DTC P0039:00 [PCM (SKYACTIV-X)]

Description	Air bypass valve control circuit range/performance problem
Detection condition	Determination conditions	• The actual opening angle of the air bypass valve is larger or smaller than its target opening angle for a continuous specified period of time.
	Preconditions	• Battery voltage: above 11 V^1 • IAT sensor No.2: 20 °C {68 °F} or more^1 • Boost air temperature sensor: 20 °C {68 °F} or more^1 • The following DTCs are not detected: ― Air bypass valve/air bypass valve position sensor: P0033:00, P2BBC:00 and P2BBD:00 ― IAT sensor No.2: P0097:00 and P0098:00 ― Boost air temperature sensor: P00EA:00 and P00EB:00 ^1: Standard can be verified by displaying PIDs using M-MDS
	Drive cycle	• 1
	Self test type	• CMDTC self test
	Sensor used	• Air bypass valve position sensor
Fail-safe function	• Inhibits the boost system. • Stops the EGR control.
Vehicle status when DTCs are output	• Not applicable
Possible cause	• Air bypass valve/air bypass valve position sensor connectors or terminals malfunction • PCM connector or terminals malfunction • Short to ground in any of the following air bypass valve/air bypass valve position sensor circuits. ― Power supply circuit ― Signal circuit ― Control (+) circuit ― Control (−) circuit • Short to power supply in any of the following air bypass valve/air bypass valve position sensor circuits. ― Signal circuit ― Ground circuit ― Control (+) circuit ― Control (−) circuit • Open circuit in any of the following air bypass valve/air bypass valve position sensor circuits. ― Power supply circuit ― Signal circuit ― Ground circuit ― Control (+) circuit ― Control (−) circuit • Air bypass valve position sensor malfunction • Air bypass valve malfunction • PCM malfunction

• The PCM calculates the target opening angle appropriate to the engine conditions against the actual opening angle detected by the air bypass valve position sensor and provides feedback to the air bypass valve control.

If the difference between the actual opening angle and the target opening angle is large, the PCM determines a malfunction in the air bypass valve and stores a DTC.

1. Warm up the engine to allow the engine coolant temperature to reach 80 °C {176 °F} or more.

2. Switch the ignition ON (engine off).

PIDs	Reference
AIR_BYPASS_VLV_POS_ACT	(See PID/DATA MONITOR TABLE [PCM (SKYACTIV-X)].)

Step	Inspection	Results	Action
1	PURPOSE: VERIFY RELATED REPAIR INFORMATION OR SERVICE INFORMATION AVAILABILITY • Verify related Service Bulletins, on-line repair information, or Service Information availability. • Is any related Information available?	Yes	Perform repair or diagnosis according to the available information. • If the vehicle is not repaired, go to the next step.
1		No	Go to the next step.
2	PURPOSE: RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION • Record the freeze frame data/snapshot data. Note • Recording can be facilitated using the screen capture function of the PC.	—	Go to the next step.
3	PURPOSE: VERIFY CONNECTOR CONNECTIONS • Access the following PIDs using the M-MDS: (See PID/DATA MONITOR INSPECTION.) ― AIR_BYPASS_VLV_POS_ACT • Does the PID value fluctuate when the following connectors are shaken? ― Air bypass valve position sensor ― PCM	Yes	Inspect the related wiring harness and connector. • Repair or replace the malfunctioning part. Go to Troubleshooting Diagnostic Procedure to perform the repair completion verification.
3		No	Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 1.

• Repair completion verification

Step	Inspection	Results	Action
1	PURPOSE: INSPECT AIR BYPASS VALVE/AIR BYPASS VALVE POSITION SENSOR POWER SUPPLY CIRCUIT AND SIGNAL CIRCUIT AND CONTROL (+) CIRCUIT AND CONTROL (−) CIRCUIT FOR SHORT TO GROUND • Inspect the applicable circuit for a short to ground. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
1		No	Repair or replace the malfunctioning location and perform the repair completion verification.
2	PURPOSE: INSPECT AIR BYPASS VALVE/AIR BYPASS VALVE POSITION SENSOR SIGNAL CIRCUIT AND GROUND CIRCUIT AND CONTROL (+) CIRCUIT AND CONTROL (−) CIRCUIT FOR SHORT TO POWER SUPPLY • Inspect the applicable circuit for a short to power supply. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
2		No	Repair or replace the malfunctioning location and perform the repair completion verification.
3	PURPOSE: INSPECT AIR BYPASS VALVE/AIR BYPASS VALVE POSITION SENSOR POWER SUPPLY CIRCUIT AND SIGNAL CIRCUIT AND GROUND CIRCUIT AND CONTROL (+) CIRCUIT AND CONTROL (−) CIRCUIT FOR OPEN CIRCUIT • Inspect the applicable circuit for open circuit. (See CIRCUIT INSPECTION.) • Is the circuit normal?	Yes	Go to the next step.
3		No	Repair or replace the malfunctioning location and perform the repair completion verification.
4	INSPECT AIR BYPASS VALVE FOR MALFUNCTION • Inspect the applicable part. (See AIR BYPASS VALVE INSPECTION [SKYACTIV-X 2.0].) • Is the part normal?	Yes	Go to the next step.
4		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See AIR BYPASS VALVE REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)
5	INSPECT AIR BYPASS VALVE POSITION SENSOR FOR MALFUNCTION • Inspect the applicable part. (See AIR BYPASS VALVE POSITION SENSOR INSPECTION [SKYACTIV-X 2.0].) • Is the part normal?	Yes	Go to the next step.
5		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See AIR BYPASS VALVE REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)
Repair completion verification 1	PURPOSE: VERIFY THAT VEHICLE IS REPAIRED • Install/connect the part removed/disconnected during the troubleshooting procedure. • Clear the DTC recorded in the memory. (See CLEARING DTC.) • Replicate the vehicle conditions at the time the DTC was detected using the following procedure. ― Implement the repeatability verification procedure. (See Repeatability Verification Procedure.) • Perform the DTC inspection for the PCM. (See DTC INSPECTION.) • Is the same Pending DTC present?	Yes	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].) If the CAN communication is normal, perform the diagnosis from Step 1. • If the malfunction recurs, replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)
Repair completion verification 1		No	Go to the next step.
Repair completion verification 2	PURPOSE: VERIFY IF OTHER DTCs DISPLAYED • Perform the DTC inspection. (See DTC INSPECTION.) • Are any other DTCs displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting.
Repair completion verification 2		No	DTC troubleshooting completed.

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