DTC Troubleshooting

Control System DTCs

DTC Troubleshooting: P219A

DTC P219A : Air-fuel Ratio Variation of Cylinders

NOTE:
* Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information How To Troubleshoot The Fuel And Emissions Systems.
* 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. 2, No. 3, or No. 4 cylinder misfire detected
- P0351, P0352, P0353, P0354: Ignition coil power circuit

1. Problem verification (CYLINDER AF TEST with the HDS):

Problem verification (CYLINDER AF TEST with the HDS)
-1. Turn the ignition switch to ON (II).

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

-3. Hold the engine speed at 3,000 rpm without load (in neutral) 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 AF TEST three times in the INSPECTION MENU with the HDS.

Is the result OK?
-YES- Go to step 2.
-NO- 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)

-2. Monitor the OBD STATUS for DTC P219A in the DTCs MENU with the HDS.

Does the HDS indicate FAILED?
-YES- The failure is duplicated. Go to step 7.
-NO- If the HDS indicates PASSED, intermittent failure, the system is OK at this time. If the HDS indicates EXECUTING, keep driving until a result comes on. If the HDS indicates OUT OF CONDITION, go to step 2-1 and recheck.

3. Engine compression check:

Engine compression check
-1. Do a cylinder compression test Engine Compression Test and Cylinder Leakage Test.

Is the compression of the problem cylinder lower than the other cylinders?
-YES- Repair the engine compression problem, then do the repair verification.
-NO- Go to step 4

4. Valve clearance check:

Valve clearance check
-1. Inspect the valve clearance. Adjustments

Is the valve clearance OK?
-YES- Go to step 5.
-NO- Adjust the valve clearance Adjustments, then do the repair verification.

5. Problem verification (CYLINDER AF TEST with the HDS):

Problem verification (CYLINDER AF TEST with the HDS)
-1. Hold the engine speed at 3,000 rpm without load (in neutral) until the radiator fan comes on, then let it idle.

-2. Check under these conditions:
* A/C off
* All electrical loads off

-3. Do the CYLINDER AF TEST three times in the INSPECTION MENU with the HDS.

Is the result OK?
-YES- Intermittent failure, the system is OK at this time.
-NO- Go to step 6.

6. Injector check:

Injector check
-1. Turn the ignition switch to LOCK (0).

-2. Exchange the injector from the problem cylinder with one from the another cylinder.

-3. Hold the engine speed at 3,000 rpm without load (in neutral) 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 AF TEST three times in the INSPECTION MENU with the HDS.

Is an injector failure indicated at the cylinder where the injector was exchanged?
-YES- Replace the faulty injector Service and Repair, then do the repair verification.
-NO- Go to step 8.

7. Valve clearance check:

Valve clearance check
-1. Inspect the valve clearance. Adjustments

Is the valve clearance OK?
-YES- Go to step 8.
-NO- Adjust the valve clearance, then do the repair verification.

8. Intake and exhaust manifold visual check (oil leak):

Intake and exhaust manifold visual check (oil leak)
-1. Check for carbon build-up in the intake manifold and the exhaust manifold.

Is there carbon build-up in the intake manifold and/or the cylinder head?
-YES- Check the engine for oil leaks. If needed, repair the engine. Remove the carbon, then do the repair verification.
-NO- Intermittent failure, the system is OK at this time. Check the engine for oil leaks.

Repair verification (OBD STATUS check):

-1. Turn the ignition switch to LOCK (0).

-2. Reset the ECM with the HDS How To Troubleshoot The Fuel And Emissions Systems.

-3. Do the ECM idle learn procedure. ECM/PCM Idle Learn Procedure

-4. 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)

-5. Monitor the OBD STATUS for DTC P219A in the DTCs MENU with the HDS.

Does the HDS indicate PASSED, FAILED, EXECUTING, or OUT OF CONDITION?
-PASSED- Troubleshooting is complete. If any other Pending or Confirmed DTCs were indicated, go to the indicated DTC's troubleshooting.
-FAILED- Go to step 1 and recheck.
-EXECUTING- Keep the test condition until a result comes on.
-OUT OF CONDITION- Meet the test condition, and check the OBD STATUS again.