DTC Troubleshooting: P219C, P219D, P219E, P219F
DTC P219C: No. 1 Cylinder Air-Fuel Ratio Variation
DTC P219D: No. 2 Cylinder Air-Fuel Ratio Variation
DTC P219E: No. 3 Cylinder Air-Fuel Ratio Variation
DTC P219F: No. 4 Cylinder Air-Fuel Ratio Variation
NOTE:
Before you troubleshoot, review the general troubleshooting information.
If any of the DTCs listed below are indicated at the same time as DTC P219C, P219D, P219E, and/or P219F, troubleshoot those DTCs first, then recheck for P219C, P219D, P219E, and/or P219F.
P0131, P0132, P0133, P2195, P2237, P2238, P2243, P2251: 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(s)

DTC Description
Confirmed DTC
Pending DTC
P219C No. 1 Cylinder Air-Fuel Ratio Variation
    
P219D No. 2 Cylinder Air-Fuel Ratio Variation
    
P219E No. 3 Cylinder Air-Fuel Ratio Variation
    
P219F No. 4 Cylinder Air-Fuel Ratio Variation
    

1.
Problem verification:

Problem verification
?1.
Record all the on-board snapshots with the HDS.

?2.
Turn the vehicle to the ON mode.

?3.
Clear the DTC with the HDS.


?4.
Start the engine.

?5.
Hold the engine speed at 3,000 rpm without load (in neutral) until the radiator fan comes on, then let it idle.

?6.
Test-drive the vehicle for several minutes in the range of these recorded on-board snapshot parameters:
Engine Speed
Vehicle Speed
ECT Sensor 1
MAP Sensor (Hi Res)
REL TP Sensor
Signal
Current conditions
Values
Unit
Engine Speed
    
Vehicle Speed
    
ECT Sensor 1
    
MAP Sensor (Hi Res)
    
REL TP Sensor
    

?7.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
P219C No. 1 Cylinder Air-Fuel Ratio Variation
    
P219D No. 2 Cylinder Air-Fuel Ratio Variation
    
P219E No. 3 Cylinder Air-Fuel Ratio Variation
    
P219F No. 4 Cylinder Air-Fuel Ratio Variation
    

Is DTC P219C, P219D, P219E, and/or P219F indicated?

     
YES
     
     
     
The failure is duplicated. Go to step 2.
     
NO
     
     
     
2.
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 3.
3.
Valve clearance check:

Valve clearance check
?1.
Inspect the valve clearance.

Is the valve clearance OK?

     
YES
     
     
     
Go to step 4.
     
NO
     
     
     
4.
Injector check:

Injector check
?1.
Substitute a known-good injector(s) of the problem cylinder(s).

?2.
Turn the vehicle to the ON mode.

?3.
Clear the DTC with the HDS.


?4.
Start the engine.

?5.
Hold the engine speed at 3,000 rpm without load (in neutral) until the radiator fan comes on, then let it idle.

?6.
Test-drive the vehicle for several minutes in the range of these recorded on-board snapshot parameters:
Engine Speed
Vehicle Speed
ECT Sensor 1
MAP Sensor (Hi Res)
REL TP Sensor
Signal
Current conditions
Values
Unit
Engine Speed
    
Vehicle Speed
    
ECT Sensor 1
    
MAP Sensor (Hi Res)
    
REL TP Sensor
    

?7.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
P219C No. 1 Cylinder Air-Fuel Ratio Variation
    
P219D No. 2 Cylinder Air-Fuel Ratio Variation
    
P219E No. 3 Cylinder Air-Fuel Ratio Variation
    
P219F No. 4 Cylinder Air-Fuel Ratio Variation
    

Is the DTC(s) of the problem cylinder(s) indicated?

     
YES
     
     
     
The injector(s) is OK. Go to step 5.
     
NO
     
     
     
5.
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
     
     
     
Intermittent failure, the system is OK at this time. Check the engine for oil leaks.?