Mazda 6. Manual — part 263

P–108

TROUBLESHOOTING (ABS/TCS/DYNAMIC STABILITY CONTROL)

NO.2 NEITHER ABS WARNING LIGHT NOR BRAKE SYSTEM WARNING LIGHT ILLUMINATE WITH
IGNITION SWITCH ON

A6E699067650W06

• When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors while

doing the inspection to discover whether poor contact points are the cause of any intermittent malfunction. If
there is a problem, check to make sure connectors, terminals and wiring harnesses are connected correctly
and undamaged.

End Of Sie

2

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

[TROUBLESHOOTING HINTS]

• Malfunction of instrument cluster or ABS/TCS HU/CM

• Improper configuration (instrument cluster)

STEP

INSPECTION

ACTION

1

VERIFY WHETHER MALFUNCTION IS IN
WARNING LIGHTS AND INDICATOR LIGHTS’
COMMON POWER SUPPLY, OR IN 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.

2

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.

*

3

VERIFY WHETHER MALFUNCTION IS IN
WIRING HARNESS (BETWEEN INSTRUMENT
CLUSTER POWER SUPPLY AND
INSTRUMENT CLUSTER FOR CONTINUITY)
OR INSTRUMENT CLUSTER

• Turn ignition switch ON.

• Measure voltage at instrument cluster

connector (24-pin ) terminal 2V.

• Is voltage approximately 12V?

Yes

Replace instrument cluster (open circuit in instrument
cluster).

No

Check for open circuit between instrment cluster and
ground.
Repair or replace as neccessary.

4

COMFIRM DTC U1900 USING WDS OR
EQUIVALENT

• Retrieve DTC from PCM, ABS/TCS and

instrument cluster.

• Is DTC U1900 retrieved?

Yes

Go to next step.

No

Inspect instrment cluster. If OK, then go to step6.

5

COMFIRM THE FOLLOWING PIDs USING
WDS OR EQUIVALENT:

• ABS_MSG

• PCM_MSG

• Is “not present” massage displayed on WDS

or equivalent?

Yes

Replace instrument cluster (open circuit in instrument
cluster).

No

Network communication, for related system is malfunction.
Repair or replace as neccessary.

6

COMFIRM DTC B2477 FOR INSTRUMENT
CLUSTER USING WDS OR EQUIVALENT

• Is DTC B2477 retrieved?

Yes

Re

-configure the

instrument cluster.

No

Replace ABS/TCS HU/CM.

TROUBLESHOOTING (ABS/TCS/DYNAMIC STABILITY CONTROL)

P–109

P

NO.3 ABS WARNING LIGHT DOES NOT ILLUMINATE WITH IGNITION SWITCH ON

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Diagnostic procedure

End Of Sie

NO.4 BRAKE SYSTEM WARNING LIGHT DOES NOT ILLUMINATE WITH IGNITION SWITCH ON

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End Of Sie

3

ABS warning light does not illuminate with ignition switch on.

[TROUBLESHOOTING HINTS]

• Malfunction of instrument cluster or ABS/TCS HU/CM

STEP

INSPECTION

ACTION

1

COMFIRM DTC U1900 USING WDS OR
EQUIVALENT

• Retrieve DTC from PCM, ABS/TCS and

instrument cluster.

• Is DTC U1900 retrieved?

Yes

Go to next step.

No

Inspect instrment cluster. If OK, then go to step6.

2

COMFIRM THE FOLLOWING PIDs USING
WDS OR EQUIVALENT:

• ABS_MSG

• PCM_MSG

• Is “not present” massage displayed on WDS

or equivalent?

Yes

Replace instrument cluster (open circuit in instrument
cluster).

No

Network communication, for related system is malfunction.
Repair or replace as neccessary.

4

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

[TROUBLESHOOTING HINTS]

• Malfunction of instrument cluster or ABS/TCS HU/CM

STEP

INSPECTION

ACTION

1

COMFIRM DTC U1900 USING WDS OR
EQUIVALENT

• Retrieve DTC from PCM, ABS/TCS and

instrument cluster.

• Is DTC U1900 retrieved?

Yes

Go to next step.

No

Inspect instrment cluster. If OK, then go to step6.

2

COMFIRM THE FOLLOWING PIDs USING
WDS OR EQUIVALENT:

• ABS_MSG

• PCM_MSG

• Is “not present” massage displayed on WDS

or equivalent?

Yes

Replace instrument cluster (open circuit in instrument
cluster).

No

Network communication, for related system is malfunction.
Repair or replace as neccessary.

P–110

TROUBLESHOOTING (ABS/TCS/DYNAMIC STABILITY CONTROL)

NO.5 TCS OFF LIGHT, TCS INDICATOR LIGHT DO NOT ILLUMINATE WITH IGNITION SWITCH ON

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Diagnostic procedure

5

TCS OFF light , TCS indicator light do not illuminate with ignition switch on.

