Mazda 6. Manual - part 249

P–52

ON-BOARD DIAGNOSTIC (ABS/TCS) 

End Of Sie

DTC B1342

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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

.)

Diagnostic procedure

End Of Sie

DTC C1095, C1096

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Caution

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

G066 001) must be used. (See 

P–29 ABS (ABS/TCS) HU/CM INSPECTION

.)

DTC

B1342

ABS (ABS/TCS) HU/CM

DETECTION 

CONDITION

The on-board diagnostic function detects control module malfunction.

POSSIBLE 

CAUSE

• Malfunction of ABS (ABS/TCS) 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 ABS (ABS/TCS) 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

C1095, C1096

Motor relay, pump motor

DETECTION 

CONDITION

• C1095:

— ABS motor stuck OFF when vehicle is started or during ABS operation, ABS motor ON is 

commanded.

• C1096: 

— ABS motor stuck OFF when vehicle is started or during ABS operation, ABS motor ON is 

commanded.

— Motor monitor ON signal is not input after specified time when the motor signal is switched from ON 

to OFF by ABS (ABS/TCS) HU/CM.

POSSIBLE 

CAUSE

• Open, or short to power or short to ground of motor relay and/or ABS motor in ABS (ABS/TCS) HU/CM

• Stuck motor relay and/or ABS motor

• Open circuit of ABS motor power supply

• Open circuit of ABS motor ground

ON-BOARD DIAGNOSTIC (ABS/TCS) 

P–53

P

Diagnostic procedure

STEP

INSPECTION

ACTION

1

VERIFY OTHER DTC HAS BEEN RECORDED

• If any of DTC C1186 and/or C1266 has also 

been stored?

Yes

Go to applicable DTC inspection.

No

Go to next step.

2

INSPECT ABS FUSE CONDITION

• Is ABS fuse (60 A) okay?

Yes

Go to next step.

No

Replace fuse, then go to Step 6.

3

INSPECT MOTOR RELAY POWER SUPPLY 
CIRCUIT FOR OPEN CIRCUIT

• Turn ignition key to OFF.

• Disconnect ABS (ABS/TCS) HU/CM 

connector.

• Connect SST (adapter harness) to ABS 

(ABS/TCS) HU/CM connector (harness side 
only).

• Turn ignition key to ON (engine OFF).

• Measure voltage between ABS (ABS/TCS) 

HU/CM terminal AB (harness side) of SST 
and ground.

• Is voltage B+?

Yes

Go to next step.

No

Repair or replace harness for open circuit between battery 
positive terminal and ABS (ABS/TCS) HU/CM terminal AC, 
then go to Step 6.

4

INSPECT PUMP MOTOR GROUND CIRCUIT 
FOR OPEN CIRCUIT

• Turn ignition key to OFF.

• Inspect continuity between ABS (ABS/TCS) 

HU/CM terminal AD (harness side) of SST 
and ground.

• Is there continuity?

Yes

Go to next step.

No

Repair or replace harness for open circuit between ABS 
(ABS/TCS) HU/CM terminal AB and ground, then go to Step 
6.

P–54

ON-BOARD DIAGNOSTIC (ABS/TCS) 

End Of Sie

DTC C1119

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5

VERIFY PUMP MOTOR OPERATION

• Turn ignition key to OFF.

• Remove SST (adapter harness) and connect 

all disconnected connectors.

• Connect WDS or equivalent to DLC-2.

• Turn ignition key to ON (engine OFF).

• Access ABS_POWER and PMP_MOTOR 

active command modes using WDS or 
equivalent.

• Does pump motor operate?

Yes

Go to next step.

No

Repair ABS (ABS/TCS) HU/CM, then go to next step.

6

VERIFY TROUBLESHOOTING COMPLETED

• Clear DTC from memory.

(See 

P–46 Clearing DTCs Procedures

)

• Start engine and drive vehicle at 10 km/h 

{6.2 mph} or above.

• Gradually slow down and stop vehicle.

• 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.

STEP

INSPECTION

ACTION

DTC

C1119

Engine control system, torque reduction inhibit signal line

DETECTION 

CONDITION

• Engine RPM information through CAN is out of specification or invalid value

• Throttle information through CAN is out of specification or invalid value

POSSIBLE 

CAUSE

• Malfunction of PCM

ON-BOARD DIAGNOSTIC (ABS/TCS) 

P–55

P

Diagnostic procedure

End Of Sie

DTC C1140

A6E697567650W09

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

.)

Diagnostic procedure

STEP

INSPECTION

ACTION

1

CHECK FOR CAN FOR DTCs

• If any of DTC U1900 and/or U2516 has also 

been stored?

Yes

Follow inspection procedures for CAN system.
See 

T–144 DTC U0073, U1900, U2516

No

Go to next step.

2

CHECK FOR PCM FOR DTCs

• Turn ignition key to OFF.

• Connect WDS or equivalent to DLC-2

• Turn ignition key to ON (engine OFF).

• Is DTC for engine control system obtained?

Yes

Follow inspection procedures for engine control system.

No

Go to next step.

3

VERIFY TROUBLESHOOTING COMPLETED

• Make sure to reconnect all disconnected 

connectors.

• Clear DTC from memory.

(See 

P–46 Clearing DTCs Procedures

• Start engine.)

• Is same DTC present?

Yes

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

No

Go to next step.

4

VERIFY AFTER REPAIR PROCEDURE

• Is there any other DTC present?

Yes

Go to applicable DTC inspection.

No

Troubleshooting completed.

DTC

C1140

ABS (ABS/TCS) HU/CM (pump)

DETECTION 

CONDITION

Right front and left rear wheels, or left front and right rear wheel-lock is detected during ABS (ABS/TCS) 
operation.

POSSIBLE 

CAUSE

Stuck pump motor in ABS (ABS/TCS) HU/CM

STEP

INSPECTION

ACTION

1

INSPECT ABS (ABS/TCS) HU/CM 
OPERATION

• Perform ABS (ABS/TCS) HU/CM system 

inspection.
(See 

P–27 ABS (ABS/TCS) HU/CM 

SYSTEM INSPECTION

)

• Is it okay?

Yes

Go to next step.

No

Replace ABS (ABS/TCS) HU/CM, then go to Step 4.

2

INSPECT CONVENTIONAL BRAKE 
OPERATION

• Inspect brake fluid level.

• Start engine.

• Perform a road test to verify conventional 

vehicle braking performance.

• Is there any concern.

Yes

Inspect conventional brake line, then go to Step 4.

No

Go to next step.

3

INSPECT REAR BRAKE DRAGGING

• Turn ignition key to OFF.

• Jack-up vehicle and support it with safety 

stand.

• Release parking brake.

• Turn rear wheel by hand and inspect for rear 

brake drag.

• Is rear brake dragging?

Yes

Repair parking brake system, then go to next step.

No

Go to next step.

4

VERIFY TROUBLESHOOTING COMPLETED

• Clear DTC from memory.

(See 

P–46 Clearing DTCs Procedures

)

• Start engine and drive vehicle at 10 km/h 

{6.2 mph} or above at least one minute.

• Gradually slow down vehicle and stop.

• Is same DTC present?

Yes

Replace ABS (ABS/TCS) HU/CM, 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.