Mazda 6 2002, Workshop Manual

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ON-BOARD DIAGNOSTIC (ABS/TCS)
P–65
P
Diagnostic procedure
End Of Sie
DTC U2021
A6E697567650W16
Note
•
To warm up the engine completely, idle the engine and wait for more than 5 minutes .
Diagnostic procedure
End Of Sie
STEP INSPECTION ACTION
1 VERIFY OTHER DTC HAS BEEN RECORDED
•
Has any ABS wheel-speed sensor, sensor
rotor, solenoid valve, pump motor, or motor
relay related DTC been output?
Yes Go to applicable DTC inspection.
No Go to next step.
2 INSPECT ABS (ABS/TCS) HU/CM
OPERATION
•
Perform ABS (ABS/TCS) HU/CM system
inspection.
(See
P–27 ABS (ABS/TCS) HU/CM
SYSTEM INSPECTION
•
Is it okay?
Yes Go to next step.
No Replace ABS (ABS/TCS) HU/CM, then go to next step.
3 VERIFY CURRENT STATUS OF
MALFUNCTION
•
Clear DTC from memory.
(See
P–46 Clearing DTCs Procedures )
•
Start engine and drive vehicle at 10 km/h
{6.2 mph} or above at least one minute.
•
Gradually slow down and stop vehicle.
•
Is same DTC present?
Yes Replace ABS (ABS/TCS) HU/CM, then go to next step.
No Go to next step.
4 VERIFY AFTER REPAIR PROCEDURE
•
Is there any other DTC present?
Yes Go to applicable DTC inspection.
No Troubleshooting completed.
DTC U2021 Engine coolant temperature
DETECTION
CONDITION
•
After engine is warmed up, engine coolant temperature is 0
°
C {32
°
F} or less, and TCS operation is
inhibited by PCM.
POSSIBLE
CAUSE
•
System is normal. When engine coolant temperature rises, TCS operation is executed by PCM.
STEP INSPECTION ACTION
1 CHECK WHETHER ENGINE HAS WARMED
UP
•
Has engine warmed up?
Yes Go to next step.
No Warm up the engine.
If TCS OFF light goes out, system is normal.
2 VERIFY THAT MALFUNCTION SYMPTOM
OCCURS AFTER ENGINE IS WARMED UP
•
Warm up the engine.
•
Is TCS indicator light also illuminated and
DTC C1119 obtained?
Yes Go to DTC C1119 chart.
No If TCS OFF light goes out, system is normal.
If TCS OFF light does not goes out, go to next step.
3 VERIFY TROUBLESHOOTING COMPLETED
•
Clear DTC from memory.
(See
P–46 Clearing DTCs Procedures )
•
Is same DTC present?
Yes Replace ABS (ABS/TCS) HU/CM, then go to next step.
No Go to next step.
4 VERIFY AFTER REPAIR PROCEDURE
•
Is there any other DTC present?
Yes Go to applicable DTC inspection.
No Troubleshooting completed.