Mazda CX 7. Manual — part 347
ON-BOARD DIAGNOSTIC [BCM]
09-02F–23
09-02F
DTC C1284[BCM]
id0902f5838400
Diagnostic procedure
DTC C1284
Oil pressure switch circuit failure
DETECTION
CONDITION
Open circuit in wiring harness between BCM and oil pressure switch
POSSIBLE
CAUSE
• Open circuit in wiring harness between BCM terminal 1G and oil pressure switch terminal A
• Oil pressure switch malfunction
• BCM malfunction
STEP
INSPECTION
ACTION
1
INSPECT OIL PRESSURE SWITCH
CONNECTOR
• Turn the ignition switch off.
• Disconnect the oil pressure switch
connector.
• Inspect the oil pressure switch connector
terminals for poor connection (such as
damaged/pulled-out pins, and corrosion).
• Is there any malfunction?
Yes
Repair or replace the terminal, then go to Step 5.
No
Go to the next step.
2
INSPECT BCM CONNECTOR
• Disconnect the BCM connector.
• Inspect the BCM connector terminals for
poor connection (such as damaged/pulled-
out pins, and corrosion).
• Is there any malfunction?
Yes
Repair or replace the terminal, then go to Step 5.
No
Go to the next step.
3
INSPECT OIL PRESSURE SWITCH SIGNAL
CIRCUIT FOR OPEN CIRCUIT
• Inspect for continuity between BCM terminal
1G (wiring harness-side) and oil pressure
switch terminal A (wiring harness-side).
• Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness for a possible open
circuit, then go to Step 5.
4
INSPECT OIL PRESSURE SWITCH
• Inspect the oil pressure switch.
(See 09-22-14 OIL PRESSURE SWITCH
INSPECTION.)
• Is there any malfunction?
Yes
Replace the oil pressure switch, then go to the next step.
No
Go to the next step.
5
VERIFY TROUBLESHOOTING COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear the DTC from the BCM memory using
the M-MDS.
• Perform the self-test.
(See 09-02F-26 BCM SELF-TEST[BCM].)
• Is the same DTC present?
Yes
Replace the BCM.
(See 09-40-1 BODY CONTROL MODULE (BCM)
REMOVAL/INSTALLATION.)
No
DTC troubleshooting completed.
A
OIL PRESSURE SWITCH
BCM
1G
A
OIL PRESSURE SWITCH WIRING
HARNESS-SIDE CONNECTOR
BCM WIRING HARNESS-SIDE
CONNECTOR
1E
1G
1I
1K
1M
1O
1A
1C
1N
1L
1P
1H
1D
1B
1F
1J
1871-1U-06B(09-02F).fm 23 ページ 2006年3月15日 水曜日 午前11時41分
ON-BOARD DIAGNOSTIC [BCM]
09-02F–24
End Of Sie
DTC C1295, C1307, C1441, C1442, C1443, C1444, C144A, C144C[BCM]
id0902f5839800
DTC C1295, C1307, C1441, C1442, C1443, C1444, C144A, C144C
Steering angle sensor system
DETECTION
CONDITION
C1295
• BCM detects steering angle sensor internal abnormality (signal overflow)
C1307
• BCM detects steering angle sensor internal abnormality (signal jump)
C1441, C1442, C144C
• Open circuit in wiring harness between BCM and steering angle sensor
C1443, C1444, C144A
• Short to GND in wiring harness between BCM and steering angle sensor
POSSIBLE
CAUSE
• Improper installation or positioning of the steering angle sensor
• Steering wheel is off-center
• Open circuit in wiring harness between BCM terminal 3S and steering angle sensor terminal F
• Open circuit or short to power supply in wiring harness between BCM terminal 3Q and steering angle
sensor terminal A
• Open circuit or short to power supply in wiring harness between BCM terminal 3O and steering angle
sensor terminal C
• Open circuit or short to power supply in wiring harness between BCM terminal 3M and steering angle
sensor terminal E
• Open circuit or short to power supply in wiring harness between BCM terminal 3K and steering angle
sensor terminal D
• Open circuit in wiring harness between BCM terminal 3I and steering angle sensor terminal B
• Short to GND in wiring harness between BCM terminal 3S and steering angle sensor terminal F
• Short to GND in wiring harness between BCM terminal 3Q and steering angle sensor terminal A
• Short to GND in wiring harness between BCM terminal 3O and steering angle sensor terminal C
• Short to GND in wiring harness between BCM terminal 3M and steering angle sensor terminal E
• Short to GND in wiring harness between BCM terminal 3K and steering angle sensor terminal D
• Steering angle sensor signal circuit short each other
• Steering angle sensor malfunction
• BCM malfunction
3K
D
3I
B
3O
C
3M
E
3S
F
3Q
A
E
A
C
D
B
F
3E
3G
3I
3K
3M
3O
3A
3C
3N 3L
3P
3H
3D 3B
3F
3J
3Q
3R
3S
3T
3U
3V
3W
3X
BCM
STEERING ANGLE SENSOR WIRING
HARNESS-SIDE CONNECTOR
STEERING ANGLE SENSOR
BCM WIRING HARNESS-SIDE
CONNECTOR
1871-1U-06B(09-02F).fm 24 ページ 2006年3月15日 水曜日 午前11時41分
ON-BOARD DIAGNOSTIC [BCM]
09-02F–25
09-02F
Diagnostic procedure
STEP
INSPECTION
ACTION
1
INSPECT STEERING WHEEL FOR OFF-
CENTER
• Drive the vehicle and inspect the steering
wheel position while driving in a straight line.
• Is the steering wheel off-center?
Yes
Inspect and adjust the front wheel alignment to correct the
steering wheel alignment, then go to Step 9.
