Powertrain Management (Heavy Duty L96)
DTC P219A or P219B (Heavy Duty L96)
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 P0068, P0101, P0102, P0103, P0106, P0107, P0108, P0116, P0117, P0118, P0122, P0123, P0128, P0201-P0208, P0222, P0223, P0300, P0442, P0443, P0455, P0496, P16F3, P2101, or P2135 are not set.
* A scan tool device control is not active.
* The EVAP intrusive diagnostics are not active.
* The engine overspeed protection is not active.
* The power take-off (PTO) is not active, if equipped.
* 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 875-3,250 RPM.
* The mass air flow is between 10-1,000 g/s.
* The engine run time is greater than 120 s.
* The fuel level is greater than 10 percent.
* These DTCs run 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
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 (except L96) [1][2]Electrical DiagramsEngine Controls Schematics (L96) [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)
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 Control Module References for scan tool information
Circuit/System Testing
* 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.
* Engine idling, observe the manifold absolute pressure (MAP) sensor parameter. The MAP sensor parameter should be between 19-42 kPa.
• If not the specified range, refer to DTC P0106 (Without Heavy Duty) Powertrain Management (Without Heavy Duty)DTC P0106 (Heavy Duty L96) Powertrain Management (Heavy Duty L96) or DTC P0107 or P0108 (Heavy Duty L96) Powertrain Management (Heavy Duty L96)DTC P0107 or P0108 (Without Heavy Duty) Powertrain Management (Without Heavy Duty).
* 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.
* Inspect for vacuum leaks at the intake manifold, the throttle body, and the injector O-rings.
* Test for a restricted, damaged, leaking, or modified exhaust system from the catalytic converter forward. Refer to Symptoms - Engine Exhaust Symptoms - Engine Exhaust.
* Test the fuel injectors for improper operation. Refer to Fuel Injector Diagnosis (CH47976) Fuel System DiagnosisFuel Injector Diagnosis (J39021 or Scan Tool) Fuel System Diagnosis.
* 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 (EI) System Diagnosis.
* 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 Symptoms - Engine Mechanical.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.