DTC P0243: Turbocharger Wastegate Solenoid 1 Circuit

CIRCUIT OPERATION

• The turbocharger wastegate solenoid 1 power is supplied from the MFI relay (terminal No. 2).
  
• The ECM controls ground the turbocharger wastegate solenoid 1 by turning the power transistor in the ECM "ON" and "OFF".
  

TECHNICAL DESCRIPTION

• To judge if there is open circuit in the turbocharger wastegate solenoid 1 drive circuit, the ECM measures the surge voltage of the turbocharger wastegate solenoid 1 coil.
  
• The ECM drives the turbocharger wastegate solenoid 1. After the solenoid is turned off, the ECM will check if the solenoid coil produces a surge voltage of 2 volts or more.
  

DESCRIPTIONS OF MONITOR METHODS

If a surge current is not generated in the coil after the turbocharger wastegate solenoid 1 has been actuated, an open circuit is determined to have occurred.

MONITOR EXECUTION

Continuous

MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)

• Not applicable
  

• Not applicable
  

DTC SET CONDITIONS

• Engine is being cranked.
  
• Battery positive voltage is between 10 and 16.5 volts.
  

• The turbocharger wastegate solenoid 1 coil surge voltage (battery positive voltage + 2 volts) is not detected for 0.2 second.
  
• The ECM monitors for this condition once during the drive cycle.
  

• Battery positive voltage is between 10 and 16.5 volts.
  
• ON duty cycle of the turbocharger wastegate solenoid 1 is between 10 and 90 percent.
  
• 1 second or more has elapsed after the above mentioned conditions have been met.
  

• The turbocharger wastegate solenoid 1 coil surge voltage (battery positive voltage + 2 volts) is not detected for 1 second after the turbocharger wastegate solenoid 1 is turned off.
  

FAIL-SAFE AND BACKUP FUNCTION

• None
  

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 23 .

TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)

• Turbocharger wastegate solenoid 1 failed.
  
• Open or shorted turbocharger wastegate solenoid 1 circuit, harness damage, or connector damage.
  
• ECM failed.
  

caution To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. (1)Connect scan tool MB991958 to the data link connector. (2)Turn the ignition switch to the "ON" position. (3)Set scan tool MB991958 to the actuator test mode for item 20, Turbocharger wastegate solenoid. An operation sound should be heard and vibration should be felt when the turbocharger wastegate solenoid 1 is operated. (4)Turn the ignition switch to the "LOCK" (OFF) position. Q. Is the solenoid operating properly? It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How Cope with Intermittent Malfunctions . Go to Step 2.

	Go to Step 3.

	Repair or replace it. Refer to GROUP 00E, Harness Connector Inspection . Then go to Step 10.

(2)Measure the resistance between turbocharger wastegate solenoid 1 side connector terminal No. 1 and No. 2. Standard value: 29 - 35 Ω [at 20°C (68°F)] Q. Is the measured resistance between 29 and 35 Ω [at 20°C (68°F)]? Go to Step 4. Replace the turbocharger wastegate solenoid 1. Then go to Step 10.

(3)Measure the voltage between terminal No. 1 and ground. Voltage should be battery positive voltage. (4)Turn the ignition switch to the "LOCK" (OFF) position. Q. Is battery positive voltage (approximately 12 volts) present? Go to Step 6. Go to Step 5.

	Repair harness wire between MFI relay connector A-34X (terminal No. 2) and turbocharger wastegate solenoid 1 connector A-10 (terminal No. 1) because of open circuit or short circuit to ground. Then go to Step 10.

	Repair or replace it. Refer to GROUP 00E, Harness Connector Inspection . Then go to Step 10.

	Go to Step 7.

	Repair or replace it. Refer to GROUP 00E, Harness Connector Inspection . Then go to Step 10.

(1)Disconnect all ECM connectors. Connect the power plant ECU check harness special tool MB992110 between the separated connectors. (2)Turn the ignition switch to the "ON" position.

(3)Measure the voltage between terminal No. 52 and ground. Voltage should be battery positive voltage. (4)Turn the ignition switch to the "LOCK" (OFF) position. Q. Is battery positive voltage (approximately 12 volts) present? Go to Step 8. Check harness connector A-13 at intermediate connector for damage, and repair or replace as required. Refer to GROUP 00E, Harness Connector Inspection . If intermediate connector is in good condition, repair harness wire between turbocharger wastegate solenoid 1 connector A-10 (terminal No. 2) and ECM connector B-09 (terminal No. 52) because of open circuit or short circuit to ground. Then go to Step 10.

	Go to Step 9.

	Repair it. Then go to Step 10.

note Check harness after checking intermediate connector A-13. If intermediate connector is damaged, repair or replace it. Refer to GROUP 00E, Harness Connector Inspection . Then go to Step 10.

	Replace the ECM. When the ECM is replaced, register the ID code. Refer to GROUP 42B, ID Code Registration Necessity Judgment Table <Vehicles with KOS> or GROUP 42C, ID Codes Registration Judgment Table <Vehicles with WCM> . Then go to Step 10.

	Repair it. Then go to Step 10.

(1)Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 23 .

	Retry the troubleshooting.

	The inspection is complete.