Mazda 6. Manual - part 248

P–48

ON-BOARD DIAGNOSTIC (ABS/TCS) 

PID/DATA Monitor Table

C1246

Right rear pressure reduction solenoid valve

(See 

P–63 DTC C1194, C1198, C1210, C1214, 

C1242, C1246, C1250, C1254

)

C1250

Left rear pressure retention solenoid valve

(See 

P–63 DTC C1194, C1198, C1210, C1214, 

C1242, C1246, C1250, C1254

)

C1254

Right rear ABS pressure retention solenoid valve

(See 

P–63 DTC C1194, C1198, C1210, C1214, 

C1242, C1246, C1250, C1254

)

C1266

Fail-safe relay

(See 

P–63 DTC C1194, C1198, C1210, C1214, 

C1242, C1246, C1250, C1254

 )

C1414

ABS (ABS/TCS) HU/CM

(See 

P–64 DTC C1414

 )

C1508

ABS/TCS HU/CM

(See 

P–64 DTC C1508

 )

C1510

Right front solenoid valve, motor or wheel-speed 
sensor/sensor rotor

(See 

P–64 DTC C1510, C1511, C1512, C1513

 )

C1511

Left front solenoid valve, motor or wheel-speed sensor/
sensor rotor

(See 

P–64 DTC C1510, C1511, C1512, C1513

 )

C1512

Right rear solenoid valve, motor or wheel-speed 
sensor/sensor rotor

(See 

P–64 DTC C1510, C1511, C1512, C1513

 )

C1513

Left rear solenoid valve, motor or wheel-speed sensor/
sensor rotor

(See 

P–64 DTC C1510, C1511, C1512, C1513

 )

U1900

Can communication

(See 

T–144 DTC U0073, U1900, U2516

 )

U2021

Invalid/fault data received

(See 

P–65 DTC U2021

 )

U2516

Can communication

(See 

T–144 DTC U0073, U1900, U2516

 )

PID Name

(Definition)

Unit/Condition

Condition/Specification

Action

 ABS (ABS/

TCS) HU/CM/

CM terminal

RPM
(Engine speed signal 
input)

RPM

• Engine is stopped: 0 RPM

• Engine is running: 

Indicates engine speed

Inspect PCM.

—

CCNTABS
(Number of continuous 
codes)

—

DTC is detected: 1—255

DTC is not detected: 0

Perform inspection using 
appropriate DTC.

—

PMPSTAT
(Pump motor output state)

ON/OFF

• Pump motor is activated: 

ON

• Pump motor is 

deactivated: OFF

Inspect ABS (ABS/TCS) 
HU/CM.
(See 

P–27 ABS (ABS/TCS) 

HU/CM SYSTEM 
INSPECTION

 )

—

BOO_ABS
(Brake pedal switch input)

ON/OFF

• Brake pedal is depressed: 

ON

• Brake pedal is released: 

OFF

Inspect brake switch.

Y

ABS_LAMP
(ABS warning light driver 
output state)

ON/OFF

• ABS warning light is 

illuminated: ON

• ABS warning light is not 

illuminated: OFF

Inspect ABS warning light.

—

BRAKE_LMP
(BRAKE system warning 
light output state)

ON/OFF

• BRAKE system warning 

light is illuminated: ON

• BRAKE system warning 

light is not illuminated: 
OFF

Inspect BRAKE system 
warning light.

—

ABSRR_O
(Right rear ABS pressure 
reduction solenoid valve 
output state)

ON/OFF

• During ABS control: ON/

OFF
(solenoid valve is 
activated/deactivated)

• Not ABS control: OFF

(solenoid valve is 
deactivated)

Internal fault of ABS (ABS/
TCS) HU/CM. Replace ABS 
(ABS/TCS) HU/CM.
(See 

P–28 ABS (ABS/TCS) 

HU/CM REMOVAL/
INSTALLATION

)

—

DTC

Diagnosis system component

Page

WDS or 

equiva-

lent

ON-BOARD DIAGNOSTIC (ABS/TCS) 

P–49

P

ABSLR_O
(Left rear ABS pressure 
reduction solenoid valve 
output state)

ON/OFF

• During ABS or EBD 

control: ON/OFF
(solenoid valve is 
activated/deactivated)

• Not ABS and EBD control: 

OFF
(solenoid valve is 
deactivated)

Internal fault of ABS (ABS/
TCS) HU/CM. Replace ABS 
(ABS/TCS) HU/CM.
(See 

P–28 ABS (ABS/TCS) 

HU/CM REMOVAL/
INSTALLATION

)

—

ABSRF_O
(Right front ABS pressure 
reduction solenoid valve 
output state)

ON/OFF

• During ABS control: ON/

OFF
(solenoid valve is 
activated/deactivated)

• Not ABS control: OFF

(solenoid valve is 
deactivated)

Internal fault of ABS (ABS/
TCS) HU/CM. Replace ABS 
(ABS/TCS) HU/CM.
(See 

P–28 ABS (ABS/TCS) 

HU/CM REMOVAL/
INSTALLATION

)

—

ABSLF_O
(Left front ABS pressure 
reduction solenoid valve 
output state)

ON/OFF

• During ABS control: ON/

OFF
(solenoid valve is 
activated/deactivated)

• Not ABS control: OFF

(solenoid valve is 
deactivated)

Internal fault of ABS (ABS/
TCS) HU/CM. Replace ABS 
(ABS/TCS) HU/CM.
(See 

P–28 ABS (ABS/TCS) 

HU/CM REMOVAL/
INSTALLATION

)

—

ABSRR_I
(Right rear ABS pressure 
reduction solenoid valve 
output state)

ON/OFF

• During ABS control: ON/

OFF
(solenoid valve is 
activated/deactivated)

