SFI SYSTEM, Diagnostic DTC:P219A

DTC Code DTC Name
P219A Bank 1 Air-Fuel Ratio Imbalance

DESCRIPTION

Refer to DTC P0300 Click here.

Refer to DTC P2195 Click here.

DTC No. DTC Detection Condition Trouble Area
P219A The difference in air fuel ratios between the cylinders exceeds the threshold (2 trip detection logic).

  • Fuel injector assembly

  • Intake system

  • Gas leaks from exhaust system

  • Ignition system

  • Compression pressure

  • Air fuel ratio sensor (sensor 1)

  • ECM

MONITOR DESCRIPTION

Fuel System Air Fuel Ratio Cylinder Imbalance Monitor

The ECM uses the air fuel ratio sensor and crankshaft position sensor to monitor the difference in air fuel ratios between the cylinders caused by differences in injection volumes between the cylinders, leakage in the intake or exhaust system, etc.

When the air fuel ratios of the cylinders are lean or rich with respect to each other, the ECM determines that a problem is present and stores a DTC.

Air Fuel Ratio Sensor Monitoring Method

When the system detects a difference in air fuel ratios between the cylinders due to fluctuation in the air fuel ratio sensor output over 1 engine cycle (2 crankshaft revolutions), the system determines that there is a problem.

Crankshaft Position Sensor Monitoring Method

The system monitors the engine speed variation and when the variation becomes large, the system determines that there is a difference in air fuel ratios between the cylinders, which it determines to be a problem.

MONITOR STRATEGY

Related DTCs P219A: Air fuel ratio cylinder imbalance monitor
Required Sensors/Components (Main)

Air fuel ratio sensor

Crankshaft position sensor
Required Sensors/Components (Related)

Mass air flow meter sub-assembly

Engine coolant temperature sensor

Vehicle speed sensor
Frequency of Operation Once per driving cycle
Duration 10 to 15 seconds
MIL Operation 2 driving cycles
Sequence of Operation None

TYPICAL ENABLING CONDITIONS

All
Monitor runs whenever the following DTCs are not stored

P0010 (VVT oil control valve)

P0011 (VVT system - advance)

P0012 (VVT system - retard)

P0016 (VVT system - misalignment)

P0031, P0032, P101D (Air fuel ratio sensor heater)

P0102, P0103 (Mass air flow meter)

P0107, P0108 (Manifold absolute pressure)

P0115, P0117, P0118 (Engine coolant temperature sensor)

P0120, P0121, P0122, P0123, P0220, P0222, P0223, P2135 (Throttle position sensor)

P0125 (Insufficient coolant temperature for closed loop fuel control)

P0327, P0328 (Knock control sensor)

P0335 (Crankshaft position sensor)

P0340, P0342, P0343 (Camshaft position sensor)

P0351, P0352, P0353, P0354 (Igniter)

P0401 (EGR system (closed))
Air Fuel Ratio Sensor Monitoring Method
Air fuel ratio sensor status Activated
Engine speed 2200 rpm or higher, and less than 2800 rpm
Engine coolant temperature 75°C (167°F) or higher
Atmospheric pressure 76 kPa(abs) [570 mmHg(abs)] or higher
Fuel system status Closed loop
Mass air flow 22 gm/sec or more, and less than 44 gm/sec
Crankshaft Position Sensor Monitoring Method (First Judgment)
Engine speed 2000 rpm or more, and less than 2400 rpm
Engine load 40% or more, and less than 60%
Engine coolant temperature 75°C (167°F) or higher
Air fuel ratio sensor status Activated
Fuel system status Closed loop
Auxiliary battery voltage 11 V or higher
Crankshaft Position Sensor Monitoring Method (Second Judgment)
Vehicle speed Less than 3 km/h (1.875 mph)
Engine speed 1050 rpm or higher, and less than 1350 rpm
Engine coolant temperature 75°C (167°F) or higher
Air fuel ratio sensor status Activated
Fuel system status Closed loop
Auxiliary battery voltage 11 V or higher

