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DTC P226C: Turbocharger Wastegate Actuator Control Slow Response
 
 
 
 
CIRCUIT OPERATION
Refer to DTC P0045 - Turbocharger Wastegate Actuator Control Motor Circuit High , DTC P2564 - Turbocharger Wastegate Position Sensor Circuit Low Input .
 
 
TECHNICAL DESCRIPTION
In response to a signal from the turbocharger wastegate position sensor, the ECM controls the turbocharger wastegate actuator control motor.
 
 
DESCRIPTIONS OF MONITOR METHODS
Difference between actual turbocharger wastegate position angle and target turbocharger wastegate position angle is greater than the specified value.
 
 
MONITOR EXECUTION
  • Continuous
 
 
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)
Other Monitor (There is no temporary DTC set in memory for the item monitored below)
  • Not applicable
Sensor (The sensor below is determined to be normal)
  • Not applicable
 
 
DTC SET CONDITIONS
Logic Flow Chart
Check Conditions
  • 2 seconds or more have passed since the engine starting sequence was completed.
  • Battery positive voltage is between 9 and 16 volts.
  • Turbocharger wastegate position sensor output voltage is 4.2 volts or less. Or, target turbocharger wastegate regulating valve opening is 69 percent or less.
Judgment Criterion
  • Difference between actual turbocharger wastegate position angle and target turbocharger wastegate position angle is more than 20 percent for 5 seconds.
 
 
FAIL-SAFE AND BACKUP FUNCTION
  • Stop driving the turbocharger wastegate actuator control motor.
  • Torque is restricted.
 
 
OBD-II DRIVE CYCLE PATTERN
  • Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 1 .
 
 
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are: )
  • Turbocharger assembly failed.
  • Turbocharger wastegate actuator circuit harness damage, or connector damage.
  • ECM failed.

 
 
DIAGNOSIS
STEP 1. Check of harness damage in WGM+ line between turbocharger wastegate actuator connector and ECM connector.
Is the harness wire in good condition?
Go to Step 2.
Repair the connector(s) or wiring harness. Then go to Step 10.
 
STEP 2. Check of harness damage in WGM- line between turbocharger wastegate actuator connector and ECM connector.
Is the harness wire in good condition?
Go to Step 3.
Repair the connector(s) or wiring harness. Then go to Step 10.
 
STEP 3. Check of harness damage in WGMG line between ECM connector and ground.
Is the harness wire in good condition?
Go to Step 4.
Repair the connector(s) or wiring harness. Then go to Step 10.
 
STEP 4. Check of harness damage in WGP5 line between turbocharger wastegate actuator connector and ECM connector.
Is the harness wire in good condition?
Go to Step 5.
Repair the connector(s) or wiring harness. Then go to Step 10.
 
STEP 5. Check of harness damage in WGPS line between turbocharger wastegate actuator connector and ECM connector.
Is the harness wire in good condition?
Go to Step 6.
Repair the connector(s) or wiring harness. Then go to Step 10.
 
STEP 6. Check of harness damage in WGPG line between turbocharger wastegate actuator connector and ECM connector.
Is the harness wire in good condition?
Go to Step 7.
Repair the connector(s) or wiring harness. Then go to Step 10.
 
STEP 7. Check turbocharger wastegate actuator.
Refer to GROUP 15, On-vehicle Service - Turbocharger Wastegate Actuator Check .
Are there any abnormalities?
Replace the turbocharger assembly (integrated with turbocharger wastegate actuator). Then go to Step 10.
Go to Step 8.
 
STEP 8. Check turbocharger assembly.
(1) Visually check the turbine wheel and the compressor wheel for cracking or other damage.
(2) Check whether the turbine wheel and the compressor wheel can be easily turned by hand.
(3) Check for oil leakage from the turbocharger assembly.
noteWhen the wastegate valve is usual, it controls it as follows.
Ignition switch "Lock" (OFF) position: Open
Ignition switch "ON" position: Close
Are there any abnormalities?
Replace the turbocharger assembly. Then go to Step 10.
Go to Step 9.
 
STEP 9. Check the trouble symptoms.
(1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 1 .
(2) Check the diagnostic trouble code (DTC).
Is DTC P226C set?
Replace the ECM (Refer to Removal and Installation ). Then go to Step 10.
It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions .
 
STEP 10. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 1 .
(2) Check the diagnostic trouble code (DTC).
Is DTC P226C set?
Retry the troubleshooting.
The inspection is complete.