PRE-RELEASE
DTC P219A or P219B
| DTC P219A or P219B |
| Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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| DTC Descriptors |
DTC P219A
Air Fuel Imbalance Bank 1
DTC P219B
Air Fuel Imbalance Bank 2
| Circuit/System Description |
The Air Fuel Imbalance 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 |
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DTCs P0053, P0059, P0068, P0090, P0091, P0092, P00C8, P00C9, P00CA, P0101, P0102, P0103, P0106, P0107, P0108, P0116, P0117, P0118, P0122, P0123, P0128, P0131, P0132, P0133, P0134, P0135, P0151, P0152, P0153, P0154, P0155, P0191, P0192, P0193, P0201-P0206, P0222, P0223, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, P0277, P0300, P0301-P0306, P0442, P0443, P0446, P0449, P0452, P0453, P0455, P0496, P0606, P1133, P1153, P1248, P1249, P124A, P124B, P124C, P124D, P16F3, P2101, P2122, P2123, P2127, P2128, P2135, P2147, P2148, P2150, P2151, P2153, P2154, P2156, P2157, P216B, P216C, P216E, P216F, P228C, P228D, P2A00, P2A03 are not set.
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Device controls are not active.
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The intrusive diagnostics are not active.
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The engine overspeed protection is not active.
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Reduced power mode is not active.
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The traction control is not active.
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The engine is in Closed Loop status.
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The system voltage is between 10-32 V for greater than 4 s.
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The engine coolant temperature (ECT) is warmer than -20°C (-4°F).
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The engine speed is between 950-2750 RPM.
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The mass air flow is between 1-600 g/s.
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| 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 |
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The air fuel imbalance 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.
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Monitoring the misfire current counters, or misfire graph, may help to isolate the cylinder that is causing the condition.
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Certain aftermarket air filters may cause a DTC to set.
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Certain aftermarket air induction systems or modifications to the air induction system may cause a DTC to set.
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Certain aftermarket exhaust system components may cause a DTC to set.
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| Reference Information |
Schematic Reference
Engine Controls Schematics (3.0L (LF1)) Engine Controls Schematics (2.8L (LAU))
Connector End View Reference
Component Connector End Views
Electrical Information Reference
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Circuit Testing
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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Connector Repairs
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DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
| Circuit/System Testing |
| 1. |
Read and record the Freeze Frame/Failure Records data taking note of the speed and load at which the DTC set.
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| 2. |
Diagnose any other DTCs that are set. Refer to
Diagnostic Trouble Code (DTC) List - Vehicle
.
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| 3. |
With the engine idling and the transmission in the Park or Neutral position, observe the Manifold Absolute Pressure (MAP) Sensor parameter. The MAP Sensor parameter should be between 20-48 kPa (2.9-7.0 psi).
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| 4. |
If the MAP Sensor parameter is not between 20-48 kPa (2.9-7.0 psi), refer to
DTC P0106 (LF1)
or
DTC P0107 or P0108 (LF1)
.
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| 5. |
Inspect the air induction system for modified, damaged, leaking, or restricted components.
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| 6. |
Inspect the crankcase ventilation system for improper operation.
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| 7. |
Inspect the vacuum hoses for splits, kinks, and improper connections.
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| 8. |
Inspect for vacuum leaks at the intake manifold, the throttle body, and the injector O-rings.
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| 9. |
Test for a restricted, damaged, leaking, or modified exhaust system from the catalytic converter forward. Refer to
Symptoms - Engine Exhaust
.
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| 10. |
Test the fuel injectors for improper operation. Refer to
Fuel Injector Solenoid Coil Test (LAU)
Fuel Injector Solenoid Coil Test (LF1, LFW)
.
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| 11. |
Test for fuel contamination. Refer to
Alcohol/Contaminants-in-Fuel Diagnosis (Special Tool)
Alcohol/Contaminants-in-Fuel Diagnosis (Without Special Tool)
.
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Test for excessive fuel in the crankcase due to leaking injectors.
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| 13. |
Test the ignition system for improper operation. Refer to
Electronic Ignition System Diagnosis
.
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| 14. |
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
.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verify the repair under the same speed and load as noted in the Freeze Frame/Failure Records data recorded during testing.