TYPICAL MALFUNCTION THRESHOLDS

Air Fuel Ratio Sensor Monitoring Method
Air fuel ratio sensor monitoring method criteria (rich side imbalance) 0.043 or more
Crankshaft Position Sensor Monitoring Method (First Judgment)
Crankshaft position sensor monitoring method criteria (first judgment) 1.5 or more
Crankshaft Position Sensor Monitoring Method (Second Judgment)
Crankshaft position sensor monitoring method criteria (second judgment) 1 or more

Tech Tips

If the first judgment while driving shows that the value of Engine Speed Fluctuation Avg (worst value) is between 0.5 and 1.5, then second judgment will be performed when the vehicle is stopped and the engine is idling.

MONITOR RESULT

Refer to detailed information in Checking Monitor Status Click here.

P219A: Fuel System / A/F SENSOR DETERMINATION B1
Monitor ID Test ID Scaling Unit Description
$81 $81 Multiply by 0.00003 No dimension Monitoring method using A/F sensor
P219A: Fuel System / ENGINE SPEED FLUCTUATION AVERAGE B1
Monitor ID Test ID Scaling Unit Description
$81 $82 Multiply by 0.001 No dimension Monitoring method using crank angle sensor

CONFIRMATION DRIVING PATTERN

A011YKXE01

  1. Connect the Techstream to the DLC3.

  2. Turn the power switch on (IG) and turn the Techstream on.

  3. Put the engine in inspection mode (maintenance mode) Click here.

  4. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher [A].

  5. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

    CAUTION:

    Use the Techstream to clear the DTCs. (Do not disconnect the cable from negative (-) auxiliary battery terminal to clear the DTCs.)

  6. Drive the vehicle at 40 km/h (25 mph).

  7. Gradually accelerate the vehicle from 40 km/h (25 mph) to 80 km/h (50 mph) taking approximately 10 to 20 seconds [B].

    Tech Tips

    Refer to Typical Enabling Conditions for mass air flow and engine speed, and then accelerate the vehicle from 80 km/h (50 mph).

  8. Drive the vehicle at 80 km/h (50 mph) or higher for 1 minute or more [C].

    CAUTION:

    When performing the confirmation driving pattern, obey all speed limits and traffic laws.

    Tech Tips

    Electrical load can be applied while the vehicle is driven.

  9. Idle the engine for 1 minute or more [D].

    Tech Tips

    With the shift lever in D.

  10. Repeat steps [B] and [D] above at least 3 times [E].

  11. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [F].

  12. Read the pending DTCs.

    Tech Tips

    • If a pending DTC is output, the system is malfunctioning.

    • If a pending DTC is not output, perform the following procedure.

  13. Drive the vehicle at 80 km/h (50 mph).

  14. Gradually accelerate the vehicle from 80 km/h (50 mph) to 100 km/h (62 mph) taking approximately 5 to 15 seconds [G].

    Tech Tips

    Refer to Typical Enabling Conditions for mass air flow and engine speed, and then accelerate the vehicle from 100 km/h (62 mph).

  15. Drive the vehicle at 100 km/h (62 mph) or higher for 1 minute or more [H].

    CAUTION:

    When performing the confirmation driving pattern, obey all speed limits and traffic laws.

    Tech Tips

    Electrical load can be applied while the vehicle is driven.

  16. Idle the engine for 1 minute or more [I].

    Tech Tips

    With the shift lever in D.

  17. Repeat steps [G] and [I] above at least 2 times [J].

  18. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [K].

  19. Read the pending DTCs.

    Tech Tips

    • If a pending DTC is output, the system is malfunctioning.

    • If a pending DTC is not output, perform the following procedure.

  20. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

  21. Input the DTC: P219A.

  22. Check the DTC judgment result.

    Techstream Display Description
    NORMAL

    • DTC judgment completed

    • System normal
    ABNORMAL

    • DTC judgment completed

    • System abnormal
    INCOMPLETE

    • DTC judgment not completed

    • Perform driving pattern after confirming DTC enabling conditions
    N/A

    • Unable to perform DTC judgment

    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    Tech Tips

    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.

