Mazda CX 7. Manual — part 203
ON-BOARD DIAGNOSTIC
04-02–27
04-02
End Of Sie
DTC C1288, C1290, C1953
id040200801800
Diagnostic procedure
End Of Sie
10
INSPECT TEST SIGNAL FOR SHORT TO
GROUND
• Turn the ignition switch off.
• Inspect for continuity between DSC HU/CM
terminal AB (harness-side) and ground.
• Is there continuity?
Yes
Repair or replace the wiring harness for short to ground
between DSC HU/CM terminal AB and combined sensor
terminal C, then go to Step 12.
No
Go to the next step.
11
INSPECT COMBINED SENSOR
• Inspect the combined sensor.
(See 04-15-16 COMBINED SENSOR
INSPECTION.)
• Is the combined sensor normal?
Yes
Go to the next step.
No
Replace the combined sensor, then go to the next step.
(See 04-15-15 COMBINED SENSOR REMOVAL/
INSTALLATION.)
12
VERIFY DTC TROUBLESHOOTING
COMPLETED.
• Clear the DTC from the memory.
(See 04-02-3 ON-BOARD DIAGNOSIS.)
• Are the same DTCs present?
Yes
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.
13
VERIFY AFTER REPAIR PROCEDURE.
• Are any other DTCs present?
Yes
Go to the applicable DTC inspection.
(See 04-02-3 ON-BOARD DIAGNOSIS.)
No
DTC troubleshooting completed.
STEP
INSPECTION
ACTION
DTC
C1288, C1290, C1953
Brake fluid pressure sensor system
DETECTION
CONDITION
• C1288
— The pressure from the brake fluid pressure sensor when the system starts up is not within
specification.
• C1290
— The standard brake fluid pressure calculated in the DSC HU/CM when not braking exceeds the
specification.
• C1953
— The output voltage from the brake fluid pressure sensor is not within specification.
POSSIBLE
CAUSE
• Open or short circuit in the brake fluid pressure sensor circuit in the DSC HU/CM
• Malfunction in the brake fluid pressure sensor
STEP
INSPECTION
ACTION
1
VERIFY NO ABNORMALITY ON BRAKE
FLUID PRESSURE SENSOR
• 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
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.
2
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
04-02–28
DTC C1295, C1307, C1937, C1938
id040200805000
Diagnostic procedure
End Of Sie
DTC
C1295, C1307, C1937, C1938
Steering angle sensor system
DETECTION
CONDITION
• C1295
— The steering angle sensor detects an internal abnormality.
• C1307
— The steering angle sensor detects an abnormality in the signal.
• C1937
— The difference between the steering angle calculated by each sensor and the steering angle from
the steering angle sensor exceeds specification.
• C1938
— The difference between the steering angle previously received and the steering angle received at
this time is not within specification.
— The signal from the steering angle sensor remains unchanged when the steering angle is turned to
the right and left.
POSSIBLE
CAUSE
• Improper installation or positioning of the steering angle sensor
• Steering angle sensor malfunction
• Poor connection at connectors (female terminal)
STEP
INSPECTION
ACTION
1
INSPECT FOR BCM MALFUNCTION
• Turn the ignition switch off.
• Using the M-MDS, perform the DTC
inspection for the BCM.
• Are any DTCs detected?
Yes
Go to applicable DTC inspection.
(See 09-02F-2 DTC TABLE[BCM].)
No
Go to the next step.
2
VERIFY DTC TROUBLESHOOTING
COMPLETED
• Clear the DTC from the memory.
(See 04-02-3 ON-BOARD DIAGNOSIS.)
• Are the same DTCs present?
Yes
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.
3
VERIFY AFTER REPAIR PROCEDURE
• Are any other DTCs present?
Yes
Go to the applicable DTC inspection.
(See 04-02-3 ON-BOARD DIAGNOSIS.)
No
DTC troubleshooting completed.
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
W
X
STEERING
ANGLE
SENSOR
ROOM
CAN_H
CAN_L
BCM
CAN
DRIVER
CAN
DRIVER
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ON-BOARD DIAGNOSTIC
04-02–29
04-02
DTC C1306
id040200802000
Note
• The steering angle initialization value of the BCM is stored using the battery power supply. Therefore, the
battery power supply of the BCM is cut and the stored steering angle initialization value is cleared when
any of the following items are performed. DTC C1306 is stored in the memory.
