P219B
DTC P219A or P219B
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 Descriptors
DTC P219A
- Fuel Trim Cylinder Balance Bank 1
DTC P219B
- Fuel Trim Cylinder Balance Bank 2
Circuit/System Description
The Fuel Trim Cylinder Balance diagnostic detects a rich or lean cylinder to cylinder air/fuel ratio imbalance in each bank. 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 P0030, P0050, P0053, P0059, P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0116, P0117, P0118, P0120, P0122, P0123, P0128, P0131, P0132, P0133, P0134, P0135, P0151, P0152, P0153, P0154, P0155, P0201-P0208, P0220, P0222, P0223, P0300, P0301-P0308, P0442, P0443, P0446, P0449, P0452, P0453, P0455, P0496, P0606, P0641, P0651, P1133, P1153, P1516, P2101, P2120, P2122, P2123, P2125, P2127, P2128, P2135, P2138, P2176 are not set.
* A scan tool device control is not active.
* The intrusive diagnostics are not active.
* The engine overspeed protection is not active.
* The power take-off (PTO) is not active.
* The traction control is not active.
* The engine is in Closed Loop status.
* The system voltage is between 10-32 V for greater than 4 s.
* The engine run time is greater than 125 s.
* The engine coolant temperature (ECT) is warmer than -20°C (-4°F).
* The engine speed is between 425-6,000 RPM.
* The mass air flow is between 20-510 g/s.
* The fuel ethanol content is less than 87 percent.
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
DTCs P219A and P219B are Type B DTCs.
Conditions for Clearing the MIL/DTC
DTCs P219A and P219B are Type B DTCs.
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 (Connector End Views By Name)
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)
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Powertrain Diagnostic Trouble Code (DTC) Type Definitions)
Scan Tool Reference
Control Module References (Programming and Relearning)for scan tool information
Circuit/System Testing
1. Ignition ON, observe the scan tool DTC information. Verify there are no other DTCs set.
• If a DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code (DTC) List - Vehicle) for further diagnosis.
2. Engine idling, observe the MAP sensor parameter. The reading should be between 19-42 kPa (2.7-6 PSI).
• If not within the specified range, refer to DTC P0106 (P0106) or DTC P0107 or P0108 (P0107).
3. Ignition OFF, verify that none of the conditions listed below exists:
* Inspect the air induction system for modified, damaged, leaking, or restricted components.
* Inspect the crankcase ventilation system for improper operation. Refer to Crankcase Ventilation System Inspection/Diagnosis (Testing and Inspection).
* Inspect the vacuum hoses for splits, kinks, and improper connections.
* Test for a restricted, damaged, leaking, or modified exhaust system from the catalytic converter forward. Refer to Symptoms - Engine Exhaust (Symptoms - Engine Exhaust).
* Inspect for vacuum leaks at the intake manifold, the throttle body, and the injector O-rings.
* Test the fuel injectors for improper operation. Refer to Fuel Injector Diagnosis Component Tests and General Diagnostics.
* Test for fuel contamination. Refer to Alcohol/Contaminants-in-Fuel Diagnosis Alcohol/Contaminants-In-Fuel Diagnosis.
* Test for excessive fuel in the crankcase due to leaking injectors.
* Test the ignition system for improper operation. Refer to Electronic Ignition System Diagnosis (Electronic Ignition System Diagnosis).
4. If all the above conditions test normal, test the engine for any mechanical conditions which could alter the flow into the combustion chamber. Refer to Symptoms - Engine Mechanical (Symptoms - Engine Mechanical).
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.