    • If the judgment result shows INCOMPLETE or N/A, perform the following procedure.

  23. If no pending DTC is output, perform a universal trip and check for permanent DTCs Click here.

    Tech Tips

    • If a permanent DTC is output, the system is malfunctioning.

    • If no permanent DTC is output, the system is normal.

WIRING DIAGRAM

Refer to Fuel Injector Circuit Click here.

INSPECTION PROCEDURE

Tech Tips

  • Read freeze frame data using the Techstream. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

  • Refer to A/F Sensor Determination (worst value) #1, Engine Speed Fluctuation Avg (worst value) #1 to #4, Cylinder #1 to #4 Misfire Count, Short FT #1 and Long FT #1 in the Data List / Active Test Click here.

  • Sensor 1 refers to the sensor closest to the engine assembly.

  • Sensor 2 refers to the sensor farthest away from the engine assembly.

PROCEDURE

  1. CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P219A)

    1. Connect the Techstream to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the Techstream on.

    4. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

    5. Read the DTCs.

      Result
      Result Proceed to
      DTC P219A is output A
      DTC P219A and other DTCs are output B

      Tech Tips

      If any DTCs other than P219A are output, troubleshoot those DTCs first.

    B

    GO TO DTC CHART Click here

    A

  2. READ VALUE USING TECHSTREAM (FREEZE FRAME DATA)

    1. Connect the Techstream to the DLC3.

    2. Turn the power switch on (IG).

    3. Using the Techstream, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored Click here.

        Freeze Frame Data Items for DTC P219A

      • Vehicle Speed

      • Engine Speed

      • Calculate Load

      • Short FT #1

      • Long FT #1

      • Cylinder #1 Misfire Count to Cylinder #4 Misfire Count

      • A/F Sensor Determination (worst value) #1

      • Engine Speed Fluctuation Avg (worst value) #1 to #4

      Tech Tips

      When the sum of Short FT #1 and Long FT #1 is positive, the engine is running lean, and when the sum is negative, the engine is running rich.

    NEXT

  3. READ VALUE USING TECHSTREAM (MONITOR RESULT)

    1. Connect the Techstream to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the Techstream on.

    4. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

      Tech Tips

      • If any misfire count ("Cylinder #1 Misfire Count" to "Cylinder #4 Misfire Count) increases while idling or driving the vehicle, proceed to step 6.

      • Perform inspections while focusing on the cylinder whose misfire count has increased.

    5. Enter the following menus: Powertrain / Engine and ECT / Monitor / Current Monitor / Fuel System / Details / A/F SENSOR DETERMINATION B1 and ENGINE SPEED FLUCTUATION AVERAGE B1.

    6. Check the Test Result (A/F SENSOR DETERMINATION B1 and ENGINE SPEED FLUCTUATION AVERAGE B1).

      Result
      Result Proceed to
      A/F SENSOR DETERMINATION is Fail A
      A/F SENSOR DETERMINATION and ENGINE SPEED FLUCTUATION AVERAGE are Fail B
      ENGINE SPEED FLUCTUATION AVERAGE is Fail B*

      Tech Tips

      • When the results of A/F SENSOR DETERMINATION and ENGINE SPEED FLUCTUATION AVERAGE are both Pass, drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern again.

        If both results are still Pass, proceed to step 4.

      • *: Perform inspections while focusing on the cylinder whose engine speed fluctuation value ("Engine Speed Fluctuation Avg (worst value) #1" to "Engine Speed Fluctuation Avg (worst value) #4") was the largest.

    B

    CHECK INTAKE SYSTEM Click here

    A

  4. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE INJECTION VOLUME)

    1. Connect the Techstream to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the Techstream on.

    4. Put the engine in inspection mode (maintenance mode) Click here.

    5. Start the engine.

    6. Warm up the engine.

      Tech Tips

      The A/C switch and all accessory switches should be off and the shift lever should be in P or N.

    7. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume / Gas Misfire / Cylinder #1 to #4 Misfire Count.

      Tech Tips

      When the "Control the Injection Volume" Active Test is selected (injection volume is 0%), if a misfire count increases, proceed to step 6 (Check Intake System).

