Nissan 350Z Workshop Maunual 2006 (9) PDF | Page 62

BRC-62
[TCS/ABS]
TROUBLE DIAGNOSIS
Revision: 2005 August 2006 350Z
Correct and Quick Diagnosis NFS00036
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-56, "ERASE MEMORY" .
? 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.
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 oper-
ating.
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, suddenly
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 more or higher to
check that the warning lamp no longer turns on.
ABS operation
(longer stopping 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

Summary of Content

BRC-62[TCS/ABS]TROUBLE DIAGNOSISRevision: 2005 August 2006 350ZCorrect and Quick Diagnosis NFS00036DIAGNOSIS 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-56, "ERASE MEMORY" . 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.Symptom 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 oper-ating.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, suddenly 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 more or higher to check that the warning lamp no longer turns on.ABS operation(longer stopping 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.Normal