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DTC P056E:00 [PCM (SKYACTIV-X)]

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Note

•  To determine the malfunctioning part, proceed with the diagnostics from "Function Inspection Using M-MDS".

Details On DTCs

Description	Supercharger: Function malfunction due to cold temperatures
Detection condition	Determination conditions	•  The control current of the supercharger clutch is the specified value or more and the supercharger speed sensor output value is the specified value or less.
	Preconditions	•  Supercharger unit temperature (estimated value based on intake air temperature) is specified value or less •  Engine speed is specified value or more
	Drive cycle	•  1
	Self test type	•  CMDTC self test
	Sensor used	•  Supercharger speed sensor •  Supercharger clutch •  IAT Sensor No.2
Fail-safe function	•  Inhibits the boost system. •  Stops the EGR control.
Vehicle status when DTCs are output	•  Engine output is restricted. •  The PCM stores DTCs P056E:00 and P2578:00 at the same time.
Possible cause	•  Rotors in supercharger are stuck (because moisture in supercharger is frozen at 0 °C {0 °F} or less) Note •  The PCM performs controls so that moisture in the supercharger does not accumulate, but if the vehicle is repetitively driven only partially warmed up over short distances, moisture may accumulate and freeze. •  Supercharger speed sensor connectors or terminals malfunction •  PCM connector or terminals malfunction •  Supercharger malfunction •  Supercharger speed sensor malfunction •  F12 15 A fuse malfunction •  Short to ground or open circuit in supercharger speed sensor power supply circuit •  Short to ground circuit in supercharger speed sensor signal circuit •  Open circuit in any of the following supercharger speed sensor circuits. ―  Signal circuit ―  Ground circuit •  Short to power supply in any of the following supercharger speed sensor circuits. ―  Signal circuit ―  Ground circuit •  PCM malfunction

Function Explanation (DTC Detection Outline)

Repeatability Verification Procedure

1.  Start the engine and warm it up completely.

Note

•  If the engine is sufficiently warmed up when the moisture in the supercharger has frozen, the ice in the supercharger will melt and the supercharger will return to normal operation.

If freezing is not the cause, DTC P2578:00 is stored because the supercharger does not return to normal operation even though it is warmed up.

PID Item/Simulation Item Used In Diagnosis

PID/DATA monitor item table

Function Inspection Using M-MDS

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.
		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 IF CAUSE IS FREEZING •  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	DTC troubleshooting completed.
		No	P25EC:00 OR P25ED:00 is displayed •  Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC P25EC:00 [PCM (SKYACTIV-X)].) (See DTC P25ED:00 [PCM (SKYACTIV-X)].) OTHER DTCS are displayed •  Go to the next step.
4	PURPOSE: VERIFY CONNECTOR CONNECTIONS •  Start the engine. •  Access the SUPER_CHARGER_RPM PID using the M-MDS. (See PID/DATA MONITOR INSPECTION.) •  Does the PID value fluctuate when the following connectors are shaken? ―  Supercharger speed sensor ―  PCM	Yes	Repair or replace the applicable wiring harness or connector parts. Go to the next step.
		No	Go to the next step.
5	PURPOSE: DETERMINE IF MALFUNCTION IS CAUSED BY SUPERCHARGER •  Start the engine. •  Display the following PID and simulation items using the M-MDS. ―  AIR_BYPASS_VLV_POS_DSD ―  ENG_RPM_DSD ―  MAP ―  SUPER_CHARGER_IN_PRES_ACT ―  SUPER_CHARGER_RPM •  Perform the following procedure. 1.  Set the simulation item ENG_RPM_DSD to 2,000 rpm. 2.  Record the values of the PID SUPER_CHARGER_IN_PRES_ACT and MAP, and calculate the difference. 3.  Under the following conditions, set the value of the simulation item AIR_BYPASS_VLV_POS_DSD to 0 % •  Selector lever position: N position (ATX) •  Shift lever position: neutral (MTX) •  Did the engine stall?	Yes	Replace the supercharger. (See SUPERCHARGER REMOVAL/INSTALLATION [SKYACTIV-X 2.0].) Go to Troubleshooting Diagnostic Procedure to perform the repair completion verification.
		No	Go to the next step.
6	PURPOSE: DETERMINE IF MALFUNCTION IS CAUSED BY SUPERCHARGER CLUTCH •  Perform the following procedure. 1.  Set the simulation item ENG_RPM_DSD to 2,000 rpm. 2.  Under the following conditions, set the value of the simulation item AIR_BYPASS_VLV_POS_DSD to 0 % •  Selector lever position: N position (ATX) •  Shift lever position: neutral (MTX) •  Verify the value of the PID SUPER_CHARGER_RPM. •  Is the value 0?	Yes	Go to the next step.
		No	Replace the supercharger (built into supercharger clutch) because the supercharger speed sensor is normal. (See SUPERCHARGER REMOVAL/INSTALLATION [SKYACTIV-X 2.0].) Go to Troubleshooting Diagnostic Procedure to perform the repair completion verification.
7	PURPOSE: DETERMINE IF MALFUNCTION IS CAUSED BY SUPERCHARGER SPEED SENSOR •  Perform the following procedure. 1.  Set the simulation item ENG_RPM_DSD to 2,000 rpm. 2.  Under the following conditions, set the value of the simulation item AIR_BYPASS_VLV_POS_DSD to 0 % •  Selector lever position: N position (ATX) •  Shift lever position: neutral (MTX) •  Record the values of the PID SUPER_CHARGER_IN_PRES_ACT and MAP, and calculate the difference. •  When comparing the value calculated in Step 5 with the value calculated in Step 7, is the difference 5 kPa {0.05 kgf/cm2, 0.7 psi} or more?	Yes	Replace the supercharger. (See SUPERCHARGER REMOVAL/INSTALLATION [SKYACTIV-X 2.0].) Go to Troubleshooting Diagnostic Procedure to perform the repair completion verification.
		No	Replace the supercharger speed sensor. (See SUPERCHARGER SPEED SENSOR REMOVAL/INSTALLATION [SKYACTIV-X 2.0].) Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 1.

