P219A
DTC P219A
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptor
DTC P219A
- Fuel Trim Cylinder Balance
Circuit/System Description
The Fuel Trim Cylinder Balance diagnostic detects a rich or lean cylinder to cylinder air/fuel ratio imbalance. The diagnostic monitors the pre-catalyst heated oxygen sensor (HO2S) signal's frequency and amplitude characteristics by calculating an accumulated voltage over a predetermined sample period. An imbalance is indicated when multiple samples of the accumulated voltage are consistently higher than the desired value.
Conditions for Running the DTC
* DTCs P0016, P0017, P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0116, P0117, P0118, P0122, P0123, P0128, P0201-P0204, P0222, P0223, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0300, P0301-P0304, P0340, P0341, P0365, P0366, P0411, P0442, P0455, P0458, P0496, P111E, P1248, P1249, P124A, P124B, P2101, P2135, P2147, P2148, P2150. P2151, P2153, P2154, P2156, P2157, P2440, P2444 are not set.
* The evaporative emission system device control and intrusive diagnostics are not active.
* The engine overspeed protection is not active.
* The engine is in closed loop status.
* The system voltage is greater than 11 V.
* The engine coolant temperature (ECT) is warmer than -20°C (-4°F).
* The engine speed is between 1,250-4,000 RPM.
* The mass air flow is between 0-100 g/s.
* The secondary air injection pump (if equipped) is not ON.
* Engine run time is greater than 30 s.
* Fuel level is greater than 10% and no fuel level sensor fault is present.
* The DTC runs continuously when the above conditions have been met.
Conditions for Setting the DTC
Multiple samples of the pre-catalyst HO2S accumulated voltage are consistently greater than the desired value.
Action Taken When the DTC Sets
DTC P219A is a Type A DTC.
Conditions for Clearing the MIL/DTC
DTC P219A is a Type A DTC.
Diagnostic Aids
* The fuel trim cylinder balance diagnostic is very sensitive to heated oxygen sensor (HO2S) design. A non-OE sensor or an incorrect part number may cause a DTC to set.
* Monitoring the misfire current counters, or misfire graph, may help to isolate the cylinder that is causing the condition.
* Certain aftermarket air filters may cause a DTC to set.
* Certain aftermarket air induction systems or modifications to the air induction system may cause a DTC to set.
* Certain aftermarket exhaust system components may cause a DTC to set.
Reference Information
Schematic Reference
Engine Controls Schematics [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Sunshade - Left
Electrical Information Reference
* Circuit Testing Circuit Testing
* Troubleshooting with a Test Lamp Troubleshooting with a Test Lamp
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
* Connector Repairs Connector Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Control Module References for scan tool information
Circuit/System Verification
1. Ignition ON.
2. Verify no other DTCs are set.
• If any other DTCs are set
Refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.
• If no other DTCs are set
3. Verify DTC P219A is not set.
• If a DTC is set
Refer to Circuit/System Testing
• If no DTC is set
4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed in the Freeze Frame/Failure Records data.
5. Verify DTC P219A is not set.
• If a DTC is set
Refer to Circuit/System Testing
• If no DTC is set
6. All OK.
Circuit/System Testing
1. Engine idling, transmission in Park or Neutral, verify the manifold absolute pressure (MAP) sensor parameter is between 20-48 kPa.
• If not within the specified range.
Refer to DTC P0106 P0106 or DTC P0107 or P0108 P0107
• If within the specified range, inspect for the conditions listed below:
* Air induction system for modified, damaged, leaking, or restricted components.
* Crankcase ventilation system for improper operation. Refer to Crankcase Ventilation System Inspection/Diagnosis (LCV) Testing and InspectionCrankcase Ventilation System Inspection/Diagnosis (LTG) Testing and Inspection.
* Vacuum hoses for splits, kinks, and improper connections.
* Restricted, damaged, leaking, or modified exhaust system from the catalytic converter forward. Refer to Symptoms - Engine Exhaust Symptoms - Engine Exhaust.
* Fuel injectors for improper operation. Refer to Fuel Injector Solenoid Coil Test Fuel Injector Solenoid Coil Test.
* Test for fuel contamination. Refer to Alcohol/Contaminants-in-Fuel Diagnosis Testing and Inspection.
* Excessive fuel in the crankcase due to leaking injectors. Change engine oil as necessary.
* Ignition system for improper operation. Refer to Electronic Ignition System Diagnosis Electronic Ignition (EI) System Diagnosis.
• If a condition is found
Repair as necessary.
• If no condition is found
2. Test the engine for any mechanical conditions such as sticking valves, lifters, etc., which could alter the flow into the combustion chamber. Refer to Symptoms - Engine Mechanical (LCV) Symptoms - Engine MechanicalSymptoms - Engine Mechanical (LTG) Symptoms - Engine Mechanical.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.