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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SYMPTOM TROUBLESHOOTING

04–03–4

•

After repairing the ABS wheel-speed sensor or ABS sensor rotor, or after replacing the ABS HU/CM
(ABS motor or ABS motor relay or solenoid valve), the ABS warning light may not go off even when the
ignition switch is turned on. In this case, drive the vehicle at a speed of more than 10 km/h {6.2 mph},
make sure the ABS warning light goes off, and then erase the DTC.

•

When repairing, if the ABS related connectors are disconnected and the ignition switch is turned on, the
ABS HU/CM will mistakenly detect a fault and record it as a malfunction.

•

To protect the ABS HU/CM, make sure the ignition is off before connecting or disconnecting the ABS
HU/CM connector.

•

To protect the terminal, use the SST (49 G066 001) when connecting the tester lead to the ABS HU/CM
connector.

(2) Malfunctions in hydraulic system

•

Symptoms in a hydraulic system malfunction are similar to those in a conventional brake malfunction.
However, it is necessary to determine if the malfunction is in an ABS component or the conventional
brake system.

•

The ABS hydraulic unit contains delicate mechanical parts. If foreign materials get into the component,
the ABS may fail to operate. Also, it will likely become extremely difficult to find the location of the
malfunction in the event that the brakes operate but the ABS does not. Make sure foreign materials do
not get inside when servicing the ABS (e.g. brake fluid replacement, pipe removal).

End Of Sie

SYMPTOM TROUBLESHOOTING

A3U040343000W04

ABS Symptom Troubleshooting

•

Verify the symptom, and perform troubleshooting according to the appropriate number.

No.

TROUBLESHOOTING ITEM

DESCRIPTION

PAGE

1

Neither ABS warning light nor BRAKE
system warning light illuminate

Neither ABS warning light nor BRAKE
system warning light illuminate with
ignition switch on.

(See 04–03–5 NO.1 NEITHER
ABS WARNING LIGHT NOR
BRAKE SYSTEM WARNING
LIGHT ILLUMINATE)

2

ABS warning light does not illuminate

ABS warning light does not illuminate
with ignition switch on.

(See 04–03–6 NO.2 ABS
WARNING LIGHT DOES NOT
ILLUMINATE)

3

BRAKE system warning light does not
illuminate

BRAKE system warning light does not
illuminate with ignition switch on.

(See 04–03–7 NO.3 BRAKE
SYSTEM WARNING LIGHT
DOES NOT ILLUMINATE)

4

ABS warning light and BRAKE system
warning light stay ON

Both ABS warning light BRAKE system
warning light stay on more than 4
seconds with ignition switch on.

(See 04–03–8 NO.4 ABS
WARNING LIGHT AND
BRAKE SYSTEM WARNING
LIGHT STAY ON)

5

ABS warning light stays ON

ABS warning light stays on more than 4
seconds with ignition switch on.

(See 04–03–10 NO.5 ABS
WARNING LIGHT STAYS ON)

6

BRAKE system warning light stays ON BRAKE system warning light stays on

more than 4 seconds with ignition
switch on. (Parking brake is released)

(See 04–03–12 NO.6 BRAKE
SYSTEM WARNING LIGHT
STAYS ON)

7

BRAKE system malfunction

There is a malfunction in system even
though ABS warning light and BRAKE
system warning light does not illuminate.

(See 04–03–13 NO.7 BRAKE
SYSTEM MALFUNCTION)

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SYMPTOM TROUBLESHOOTING

04–03–5

04–03

Quick Diagnosis Chart
Vehicles with ABS

End Of Sie

NO.1 NEITHER ABS WARNING LIGHT NOR BRAKE SYSTEM WARNING LIGHT ILLUMINATE

A3U040343000W05

•

When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors while
performing the inspection to discover whether poor contact points are the cause of any intermittent
malfunctions. If there is a problem, check to make sure connectors, terminals and wiring harness are
connected correctly and undamaged.

Diagnostic procedure

Y3U403WA1

1

Neither ABS warning light nor BRAKE system warning light illuminate

DESCRIPTION

•

Neither ABS warning light nor BRAKE system warning light illuminate with ignition switch on.

POSSIBLE

CAUSE

•

Warning light circuit and indicator light circuits open circuit or shorted to ground.

STEP

INSPECTION

ACTION

1

CHECK TO SEE WHETHER MALFUNCTION
IS IN WARNING LIGHTS’ COMMON POWER
SUPPLY OR OTHER WARNING LIGHTS AND
INDICATOR LIGHTS

•

Do other warning and indicator lights
illuminate when IG switch is turned ON?

Yes

Replace instrument cluster (open circuit in instrument
cluster).

No

Go to next step.

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SYMPTOM TROUBLESHOOTING

04–03–6

End Of Sie

NO.2 ABS WARNING LIGHT DOES NOT ILLUMINATE

A3U040343000W06

•

When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors while
performing the inspection to discover whether poor contact points are the cause of any intermittent
malfunctions. If there is a problem, check to make sure connectors, terminals and wiring harness are
connected correctly and undamaged.

Diagnostic procedure

2

CHECK TO SEE WHETHER MALFUNCTION
IS IN WARNING LIGHTS’ COMMON GROUND
OR TURN SIGNAL INDICATOR LIGHT

•

Turn ignition switch ON.

•

Turn signal switch ON.

•

Does turn signal indicator light in instrument
cluster illuminate?

Yes

Replace instrument cluster (open circuit in instrument
cluster).

No

Go to next step.

3

INSPECT INSTRUMENT CLUSTER POWER
SUPPLY FUSE

•

Is instrument cluster ignition power supply
fuse okay?

Yes

Go to next step.

No

Check for a short to ground on blown fuse's circuit.
Repair or replace as necessary.
Install appropriate amperage fuse.

*4

INSPECT WIRING HARNESS BETWEEN
INSTRUMENT CLUSTER POWER SUPPLY
AND INSTRUMENT CLUSTER FOR
CONTINUITY

•

Turn ignition switch ON.

•

Measure voltage at instrument cluster
connector (18-pin) terminal 1J.

•

Is voltage approximately 12V?

Yes

Go to next step

No

Repair wiring harness between fuse block and instrument
cluster.

*5

CHECK TO SEE WHETHER MALFUNCTION
(LACK OF CONTINUTY) IS IN WIRING
HARNESS (BETWEEN INSTRUMENT
CLUSTER AND GROUND) OR INSTRUMENT
CLUSTER

•

Turn ignition switch to LOCK.

•

Disconnect instrument cluster connector.

•

Is there continuity between instrument
cluster connector (18-pin) terminal 1D and
ground?

Yes

Replace instrument cluster (open circuit in instrument
cluster).

No

Repair wiring harness between instrument cluster and
ground.

STEP

INSPECTION

ACTION

2

ABS warning light does not illuminate

DESCRIPTION

•

ABS warning light does not illuminate with ignition switch on.

POSSIBLE

CAUSE

•

ABS warning light circuit open circuit or shorted to ground.

STEP

INSPECTION

ACTION

1

CHECK FOR SHORT TO GROUND IN ABS
HU/CM

•

Disconnect ABS HU/CM connector and turn
ignition switch on.

•

Does ABS warning light illuminate?

Yes

Replace ABS HU/CM (short to ground in ABS HU/CM).

No

Go to next step.

2

INSPECT ABS WARNING LIGHT BULB

•

Remove instrument cluster.

•

Inspect ABS warning light bulb.

•

Is it okay?

Yes

Go to next step.

No

Replace ABS warning light bulb.

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