Mazda Protege 5. Manual — part 206

SYMPTOM TROUBLESHOOTING

04–03–7

04–03

End Of Sie

NO.3 BRAKE SYSTEM WARNING LIGHT DOES NOT ILLUMINATE

A3U040343000W07

•

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

End Of Sie

*3

CHECK TO SEE WHETHER MALFUNCTION
IS IN WIRING HARNESS (SHORT TO
GROUND BETWEEN INSTRUMENT
CLUSTER AND ABS HU/CM) OR
INSTRUMENT CLUSTER (OPEN CIRCUIT OR
SHORT TO GROUND)

•

Is there continuity between instrument
cluster connector (16-pin) terminal 2B and
ground?

Yes

Repair wiring harness between instrument cluster and ABS
HU/CM.

No

Replace instrument cluster (open circuit or short to ground
in ABS HU/CM).

STEP

INSPECTION

ACTION

3

BRAKE system warning light does not illuminate

DESCRIPTION

•

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

POSSIBLE

CAUSE

•

Open circuit or short to ground in BRAKE system warning light circuit.

STEP

INSPECTION

ACTION

1

CHECK FOR SHORT TO GROUND IN ABS
HU/CM

•

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

•

Does BRAKE system warning light
illuminate?

Yes

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

No

Go to next step.

2

INSPECT BRAKE SYSTEM WARNING LIGHT
BULB

•

Remove instrument cluster.

•

Inspect BRAKE system warning light bulb.

•

Is it okay?

Yes

Go to next step.

No

Replace BRAKE system warning light bulb.

*3

CHECK TO SEE WHETHER MALFUNCTION
IS IN WIRING HARNESS (SHORT TO
GROUND BETWEEN INSTRUMENT
CLUSTER AND ABS HU/CM) OR
INSTRUMENT CLUSTER (OPEN OR SHORT
TO GROUND)

•

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

Yes

Repair wiring harness between instrument cluster and ABS
HU/CM.

No

Replace instrument cluster (open circuit or short to ground
in ABS HU/CM).

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SYMPTOM TROUBLESHOOTING

04–03–8

NO.4 ABS WARNING LIGHT AND BRAKE SYSTEM WARNING LIGHT STAY ON

A3U040343000W08

•

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

4

ABS warning light and BRAKE system warning light stay ON

DESCRIPTION

•

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

POSSIBLE

CAUSE

•

ABS HU/CM detects ABS proportioning system malfunction

•

ABS HU/CM detects low voltage in power supply (ABS HU/CM ignition terminal Z voltage is below
about 8 to 9 V)

•

ABS HU/CM does not operate

•

Both warning light circuits (ABS and BRAKE system) open circuit or shorted to ground

STEP

INSPECTION

ACTION

1

INSPECT ABS HU/CM POWER SUPPLY FUSE

•

Is ABS HU/CM 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.

2

INSPECT WIRING HARNESS BETWEEN ABS
CM AND DLC-2 FOR CONTINUITY OR
SHORTS

•

Perform DTC inspection.

•

Is error message displayed regarding
communication between ABS HU/CM and
WDS or equivalent?

Yes

If a communication error message is displayed even after
inspecting according to procedures displayed on the WDS
or equivalent, go to Step 8.

No

Go to next step.

3

CHECK FOR DTCS IN ABS HU/CM

•

Have DTCs been recorded in memory?

Yes

Perform inspection using appropriate DTC.

No

Go to next step.

4

INSPECT PID/DATA IN ABS HU/CM

•

Inspect the following items using WDS or
equivalent.
— ABS_LAMP (ABS warning light)
— BRAKE_LMP (BRAKE system warning

light)

— ABS_VOLT (power supply voltage)

•

Is ABS_LAMP and BRAKE_LMP ON after
more than 4 seconds with ignition switch
on?

Yes

Go to Step 7.

No

Go to next step.

5

CHECK FOR OPEN CIRCUITS IN ABS HU/CM

•

Disconnect ABS HU/CM. Connect the SST
(49 G066 001) (vehicle harness side only).

•

Use the SST connector to ground the
warning light terminal (ABS: terminal W,
BRAKE system: terminal X) to body ground.

•

Do both ABS warning light and BRAKE
system warning light go out with ignition
switch on?

Yes

Replace ABS HU/CM (open circuit in ABS HU/CM).

No

Go to next step.

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SYMPTOM TROUBLESHOOTING

04–03–9

04–03

*6

CHECK TO SEE WHETHER MALFUNCTION
IS IN WIRING HARNESS (LACK OF
CONTINUITY BETWEEN INSTRUMENT
CLUSTER AND ABS HU/CM) OR
INSTRUMENT CLUSTER (OPEN CIRCUIT OR
SHORT TO GROUND)

•

Disconnect instrument cluster connector.

•

Is there continuity between following ABS
HU/CM connector terminals and instrument
cluster connector terminals?
— Terminal W and terminal 2B (16-pin)
— Terminal X and terminal 1G (18-pin)

Yes

Replace instrument cluster (open circuit or short to ground
in instrument cluster).

No

Repair wiring harness between ABS HU/CM (ABS: terminal
W, BRAKE system: terminal X) and instrument cluster.

7

INSPECT ABS HU/CM IGNITION POWER
SUPPLY SYSTEM (TERMINAL Z)

•

Check the voltage for PID/DATA monitor
ABS_VOLT item.
Specification: above 10 V

•

Is voltage within specification?

Yes

Replace ABS HU/CM (open circuit or short in ground circuit
in ABS HU/CM).

