Mazda 6. Manual - part 266
P–120
TROUBLESHOOTING (ABS/TCS/DYNAMIC STABILITY CONTROL)
NO.3 THERE IS A MALFUNCTION IN THE SYSTEM EVEN THOUGH ABS WARNING LIGHT, BRAKE SYSTEM
WARNING LIGHT, DSC INDICATOR LIGHT AND DSC OFF LIGHT DO NOT ILLUMINATE
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Diagnostic procedure
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NO.4 ABS OR TCS
*1
OPERATES FREQUENTLY/TCS DOES NOT WORK CORRECTLY
*1
: DSC SYSTEM
FUNCTION CONTAINS TRACTION CONTROL FUNCTION, DSC INDICATOR LIGHT GOES ON AND OFF
WHILE DSC OPERATES
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Diagnostic procedure
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3
There is a malfunction in the system even though ABS warning light, BRAKE system warning light,
DSC indicator light and DSC OFF light do not illuminate.
[TROUBLESHOOTING HINTS]
• There is mechanical malfunction in system.
STEP
INSPECTION
ACTION
1
CHECK DSC HU/CM FOR DTCs
• Check the DTC for the DSC ON-BOARD
DIAGNOSTIC SYSTEM.
• Have DTCs been recorded in memory?
Yes
Perform inspection using appropriate DTC.
No
Go to next step.
2
INSPECT DSC SYSTEM
• Perform DSC system inspection.
• Is the system okay?
Yes
Inspect conventional brake system.
No
Repair or replace malfunctioning part.
4
ABS or TCS (*1) operates frequently./TCS does not work correctly.
(*1): DSC system function contains traction control function, DSC indicator light goes on and off
while DSC operates.
[TROUBLESHOOTING HINTS]
• There is difference in size or air pressure between the front and rear tires.
• Incorrect ABS wheel-speed signal is inputted to DSC HU/CM.
• There is malfunction in the engine control system (TCS malfunction.)
STEP
INSPECTION
ACTION
1
CHECK FOR DTCS IN DSC HU/CM
• Check the DTC for the DSC ON-BOARD
DIAGNOSTIC SYSTEM.
• Have DTCs been recorded in memory?
Yes
Perform inspection using appropriate DTC.
No
Go to next step.
2
CHECK TIRE SIZE AND AIR PRESSURE
• Inspect tire size and air pressure.
• Are size and air pressure as specified?
Yes
Go to next step.
No
Replace with specified tires and adjust tire air pressure.
3
INSPECT ABS WHEEL-SPEED SENSOR
OUTPUT PULSE
• Start engine and drive vehicle.
• Inspect output voltage pattern using WDS or
equivalent (oscilloscope).
• Is output voltage pattern okay?
Yes
Found malfunctioning part according to “INTERMITTENT
CONCERN TROUBLESHOOTING”.
No
• ABS wheel-speed sensor installation inspection:
Inspect the sensor for looseness and confirm it is
securely adhered.
• 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.)