON

OFF

VDC OFF indicator  lamp

ON

OFF

SFIA0803E

Operation

ON

OFF

M/R OUTPUT

ON

OFF

SFIA0804E

BRC-36

TROUBLE DIAGNOSIS

SLIP Indicator Lamp

Touch “ON” and “OFF” on the screen. Check that SLIP indicator
lamp operates as shown in table below.

NOTE:
If “OFF” is touched on screen during active test, VDC  OFF indicator
lamp, SLIP indicator lamp, and ABS warning lamp all turn ON for a
moment. This is normal.

ABS Warning Lamp

Touch “ON” and “OFF” on the screen. Check that ABS warning lamp operates as shown in table below.

NOTE:
If “OFF” is touched on screen during active test, VDC  OFF indicator
lamp, SLIP indicator lamp, and ABS warning lamp all turn ON for a
moment. This is normal.

ASCD Output

Touch “ON” and “OFF” on the screen. Check that ASCD output is as shown in table below.

Operation

ON

OFF

SLIP indicator lamp

ON

OFF

SFIA0594E

Operation

ON

OFF

ABS warning lamp

ON

OFF

SFIA0595E

Operation

ON

OFF

ASCD output

ON

OFF

TROUBLE DIAGNOSIS

BRC-37

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BRC

For Fast and Accurate Diagnosis

EFS001ZA

PRECAUTIONS FOR DIAGNOSIS

●

Before performing diagnosis, always read General Information (GI) to confirm general precautions.

●

If VDC/TCS/ABS control unit, steering angle sensor, steering system parts, suspension system parts, or
tires have been replaced, or if alignment has been adjusted, be sure to adjust neutral position of steering
angle sensor before driving.

●

When replacing VDC/TCS/ABS control unit, be sure labels on control units are same color.

●

After diagnosis is finished, be sure to erase memory. Refer to 

BRC-27, "SELF-DIAGNOSIS"

 .

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When checking continuity and voltage between units, be sure to check for disconnection, looseness,
bend, or collapse of connector terminals. If any non-standard condition is found, repair or replace connec-
tor terminals.

●

For intermittent symptoms, possible cause is malfunction in harness, harness connector, or terminals.
Move harness, harness connector, and terminals to check for poor connections.

●

If a circuit tester is used for the check, be careful not to forcibly extend any connector terminal.

●

To use CONSULT-II to perform self-diagnosis of VDC/TCS/ABS control unit, active tests, or work support,
first stop work, then connect CONSULT-II and CONSULT-II CONVERTER to data link connector and
select “VDC”.

●

CONSULT-II self-diagnosis results are displayed without regard to occurrence timing. In some cases later
ones (timing value is small) appear on the next screen.

●

While self-diagnosis results of CONSULT-II shows an error, if CONSULT-II active test is performed, an
engine system error may be indicated. In this case, start engine to resume normal screen.

●

VDC/TCS/ABS system electronically controls brake operation and engine output. Following symptoms
may be caused by normal operations:

Symptom

Symptom description

Result

Motor operation noise

This is noise of motor inside VDC actuator. Slight noise may occur dur-
ing VDC, TCS, and ABS operation.

Normal

Just after engine starts, motor operating noise may be heard. This is a 
normal status of the system operation check.

System operation check 
noise

When the engine starts, slight “click” noise may be heard from engine 
compartment. This is normal and is part of system operation check.

Normal

TCS operation
(SLIP lamp ON)

TCS may activate momentarily if wheel speed changes when driving 
over location where friction coefficient varies, when downshifting, or 
when fully depressing accelerator pedal.

Normal
Cancel VDC/TCS 
function for the 
inspection on a chas-
sis dynamometer.

For inspection of speedometer or other instruments, press 
VDC OFF SW to turn VDC/TCS function off.

When accelerator pedal is depressed on a chassis dynamometer (fixed 
front-wheel type), vehicle speed will not increase. This is not normal. It is 
result of TCS being activated by stationary front wheels. Warning lamp 
may also illuminate to indicate “sensor system error”. This is also nor-
mal, and is the result of the stationary front wheels being detected. To be 
certain, restart engine, and drive vehicle at 30 km/h or above. Check 
that warning lamp does not illuminate.

ABS operation (Longer stop-
ping distance)

On roads with low friction coefficients, such as snowy roads or gravel 
roads, vehicles with ABS may require a longer stopping distance. There-
fore, when driving on such roads, avoid overconfidence and keep speed 
sufficiently low.

Normal

Insufficient feeling of accel-
eration

Depending on road conditions, driver may feel that feeling of accelera-
tion is insufficient. This is because traction control, which controls 
engine and brakes to achieve optimal traction, has the highest priority 
(for safety). As a result, there may be times when acceleration is slightly 
less than usual for the same accelerator pedal operation.

Normal

BRC-38

TROUBLE DIAGNOSIS

ON and OFF Timing for ABS Warning Lamp, VDC OFF Indicator Lamp, and SLIP Indicator 
Lamp

×

: ON

–: OFF

Condition

ABS warning 

lamp

VDC OFF indica-

tor lamp

SLIP indicator 

lamp

Remarks

Ignition SW OFF

–

–

–

—

For Approx. 1 seconds after 
ignition SW  is turned ON

×

×

×

—

Approx.1 seconds after igni-
tion switch ON

–

–

–

Turns OFF 1 seconds after engine 
starts.

VDC OFF SW is turned ON. 
(VDC function is OFF.)

–

×

–

—

There is a VDC/TCS/ABS
error.

×

×

×

—

×

×

–

There is a VDC/TCS/ABS  control 
unit error. (Power or ground mal-
function)

When VDC/TCS is not func-
tioning normally.

–

×

×

—