Buick Regal: DTC P219A
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic
procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic approach.
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
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 Wiring Schematics (LTG)
Connector End View Reference
Component Connector End View Index
Component View Reference
Powertrain Component Views
Electrical Information Reference
- Circuit Testing
- Troubleshooting with a Test Lamp
- Testing for Intermittent Conditions and Poor Connections
- Wiring Repairs
- Connector Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
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 for further
diagnosis.
- Go to next step: If no other DTCs are set
3. Verify DTC P219A is not set.
Refer to Circuit/System Testing.
- Go to next step: 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.
Refer to Circuit/System Testing.
- Go to next step: 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.
- Go to next step: If within the specified range, inspect for the
conditions listed below:
- Modified, damaged, leaking, or restricted air induction system
components.
- Improperly operating crankcase ventilation system. Refer to Crankcase
Ventilation System Inspection/Diagnosis.
- Split, kinked, or improperly connected vacuum hoses.
- Restricted, damaged, leaking, or modified exhaust system from the
catalytic converter forward. Refer to Symptoms - Engine Exhaust.
- Improperly operating fuel injectors. Refer to Fuel Injector Diagnosis.
- Fuel contamination. Refer to Alcohol/Contaminants-in-Fuel Diagnosis.
- Excessive fuel in the crankcase due to leaking injectors. Change engine
oil as necessary.
- Improperly operating ignition system. Refer to Electronic Ignition
System Diagnosis.
- If a condition is found
Repair as necessary.
- Go to next step: 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.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
Perform the scan tool Fuel Trim Reset after completing the repair.
READ NEXT:
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic
procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic approach.
Diagnosti
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diag
SEE MORE:
Special Tools
DT-45859 Axle Remover
Equivalent regional tools: Special Tools
Removal Procedure
1. Raise and support the vehicle.
2. Remove the right rear tire and wheel assembly.
3. With the aid of an assistant holding the brake pedal down, use a breaker bar
and the proper size socket to
loosen
Diagnostic Instructions
Perform the Diagnostic System Check - Vehicle prior to using this
diagnostic procedure.
Review Strategy Based Diagnosis for an overview of the diagnostic
approach.
Diagnostic Procedure Instructions provides an overview of each
diagnostic category.
DTC Descriptors
D