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DTC P3400:00 [PCM (SKYACTIV-G)]

DTC P3400:00 [PCM (SKYACTIV-G)]

SM2334490

id0102t4517000

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



Details On DTCs

Description

Cylinder deactivation system malfunction
Detection condition
Determination conditions
• A condition continues in which both the intake valve and exhaust valve for No.1 or No.4 cylinder open mistakenly during cylinder deactivation control.
Preconditions
• During cylinder deactivation control
Malfunction determination period
• 0.5 s period
Drive cycle
• 2
Self test type
• CMDTC self test
Sensor used
• A/F sensor
Fail-safe function
• Inhibits the cylinder deactivation control.
Vehicle status when DTCs are output
• Not applicable
Possible cause
• Switchable HLA malfunction
• OCV for No.1 cylinder deactivation malfunction
• OCV for No.4 cylinder deactivation malfunction
• Intake valve and exhaust valve for No.1 cylinder stuck open malfunction
• Intake valve and exhaust valve for No.4 cylinder stuck open malfunction
• Engine oil solenoid valve malfunction
• Engine oil malfunction
― Use of unspecified engine oil
― Engine oil leakage
― Low engine oil pressure
― Engine oil runners are clogged or have leakage
• PCM malfunction



System Wiring Diagram

• Not applicable



Function Explanation (DTC Detection Outline)

• If both the intake valve and exhaust valve for the deactivated cylinders open mistakenly, the intake air flows to the exhaust pipe and the A/F in the exhaust gas changes to lean. If a large A/F fluctuation during cylinder deactivation is determined, the PCM determines that both the intake valve and exhaust valve for the No.1 or 4 cylinder are open, and stores a DTC.



Repeatability Verification Procedure

• Not applicable



PID Item/Simulation Item Used In Diagnosis

• Not applicable



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 Troubleshooting Diagnostic Procedure to perform the procedure from Step 1.



Troubleshooting Diagnostic Procedure

Intention of troubleshooting procedure
• Step 1
― Verify engine oil level.
• Step 2
― Verify the OCV for No.1 cylinder deactivation installation condition.
• Step 3
― Verify the OCV for No.4 cylinder deactivation installation condition.
• Step 4
― Perform a unit inspection of the switchable HLA.
• Step 5
― Verify if the intake valve and exhaust valve for the No.1 cylinder are not stuck open.
• Step 6
― Verify if the intake valve and exhaust valve for the No.4 cylinder are not stuck open.
• Step 7
― Perform a unit inspection of the engine oil solenoid valve.
• Step 8—10
― Perform an engine oil related inspection.
• Repair completion verification
― Verify that the primary malfunction is resolved and there are no other malfunctions.

Step

Inspection

Results

Action
1
PURPOSE: INSPECT ENGINE OIL LEVEL
• Switch the ignition off.
• Inspect the engine oil level. (See ENGINE OIL LEVEL INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].)
• Is the engine oil level sufficient?
Yes
Go to the next step.
No
Add genuine motor oil.
(See ENGINE OIL REPLACEMENT [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].)
Perform the “ENGINE OIL DATA RESET” and perform the repair completion verification.
(See ENGINE OIL DATA RESET [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].)
2
PURPOSE: VERIFY IF OCV FOR No.1 CYLINDER DEACTIVATION IS INSTALLED CORRECTLY
• Verify the OCV for No.1 cylinder deactivation installation condition. (See OIL CONTROL VALVE (OCV) FOR CYLINDER DEACTIVATION INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].)
• Is the installation condition normal?
Yes
Go to the next step.
No
Correctly install the OCV for No.1 cylinder deactivation and perform the repair completion verification.
(See OIL CONTROL VALVE (OCV) FOR CYLINDER DEACTIVATION REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].)
3
PURPOSE: VERIFY IF OCV FOR No.4 CYLINDER DEACTIVATION IS INSTALLED CORRECTLY
• Verify the OCV for No.4 cylinder deactivation installation condition. (See OIL CONTROL VALVE (OCV) FOR CYLINDER DEACTIVATION INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].)
• Is the installation condition normal?
Yes
Go to the next step.
No
Correctly install the OCV for No.4 cylinder deactivation and perform the repair completion verification.
(See OIL CONTROL VALVE (OCV) FOR CYLINDER DEACTIVATION REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].)
4
PURPOSE: INSPECT SWITCHABLE HLA FOR MALFUNCTION
• Inspect the applicable part. (See HYDRAULIC LASH ADJUSTER (HLA) INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].)
• Is the part normal?
Yes
Go to the next step.
No
Clean or replace the malfunctioning location and perform the repair completion verification.
(See HYDRAULIC LASH ADJUSTER (HLA) REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].)
5
PURPOSE: INSPECT CONDITION OF INTAKE VALVE AND EXHAUST VALVE FOR No.1 CYLINDER
• Inspect the condition of the intake valve and the exhaust valve for No.1 cylinder.
• Are the intake valve and the exhaust valve for No.1 cylinder stuck?
Yes
Clean or replace the stuck valve and perform the repair completion verification.
No
Go to the next step.
6
PURPOSE: INSPECT CONDITION OF INTAKE VALVE AND EXHAUST VALVE FOR No.4 CYLINDER
• Inspect the condition of the intake valve and the exhaust valve for No.4 cylinder.
• Are the intake valve and the exhaust valve for No.4 cylinder stuck?
Yes
Clean or replace the stuck valve and perform the repair completion verification.
No
Go to the next step.
7
PURPOSE: INSPECT ENGINE OIL SOLENOID VALVE FOR MALFUNCTION
• Inspect the applicable part. (See ENGINE OIL SOLENOID VALVE INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].)
• Is the part normal?
Yes
Go to the next step.
No
Repair or replace the malfunctioning location and perform the repair completion verification.
(See ENGINE OIL SOLENOID VALVE REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].)
8
PURPOSE: INSPECT IF INSUFFICIENT HYDRAULIC PRESSURE CAUSED BY USE OF UNSPECIFIED ENGINE OIL
• Is the specified engine oil being used?
Yes
Go to the next step.
No
Replace the engine oil with genuine motor oil.
(See ENGINE OIL REPLACEMENT [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].)
Perform the “ENGINE OIL DATA RESET” and perform the repair completion verification.
(See ENGINE OIL DATA RESET [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].)
9
PURPOSE: INSPECT ENGINE OIL PRESSURE
• Inspect the engine oil pressure. (See OIL PRESSURE INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].)
• Is there any malfunction?
Yes
Go to the next step.
No
Go to repair completion verification.
10
PURPOSE: VERIFY IF MALFUNCTION RELATED TO ENGINE OIL LEAK OR RESTRICTION AFFECTS DIAGNOSTIC RESULTS
• Start the engine.
• Verify if there is engine oil leakage in the oil passage or restriction.
• Is there engine oil leakage in the oil passage or restriction?
Yes
Repair or replace the malfunctioning location.
Add genuine motor oil.
(See ENGINE OIL REPLACEMENT [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].)
Perform the “ENGINE OIL DATA RESET” and perform the repair completion verification.
(See ENGINE OIL DATA RESET [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].)
No
Go to the next step.
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.
― Start the engine and warm it up completely.

Warning
• 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 freeze frame data/snapshot data condition.
• 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 [(US)].)
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-G (WITH CYLINDER DEACTIVATION (US))].)
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.