DTC P3498:00, P349B:00 [PCM (WITH CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5))]

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Note

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

Details On DTCs

DESCRIPTION	Cylinder deactivation control system •  P3498:00: No.1 cylinder valve is stuck closed •  P349B:00: No.4 cylinder valve is stuck closed
DETECTION CONDITION	Determination conditions	•  The crankshaft fluctuation rate exceeds the specified value for every 200 rotations of the crankshaft after recovery from cylinder deactivation control.
	Preconditions	•  Battery voltage: 9—18 V*1 •  Engine speed: 500—6,500 rpm*1 •  Engine coolant temperature: 20 °C {68 °F} or more*1 •  Fuel-cut control not implemented •  Crankshaft installation tolerance learning completed •  Engine condition is stabilized (not directly after gear change) *1: Standard can be verified by displaying PIDs using the M-MDS
	Malfunction determination period	•  200 rotations of crankshaft (misfire which may damage catalytic converter)
	Drive cycle	•  1
	Self test type	•  CMDTC self test
	Sensor used	•  CKP sensor •  MAF sensor •  MAP sensor
FAIL-SAFE FUNCTION	•  Limits intake air amount •  Implement fuel-cut control (If cylinder is filled with fuel when valve is stuck closed, fuel-cut on No.1 or 4 cylinder is performed because engine could be damaged at compression stroke).
VEHICLE STATUS WHEN DTCs ARE OUTPUT	•  Possibility of engine damage occurring. ―  Check engine light turns on ―  Pending code is recorded ―  Illuminates master warning light. (Without multi-information display) ―  The master warning indication is displayed on the multi-information display. (With multi-information display) •  Rough idling, poor acceleration, stalling
POSSIBLE CAUSE	•  Improper operation of ignition system ―  Spark plug malfunction ―  Ignition coil related wiring harness or connector malfunction ―  Ignition coil malfunction •  Fuel injector malfunction ―  Improper operation of fuel injector ―  Fuel injector related wiring harness malfunction •  OCV for No.1 cylinder deactivation malfunction ―  Poor operation of OCV for No.1 cylinder deactivation ―  Related wiring harness malfunction •  OCV for No.4 cylinder deactivation malfunction ―  Poor operation of OCV for No.4 cylinder deactivation ―  Related wiring harness malfunction •  Switchable HLA malfunction •  Engine oil solenoid valve malfunction ―  Poor operation of engine oil solenoid valve ―  Related wiring harness malfunction •  Erratic signal to PCM ―  CKP sensor signal malfunction ―  ECT sensor No.1 signal malfunction ―  MAF sensor signal malfunction ―  MAP sensor signal malfunction ―  IAT sensor No.1 signal malfunction ―  APP sensor signal malfunction ―  TP sensor signal malfunction ―  VSS signal malfunction ―  Related connector or terminals malfunction ―  Related wiring harness malfunction •  Air leakage from intake air system (between intake manifold and cylinder head) •  Poor drive belt assembly or adhesion of oil •  Drive belt auto tensioner malfunction •  Engine malfunction ―  Insufficient engine compression ―  Engine coolant leakage to combustion chamber ―  Internal engine wear, damage ―  No.1 or 4 cylinder intake/exhaust valve (stuck closed) malfunction •  PCM malfunction

System Wiring Diagram

Function Explanation (DTC Detection Outline)

•  The PCM detects the crankshaft rotation speed based on the crankshaft position sensor signal. While the engine is running, the crankshaft rotation speed varies slightly by the effect of combustion at each cylinder, however, the rotation speed changes rapidly if a valve is stuck closed after recovery from cylinder deactivation control. (If valve is stuck closed, engine oil and fuel accumulates in cylinder, and by its ignition there, there is possibility of engine damage)

The PCM calculates the frequency of changes (fluctuation rate) in rapid rotation speed for every specified number of crankshaft rotations. When the crankshaft fluctuation rate exceeds a certain value after recovery from cylinder deactivation, the PCM determines that No.1 or 4 cylinder valve is stuck and stores a DTC.

P3498:00

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P349B:00

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Repeatability Verification Procedure

PID Item/Simulation Item Used In Diagnosis

Note

•  Perform the inspection using the M-MDS. The details will be updated at a later date.

