Mazda CX 7. Manual — part 200

ON-BOARD DIAGNOSTIC

04-02–15

04-02

DTC C1145, C1155, C1165, C1175

id040200801100

DTC

C1145
C1155
C1165
C1175

RF ABS wheel-speed sensor (open circuit) system
LF ABS wheel-speed sensor (open circuit) system
RR ABS wheel-speed sensor (open circuit) system
LR ABS wheel-speed sensor (open circuit) system

DETECTION

CONDITION

• Open circuit has been detected in the ABS wheel-speed sensor or the ABS wheel-speed sensor wiring

harness on any of the four vehicle wheels.

POSSIBLE

CAUSE

• Open circuit in the wiring harness between the following DSC HU/CM terminal and the ABS wheel-

speed sensor terminal:
— DSC HU/CM terminal M— RF ABS wheel-speed sensor terminal A

— DSC HU/CM terminal O— RF ABS wheel-speed sensor terminal B

— DSC HU/CM terminal F— LF ABS wheel-speed sensor terminal A

— DSC HU/CM terminal E— LF ABS wheel-speed sensor terminal B

— DSC HU/CM terminal I— RR ABS wheel-speed sensor terminal A

— DSC HU/CM terminal L— RR ABS wheel-speed sensor terminal B

— DSC HU/CM terminal G— LR ABS wheel-speed sensor terminal A

— DSC HU/CM terminal H— LR ABS wheel-speed sensor terminal B

• ABS wheel-speed sensor malfunction

• Poor connection at connectors (female terminal)

A
B

B

A

A

B

G

M
O

H

F
E

L

I

B

A

RF
ABS WHEEL-SPEED
SENSOR

LF
ABS WHEEL-SPEED
SENSOR

RR
ABS WHEEL-SPEED
SENSOR

LR
ABS WHEEL-SPEED
SENSOR

DSC HU/CM

A

B

A

B

ABS WHEEL-SPEED SENSOR WIRING HARNESS-SIDE CONNECTOR

FRONT

REAR

A

B

C

D

F

I

L

O

R

U

X

E

H

Q

T

W

Z

G

J

M

P

S

V

Y

K

N

AA

AB

AC

AD

AE

AF

AG

AH

AI

AJ

AK

AL

AM

AN

AO

AP

AQ

AR

AS

AT

DSC HU/CM WIRING HARNESS-SIDE CONNECTOR

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ON-BOARD DIAGNOSTIC

04-02–16

Diagnostic procedure

End Of Sie

STEP

INSPECTION

ACTION

1

INSPECT PID TO VERIFY THAT WHEEL
SPEED-SIGNALS ARE TRANSMITTED FROM
ABS WHEEL- SPEED SENSOR USING M-
MDS

• Turn the ignition switch off.

• Connect the M-MDS to the DLC-2.

• Select the following PIDs using the M-MDS:

WSPD_LF
WSPD_LR
WSPD_RF
WSPD_RR

• Drive the vehicle.

• Verify that the wheel speed-signals are

transmitted from each ABS wheel-speed
sensor.

• Are the wheel-speed signals transmitted?

Yes

Go to Step 3.

No

Go to the next step.

2

INSPECT FOR OPEN CIRCUIT IN WIRING
HARNESS BETWEEN DSC HU/CM AND ABS
WHEEL-SPEED SENSOR

• Turn the ignition switch off.

• Disconnect the DSC HU/CM connector and

ABS wheel-speed sensor.

• Inspect for continuity in the wiring harness

between the following ABS wheel-speed
sensor connectors on the vehicle wiring
harness-side and DSC HU/CM connectors.
— RF ABS wheel-speed sensor: M— A

— RF ABS wheel-speed sensor: O— B

— LF ABS wheel-speed sensor: F— A

— LF ABS wheel-speed sensor: E— B

— RR ABS wheel-speed sensor: I— A

— RR ABS wheel-speed sensor: L— B

— LR ABS wheel-speed sensor: G— A

— LR ABS wheel-speed sensor: H— B

• Is there continuity?

Yes

Replace the ABS wheel-speed sensor, then go to the next
step.
(See 04-15-11 FRONT ABS WHEEL-SPEED SENSOR
REMOVAL/INSTALLATION.)
(See 04-15-13 REAR ABS WHEEL-SPEED SENSOR
REMOVAL/INSTALLATION[2WD].)
(See 04-15-13 REAR ABS WHEEL-SPEED SENSOR
REMOVAL/INSTALLATION[AWD].)

No

Repair or replace the wiring harness, then go to the next
step.

3

VERIFY THAT THE SAME DTC IS NOT
PRESENT

• Clear the DTCs from the memory.

(See 04-02-3 ON-BOARD DIAGNOSIS.)

• Start the engine and drive the vehicle at 10

km/h {6.2 mph} or more.

• Are the same DTCs present?

Yes

Repeat the inspection from Step 1.
If the malfunction recurs, replace the DSC HU/CM, then go
to the next step.
(See 04-15-6 DSC HU/CM REMOVAL/INSTALLATION.)

No

Go to the next step.

4

VERIFY THAT NO OTHER DTCS ARE
PRESENT

• Are any other DTCs output?

Yes

Go to the applicable DTC inspection.
(See 04-02-3 ON-BOARD DIAGNOSIS.)

No

DTC troubleshooting completed.

