Mazda Protege 5. Manual - part 205
SYMPTOM TROUBLESHOOTING
04–03–3
04–03
FOREWORD
A3U040343000W02
•
Before performing the steps in Symptom Troubleshooting, perform the On-board Diagnostic Test. To check the
DTC, follow the OBD TEST steps.
End Of Sie
ABS
A3U040343000W03
Foreword
•
Before performing the steps in Symptom Troubleshooting, perform the On-board Diagnostic Inspection. To
check the DTC, follow the DTC Inspection steps.
Precaution
When inspecting or servicing the ABS, note the following points:
1. The ABS warning light and/or BRAKE system warning light illuminate even when the system is normal.
*
1
: In cases where the light may illuminate, only when ABS HU/CM detects that a rear wheel’s speed sensor is
malfunctioning.
*
2
: If battery voltage drops below about 9 to 10 V while vehicle speed is greater than 6 km/h {3.7 mph}, ABS
HU/CM records DTC B1318 (DTC 63).
2. Precautions during servicing of ABS
The ABS is composed of electrical and mechanical parts. It is necessary to categorize malfunctions as being
either electrical or hydraulic when performing troubleshooting.
(1) Malfunctions in electrical system
•
The ABS hydraulic unit and control module (ABS HU/CM) has an on-board diagnostic function. With
this function, the ABS warning light and/or BRAKE system warning light will come on when there is a
problem in the electrical system. Also, past and present malfunctions are recorded in the ABS HU/CM.
This function can find malfunctions that do not occur during periodic inspections. Turn the ignition
switch on by connecting the SST (WDS or equivalent) to the DLC-2 inside the Passenger comportment.
Approximately 5 seconds later the stored malfunctions will be displayed in order of occurrence. To
find out the causes of ABS malfunctions, use these on-board diagnostic results.
•
If a malfunction occurred in the past but is now normal, the cause is likely a temporary poor connection
of the harness. The ABS HU/CM usually operates normally. Be careful when searching for the cause of
malfunction.
•
After repair, it is necessary to erase the DTC from the ABS HU/CM memory. Also, if the ABS related
parts have been replaced, verify that the no DTC has been displayed after repairs.
Warning lights that may
illuminate
Cases in which the light
may illuminate
Condition in which the light
will go out
ABS and EBD control
•
ABS warning light
•
BRAKE system warning
light (*
1
)
Under any of the following
conditions:
•
When the front wheels are
jacked up, stuck, or placed
on a chassis roller, and
only the front wheel ABS
wheel speed sensors are
spun for more than 20
seconds.
After turning ignition switch
OFF, vehicle is driven at
speed greater than 10 km/h
{6.2 mph} and normal
operation is confirmed.
•
ABS: Cuts control.
•
EBD:
1. Cuts control, in cases
where the light may
illuminate, only when
ABS HU/CM detects
that a wheel speed
sensor determines that
more than 2 rear
wheels are
malfunctioning.
2. Operates control, if
wheel speed sensor
determines that more
than 3 wheels are
functioning correctly.
Parking brake is not fully
released while driving.
Brake drag.
Sudden acceleration/
deceleration.
Left/ right or front/ rear tires
are different. (Size, radius, tire
pressure, or wear is other
than that listed on tire label.)
•
ABS warning light
Battery voltage at ABS HU/
CM ignition terminal Z drops
below about 9 to 10 V. (*
2
)
Battery voltage rises above
about 10 V.
ABS: Operates control.
EBD: Operates control.
•
ABS warning light
•
BRAKE system warning
light
Battery voltage at ABS HU/
CM ignition terminal Z drops
below about 9 to 10 V. (*
2
)
Battery voltage rises above
about 10 V.
(Only BRAKE system warning
light goes out.)
Battery voltage rises above
about 10 V. (Both warning
lights go out)
ABS: Operates control.
EBD: Operates control.
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