Mazda 6. Manual — part 254

P–72

ON-BOARD DIAGNOSTIC (DYNAMIC STABILITY CONTROL)

Active Command Modes Table

End Of Sie

DTC B1318

A6E697367650W03

Caution

• When attaching the tester lead to the DSC HU/CM connector the SST (49 G066 004) must be used.

Command Name

Definition

Operation

Note

RF_DSC_V

Stability control solenoid valve (RF-LR)

ON/OFF

Ignition key at ON
(Engine OFF), and
driving

LF_DSC_V

Stability control solenoid valve (LF-RR)

ON/OFF

ABS_POWER

Fail-safe relay

ON/OFF

LR_OUTLET

Left rear ABS pressure reduction solenoid valve

ON/OFF

LR_INLET

Left rear ABS pressure retention solenoid valve

ON/OFF

RR_INLET

Right rear ABS pressure retention solenoid valve

ON/OFF

RR_OUTLET

Right rear ABS pressure reduction solenoid valve

ON/OFF

LF_INLET

Left front ABS pressure retention solenoid valve

ON/OFF

LF_OUTLET

Left front ABS pressure reduction solenoid valve

ON/OFF

RF_INLET

Right front ABS pressure retention solenoid valve

ON/OFF

RF_OUTLET

Right front ABS pressure reduction solenoid valve

ON/OFF

PMP_MOTOR

ABS motor

ON/OFF

RF_TC_VLV

Traction switch solenoid valve (RF-LR)

ON/OFF

LF_TC_VLV

Traction switch solenoid valve (LF-RR)

ON/OFF

TRAC OFF

Traction control off indicator

ON/OFF

STAB_IND

DSC indicator light

ON/OFF

YAWRATE

Yaw rate sensor initialization start

ON/OFF

LATACCEL

Lateral accel sensor initialization start

TRUE/FALSE

DTC

B1318

DSC power supply

DETECTION

CONDITION

• Low voltage is detected at the voltage monitor of solenoid valve monitor, or the motor monitor.

POSSIBLE

CAUSE

• Malfunction of fuse (SUS 15 A)

• Open or short to power circuit in harness between DSC HU/CM terminal G and battery positive terminal

• Open circuit in harness between body ground and DSC HU/CM terminal A

• Battery and/or generator malfunction

ON-BOARD DIAGNOSTIC (DYNAMIC STABILITY CONTROL)

P–73

P

Diagnostic procedure

STEP

INSPECTION

ACTION

1

INSPECT BATTERY VOLTAGE

• Is battery terminal voltage okay?

Yes

Make sure that battery terminal connection is okay.
Go to next step.

No

Charge or replace battery, then go to Step 6.

2

INSPECT BATTERY GRAVITY

• Is battery specific gravity as specified?

Yes

Go to next step.

No

Replace battery, then go to Step 6.

3

INSPECT CHARGING SYSTEM

• Are generator and drive belt tension okay?

Yes

Go to next step.

No

Adjust drive belt tension as necessary.
Replace generator and/or drive belt as necessary.

4

INSPECT DSC HU/CM POWER SUPPLY
CIRCUIT FOR OPEN CIRCUIT

• Start engine.

• Measure voltage between DSC HU/CM

terminal G and ground.

• Is voltage above 10 V?

Yes

Go to next step.

No

Go to Step 6.

5

INSPECT DSC HU/CM GROUND CIRCUIT
FOR POOR GROUND OR OPEN CIRCUIT

• Turn ignition key to OFF.

• Measure resistance between ground and

DSC HU/CM terminal A.

• Is resistance within 0—1 ohm?

Yes

Go to next step.

No

If there is no continuity:

• Repair or replace harness for open circuit between DSC

HU/CM and ground, then go to next step.

If resistance is not within 0—1 ohm:

• Repair or replace harness for poor ground, then go to

next step.

6

VERIFY TROUBLESHOOTING COMPLETED

• Make sure to reconnect all disconnected

connectors.

• Clear DTC from memory.

(See

P–46 Clearing DTCs Procedures

)

• Is same DTC present?

Yes

Replace DSC HU/CM, then go to next step.

No

Go to next step.

7

VERIFY AFTER REPAIR PROCEDURE

• Is there any other DTC present?

Yes

Go to applicable DTC inspection.

No

Troubleshooting completed.

P–74

ON-BOARD DIAGNOSTIC (DYNAMIC STABILITY CONTROL)

End Of Sie

DTC B1342

A6E697367650W04

Caution

• When attaching the tester lead to the DSC HU/CM connector the SST (49 G066 004) must be used.

Diagnostic procedure

End Of Sie

DTC B1483, B1484, B1486

A6E697367650W05

Caution

• When attaching the tester lead to the DSC HU/CM connector the SST (49 G066 004) must be used.

DTC

B1342

DSC HU/CM

DETECTION

CONDITION

The on-board diagnostic function detects control module malfunction.

POSSIBLE

CAUSE

• Malfunction of DSC HU/CM

STEP

INSPECTION

ACTION

1

VERIFY CURRENT STATUS OF
MALFUNCTION

• Clear DTC from memory.

(See

P–46 Clearing DTCs Procedures

)

• Start engine and drive vehicle at 10 km/h

{6.2 mph} or above.

• Is same DTC present?

Yes

Replace DSC HU/CM, then go to next step.

No

Inspect intermittent concern using the same procedure as
engine control system.

2

VERIFY AFTER REPAIR PROCEDURE

• Is there any other DTC present?

Yes

Go to applicable DTC inspection.

No

Troubleshooting completed.

DTC

B1483, B1484, B1486

Brake switch signal

DETECTION

CONDITION

• Low voltage is detected at the voltage monitor of solenoid valve monitor, or the motor monitor

POSSIBLE

CAUSE

• B1483

— Malfunction of brake switch

• B1484

— Open circuit in harness between DSC HU/CM terminal I and brake switch

• B1486

— Short to ground circuit in harness between DSC HU/CM terminal I and brake switch

• Short to power circuit in harness between DSC HU/CM terminal I and brake switch

ON-BOARD DIAGNOSTIC (DYNAMIC STABILITY CONTROL)

P–75

P

Diagnostic procedure

End Of Sie

STEP

INSPECTION

ACTION

1

INSPECT DSC HU/CM TO BRAKE SWITCH
FOR OPEN CIRCUIT

• Turn ignition key to OFF.

• Disconnect DSC HU/CM and brake switch

connector

• Inspect continuity DSC HU/CM terminal L

and brake switch

• Is there continuity?

Yes

Go to next step.

No

Repair or replace harness for open circuit between DSC
HU/CM and brake switch, then go to next step.

2

INSPECT DSC HU/CM TO BRAKE SWITCH
FOR SHORT TO GROUND

• Turn ignition key to OFF.

• Inspect continuity DSC HU/CM terminal L

and ground

• Is there continuity?

Yes

Repair or replace harness for open circuit between DSC
HU/CM and brake switch, then go to next step.

No

Go to next step.

3

INSPECT BRAKE SWITCH

• Inspect bake switch.

• Is it okay?

Yes

Go to next step.

No

Replace bake switch, then go to next step.

4

VERIFY TROUBLESHOOTING COMPLETED

• Make sure to reconnect all disconnected

connectors.

• Clear DTC from memory.

(See

P–46 Clearing DTCs Procedures

)

• Is same DTC present?

Yes

Replace bake switch, then go to next step.

No

Go to next step.

5

VERIFY AFTER REPAIR PROCEDURE

• Is there any other DTC present?

Yes

Go to applicable DTC inspection.

No

Troubleshooting completed.