No.3 There Is A Malfunction In - Mazda 2002 6 Workshop Manual

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
There is a malfunction in the system even though ABS warning light, BRAKE system warning light,
3
DSC indicator light and DSC OFF light do not illuminate.
[TROUBLESHOOTING HINTS]
• There is mechanical malfunction in system.
Diagnostic procedure
STEP
1 CHECK DSC HU/CM FOR DTCs
• Check the DTC for the DSC ON-BOARD
DIAGNOSTIC SYSTEM.
• Have DTCs been recorded in memory?
2 INSPECT DSC SYSTEM
• Perform DSC system inspection.
• Is the system okay?
*1
End Of Sie
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 OPERATES
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 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.)
Diagnostic procedure
STEP
1 CHECK FOR DTCS IN DSC HU/CM
• Check the DTC for the DSC ON-BOARD
DIAGNOSTIC SYSTEM.
• Have DTCs been recorded in memory?
2 CHECK TIRE SIZE AND AIR PRESSURE
• Inspect tire size and air pressure.
• Are size and air pressure as specified?
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?
End Of Sie
P–120
INSPECTION
INSPECTION
Yes Perform inspection using appropriate DTC.
No Go to next step.
Yes Inspect conventional brake system.
No Repair or replace malfunctioning part.
Yes Perform inspection using appropriate DTC.
No Go to next step.
Yes Go to next step.
No Replace with specified tires and adjust tire air pressure.
Yes Found malfunctioning part according to "INTERMITTENT
CONCERN TROUBLESHOOTING".
• ABS wheel-speed sensor installation inspection:
No
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.)
A6E699067650W18
ACTION
*1
: DSC SYSTEM
A6E699067650W19
ACTION