DTC Troubleshooting: P219A
DTC P219A: Air-Fuel Ratio Variation of Cylinder
NOTE:
Before you troubleshoot, review the general troubleshooting information.
If any of the DTCs listed below are indicated at the same time as DTC P219A, troubleshoot those DTCs first, then recheck for P219A.
P0133, P1157, P1172, P2195, P2238, P2252, P2A00: A/F sensor (Sensor 1)
P0134, P0135: A/F sensor (Sensor 1) heater
P0201, P0202, P0203, P0204: No. 1?No. 4 cylinder injector(s)
P0300: Random misfire
P0301, P0302, P0303, P0304: No. 1?No. 4 cylinder misfire
P0351, P0352, P0353, P0354: No. 1?No. 4 cylinder Ignition coil power circuit

DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P219A Air-Fuel Ratio Variation of Cylinder
      

1.
Problem verification (CYLINDER A/F TEST with HDS):

Problem verification (CYLINDER A/F TEST with HDS)
?1.
Turn the vehicle to the ON mode.

?2.
Record the following HDS on-board snapshot parameters:
VEHICLE SPEED
ENGINE SPEED
MAP SENSOR
ECT SENSOR 1
APP SENSOR
AF FB (ST FUEL TRIM)

?3.
Start the engine.

?4.
Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.

?5.
Check under these conditions:
A/C off
All electrical loads off

?6.
Do the CYLINDER A/F TEST three times in the INSPECTION MENU with the HDS.

  

Is the result OK?

     
YES
     
     
     
Go to step 2.
     
NO
     
     
     
The failure is duplicated. Go to step 3.
2.
Problem verification (OBD STATUS check):

Problem verification (OBD STATUS check)
?1.
Test-drive the vehicle in the range of these recorded on-board snapshot parameters:
VEHICLE SPEED
ENGINE SPEED
MAP SENSOR
ECT SENSOR 1
APP SENSOR
AF FB (ST FUEL TRIM)
Signal
Current conditions
Values
Unit
VEHICLE SPEED
    
ENGINE SPEED
    
MAP SENSOR
    
ECT SENSOR 1
    
APP SENSOR
    
AF FB (ST FUEL TRIM)
    

?2.
Monitor the OBD STATUS for DTC P219A in the DTCs MENU with the HDS.
DTC Description
OBD STATUS
P219A Air-Fuel Ratio Variation of Cylinder
  

Does the HDS indicate FAILED?

     
YES
     
     
     
The failure is duplicated. Go to step 3.
     
NO
     
     
     
If the HDS indicates PASSED, intermittent failure, the system is OK at this time. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot. If the HDS indicates EXECUTING, continue driving until a result appears. If the HDS indicates OUT OF CONDITION, go to step 2-1 and recheck.?
3.
Engine compression check:

Engine compression check
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Do the cylinder compression test.

Is there a cylinder with lower compression than the other cylinders?

     
YES
     
     
     
Repair the engine compression problem.?
     
NO
     
     
     
Go to step 4.
4.
Valve clearance check:

Valve clearance check
?1.
Inspect the valve clearance.

Is the valve clearance OK?

     
YES
     
     
     
Go to step 5.
     
NO
     
     
     
5.
Problem verification (CYLINDER A/F TEST with HDS):

Problem verification (CYLINDER A/F TEST with HDS)
?1.
Start the engine.

?2.
Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.

?3.
Check under these conditions:
A/C off
All electrical loads off

?4.
Do the CYLINDER A/F TEST three times in the INSPECTION MENU with the HDS.

  

Is the result OK?

     
YES
     
     
     
Intermittent failure, the system is OK at this time. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.?
     
NO
     
     
     
Go to step 6.
6.
Intake and exhaust manifold visual check:

Intake and exhaust manifold visual check
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Check for carbon build-up in the intake manifold and the exhaust manifold.

Is there carbon build-up in the intake manifold and/or exhaust manifold?

     
YES
     
     
     
Check the engine for oil leaks. If needed, repair the engine, also remove the carbon.?
     
NO
     
     
     
Go to step 7.
7.
Injector check:

Injector check
?1.
Exchange the injector from the problem cylinder with one from another cylinder.

?2.
Start the engine.

?3.
Hold the engine speed at 3,000 rpm without load (in P or N) until the radiator fan comes on, then let it idle.

?4.
Check under these conditions:
A/C off
All electrical loads off

?5.
Do the CYLINDER A/F TEST three times in the INSPECTION MENU with the HDS.

  

Is an injector failure indicated at the cylinder where the injector was exchanged?

     
YES
     
     
     
     
NO
     
     
     
Intermittent failure, the system is OK at this time. Check the engine for oil leaks.?