Mazda 6. Manual - part 262

P–104

TROUBLESHOOTING (ABS/TCS/DYNAMIC STABILITY CONTROL) 

SYMPTOM TROUBLESHOOTING

A6E699067650W04

• Verify the symptoms, and perform troubleshooting according to the appropriate number.

Vehicles with ABS/TCS

Vehicles with DSC

*1

:  DSC system contains traction control function, DSC indicator light goes on and off while DSC operates.

*2

:  DSC indicator light goes on and off while DSC operates.

No.

Symptom

1

ABS warning light, BRAKE system warning light, TCS OFF light do not illuminate with ignition switch on.

2

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

3

ABS warning light does not illuminate with ignition switch on.

4

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

5

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

6

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

7

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

8

BRAKE system warning light stays on more than 4 seconds with ignition switch on. (Parking brake is released.)

9

TCS OFF light stays on more than 4 seconds with ignition switch on.

10

TCS does not work correctly.

11

There is a malfunction in the system even through ABS warning light, BRAKE system warning light, TCS OFF 
light,TCS indicator light do not illuminate.

No.

Symptom

1

Any of the following lights do not illuminate with ignition switch on.

• ABS warning light

• BRAKE system warning light

• DSC indicator light

• DSC OFF light

2

Any of the following lights stay on:

• ABS warning light.

• BRAKE system warning light

• DSC indicator light

• DSC OFF light

3

There is a malfunction in the system even though ABS warning light, BRAKE system warning light, DSC indicator light 
and DSC OFF light do not illuminate.

4

ABS or TCS

*1

 operates frequently.

TCS does not work correctly.

5

DSC

*2

 operates frequently.

DSC does not work correctly.

6

DSC indicator light flashes (when neither the TCS nor the DSC are operating).

TROUBLESHOOTING (ABS/TCS/DYNAMIC STABILITY CONTROL) 

P–105

P

Vehicle with ABS/TCS

A6E6980W002

P–106

TROUBLESHOOTING (ABS/TCS/DYNAMIC STABILITY CONTROL) 

Vehicle with DSC

End Of Sie

A6E6980W100

TROUBLESHOOTING (ABS/TCS/DYNAMIC STABILITY CONTROL) 

P–107

P

NO.1 ABS WARNING LIGHT, BRAKE SYSTEM WARNING LIGHT, TCS OFF LIGHT DO NOT ILLUMINATE 
WITH IGNITION SWITCH ON

A6E699067650W05

Vehicle with ABS/TCS

• 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

1

ABS warning light, BRAKE system warning light, TCS OFF light do not 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.