Function Inspection Using M-MDS

STEP	INSPECTION	RESULTS	ACTION
1	PURPOSE: VERIFY RELATED SERVICE INFORMATION AVAILABILITY •  Verify related Service Information availability. •  Is any related Service Information available?	Yes	Perform repair or diagnosis according to the available Service Information. •  If the vehicle is not repaired, go to the next step.
		No	Go to the next step.
2	PURPOSE: IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA •  Is the DTC P3498:00 or P349B: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 (WITH CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5))].)
3	PURPOSE: RECORD FREEZE FRAME DATA/SNAPSHOT DATA AND DIAGNOSTIC MONITORING TEST RESULTS TO UTILIZE WITH REPEATABILITY VERIFICATION Note •  Recording can be facilitated using the screen capture function of the PC. •  Record the FREEZE FRAME DATA/snapshot data and DIAGNOSTIC MONITORING TEST RESULTS (misfire related) on the repair order.	—	Go to the next step.
4	PURPOSE: VERIFY RELATED PENDING CODE AND/OR DTC •  Switch the ignition off, then ON (engine off). •  Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure. (See ON-BOARD DIAGNOSTIC TEST [PCM (WITH CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5))].) •  Are any other PENDING CODEs and/or DTCs present?	Yes	Go to the applicable PENDING CODE or DTC inspection. (See DTC TABLE [PCM (WITH CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5))].)
		No	Go to the next step.
5	PURPOSE: VERIFY IF THERE IS PID ITEM CAUSING DRASTIC CHANGES OF ACCELERATION FLUCTUATION BY INPUT SIGNAL TO PCM •  Start the engine. •  Access the following PIDs using the M-MDS: (See ON-BOARD DIAGNOSTIC TEST [PCM (WITH CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5))].) ―  APP1 ―  APP2 ―  ECT ―  IAT ―  MAF ―  MAP ―  MAP_V ―  RPM ―  TP_REL ―  VSS •  Is there a PID item affected by acceleration fluctuation?	Yes	Inspect the suspected sensor and related wiring harness. •  If there is any malfunction: ―  Repair or replace the malfunctioning part. ―  Go to the troubleshooting procedure to perform the procedure from Step 10. •  If there is no malfunction: ―  Go to the next step.
		No	Go to the next step.

Troubleshooting Diagnostic Procedure

―  Perform an ignition system parts inspection.

―  Perform an engine oil related inspection.

―  Perform a fuel injector control system inspection.

―  Perform an inspection of parts which may be affected by misfire except for ignition-related parts and fuel injection control-related parts.