• Not ABS control: OFF

(solenoid valve is 
deactivated)

Internal fault of ABS (ABS/
TCS) HU/CM. Replace ABS 
(ABS/TCS) HU/CM.
(See 

P–28 ABS (ABS/TCS) 

HU/CM REMOVAL/
INSTALLATION

)

—

ABSLR_I
(Left rear ABS pressure 
retention solenoid valve 
output state)

ON/OFF

• During ABS or EBD 

control: ON/OFF
(solenoid valve is 
activated/deactivated)

• Not ABS and EBD control: 

OFF
(solenoid valve is 
deactivated)

Internal fault of ABS (ABS/
TCS) HU/CM. Replace ABS 
(ABS/TCS) HU/CM.
(See 

P–28 ABS (ABS/TCS) 

HU/CM REMOVAL/
INSTALLATION

)

—

ABSRF_I
(Right front ABS pressure 
retention solenoid valve 
output state)

ON/OFF

• During ABS control: ON/

OFF
(solenoid valve is 
activated/deactivated)

• Not ABS control: OFF

(solenoid valve is 
deactivated)

Internal fault of ABS (ABS/
TCS) HU/CM. Replace ABS 
(ABS/TCS) HU/CM.
(See 

P–28 ABS (ABS/TCS) 

HU/CM REMOVAL/
INSTALLATION

)

—

ABSLF_I
(Left front ABS pressure 
retention solenoid valve 
output state)

ON/OFF

• During ABS control: ON/

OFF
(solenoid valve is 
activated/deactivated)

• Not ABS control: OFF

(solenoid valve is 
deactivated)

Internal fault of ABS (ABS/
TCS) HU/CM. Replace ABS 
(ABS/TCS) HU/CM.
(See 

P–28 ABS (ABS/TCS) 

HU/CM REMOVAL/
INSTALLATION

)

—

ABSVLVRLY
(Fail-safe relay output 
state)

ON/OFF

• Fail-safe relay is 

activated: ON

• Fail-safe relay is 

deactivated: OFF

Inspect ABS (ABS/TCS) 
HU/CM.
(See 

P–29 ABS (ABS/TCS) 

HU/CM INSPECTION

 )

—

ABSPMPRLY
(Motor relay output state)

ON/OFF

• Motor relay is activated: 

ON

• Motor relay is deactivated: 

OFF

Inspect ABS (ABS/TCS) 
HU/CM.
(See 

P–29 ABS (ABS/TCS) 

HU/CM INSPECTION

 )

—

LF_WSPD
(Left front wheel-speed 
sensor input)

KPH or MPH

• Vehicle is stopped: 0 KPH 

{0 MPH}

• Vehicle is driving: 

Indicates vehicle speed

Inspect wheel-speed 
sensor/sensor rotor.

E, I

PID Name

(Definition)

Unit/Condition

Condition/Specification

Action

 ABS (ABS/

TCS) HU/CM/

CM terminal

P–50

ON-BOARD DIAGNOSTIC (ABS/TCS) 

Acrive Command Mode

End Of Sie

DTC B1318

A6E697567650W03

Caution

• When attaching the tester lead to the ABS (ABS/TCS) HU/CM harness connector, the SST (49 G066 

001) must be used. (See 

P–29 ABS (ABS/TCS) HU/CM INSPECTION

.)

RF_WSPD
(Right front wheel-speed 
sensor input)

KPH or MPH

• Vehicle is stopped: 0 KPH 

{0 MPH}

• Vehicle is driving: 

Indicates vehicle speed

Inspect wheel-speed 
sensor/sensor rotor.

D, G

LR_WSPD
(Left rear wheel-speed 
sensor input)

KPH or MPH

• Vehicle is stopped: 0 KPH 

{0 MPH}

• Vehicle is driving: 

Indicates vehicle speed

Inspect wheel-speed 
sensor/sensor rotor.

C, F

RR_WSPD
(Right rear wheel-speed 
sensor input)

KPH or MPH

• Vehicle is stopped: 0 KPH 

{0 MPH}

• Vehicle is driving: 

Indicates vehicle speed

Inspect wheel-speed 
sensor/sensor rotor.

A, B

ABS_VOLT
(System battery voltage 
value)

V

• Ignition key at ON: B+

• Idle: Approx. 14—16 V

Inspect power supply circuit.
(See 

P–29 ABS (ABS/TCS) 

HU/CM INSPECTION

 )

Z

Command Name

Definition

Operation

Note

ABS_POWER

Fail-safe relay

ON/OFF

Ignition key at ON 
(Engine OFF), and 
driving

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

VS_OUTPUT

Vehicle speed signal output

SPEED

PID Name

(Definition)

Unit/Condition

Condition/Specification

Action

 ABS (ABS/

TCS) HU/CM/

CM terminal

DTC

B1318

ABS (ABS/TCS) 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 ABS (ABS/TCS) HU/CM terminal A

• Battery and/or generator malfunction

ON-BOARD DIAGNOSTIC (ABS/TCS) 

P–51

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 ABS (ABS/TCS) HU/CM POWER 
SUPPLY CIRCUIT FOR OPEN CIRCUIT

• Start engine.

• Measure voltage between ABS (ABS/TCS) 

HU/CM terminal Z and ground.

• Is voltage above 10 V?

Yes

Go to next step.

No

Go to Step 6.

5

INSPECT ABS (ABS/TCS) HU/CM GROUND 
CIRCUIT FOR POOR GROUND OR OPEN 
CIRCUIT

• Turn ignition key to OFF.

• Measure resistance between ground and 

DSC HU/CM terminal AC.

• 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 ABS 

(ABS/TCS) 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 ABS (ABS/TCS) 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.