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DTC P0396:00, P03A0:00, P03AA:00 OR P03B4:00 [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	•  P0396:00: Cylinder pressure sensor No.1: Function malfunction •  P03A0:00: Cylinder pressure sensor No.2: Function malfunction •  P03AA:00: Cylinder pressure sensor No.3: Function malfunction •  P03B4:00: Cylinder pressure sensor No.4: Function malfunction
Detection condition	Determination conditions	•  If any of the following conditions is met: ―  Actual cylinder pressure value is higher or lower than estimated cylinder pressure value ―  Timing at which cylinder pressure reaches maximum value is later than target value ―  Actual cylinder pressure difference before and after top dead center is larger than target value
	Preconditions	•  Battery voltage: 9—18 V*1 •  Engine speed: 1,000—3,000 rpm or less*1 •  Charging efficiency: 0.35 or less •  Engine coolant temperature: −8 °C {18 °F} or more*1 •  Fuel-cut control is being performed •  EGR valve: Fully close*1 •  Purge control inhibited •  Not cranking •  Not stalling •  Output value of cylinder pressure sensor is normal •  Output value of CKP sensor is normal •  Output value of CMP sensor is normal •  Output value of MAP sensor is normal •  Closing angle (ATDC) of intake valve is within specified value •  The following DTCs are not detected: ―  MAP sensor: P0106:00, P0107:00 or P0108:00 ―  Intake electric variable valve timing circuit: P0010:00 or P1380:00 ―  Cylinder pressure sensor No.1: P0397:00 or P0398:00 ―  Cylinder pressure sensor No.2: P03A1:00 or P03A2:00 ―  Cylinder pressure sensor No.3: P03AB:00 or P03AC:00 ―  Cylinder pressure sensor No.4: P03B5:00 or P03B6:00 ―  ETC sensor: P0116:00, P0117:00 or P0118:00 ―  EGR valve: P0403:00 ―  EGR valve position sensor: P0405:00 or P0406:00 ―  Purge solenoid valve: P0443:00 *1: Standard can be verified by displaying PIDs using M-MDS
	Drive cycle	•  1
	Self test type	•  CMDTC self test
	Sensor used	•  Cylinder pressure sensor No.1 •  Cylinder pressure sensor No.2 •  Cylinder pressure sensor No.3 •  Cylinder pressure sensor No.4 •  MAP sensor •  CKP sensor •  CMP sensor
Fail-safe function	•  Inhibits the EGR control. •  Inhibits the SPCCI control. •  Stops the combustion control feedback. •  Retards the ignition timing.
Vehicle status when DTCs are output	•  Not applicable
Possible cause	•  Cylinder pressure sensor connectors or terminals malfunction •  PCM connector or terminals malfunction •  Short to ground in any of the following cylinder pressure sensor circuits. ―  Power supply circuit ―  Signal circuit •  Short to power supply in cylinder pressure sensor signal circuit •  Short circuit between any of the following cylinder pressure sensor circuits. ―  Power supply circuit ―  Signal circuit ―  Ground circuit •  Open circuit in any of the following cylinder pressure sensor circuits. ―  Power supply circuit ―  Signal circuit ―  Ground circuit •  Cylinder pressure sensor malfunction •  Incorrect fuel injection timing •  Fuel injector malfunction •  Insufficient engine compression •  PCM malfunction

Function Explanation (DTC Detection Outline)

―  The PCM measures the intake air pressure at the timing when the intake valve closes after the intake process (after bottom dead center) and estimates the cylinder pressure at the top dead center based on the measured value.

The PCM compares the estimated cylinder pressure value with the actual value measured by the cylinder pressure sensor, and if the actual value is higher or lower, the PCM determines a malfunction and stores a DTC.

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―  The PCM monitors the timing when the cylinder pressure reaches the maximum value based on the CKP sensor value and the camshaft position sensor value.

If the actual timing when the cylinder pressure reaches the maximum value is later than the target timing when the cylinder pressure should reach the maximum value, the PCM determines a malfunction and stores a DTC.

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―  The PCM measures the difference in the cylinder pressure before and after top dead center.

If the pressure difference is larger between the actual values measured by the cylinder pressure sensor than between the target values, the PCM determines decreased sensitivity of the cylinder pressure sensor and stores a DTC.

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Repeatability Verification Procedure

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: IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA •  Is the DTC P0396:00, P03A0:00, P03AA:00 or P03B4:00 on freeze frame data?	Yes	Go to the next step.
		No	Go to the troubleshooting procedure for DTC on freeze frame data. (See DTC TABLE [PCM (SKYACTIV-X)].)
4	VERIFY IF ANY DTC OTHER THAN ONE UNDER VERIFICATION IS STORED •  Have two or more of the following DTCs been stored? ―  P0396:00 ―  P03A0:00 ―  P03AA:00 ―  P03B4:00	Yes	Go to the next step.
		No	Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 1.
5	PURPOSE: VERIFY CONNECTOR CONNECTIONS •  Start the engine. •  Access the following PIDs using the M-MDS: (See PID/DATA MONITOR INSPECTION.) ―  MAX_CYL_PRES_#1 ―  MAX_CYL_PRES_#2 ―  MAX_CYL_PRES_#3 ―  MAX_CYL_PRES_#4 •  Does the PID value fluctuate when the following connectors are shaken? ―  Cylinder pressure sensor No.1 ―  Cylinder pressure sensor No.2 ―  Cylinder pressure sensor No.3 ―  Cylinder pressure sensor No.4 ―  PCM	Yes	Repair or replace the applicable wiring harness or connector parts. Go to Troubleshooting Diagnostic Procedure to perform the repair completion verification.
		No	Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 1.

Troubleshooting Diagnostic Procedure

―  Verify other related DTCs.

―  Perform a unit inspection of the cylinder pressure sensor.

―  Inspect the engine compression pressure.

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

Step	Inspection	Results	Action
1	PURPOSE: INSPECT FOR OTHER RELATED DTCs •  Perform the DTC inspection for the PCM. (See DTC INSPECTION.) •  Are any of the following DTCs displayed? ―  P0087:00 ―  P0172:00	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [PCM (SKYACTIV-X)].)
		No	Go to the next step.
2	PURPOSE: INSPECT CYLINDER PRESSURE SENSOR 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.
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 CYLINDER PRESSURE SENSOR 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.
5	PURPOSE: INSPECT CYLINDER PRESSURE SENSOR SIGNAL 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.
		No	Repair or replace the malfunctioning location and perform the repair completion verification.
6	PURPOSE: INSPECT CYLINDER PRESSURE SENSOR POWER SUPPLY CIRCUITS, SIGNAL CIRCUITS AND GROUND CIRCUITS 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.
7	PURPOSE: INSPECT CYLINDER PRESSURE SENSOR POWER SUPPLY CIRCUIT, SIGNAL CIRCUIT AND GROUND 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.
8	PURPOSE: INSPECT CYLINDER PRESSURE SENSOR FOR MALFUNCTION •  Inspect the applicable part. (See CYLINDER PRESSURE 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 CYLINDER PRESSURE SENSOR REMOVAL/INSTALLATION [SKYACTIV-X 2.0].)
9	PURPOSE: VERIFY IF MALFUNCTION RELATED TO ENGINE COMPRESSION AFFECTS DIAGNOSTIC RESULTS •  Inspect the engine compression. (See COMPRESSION INSPECTION [SKYACTIV-X 2.0].) •  Are compression pressures within specification?	Yes	Go to the next step.
		No	Replace or overhaul the engine and perform the repair completion verification.
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].)
		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.
		No	DTC troubleshooting completed.