Dtc U2021; On-Board Diagnostic - Mazda 2002 6 Workshop Manual

Diagnostic procedure
STEP
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?
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?
3 VERIFY CURRENT STATUS OF
MALFUNCTION
• Clear DTC from memory.
(See P–46 Clearing DTCs
• 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?
4 VERIFY AFTER REPAIR PROCEDURE
• Is there any other DTC present?
End Of Sie

DTC U2021

Note
• To warm up the engine completely, idle the engine and wait for more than 5 minutes.
DTC U2021
• After engine is warmed up, engine coolant temperature is 0 °C {32 °F} or less, and TCS operation is
DETECTION
CONDITION inhibited by PCM.
POSSIBLE
• System is normal. When engine coolant temperature rises, TCS operation is executed by PCM.
CAUSE
Diagnostic procedure
STEP
1 CHECK WHETHER ENGINE HAS WARMED
UP
• Has engine warmed up?
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?
3 VERIFY TROUBLESHOOTING COMPLETED
• Clear DTC from memory.
(See P–46 Clearing DTCs
• Is same DTC present?
4 VERIFY AFTER REPAIR PROCEDURE
• Is there any other DTC present?
End Of Sie
ON-BOARD DIAGNOSTIC (ABS/TCS)
INSPECTION
Procedures)
Engine coolant temperature
INSPECTION
Procedures)
Yes Go to applicable DTC inspection.
No Go to next step.
Yes Go to next step.
No Replace ABS (ABS/TCS) HU/CM, then go to next step.
Yes Replace ABS (ABS/TCS) HU/CM, then go to next step.
No Go to next step.
Yes Go to applicable DTC inspection.
No Troubleshooting completed.
Yes Go to next step.
No Warm up the engine.
If TCS OFF light goes out, system is normal.
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.
Yes Replace ABS (ABS/TCS) HU/CM, then go to next step.
No Go to next step.
Yes Go to applicable DTC inspection.
No Troubleshooting completed.
ACTION
A6E697567650W16
ACTION
P–65
P