DTC P219A: Air-Fuel Ratio Variation of Cylinder

NOTE: 

• Before you troubleshoot, review the general troubleshooting information - Refer to: How to Troubleshoot the Fuel and Emissions SystemsHow to Troubleshoot the CVT System(CVT System) .
• 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 (PGM-FI)

• 1. 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)

  On-board Snapshot

  - 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.

  CYLINDER A/F TEST

  Is the result OK?

  YES 

  Go to step 2.

  NO 

  The failure is duplicated. Go to step 3.

• 2. 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)

  On-board Snapshot

  Signal	Current conditions
  	Values	Unit
  VEHICLE SPEED
  ENGINE SPEED
  MAP SENSOR

  Signal	Current conditions
  	Values	Unit
  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:

  - 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:

  - 1. Inspect the valve clearance .

  Is the valve clearance OK?

  YES 

  Go to step 5.

  NO 

  Adjust the valve clearance .

• 5. 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.

  CYLINDER A/F TEST

  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:

  - 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:

  - 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.

  CYLINDER A/F TEST

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

  YES 

  Replace all injectors as a set .

  NO 

  Intermittent failure, the system is OK at this time. Check the engine for oil leaks.