Mazda CX-7 2007 Workshop Manual page 822

NO.3 THERE IS A MALFUNCTION IN THE SYSTEM EVEN THOUGH ABS WARNING LIGHT, BRAKE SYSTEM
WARNING LIGHT, DSC INDICATOR LIGHT AND TCS OFF LIGHT DO NOT ILLUMINATE
There is a malfunction in the system even though the ABS warning light, BRAKE system warning
3
light, DSC indicator light and TCS OFF light do not illuminate.
[TROUBLESHOOTING HINTS]
• There is a mechanical malfunction in system
Diagnostic procedure
STEP
1 INSPECT DSC HU/CM FOR DTCs
• Inspect the DTC for the DSC ON-BOARD
DIAGNOSTIC SYSTEM.
• Have DTCs been stored in memory?
2 INSPECT DSC SYSTEM
• Perform DSC system inspection.
(See 04-15-4 DSC SYSTEM INSPECTION.)
• Is the system normal?
End Of Sie
*1
NO.4 ABS OR TCS OPERATES FREQUENTLY/TCS DOES NOT WORK CORRECTLY
FUNCTION CONTAINS TRACTION CONTROL FUNCTION, DSC INDICATOR LIGHT GOES ON AND OFF
WHILE DSC IS OPERATING
ABS or TCS (*1) operates frequently./TCS does not work correctly.
4 (*1): DSC system function contains traction control function; DSC indicator light goes on and off
while DSC is operating.
[TROUBLESHOOTING HINTS]
• There is a difference in size or air pressure between the front and rear tires
• Incorrect ABS wheel-speed signal is input to DSC HU/CM
• There is a malfunction in the engine control system (TCS malfunction)
• Tire problem (low or high air pressure, excessive wear, different grip level by four wheels)
Diagnostic procedure
STEP
1 INSPECT DTCS IN DSC HU/CM
• Inspect the DTC for the DSC ON-BOARD
DIAGNOSTIC SYSTEM.
• Have DTCs been stored in memory?
2 INSPECT TIRE SIZE AND AIR PRESSURE
• Inspect the tire size and the air pressure.
• Are size and air pressure as specified?
3 INSPECT ABS WHEEL-SPEED SENSOR
OUTPUT VALUE
• Inspect the output value from the ABS
wheel-speed sensor.
(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 output value normal?
4 VERIFY THAT TIRE CONDITION
• Verify tire condition for following:
— Wear
— Grip level (different by four wheels)
• Are tires condition okay?
End Of Sie
04-03–10
SYMPTOM TROUBLESHOOTING
INSPECTION
INSPECTION
Yes Perform the applicable DTC inspection.
(See 04-02-3 ON-BOARD DIAGNOSIS.)
No Go to the next step.
Yes Inspect the conventional brake system.
No Repair or replace any malfunctioning part.
Yes Perform the applicable DTC inspection.
(See 04-02-3 ON-BOARD DIAGNOSIS.)
No Go to the next step.
Yes Go to the next step.
No Replace with specified tires and adjust tire air pressure.
Yes Go to the next step.
• ABS wheel-speed sensor installation inspection:
No
Inspect the sensor for looseness and verify that it is
securely installed.
• Sensor rotor installation inspection:
Inspect the sensor rotor for poor installation and
chipping of sensor rotor teeth. (If sensor rotor is installed
poorly, it may cause output of abnormal wave form at
high speed.)
Yes Find malfunctioning part according to "INTERMITTENT
CONCERN TROUBLESHOOTING".
No Adjust, repair or replace tire.
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*1
: DSC SYSTEM
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