Troubleshooting Diagnostic Procedure

―  Perform an inspection of the wiring harness between the supercharger speed sensor and the power supply circuit.

―  Perform an inspection of the connectors and wiring harnesses between the supercharger speed sensor and the PCM.

―  Perform a unit inspection of the supercharger speed sensor.

―  Verify that the primary malfunction is resolved and there are no other malfunctions.

Step	Inspection	Results	Action
1	PURPOSE: INSPECT F12 15 A FUSE •  Remove the F12 15 A fuse. •  Inspect the F12 15 A fuse. •  Is the fuse normal?	Yes	Reinstall the F12 15 A fuse, then go to the next step.
		No	Replace the F12 15 A fuse and perform the repair completion verification.
2	PURPOSE: INSPECT SUPERCHARGER SPEED SENSOR POWER SUPPLY CIRCUIT FOR SHORT TO GROUND AND OPEN CIRCUIT •  Inspect the power supply circuit for an open circuit and short to ground. (See CIRCUIT INSPECTION.) •  Is the circuit normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
3	PURPOSE: INSPECT PCM CONNECTOR FOR MALFUNCTION •  Inspect the applicable connector and terminal. (See CONNECTOR INSPECTION.) •  Are the connector and terminal normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
4	PURPOSE: INSPECT SUPERCHARGER SPEED SENSOR SIGNAL CIRCUIT FOR SHORT TO GROUND •  Inspect the applicable circuit for a short to ground. (See CONNECTOR INSPECTION.) •  Is the circuit normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
5	PURPOSE: INSPECT SUPERCHARGER SPEED SENSOR SIGNAL CIRCUIT AND GROUND CIRCUIT FOR OPEN CIRCUIT •  Inspect the applicable circuit for open circuit. (See CONNECTOR INSPECTION.) •  Is the circuit normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
6	PURPOSE: INSPECT SUPERCHARGER SPEED SENSOR SIGNAL CIRCUIT AND GROUND CIRCUIT FOR SHORT TO POWER SUPPLY •  Inspect the applicable circuit for a short to power supply. (See CONNECTOR INSPECTION.) •  Is the circuit normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
7	PURPOSE: INSPECT SUPERCHARGER SPEED SENSOR FOR MALFUNCTION •  Inspect the applicable part. (See SUPERCHARGER SPEED SENSOR INSPECTION [SKYACTIV-X 2.0].) •  Is the part normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See SUPERCHARGER SPEED SENSOR REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)
Repair completion verification 1	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].)
		No	Go to the next step.
Repair completion verification 2	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.
		No	DTC troubleshooting completed.