DTC P039A:00, P03A4:00, P03AE:00, P03B8:00 [PCM (SKYACTIV-D 2.2)]

id0102j5555500

DTC P039A:00

Cylinder No. 1 compression pressure is too low

DTC P03A4:00

Cylinder No. 2 compression pressure is too low

DTC P03AE:00

Cylinder No. 3 compression pressure is too low

DTC P03B8:00

Cylinder No. 4 compression pressure is too low
DETECTION CONDITION
•  Decrease in compression pressure of each cylinder is detected during deceleration
FAIL-SAFE FUNCTION
•  Temporarily inhibits engine-stop by i-stop control
•  Temporarily increases engine speed when engine is switched from deceleration fuel cut condition to idling fuel injection condition
•  Temporarily opens intake shutter valve and assures compression pressure
POSSIBLE CAUSE
Note
•  The DTCs are a recorded past history that the PCM detected a decrease in compression pressure of each cylinder during deceleration and operated the fail-safes previously mentioned to temporarily adjust the engine condition.
•  If the engine malfunction continues after the vehicle was serviced, take the appropriate measures according to the diagnostic procedure because the following could be considered possible causes.
•  Poor engine compression
•  Crankshaft position sensor malfunction
•  Crankshaft plate damage
•  PCM malfunction
SYSTEM WIRING DIAGRAM
Not applicable

Diagnostic Procedure

Step

Inspection

Results

Action
1
VERIFY DTC CAUSING FREEZE FRAME DATA
•  Is DTC P039A:00, P03A4:00, P03AE:00, or P03B8:00 causing the freeze frame data?
Yes
Go to the next step.
No
Inspect the DTC causing the freeze frame data.
(See DTC TABLE [PCM (SKYACTIV-D 2.2)].)
2
RECORD VEHICLE STATUS WHEN DTC WAS DETECTED TO UTILIZE WITH REPEATABILITY VERIFICATION
Note
•  Recording can be facilitated using the screen capture function of the PC.
•  Record the freeze frame data/snap shot data.
—
Go to the next step.
3
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.
4
VERIFY OTHER RELATED DTCs
•  Switch the ignition OFF, and then switch it ON (engine off).
•  Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure.
•  Is the PENDING CODE/DTC P039A:00, P03A4:00, P03AE:00, and P03B8:00 also present?
Yes
Repair the malfunctioning location according to the applicable DTC troubleshooting first, then go to the next step.
(See DTC TABLE [PCM (SKYACTIV-D 2.2)].)
No
Go to the next step.
5
VERIFY RELATED SENSOR INPUT SIGNAL
•  Start the engine and warm it up.
•  Access the following PIDs using the M-MDS:
―  ECT
―  IAT
―  MAF
―  RPM
―  APP
―  VSS
―  FRP
•  Are all items normal?
Yes
Go to the next step.
No
Repair or replace the malfunctioning location, then go to Step 7.
6
VERIFY INPUT SIGNAL FROM RELATED SENSOR WHILE DRIVING UNDER LOAD
•  Start the engine and warm it up.
•  Drive the vehicle under the condition of the freeze frame data (mode 2) recorded in Step 2 and display the following PIDs using the M-MDS under this condition.
―  ECT
―  IAT
―  MAF
―  RPM
―  APP
―  VSS
―  FRP
•  Are all items normal?
Yes
Go to the next step.
No
Repair or replace the malfunctioning location, then go to the next step.
7
INSPECT ENGINE COMPRESSION PRESSURE
•  Inspect the engine compression pressure.
•  Is the engine compression pressure normal?
Yes
Regard it as a temporary decrease in compression pressure, then go to the next step.
No
Repair or replace the malfunctioning location, then go to the next step.
8
VERIFY DTC TROUBLESHOOTING COMPLETED
•  Always reconnect all disconnected connectors.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Start the engine and drive the vehicle under the freeze frame data/snapshot data condition.
Warning
•  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.
•  While performing this step, always operate the vehicle in a safe and lawful manner.
•  Perform the DTC Reading Procedure.
•  Is the same DTC present?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the PCM, then go to the next step.
No
Go to the next step.
9
VERIFY OTHER RELATED DTCs
•  Perform the Pending Trouble Code Access Procedure.
•  Is the PENDING CODE for this DTC present?
Yes
Repair the malfunctioning location according to the applicable DTC troubleshooting first, then go to the next step.
(See DTC TABLE [PCM (SKYACTIV-D 2.2)].)
No
Go to the next step.
10
VERIFY AFTER REPAIR PROCEDURE
•  Perform the “AFTER REPAIR PROCEDURE”.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [PCM (SKYACTIV-D 2.2)].)
No
DTC troubleshooting completed.