Mazda 6 2002, Workshop Manual

Page: 716 / 1248

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.)