Nissan 350Z Workshop Manual 2003 (9) PDF | Page 74

BRC-74
[TCS/ABS]
TROUBLE DIAGNOSIS
Correct and Quick Diagnosis
AFS000YW
DIAGNOSIS PRECAUTIONS
? Before performing the trouble diagnosis, always read the general information (GI) to confirm the general
precautions. Refer to GI-4, "
General Precautions" .
? After completing service, always erase the self-diagnosis results. Refer to BRC-65, "CONSULT- II Func-
tions" .
? When inspection of the continuity or voltage between units is performed, check connector terminals for
disconnection, looseness, bend, or collapse. If any non-standard condition is detected, repair or replace
applicable part.
? Intermittent errors may be caused by a poor connection in the harness, connector, or terminal. Move har-
nesses, harness connectors, or terminals by hand to make sure all connections are solid and undamaged.
? If a circuit tester is used for the check, be careful not to forcibly extend any connector terminal.
? TCS/ABS is a system that uses electronic control to perform brake control and engine power control.
Therefore, phenomena like those shown in the following table may occur, but this is because the system is
working normally.
ABS Warning Lamp, TCS OFF Indicator Lamp, SLIP Indicator Lamp On/Off Timing
: ON ?: OFF
Symptom Symptom description Result
Motor operation noise
This is the sound of the motor operating inside ABS actuator and electric
unit (control unit), and there may be some low sounds while TCS or ABS
is operating.
Normal
Just after the engine starts, the motor operating noise may be heard.
This is a normal status of the system operation check.
System operation check
noise
When the engine is started, you may barely be able to hear a slight
thudding sound from the engine room, but this sound is made by the
system operation check and is normal.
Normal
TCS operation
(SLIP indicator lamp ON)
TCS may be activated any time the vehicle suddenly accelerates, sud-
denly downshifts, or is driven on a road with a varying surface friction
coefficient.
Normal
When conducting the
inspection on a chas-
sis dynamometer,
cancel the TCS func-
tion.
When inspecting the speedometer, etc., press TCS OFF switch to turn
off TCS function before conducting the work.
When accelerator pedal is depressed on a chassis dynamometer (front
wheel fixing type), the vehicle speed will not increase. This is normal,
because TCS is activated by the stationary front wheels. The warning
lamp may also turn on to show ?sensor system error? in this case. This is
not a malfunction either, because the stationary front wheels are
detected. Restart engine, and drive the vehicle at 30 km/h (19 MPH) or
higher to check that the warning lamp no longer turns on.
ABS operation (longer stop-
ping distance)
Stopping distance may be longer for vehicles with ABS when the vehicle
drives on rough or snow-covered roads. Use lower speeds when driving
on these kinds of roads.
Normal
Sluggish feel
Depending on road circumstances, the driver may have a sluggish feel.
This is normal, because under TCS operation optimum traction has the
highest priority (safety first). Sometimes the driver has a slight sluggish
feel in response to substantial accelerator pedal operation.
Normal
Condition
ABS warning
lamp
TCS OFF indicator
lamp
SLIP indicator
lamp
Remarks
Ignition switch OFF ? ? ? ?
For approximately ?1? sec-
ond after ignition switch ON
?
After approximately ?1? sec-
ond after ignition switch ON
(When system is normal)
???
Turns off 2 second after engine
start
When the TCS OFF switch is
turned on (TCS function off)
? ??

Nissan 350Z Workshop Manual 2003 (9) Summary of Content

BRC-74[TCS/ABS]TROUBLE DIAGNOSISCorrect and Quick DiagnosisAFS000YWDIAGNOSIS PRECAUTIONS Before performing the trouble diagnosis, always read the general information (GI) to confirm the generalprecautions. Refer to GI-4, "General Precautions" . After completing service, always erase the self-diagnosis results. Refer to BRC-65, "CONSULT- II Func-tions" . When inspection of the continuity or voltage between units is performed, check connector terminals fordisconnection, looseness, bend, or collapse. If any non-standard condition is detected, repair or replaceapplicable part. Intermittent errors may be caused by a poor connection in the harness, connector, or terminal. Move har-nesses, harness connectors, or terminals by hand to make sure all connections are solid and undamaged. If a circuit tester is used for the check, be careful not to forcibly extend any connector terminal. TCS/ABS is a system that uses electronic control to perform brake control and engine power control.Therefore, phenomena like those shown in the following table may occur, but this is because the system isworking normally.ABS Warning Lamp, TCS OFF Indicator Lamp, SLIP Indicator Lamp On/Off Timing: ON : OFFSymptom Symptom description ResultMotor operation noiseThis is the sound of the motor operating inside ABS actuator and electric unit (control unit), and there may be some low sounds while TCS or ABS is operating.NormalJust after the engine starts, the motor operating noise may be heard. This is a normal status of the system operation check.System operation check noiseWhen the engine is started, you may barely be able to hear a slight thudding sound from the engine room, but this sound is made by the system operation check and is normal.NormalTCS operation(SLIP indicator lamp ON)TCS may be activated any time the vehicle suddenly accelerates, sud-denly downshifts, or is driven on a road with a varying surface friction coefficient.NormalWhen conducting the inspection on a chas-sis dynamometer, cancel the TCS func-tion.When inspecting the speedometer, etc., press TCS OFF switch to turn off TCS function before conducting the work. When accelerator pedal is depressed on a chassis dynamometer (front wheel fixing type), the vehicle speed will not increase. This is normal, because TCS is activated by the stationary front wheels. The warning lamp may also turn on to show sensor system error in this case. This is not a malfunction either, because the stationary front wheels are detected. Restart engine, and drive the vehicle at 30 km/h (19 MPH) or higher to check that the warning lamp no longer turns on.ABS operation (longer stop-ping distance)Stopping distance may be longer for vehicles with ABS when the vehicle drives on rough or snow-covered roads. Use lower speeds when driving on these kinds of roads.NormalSluggish feelDepending on road circumstances, the driver may have a sluggish feel. This is normal, because under TCS operation optimum traction has the highest priority (safety first). Sometimes the driver has a slight sluggish feel in response to substantial accelerator pedal operation.NormalConditionABS warning lampTCS OFF indicator lampSLIP indicator lampRemarksIgnition switch OFF For approximately 1 sec-ond after ignition switch ON After approximately 1 sec-ond after ignition switch ON(When system is normal)Turns off 2 second after engine startWhen the TCS OFF switch is turned on (TCS function off)