No

Go to next step.

8

INSPECT BATTERY

•

Is battery voltage normal?

Yes

Go to next step.

No

Inspect battery and charging system.

9

INSPECT CHARGING SYSTEM

•

Is battery voltage normal with electrical load
(A/C, headlights, etc.) on and engine idling?

Yes

Go to next step.

No

Inspect charging system (drive belt tension, generator, etc.).

10

VERIFY THAT ABS HU/CM CONNECTOR IS
CONNECTED WITH ABS HU/CM

•

Is ABS HU/CM securely connected?

Yes

Go to Step 12.

No

Connect ABS HU/CM connector securely, then go to next
step.

11

CONFIRM THAT MALFUNCTION SYMPTOM
DO NOT REOCCUR AFTER ABS HU/CM IS
CONNECTED

•

Do both ABS warning light and BRAKE
system warning lights go out after more than
4 seconds with ignition switch on?

Yes

Temporary poor connection in ABS HU/CM connector.
Inspect connector and terminal.

No

Go to next step.

12

VERIFY THAT ABS HU/CM CONNECTOR
TERMINALS Z AND AA ARE CONNECTED

•

Does malfunction symptom happen again
when ABS HU/CM connector terminals Z
and AA are shaken while the ignition switch
is ON?

Yes

Connect ABS HU/CM connector terminals Z and AA
securely, then go to next step.

No

Go to Step 14.

13

CONFIRM THAT MALFUNCTION SYMPTOM
DO NOT REOCCUR AFTER ABS HU/CM
CONNECTOR TERMINALS Z AND AA ARE
CONNECTED

•

Do both ABS warning light and BRAKE
system warning lights go out after more than
4 seconds with ignition switch on?

Yes

Temporary poor connection at terminal.
Inspect ABS HU/CM connector and terminal.

No

Go to next step.

*14

INSPECT WIRING HARNESS BETWEEN ABS
HU/CM POWER SUPPLY AND ABS HU/CM
FOR CONTINUITY

•

Disconnect ABS HU/CM connector. Connect
the SST (49 G066 001) (vehicle harness side
only).

•

Is voltage approximately 12 V at SST
connector terminal Z?

Yes

Go to next step.

No

Repair wiring harness between fuse block and ABS HU/CM.

*15

INSPECT WIRING HARNESS BETWEEN ABS
HU/CM AND GROUND FOR CONTINUITY

•

Turn ignition switch to LOCK.

•

Is there continuity between SST connector
terminal AA and ground?

Yes

If a communication error message is displayed on WDS or
equivalent in Step 1 inspection, go to next step.
If a communication error message is not displayed on WDS
or equivalent in Step 1 inspection, troubleshooting is
completed.

No

Repair wiring harness between ABS HU/CM and ground.

*16

INSPECT WIRING HARNESS BETWEEN ABS
HU/CM AND DLC-2 FOR CONTINUITY

•

Is there continuity between SST connector
terminal T and DLC-2?

Yes

Go to next step.

No

Repair wiring harness between ABS HU/CM and DLC-2.

STEP

INSPECTION

ACTION

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SYMPTOM TROUBLESHOOTING

04–03–10

End Of Sie

NO.5 ABS WARNING LIGHT STAYS ON

A3U040343000W09

•

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

*17

INSPECT WIRING HARNESS BETWEEN ABS
HU/CM AND DLC-2 FOR SHORT TO B+

•

Is voltage approximately 12 V at SST
connector terminal T?

Yes

Repair wiring harness between ABS HU/CM and DLC-2.

No

Go to next step.

*18

INSPECT WIRING HARNESS BETWEEN ABS
HU/CM AND DLC-2 FOR SHORT TO GROUND

•

Is there continuity between SST connector
terminal T and ground?

Yes

Repair wiring harness between ABS HU/CM and DLC-2.

No

Replace ABS HU/CM (communication circuit malfunction in
ABS HU/CM).

STEP

INSPECTION

ACTION

5

ABS warning light stays ON

DESCRIPTION

•

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

POSSIBLE

CAUSE

•

ABS HU/CM detects ABS system malfunction

•

ABS HU/CM detects low voltage in power supply (ABS HU/CM ignition terminal Z voltage is below
about 8 to 9 V)

•

Warning light circuit open or shorted to ground

STEP

INSPECTION

ACTION

1

INSPECT WIRING HARNESS BETWEEN ABS
HU/CM AND DLC-2 FOR CONTINUITY AND
SHORTS

•

Perform DTC inspection.

•

Is error message displayed regarding
communication between ABS HU/CM and
WDS or equivalent?

Yes

If the communication error message is displayed even after
inspecting according to procedures displayed on the WDS
or equivalent, go to Step 8.

No

Go to next step.

2

CHECK FOR DTCS IN ABS HU/CM

•

Have DTCs been recorded in memory?

Yes

Perform inspection using appropriate DTC.

No

Go to next step.

3

INSPECT PID/DATA IN ABS HU/CM

•

Inspect the following items using WDS or
equivalent.
— ABS_LAMP (ABS warning light)

•

Is ABS_LAMP ON after more than 4
seconds with ignition switch on?

Yes

Go to Step 8.

No

Go to next step.

4

VERIFY THAT ABS HU/CM CONNECTOR
TERMINAL W IS CONNECTED

•

Does malfunction symptom happen again
when ABS HU/CM connector terminal W is
shaken while the ignition switch is ON?

Yes

Connect ABS HU/CM connector terminal W securely, then
go to next step.

No

Go to Step 6.

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