Mazda 6 2002, Workshop Manual

Page: 713 / 1248

TROUBLESHOOTING (ABS/TCS/DYNAMIC STABILITY CONTROL)
P–117
P
NO.10 TCS DOES NOT WORK CORRECTLY
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Diagnostic procedure
End Of Sie NO.11 THERE IS MALFUNCTION IN THE SYSTEM EVEN THOUGH ABS WARNING LIGHT, BRAKE SYSTEM
WARNING LIGHT, TCS OFF LIGHT, TCS INDICATOR LIGHT DO NOT ILLUMINTE
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Diagnostic procedure
End Of Sie
NO.1 ANY OF THE FOLLOWING LIGHTS DO NOT ILLUMINATE WITH IGNITION SWITCH ON: (ABS
WARNING LIGHT, BRAKE SYSTEM WARNING LIGHT, DSC INDICATOR LIGHT AND/OR DSC OFF LIGHT)
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10 TCS does not work correctly.
[TROUBLESHOOTING HINTS]
•
There is difference in size or air pressure between the front and rear tires .
•
There is malfunction in the engine control system.
•
ABS/TCS HU/CM detects TCS system malfunction .
STEP INSPECTION ACTION
1 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 or adjust tire air pressure.
2 CHECK FOR DTCS IN ABS/TCS HU/CM
Have DTCs been recorded in memory?
Yes Perform inspection using appropriate DTC.
No Go to next step.
3 CHECK FOR DTCS IN PCM
Check the DTC for the PCM ON-BOARD
DIAGNOSTIC SYSTEM.
Have DTCs been recorded in memory?
Yes Perform inspection using appropriate DTC.
No Go to next step.
4 CHECK TO MAKE SURE TORQUE
REDUCTION SIGNAL GOING FROM ABS/TCS
HU/CM TO PCM IS BEING RECEIVED
CORRECTLY
Select ENG
-
TRQ (engine torque reduction
signal) using WDS or equivalent.
Increase the engine speed to 3,000 rpm.
Input 280 N·m ENG
_
TRQ to PCM using WDS
or equivalent.
Does engine speed decrease?
Yes System is normal.
Recheck customer's complaint.
No Replace ABS/TCS HU/CM.
11
There is a malfunction in system even though ABS warning light, BRAKE system warning light, TCS
OFF light, TCS indicator light do not illuminate.
[TROUBLESHOOTING HINTS]
•
There is a difference in size or air pressure between the front and rear tires
STEP INSPECTION ACTION
1 CHECK FOR DTCs IN ABS/TCS HU/CM
Have DTCs been recorded in memory?
Yes Perform inspection using appropriate DTC.
No Go to next step.
2 INSPECT ABS HYDRAULIC UNIT
Perform "ABS hydraulic unit system inspection".
Is system okay?
Yes Inspect conventional brake system.
No If wheels do not rotate:
Replace ABS/TCS HU/CM.
If wheels rotate but order in which wheels rotate is
incorrect:
Inspect brake pipe passage to ABS/TCS HU/CM.
1
Any of the following lights do not illuminate with ignition switch on: (ABS warning light, BRAKE
system warning light, DSC indicator light and/or
DSC
OFF light).
[TROUBLESHOOTING HINTS]
•
Check each light in the instrument cluster for malfunction .
•
Poor connection at DSC HU/CM connector
•
ABS warning light circuit or BRAKE system warning light circuit shorted out
(when harness is shorted out between DSC HU/CM and ABS warning light or BRAKE system warning light, each
warning lights go off.)
•
DSC indicator light circuit and/or
DSC
OFF light circuit may be open .
(when DSC indicator light circuit and/or
DSC
OFF light circuit is open, each circuit’s warning lights go off.)