[TROUBLESHOOTING HINTS]

• Malfunction of instrument cluster or ABS/TCS HU/CM

• Improper configuration (ABS/TCS HU/CM)

STEP

INSPECTION

ACTION

1

INSPECT WIRING HARNESS BETWEEN ABS/
TCS HU/CM AND DLC-2 (DATA LINK
CONNECTOR-2 ) FOR CONTINUITY AND
SHORTS
Activate TRAC_OFF (TCS OFF light) using
WDS or equivalent.
Is error message displayed regarding
communication between ABS/TCS 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 6.

No

Go to next step.

2

CHECK TCS OFF LIGHT BULB FOR
MALFUNCTIONS BY USING INSPECTION
FUNCTION IN ABS/TCS HU/CM
Activate TRAC_OFF (TCS OFF light) using
WDS or equivalent
Does TCS OFF light illuminate?

Yes

Go to next step.

No

Go to next step3.

3

COMFIRM DTC U1900 USING WDS OR
EQUIVALENT

• Retrieve DTC from PCM, ABS/TCS and

instrument cluster.

• Is DTC U1900 retrieved?

Yes

Go to next step.

No

Inspect instrment cluster. If OK, then go to step6.

4

COMFIRM THE FOLLOWING PIDs USING
WDS OR EQUIVALENT:

• ABS_MSG

• PCM_MSG

• Is “not present” massage displayed on WDS

or equivalent?

Yes

Replace instrument cluster (open circuit in instrument
cluster).

No

Network communication, for related system is malfunction.
Repair or replace as neccessary.

5

COMFIRM DTC B2477 FOR INSTRUMENT
CLUSTER USING WDS OR EQUIVALENT

• Is DTC B2477 retrieved?

Yes

Re

-configure the

instrument cluster.

No

Replace ABS/TCS HU/CM.

*

6

INSPECT WIRING HARNESS BETWEEN ABS/
TCS CM AND DLC-2 (DATA LINK
CONNECTOR-2) FOR CONTINUITY
Is there continuity between SST connector
terminal X and data link connector?

Yes

Go to next step.

No

Repair wiring harness between ABS/TCS HU/CM and data
link connector.

*

7

INSPECT WIRING HARNESS BETWEEN ABS/
TCS HU/CM AND DLC-2 (DATA LINK
CONNECTOR-2) FOR SHORT TO B+
Is voltage approximately 12 V at SST
connector terminal X?

Yes

Repair wiring harness between ABS/TCS HU/CM and data
link connector.

No

Go to next step.

8

INSPECT WIRING HARNESS BETWEEN ABS/
TCS HU/CM AND DLC-2 (DATA LINK
CONNECTOR-2) FOR SHORT TO GROUND
If there continuity between SST connector
terminal X and ground?

Yes

Repair wiring harness between ABS/TCS HU/CM and data
link connector.

No

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

TROUBLESHOOTING (ABS/TCS/DYNAMIC STABILITY CONTROL)

P–111

P

• When performing an asterisked (*) troubleshooting inspection, shake the wiring harness and connectors while

doing the inspection to discover whether poor contact points are the cause of any intermittent malfunction. If
there is a problem, check to make sure connectors, terminals and wiring harnesses are connected correctly
and undamaged.

End Of Sie

NO.6 BOTH ABS WARNING LIGHT AND BRAKE SYSTEM WARNING LIGHT STAY ON MORE THAN 4
SECONDS WITH IGNITION SWITCH ON

A6E699067650W10

Diagnostic procedure

STEP

INSPECTION

ACTION

6

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

[TROUBLESHOOTING HINTS]

• ABS/TCS HU/CM detects ABS proportioning system malfunction.

• ABS/TCS HU/CM detects low voltage in power supply (ABS/TCS CM ingestion terminal Z voltage is below about 9

to 10 V).

• ABS/TCS HU/CM does not operate.

• Malfunction of communication network.

STEP

INSPECTION

ACTION

1

INSPECT ABS/TCS HU/CM POWER SUPPLY
FUSE
Is ABS/TCS HU/CM ignition power supply fuse
okay?

Yes

Go to next step.
Check for a short to ground on blown fuse’s circuit.

No

Repair or replace as necessary.
Install appropriate amperage fuse.

2

INSPECT WIRING HARNESS BETWEEN ABS/
TCS HU/CM AND DLC-2 (DATA LINK
CONNECTOR-2) FOR CONTINUITY AND
SHORTS
Perform DTC inspection.
Is error message displayed regarding
communication between ABS/TCS HU/CM and
WDS or equivalent?

Yes

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

No

Go to next step.

3

CHECK FOR DTCS IN ABS/TCS HU/CM
Have DTCs been recorded in memory?

Yes

Perform inspection using appropriate DTC.

No

Go to next step.