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.
P0133, P2195, P2237, P2238, P2243, P2245, P2251, 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(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 1 (HDS parameter):

Problem verification 1 (HDS parameter)
?1.
Turn the vehicle to the ON mode.

?2.
Check the parameter(s) below with the HDS.
Signal
Threshold
Current conditions
Values
Unit
Values
Unit
Fuel factor study valve of No1 cylinder
0.83?1.15
      
Fuel factor study valve of No2 cylinder
0.83?1.15
      
Fuel factor study valve of No3 cylinder
0.83?1.15
      
Fuel factor study valve of No4 cylinder
0.83?1.15
      

NOTE: If the value of Fuel factor study valve is above the threshold, the PCM may detect an over-lean failure. If the value of Fuel factor study valve is below the threshold, the PCM may detect an over-rich failure.

Do the current condition(s) match the threshold?

     
YES
     
     
     
Go to step 2.
     
NO
     
     
     
The failure is duplicated. Go to step 4.
2.
On-board snapshot check:

On-board snapshot check
?1.
Check the recorded on-board snapshot parameter(s) with the HDS.
Fuel factor study valve of No1 cylinder
Fuel factor study valve of No2 cylinder
Fuel factor study valve of No3 cylinder
Fuel factor study valve of No4 cylinder

Do the parameter(s) of the recorded on-board snapshot match the threshold shown in step1-2?

     
YES
     
     
     
Go to step 3.
     
NO
     
     
     
The failure is duplicated. Go to step 4.
3.
Problem verification 2:

Problem verification 2
?1.
Start the engine.

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

?3.
Test-drive the vehicle under these conditions:
Engine coolant temperature (ECT SENSOR 1) above 158 °F (70 °C)
CVT in D, M/T in 4th
Drive at a steady engine speed between 1,000?1,200 rpm, then accelerate up to 3,400 rpm at about 10?15 seconds, and repeat this 3 times or more if needed

Signal
Current conditions
Values
Unit
ECT SENSOR 1
    
ENGINE SPEED
    

?4.
Check the parameter(s) below with the HDS.
Signal
Threshold
Current conditions
Values
Unit
Values
Unit
Fuel factor study valve of No1 cylinder
0.83?1.15
      
Fuel factor study valve of No2 cylinder
0.83?1.15
      
Fuel factor study valve of No3 cylinder
0.83?1.15
      
Fuel factor study valve of No4 cylinder
0.83?1.15
      

Do the current condition(s) match the threshold?

     
YES
     
     
     
     
NO
     
     
     
Go to step 4.
4.
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 5.
5.
Valve clearance check:

Valve clearance check
?1.
Inspect the valve clearance.

Is the valve clearance OK?

     
YES
     
     
     
Go to step 6.
     
NO
     
     
     
6.
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 (CVT in P or N, M/T 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 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
     
     
     
Go to step 7.
7.
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.?