(See 02-11-2 FRONT WHEEL ALIGNMENT.)
No
Go to the next step.
2
INSPECT STEERING ANGLE SENSOR
POWER SUPPLY CIRCUIT FOR OPEN
• Turn the ignition switch to the ON position.
• Measure the voltage between the steering
angle sensor terminal F and body GND.
• Is the voltage 5 V?
Yes
Go to the next step.
No
Repair or replace the wiring harness, then go to Step 9.
3
INSPECT STEERING ANGLE SENSOR GND
CIRCUIT FOR OPEN
• Turn the ignition switch off.
• Disconnect the steering angle sensor
connector.
• Inspect for continuity between the steering
angle sensor terminal B (wiring harness-
side) and body GND.
• Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness, then go to Step 9.
4
INSPECT STEERING ANGLE SENSOR
SIGNAL CIRCUIT FOR OPEN
• Disconnect the BCM connector.
• Inspect for continuity between the following
terminals:
— BCM terminal 3Q— steering angle sensor
terminal A (wiring harness-side)
— BCM terminal 3O— steering angle sensor
terminal C (wiring harness-side)
— BCM terminal 3M— steering angle sensor
terminal E (wiring harness-side)
— BCM terminal 3K— steering angle sensor
terminal D (wiring harness-side)
• Is there continuity?
Yes
Go to the next step.
No
Repair or replace the wiring harness, then go to Step 9.
5
INSPECT STEERING ANGLE SENSOR
SIGNAL CIRCUIT FOR SHORT TO GND
• Inspect for continuity between the following
terminals and body GND:
— Steering angle sensor terminal A (wiring
harness-side)
— Steering angle sensor terminal C (wiring
harness-side)
— Steering angle sensor terminal E (wiring
harness-side)
— Steering angle sensor terminal D (wiring
harness-side)
• Is there continuity?
Yes
Repair or replace the wiring harness, then go to Step 9.
No
Go to the next step.
6
INSPECT STEERING ANGLE SENSOR
SIGNAL CIRCUIT FOR SHORT TO POWER
SUPPLY
• Measure voltage between the following and
body GND:
— Steering angle sensor terminal A (wiring
harness-side)
— Steering angle sensor terminal C (wiring
harness-side)
— Steering angle sensor terminal E (wiring
harness-side)
— Steering angle sensor terminal D (wiring
harness-side)
• Is the voltage 1 V or less?
Yes
Go to the next step.
No
Repair or replace the wiring harness, then go to Step 9.
7
INSPECT FOR IMPROPER INSTALLATION
OF STEERING ANGLE SENSOR
• Is the installation normal?
Yes
Go to the next step.
No
Repair installation or replace the steering angle sensor, then
go to Step 9.
1871-1U-06B(09-02F).fm 25 ページ 2006年3月15日 水曜日 午前11時41分
ON-BOARD DIAGNOSTIC [BCM]
09-02F–26
End Of Sie
DTC C1937[BCM]
id0902f5839300
Diagnostic procedure
End Of Sie
BCM SELF-TEST[BCM]
id0902f5830600
1. Connect the M-MDS to the DLC-2.
2. Set up the M-MDS (including the vehicle
recognition).
3. Verify the following vehicle conditions:
• All the switches are turned off (except the
ignition switch).
• All the doors, hood, and liftgate are closed.
• All the doors, and liftgate are unlocked.
• Parking brake lever is pulled.
4. Start the engine.
Note
• If the engine is not running, the BCM
determines that the oil pressure switch
malfunction.
5. Perform procedures according to directions on the M-MDS screen.
6. Verify if any DTCs are displayed.
• If any DTCs are displayed, perform the troubleshooting according to the corresponding DTC inspection.
7. Disconnect the M-MDS.
End Of Sie
8
INSPECT STEERING ANGLE SENSOR
• Inspect the steering angle sensor.
(See 09-40-8 STEERING ANGLE SENSOR
INITIALIZATION PROCEDURE.)
• Is the steering angle sensor normal?
Yes
Go to the next step.
No
Replace the steering angle sensor, then go to Step 9.
9
VERIFY TROUBLESHOOTING COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear the DTC from the BCM memory using
the M-MDS.
• Start the engine and drive the vehicle at 10
km/h {6.2 mph} or more.
• Is the same DTC present?
Yes
Replace the BCM.
(See 09-40-1 BODY CONTROL MODULE (BCM)
REMOVAL/INSTALLATION.)
No
DTC troubleshooting completed.
STEP
INSPECTION
ACTION
DTC C1937
Steering wheel angle sensor offset failure
DETECTION
CONDITION
BCM lost steering angle initialization position
POSSIBLE
CAUSE
• Steering wheel is operated suddenly during sleep control
• Steering angle sensor malfunction
• BCM malfunction
STEP
INSPECTION
ACTION
1
PERFORM STEERING ANGLE SENSOR
INITIALIZATION
• Perform steering angle sensor initialization.
(See 09-40-8 STEERING ANGLE SENSOR
INITIALIZATION PROCEDURE.)
• TCS OFF light and DSC/TCS indicator light
go out?
Yes
Inspect the steering angle sensor and related wiring
harness.
• Repair ore replace if necessary.
Go to the next step.
No
Go to the next step.
2
VERIFY TROUBLESHOOTING COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear the DTC from the BCM memory using
the M-MDS.
• Turn the ignition switch to LOCK position
then ON position.
• Is the same DTC present?
Yes
Replace the BCM.
(See 09-40-1 BODY CONTROL MODULE (BCM)
REMOVAL/INSTALLATION.)
No
DTC troubleshooting completed.
DLC-2
acxuuw00001913
1871-1U-06B(09-02F).fm 26 ページ 2006年3月15日 水曜日 午前11時41分
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