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

STEP	INSPECTION	RESULTS	ACTION
1	PURPOSE: DETERMINE INTEGRITY OF SPARK PLUG •  Inspect the spark plug. (See SPARK PLUG INSPECTION [WITH CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5)].) •  Is there any malfunction?	Yes	Replace the spark plug, then go to Step 15. (See SPARK PLUG REMOVAL/INSTALLATION [WITH CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5)].)
		No	Go to the next step.
2	PURPOSE: DETERMINE INTEGRITY OF IGNITION COIL •  Inspect the ignition coil. (See IGNITION COIL INSPECTION [WITH CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5)].) •  Is there any malfunction?	Yes	Replace the ignition coil/ion sensor, then go to Step 15. (See IGNITION COIL/ION SENSOR REMOVAL/INSTALLATION [WITH CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5)].)
		No	Go to the next step.
3	PURPOSE: DETERMINE INTEGRITY OF OCV FOR No.1 CYLINDER DEACTIVATION •  Inspect the OCV for No.1 cylinder deactivation. (See OIL CONTROL VALVE (OCV) FOR CYLINDER DEACTIVATION INSPECTION [WITH CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5)].) •  Is there any malfunction?	Yes	Replace the OCV for No.1 cylinder deactivation, then go to Step 15. (See OIL CONTROL VALVE (OCV) FOR CYLINDER DEACTIVATION REMOVAL/INSTALLATION [WITH CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5)].)
		No	Go to the next step.
4	PURPOSE: DETERMINE INTEGRITY OF OCV FOR No.4 CYLINDER DEACTIVATION •  Inspect the OCV for No.4 cylinder deactivation. (See OIL CONTROL VALVE (OCV) FOR CYLINDER DEACTIVATION INSPECTION [WITH CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5)].) •  Is there any malfunction?	Yes	Replace the OCV for No.4 cylinder deactivation, then go to Step 15. (See OIL CONTROL VALVE (OCV) FOR CYLINDER DEACTIVATION REMOVAL/INSTALLATION [WITH CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5)].)
		No	Go to the next step.
5	PURPOSE: DETERMINE INTEGRITY OF SWITCHABLE HLA •  Inspect the Switchable HLA. (See HYDRAULIC LASH ADJUSTER (HLA) INSPECTION [WITH CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5)].) •  Is there any malfunction?	Yes	Replace the Switchable HLA, then go to Step 15. (See HYDRAULIC LASH ADJUSTER (HLA) REMOVAL/INSTALLATION [WITH CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5)].)
		No	Go to the next step.
6	PURPOSE: DETERMINE INTEGRITY OF ENGINE OIL SOLENOID VALVE •  Inspect the engine oil solenoid valve. (See ENGINE OIL SOLENOID VALVE INSPECTION [WITH CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5)].) •  Is there any malfunction?	Yes	Replace the engine oil solenoid valve, then go to Step 15. (See ENGINE OIL SOLENOID VALVE REMOVAL/INSTALLATION [WITH CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5)].)
		No	Go to the next step.
7	PURPOSE: DETERMINE INTEGRITY OF FUEL INJECTOR •  Inspect the fuel injector. (See FUEL INJECTOR INSPECTION [WITH CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5)].) •  Is there any malfunction?	Yes	Replace the fuel injector, then go to Step 15. (See FUEL INJECTOR REMOVAL/INSTALLATION [WITH CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5)].)
		No	Go to the next step.
8	PURPOSE: VERIFY IF MALFUNCTION RELATED TO INTAKE-AIR SYSTEM IS CAUSE OF VALVE BEING STUCK CLOSED •  Visually inspect for loose, cracked or damaged hoses on intake air system. •  Is there any malfunction?	Yes	Repair or replace the malfunctioning part according to the inspection results, then go to Step 15.
		No	Go to the next step.
9	PURPOSE: VERIFY IF POOR DRIVE BELT ASSEMBLY IS CAUSE OF VALVE BEING STUCK CLOSED •  Verify the condition of the drive belt assembly. (See DRIVE BELT INSPECTION [WITH CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5)].) •  Is there any malfunction?	Yes	Assemble drive belt correctly, then go to Step 15. (See DRIVE BELT REMOVAL/INSTALLATION [WITH CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5)].)
		No	Go to the next step.
10	PURPOSE: VERIFY IF FOREIGN MATTER ON DRIVE BELT IS CAUSE OF VALVE BEING STUCK CLOSED •  Verify if oil is on the drive belt. •  Is there foreign matter on the drive belt?	Yes	Remove the foreign matter on the drive belt, then go to Step 15.
		No	Go to the next step.
11	PURPOSE: DETERMINE INTEGRITY OF DRIVE BELT AUTO TENSIONER •  Inspect the drive belt auto tensioner. (See DRIVE BELT AUTO TENSIONER INSPECTION [WITH CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5)].) •  Is there any malfunction?	Yes	Replace the drive belt auto tensioner, then go to Step 15. (See DRIVE BELT AUTO TENSIONER REMOVAL/INSTALLATION [WITH CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5)].)
		No	Go to the next step.
12	PURPOSE: VERIFY IF MALFUNCTION RELATED TO ENGINE COMPRESSION IS CAUSE OF VALVE BEING STUCK CLOSED •  Inspect the engine compression. (See COMPRESSION INSPECTION [WITH CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5)].) •  Are compression pressures within specification?	Yes	Go to the next step.
		No	Replace or overhaul the engine, then go to Step 15.
13	PURPOSE: VERIFY IF MALFUNCTION RELATED TO SEALING OF ENGINE UNIT (COMBUSTION CHAMBER AND ENGINE COOLANT PASSAGE) IS CAUSE OF MISFIRE •  Perform the “ENGINE COOLANT LEAKAGE INSPECTION”. (See ENGINE COOLANT LEAKAGE INSPECTION [WITH CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5)].) •  Does the radiator cap tester needle drop even though there is no engine coolant leakage from the radiator or the hoses?	Yes	Engine coolant leakage from the engine (between the combustion chamber and the engine coolant passage) may have occurred. •  Verify the conditions of the gasket and the cylinder head. ―  If there is any malfunction: •  Repair or replace the malfunctioning part according to the inspection results, then go to the next step.
		No	Go to the next step.
14	PURPOSE: INSPECT FOR MALFUNCTION DUE TO INTERNAL ENGINE WEAR, DAMAGE •  Inspect for the following engine internal parts: ―  Cylinder ―  Piston ring ―  Intake valve ―  Exhaust valve ―  Such as cylinder head gasket •  Are all items normal?	Yes	Engine internal parts are normal. •  Go to the next step.
		No	Repair or replace the malfunctioning part according to the inspection results, then go to the next step.
15	PURPOSE: VERIFICATION OF VEHICLE REPAIR COMPLETION •  Always reconnect all disconnected connectors. •  Clear the DTC from the PCM memory using the M-MDS. (See CLEARING DTC [PCM (WITH CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5))].) •  Start the engine and warm it up completely. Caution •  While performing this step, always operate the vehicle in a safe and lawful manner. •  When the M-MDS is used to observe monitor system status while driving, be sure to have another technician with you, or record the data in the M-MDS using the PID/DATA MONITOR AND RECORD capturing function and inspect later. •  Drive the vehicle under the snapshot data condition. •  Perform the DTC Reading Procedure. (See ON-BOARD DIAGNOSTIC TEST [PCM (WITH CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5))].) •  Is the same DTC present?	Yes	Repeat the inspection from Step 1. •  If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [WITH CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5)].) Go to the next step.
		No	Go to the next step.
16	VERIFY AFTER REPAIR PROCEDURE •  Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [PCM (WITH CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5))].) •  Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [PCM (WITH CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5))].)
		No	DTC troubleshooting completed.