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DTC P0397:00 [PCM (SKYACTIV-X)]

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Outline

System malfunction location	Cylinder pressure sensor No.1 circuit low input
Detection condition	•  The PCM monitors the input voltage from the cylinder pressure sensor No.1. If the input voltage at the PCM terminal 1Y is 0.29 V or below for 5 s, the PCM determines that the cylinder pressure sensor No.1 circuit has a malfunction.
Fail-safe	•  Inhibits the EGR control. •  Inhibits the SPCCI control. •  Stops the combustion control feedback. •  Retards the ignition timing.
Possible cause	•  Cylinder pressure sensor No.1 connector or terminals malfunction •  Cylinder pressure sensor No.1 malfunction •  PCM connector or terminals malfunction •  Short to ground in any of the following cylinder pressure sensor No.1 circuits. ―  Power supply circuit ―  Signal circuit •  Short circuit in cylinder pressure sensor No.1 signal circuit and ground circuit •  Open circuit in any of the following cylinder pressure sensor No.1 circuits. ―  Power supply circuit ―  Signal circuit •  PCM malfunction

Diagnostic Procedure

Step	Inspection	Results	Action
1	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.
2	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.
3	INSPECT FOR OTHER RELATED DTCs •  Perform the DTC inspection for the PCM. (See DTC INSPECTION.) •  Are any of the following DTCs displayed? ―  P03A1:00 ―  P03AB:00 ―  P03B5:00	Yes	Go to Step 6.
		No	Go to the next step.
4	INSPECT CYLINDER PRESSURE SENSOR No.1 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.
5	INSPECT CYLINDER PRESSURE SENSOR No.1 FOR MALFUNCTION •  Perform the applicable part resistance inspection. (See CYLINDER PRESSURE SENSOR INSPECTION [SKYACTIV-X 2.0].) •  Is the part normal?	Yes	Go to Step 7.
		No	Replace the cylinder pressure sensor No.1 and perform the repair completion verification. (See CYLINDER PRESSURE SENSOR REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)
6	INSPECT CYLINDER PRESSURE SENSOR No.1 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.
7	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.
8	INSPECT CYLINDER PRESSURE SENSOR No.1 POWER SUPPLY CIRCUIT AND SIGNAL 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.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
9	INSPECT CYLINDER PRESSURE SENSOR No.1 SIGNAL CIRCUIT AND GROUND CIRCUIT FOR SHORT CIRCUIT •  Inspect the applicable circuits for a short circuit. (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.
10	INSPECT CYLINDER PRESSURE SENSOR No.1 POWER SUPPLY CIRCUIT AND SIGNAL CIRCUIT FOR OPEN CIRCUIT •  Inspect the applicable circuit for open circuit. (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.
11	INSPECT CYLINDER PRESSURE SENSOR No.1 FOR MALFUNCTION •  Perform the applicable part function inspection. (See CYLINDER PRESSURE SENSOR INSPECTION [SKYACTIV-X 2.0].) •  Is the part normal?	Yes	Go to the next step.
		No	Replace the cylinder pressure sensor No.1 and perform the repair completion verification. (See CYLINDER PRESSURE 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. ―  Perform the KOEO or KOER self test. (See DTC INSPECTION.) •  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.