— Negative battery cable disconnection
— BCM connector disconnection
— Fuse (ROOM) removal
— Wiring harness disconnection between battery and steering angle sensor connector
— Wiring harness disconnection between battery, BCM connector, steering angle sensor connector
Diagnostic procedure
End Of Sie
DTC
C1306
Steering angle sensor (abnormal initialization) system
DETECTION
CONDITION
• The steering angle sensor detects that the initialization procedure has not been performed.
POSSIBLE
CAUSE
• The initialization procedure for the steering angle sensor has not been performed.
• Steering angle sensor malfunction
• BCM malfunction
• The negative battery cable connector was disconnected previously.
• The steering angle sensor connector was disconnected previously.
• The BCM connector was disconnected previously.
• The fuse (ROOM) was removed previously.
STEP
INSPECTION
ACTION
1
VERIFY INITIALIZATION PROCEDURE.
• Has the steering angle sensor initialization
procedure been performed?
Yes
Go to the next step.
No
Perform the steering angle sensor initialization procedure,
then go to Step 3. (See 09-40-8 STEERING ANGLE
SENSOR INITIALIZATION PROCEDURE.)
2
INSPECT FOR BCM MALFUNCTION
• Turn the ignition switch off.
• Using the M-MDS, perform the DTC
inspection for the BCM.
• Are any DTCs detected?
Yes
Go to applicable DTC inspection.
(See 09-02F-2 DTC TABLE[BCM].)
No
Go to the next step.
3
VERIFY DTC TROUBLESHOOTING
COMPLETED
• Clear the DTC from the memory.
(See 04-02-3 ON-BOARD DIAGNOSIS.)
• Is the same DTC present?
Yes
Repeat the inspection from Step 1.
If the malfunction occurs again, 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 AFTER REPAIR PROCEDURE
• Are any other DTCs present?
Yes
Go to the applicable DTC inspection.
(See 04-02-3 ON-BOARD DIAGNOSIS.)
No
DTC troubleshooting completed.
1871-1U-06B(04-02).fm 29 ページ 2006年3月15日 水曜日 午前11時12分
ON-BOARD DIAGNOSTIC
04-02–30
DTC C1414
id040200805200
Diagnostic procedure
End Of Sie
DTC C1994
id040200802200
Diagnostic procedure
End Of Sie
DTC
C1414
Incorrect DSC HU/CM installed
DETECTION
CONDITION
• Detection of situation where vehicle-type or drive system input signal and DSC HU/CM information
remains incongruent through CAN information
POSSIBLE
CAUSE
• Mismatched installation of DSC HU/CM
STEP
INSPECTION
ACTION
1
VERIFY THAT THE CORRECT DSC HU/CM IS
INSTALLED
• Verify the part number of the DSC HU/CM.
• Is the part number correct?
Yes
Go to the next step.
No
After replacing the DSC HU/CM, go to Step 3.
(See 04-15-6 DSC HU/CM REMOVAL/INSTALLATION.)
2
CONFIGURE DSC HU/CM
• Can DSC HU/CM configure properly?
Yes
Go to the next step.
No
Replace the DSC HU/CM, then go to the next step.
(See 04-15-6 DSC HU/CM REMOVAL/INSTALLATION.)
3
VERIFY DTC TROUBLESHOOTING
COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear the DTC from the memory.
(See 04-02-3 ON-BOARD DIAGNOSIS.)
• Is the same DTC 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 AFTER REPAIR PROCEDURE
• Are any other DTCs present?
Yes
Go to the applicable DTC inspection.
(See 04-02-3 ON-BOARD DIAGNOSIS.)
No
DTC troubleshooting completed.
DTC
C1994
DSC control system
DETECTION
CONDITION
• DSC control for the front wheels continues for 10 s or more.
• During DSC control, the pressure increase operation to any of the all four wheels does not occur for 1.3
s or more.
POSSIBLE
CAUSE
• This does not indicate a malfunction since constant control over extended period of time is inhibited to
protect the DSC solenoid valve inside the DSC HU.
STEP
INSPECTION
ACTION
1
VERIFY DTC TROUBLESHOOTING
COMPLETED
• Clear the DTC from the memory.
(See 04-02-3 ON-BOARD DIAGNOSIS.)
• Are the same DTCs present?
Yes
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.
2
VERIFY AFTER REPAIR PROCEDURE
• Are any other DTCs present?
Yes
Go to the applicable DTC inspection.
(See 04-02-3 ON-BOARD DIAGNOSIS.)
No
DTC troubleshooting completed.
1871-1U-06B(04-02).fm 30 ページ 2006年3月15日 水曜日 午前11時12分
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