    8. Perform the Control the Injection Volume operation with the engine idling.

    9. Check the misfire counts ("Cylinder #1 Misfire Count" to "Cylinder #4 Misfire Count") while decreasing the injection volume in 5% increments.

      Note

      Do not decrease the injection volume by higher than 20%.

      Result
      The cylinder whose misfire count has not increased can be assumed to be running rich. Therefore, perform inspections while focusing on that cylinder.
    NEXT

  5. CHECK FOR EXHAUST GAS LEAK

    1. Check for exhaust gas leaks.

      OK
      No gas leaks.

      Tech Tips

      Perform "Inspection After Repair" after repairing or replacing the exhaust system Click here.

    NG

    REPAIR OR REPLACE EXHAUST SYSTEM

    OK

  6. CHECK INTAKE SYSTEM

    1. Check the intake system for vacuum leaks Click here.

      OK
      No leaks in intake system.

      Tech Tips

      Perform "Inspection After Repair" after repairing or replacing the intake system Click here.

    NG

    REPAIR OR REPLACE INTAKE SYSTEM

    OK

  7. INSPECT SPARK PLUG

    1. Inspect the spark plug of the cylinder causing the imbalance Click here.

      Tech Tips

      Perform "Inspection After Repair" after replacing the spark plug Click here.

    NG

    REPLACE SPARK PLUG Click here

    OK

  8. CHECK FOR SPARK (SPARK TEST)

    1. Perform a spark test Click here.

      Tech Tips

      • If the result of the spark test is normal, proceed to the next step.

      • Perform "Inspection After Repair" after repairing or replacing the ignition system Click here.

    NEXT

  9. CHECK CYLINDER COMPRESSION PRESSURE

    1. Measure the cylinder compression pressure of the misfiring cylinder Click here.

      Tech Tips

      Perform "Inspection After Repair" after repairing or replacing the engine assembly Click here.

    NG

    CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION

    OK

  10. CHECK TERMINAL VOLTAGE (POWER SOURCE OF FUEL INJECTOR ASSEMBLY)

    1. Disconnect the ECM connector.

      A011WLWE09

    2. Turn the power switch on (IG).

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      E28-20 (#10) - E28-50 (E01) Power switch on (IG) 11 to 14 V
      E28-17 (#20) - E28-50 (E01) Power switch on (IG) 11 to 14 V
      E28-18 (#30) - E28-50 (E01) Power switch on (IG) 11 to 14 V
      E28-19 (#40) - E28-50 (E01) Power switch on (IG) 11 to 14 V
      Text in Illustration
      *a

      Front view of wire harness connector

      (to ECM)
    NG

    GO TO FUEL INJECTOR CIRCUIT Click here

    OK

  11. CHECK FUEL INJECTOR ASSEMBLY OF CYLINDER CAUSING IMBALANCE

    1. Check the fuel injector assembly injection [whether fuel volume is high or low, and whether injection pattern is poor] Click here.

      Tech Tips

      Perform "Inspection After Repair" after replacing the fuel injector assembly Click here.

    NG

    REPLACE FUEL INJECTOR ASSEMBLY Click here

    OK

  12. CHECK FOR CAUSE OF FAILURE

    1. If the cause of the problem has not been found even after performing the troubleshooting procedure, perform the inspection below.

    2. Check the intake valve for deposits.

      Tech Tips

      As the DTC may have been stored due to deposits on the intake valve, remove the cylinder head sub-assembly and check the intake valve.

    3. Check for deposits in the EGR delivery chamber.

      Tech Tips

      The DTC may have been stored due to deposits that have accumulated in the EGR delivery chamber. Therefore, remove and inspect the EGR delivery chamber.

    NEXT

  13. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

    1. Connect the Techstream to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the Techstream on.

    4. Clear the DTCs.

    5. Turn the power switch off and wait for at least 30 seconds.

    6. Turn the power switch on (IG).

    7. Turn the Techstream on.

    8. Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

    9. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

    10. Check for DTCs.

      Result
      P219A is not output.
    NEXT

    END