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ON-BOARD DIAGNOSTIC

04-02–17

04-02

DTC C1148, C1158, C1168, C1178

id040200801200

DTC

C1148
C1158
C1168
C1178

RF ABS wheel-speed sensor/ABS sensor rotor system
LF ABS wheel-speed sensor/ABS sensor rotor system
RR ABS wheel-speed sensor/ABS sensor rotor system
LR ABS wheel-speed sensor/ABS sensor rotor system

DETECTION

CONDITION

• Vehicle wheel speed signals of any of the four vehicle wheels indicate abnormal acceleration that

exceeds specification.

• Vehicle wheel speed signals of any of the four vehicle wheels indicate speed that exceeds specification.

POSSIBLE

CAUSE

• ABS wheel-speed sensor malfunction (low output, metal shavings on sensor)

• ABS sensor rotor malfunction (chipping of sensor rotor teeth)

• Poor installation of ABS wheel-speed sensor and/or sensor rotor

• Excessive clearance between the ABS wheel-speed sensor and sensor rotor

A
B

B

A

A

B

G

M
O

H

F
E

L

I

B

A

RF
ABS WHEEL-SPEED
SENSOR

LF
ABS WHEEL-SPEED
SENSOR

RR
ABS WHEEL-SPEED
SENSOR

LR
ABS WHEEL-SPEED
SENSOR

DSC HU/CM

A

B

A

B

ABS WHEEL-SPEED SENSOR WIRING HARNESS-SIDE CONNECTOR

FRONT

REAR

A

B

C

D

F

I

L

O

R

U

X

E

H

Q

T

W

Z

G

J

M

P

S

V

Y

K

N

AA

AB

AC

AD

AE

AF

AG

AH

AI

AJ

AK

AL

AM

AN

AO

AP

AQ

AR

AS

AT

DSC HU/CM WIRING HARNESS-SIDE CONNECTOR

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ON-BOARD DIAGNOSTIC

04-02–18

Diagnostic procedure

End Of Sie

STEP

INSPECTION

ACTION

1

INSPECT PID FOR ABNORMAL OUTPUT
FROM ABS WHEEL-SPEED SENSOR USING
M-MDS

• Turn the ignition switch off.

• Connect the M-MDS to the DLC-2.

• Select the following PIDs using the M-MDS:

WSPD_LF
WSPD_LR
WSPD_RF
WSPD_RR

• Start the engine and drive the vehicle.

• Verify that the PIDs of the four ABS wheel-

speed sensors correspond approximately.

• Do the vehicle speeds correspond?

Yes

Go to Step 4.

No

If there is a difference in speeds of the four wheels, go to the
next step.

2

INSPECT IF MALFUNCTION OCCURRED
DUE TO IMPROPER SENSOR CLEARANCE.

• Inspect the clearance between the ABS

wheel-speed sensor and the ABS sensor
rotor.
(See 04-15-12 FRONT ABS WHEEL-
SPEED SENSOR INSPECTION.)
(See 04-15-14 REAR ABS WHEEL-SPEED
SENSOR INSPECTION[2WD].)
(See 04-15-14 REAR ABS WHEEL-SPEED
SENSOR INSPECTION[AWD].)

• Is the clearance normal?

Clearance

Front: 0.7— 1.5 mm {0.028— 0.059 in}
Rear: 0.3— 1.1 mm {0.012— 0.043 in}

Yes

Go to the next step.

No

Replace the ABS wheel-speed sensor, then go to Step 4.
(See 04-15-11 FRONT ABS WHEEL-SPEED SENSOR
REMOVAL/INSTALLATION.)
(See 04-15-13 REAR ABS WHEEL-SPEED SENSOR
REMOVAL/INSTALLATION[2WD].)
(See 04-15-13 REAR ABS WHEEL-SPEED SENSOR
REMOVAL/INSTALLATION[AWD].)

3

VISUALLY INSPECT ABS SENSOR ROTOR
FOR FOREIGN MATERIAL ADHERING OR
IMPROPER INSTALLATION

• Is the result normal?

Yes

Go to the next step.

No

Replace the front drive shaft, rear wheel hub component
(2WD) or rear drive shaft (AWD), then go to the next step.
(See 03-13-12 FRONT DRIVE SHAFT REMOVAL/
INSTALLATION.)
(See 03-12-3 WHEEL HUB COMPONENT REMOVAL/
INSTALLATION[2WD].)
(See 03-13-20 REAR DRIVE SHAFT REMOVAL/
INSTALLATION.)

4

VERIFY THAT THE SAME DTC IS NOT
PRESENT

• Clear the DTC from the memory.

(See 04-02-3 ON-BOARD DIAGNOSIS.)

• Start the engine and drive the vehicle at 10

km/h {6.2 mph} or more.

• Are the same DTCs present?

Yes

Repeat the inspection from Step 1.
If the malfunction recurs, replace the DSC HU/CM, then go
to the next step.
(See 04-15-6 DSC HU/CM REMOVAL/INSTALLATION.)

No

Go to the next step.

5

VERIFY THAT NO OTHER DTCS ARE
PRESENT

• Are any other DTCs output?

Yes

Go to the applicable DTC inspection.
(See 04-02-3 ON-BOARD DIAGNOSIS.)

No

DTC troubleshooting completed.

1871-1U-06B(04-02).fm 18 ページ ２００６年３月１５日 水曜日 午前１１時１２分