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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 Instructionsprovides an overview of each diagnostic category.

DTC Descriptor
DTC P219A 00
- Fuel Trim Cylinder Balance Bank 1

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 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 P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0116, P0117, P0118, P0121, P0122, P0123, P0128, P0131, P0132, P0133, P0134, P0135, P0137, P0138, P013A - P013B, P013E - P013F, P0140, P0141, P0201 - P0204, P0261 - P0262, P0264 - P0265, P0267 - P0268, P0270 - P0271, P0300, P0301 - P0304 P0442, P0443, P0446, P0449, P0451, P0452, P0453, P0454, P0455, P0496, P1101, P1133, P1248, P1249, P124A, P124B, P1516, P2101, P2119, P2122, P2123, P2127 - P2128, P2135, P2138, P2147 - P2148, P2150 - P2151, P2153 - P2154, P2156 - P2157, P2176, P219A, P2270, P2271, P2A00 are not set.
* The device control is not active.
* The intrusive diagnostics are not active.
* The engine overspeed protection is not active.
* Reduced power mode is not active.
* The traction control is not active.
* The fuel control is in air-fuel Closed Loop.
* The system voltage is more than 10 V, or less than 32 V for more than 4 s.
* The engine coolant temperature is greater than -20°C (-4°F).
* The engine speed is greater than 1 100 RPM, but less than 4 000 RPM.
* The mass air flow is greater than 13 g/s, but less than 600 g/s.

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 B DTC.

Conditions for Clearing the DTC

DTC P219A is a Type B DTC.

Diagnostic Aids

* The air fuel imbalance diagnostic is very sensitive to heated oxygen sensor (HO2S) design. An after market sensor or an incorrect part number may set a false DTC.
* Monitoring the misfire current counters, or misfire graph, may help to isolate the cylinder that is causing the condition.

Reference Information
Schematic Reference

Engine Controls Schematics [1][2]Electrical Diagrams
Connector End View Reference

Component Connector End Views Hybrid/EV Battery Pack X1 A4
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 Referencesfor 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.
2. Diagnose any other DTCs that are set. Refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle.
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 (2.9-6.96 PSI).

• If the MAP sensor parameter is not between 20-48 kPa (2.9-6.96 PSI), refer to DTC P0106 P0106.

4. Inspect the air induction system for modified, damaged, leaking, or restricted components.
5. Inspect the crankcase ventilation system for improper operation.
6. Inspect the vacuum hoses for splits, kinks, and improper connections.
7. Test for a restricted, damaged, leaking, or modified exhaust system from the catalyst forward. Refer to Symptoms - Engine Exhaust Symptoms - Engine Exhaust.
8. Test the fuel injectors for improper operation.
9. Test for fuel contamination. Refer to Alcohol/Contaminants-in-Fuel Diagnosis Alcohol/Contaminants-in-Fuel Diagnosis.
10. Test for excessive fuel in the crankcase due to leaking injectors.
11. Test the ignition system for improper operation. Refer to Electronic Ignition System Diagnosis Electronic Ignition System Diagnosis.
12. 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. Verify the repair under the same speed and load as noted in the Freeze Frame/Failure Records data recorded during testing.

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