Mazda CX 7. Manual — part 202
ON-BOARD DIAGNOSTIC
04-02–23
04-02
Diagnostic procedure
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.
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
04-02–24
End Of Sie
DTC C1279, C1280, C1281, C1282, C1951, C1952, C1959, C2768
id040200801700
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.
STEP
INSPECTION
ACTION
DTC
C1279, C1280, C1281, C1282, C1951,
C1952, C1959, C2768
Combined sensor system
DETECTION
CONDITION
• C1279
— The yaw rate value from the combined sensor (yaw rate part) exceeds specification while the vehicle
is stopped or while accelerating from a standstill.
• C1280
— The difference between the yaw rate value calculated by each sensor and the yaw rate value from
the combined sensor (yaw rate part) exceeds specification.
• C1281
— The difference between the lateral-G value calculated by each sensor and the lateral-G value from
the combined sensor (lateral-G part) exceeds specification.
• C1282
— Specified signal pattern from combined sensor has not output after the ignition switch is turned to the
ON position.
• C1951
— The monitor voltage from the combined sensor (lateral-G part) is not within specification.
• C1952
— The monitor voltage from the combined sensor (yaw rate part) is not within specification.
• C1959
— The lateral-G value from the combined sensor (lateral-G part) exceeds specification.
• C2768
— There is an abnormality in the signal from the combined sensor (yaw rate part).
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ON-BOARD DIAGNOSTIC
04-02–25
04-02
POSSIBLE
CAUSE
• Open circuit in the wiring harness between ignition switch and combined sensor terminal E or short
circuit to ground
• Open circuit in the wiring harness between DSC HU/CM terminal Y and combined sensor terminal F or
short circuit to ground
• Open circuit in the wiring harness between DSC HU/CM terminal AB and combined sensor terminal C
or short circuit to ground
• Open circuit in the wiring harness between DSC HU/CM terminal AE and combined sensor terminal A
or short circuit to ground
• Open circuit in the wiring harness between DSC HU/CM terminal AA and combined sensor terminal B
or short circuit to ground
• Open circuit in the wiring harness between DSC HU/CM terminal AI and combined sensor terminal D
• Combined sensor malfunction
• Poor connection at connectors (female terminal)
DSC HU/CM
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
E
F
C
A
D
B
Y
AB
AE
AI
AA
COMBINED SENSOR
IG 1
A
B
C
D
F
E
COMBINED SENSOR WIRING HARNESS-SIDE CONNECTOR
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ON-BOARD DIAGNOSTIC
04-02–26
Diagnostic procedure
STEP
INSPECTION
ACTION
1
INSPECT COMBINED SENSOR POWER
SUPPLY FOR OPEN CIRCUIT
• Turn the ignition switch to the ON position
(engine off).
• Measure voltage between combined sensor
terminal E (harness-side) and ground.
• Is the voltage B+?
Yes
Go to the next step.
No
Repair or replace the wiring harness for open circuit
between combined sensor terminal E and ignition switch,
then go to Step 12.
2
INSPECT COMBINED SENSOR GROUND
FOR OPEN CIRCUIT
• Turn the ignition switch off.
• Disconnect DSC HU/CM and combined
sensor connectors.
• Inspect for continuity between DSC HU/CM
terminal Y (harness-side) and combined
sensor terminal F (harness-side).
• Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for open circuit
between DSC HU/CM terminal Y and combined sensor
terminal F, then go to Step 12.
3
INSPECT COMBINED SENSOR (YAW RATE
PART) SIGNAL FOR OPEN CIRCUIT
• Inspect for continuity between DSC HU/CM
terminal AA (harness-side) and combined
sensor terminal B (harness-side).
• Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for open circuit
between DSC HU/CM terminal AA and combined sensor
terminal B, then go to Step 12.
4
INSPECT COMBINED SENSOR (YAW RATE
PART) SIGNAL FOR SHORT TO GROUND
• Turn the ignition switch off.
• Inspect for continuity between DSC HU/CM
terminal AA (harness-side) and ground.
• Is there continuity?
Yes
Repair or replace the wiring harness for short to ground
between DSC HU/CM terminal AA and combined sensor
terminal B, then go to Step 12.
No
Go to the next step.
5
INSPECT COMBINED SENSOR (LATERAL-G
PART) SIGNAL FOR OPEN CIRCUIT
• Inspect for continuity between DSC HU/CM
terminal AI (harness-side) and combined
sensor terminal D (harness-side).
• Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for open circuit
between DSC HU/CM terminal AI and combined sensor
terminal D, then go to Step 12.
6
INSPECT COMBINED SENSOR (LATERAL-G
PART) SIGNAL FOR SHORT TO GROUND
• Turn the ignition switch off.
• Inspect for continuity between DSC HU/CM
terminal AI (harness-side) and ground.
• Is there continuity?
Yes
Repair or replace the wiring harness for short to ground
between DSC HU/CM terminal AI and combined sensor
terminal D, then go to Step 12.
No
Go to the next step.
7
INSPECT REFERENCE SIGNAL FOR OPEN
CIRCUIT
• Turn the ignition switch off.
• Inspect for continuity between DSC HU/CM
terminal AE (harness-side) and combined
sensor terminal A (harness-side).
• Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for open circuit
between DSC HU/CM terminal AE and combined sensor
terminal A, then go to Step 12.
8
INSPECT REFERENCE SIGNAL FOR SHORT
TO GROUND
• Turn the ignition switch off.
• Inspect for continuity between DSC HU/CM
terminal AE (harness-side) and ground.
• Is there continuity?
Yes
Repair or replace the wiring harness for short to ground
between DSC HU/CM terminal AE and combined sensor
terminal A, then go to Step 12.
No
Go to the next step.
9
INSPECT TEST SIGNAL FOR OPEN CIRCUIT
• Turn the ignition switch off.
• Inspect for continuity between DSC HU/CM
terminal AB (harness-side) and combined
sensor terminal C (harness-side).
• Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for open circuit
between DSC HU/CM terminal AB and combined sensor
terminal C, then go to Step 12.
1871-1U-06B(04-02).fm 26 ページ 2006年3月15日 水曜日 午前11時12分
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