Toyota Tundra Service Manual: Bank 1 Air-Fuel Ratio Imbalance (P219A-P219F,P21A0-P21A3)

Toyota Tundra Service Manual / Engine, Hybrid System / 1ur-fe Engine Control / Sfi System / Bank 1 Air-Fuel Ratio Imbalance (P219A-P219F,P21A0-P21A3)

DESCRIPTION

Refer to DTC P0300 (See page ).

Refer to DTC P2195 (See page ).

Refer to DTC P2197 (See page ).

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 leak from exhaust system
  • Ignition system
  • Compression pressure
  • Air fuel ratio sensor (bank 1 sensor 1)
  • ECM

P219B

The difference in air fuel ratios between the cylinders exceeds the threshold (2 trip detection logic).

  • Fuel injector assembly
  • Intake system
  • Gas leak from exhaust system
  • Ignition system
  • Compression pressure
  • Air fuel ratio sensor (bank 2 sensor 1)
  • ECM

P219C

The difference in air fuel ratios between the cylinders exceeds the threshold (2 trip detection logic).

  • Fuel injector assembly
  • Intake system
  • Gas leak from exhaust system
  • Ignition system
  • Compression pressure
  • Air fuel ratio sensor (bank 1 sensor 1)
  • ECM

P219D

The difference in air fuel ratios between the cylinders exceeds the threshold (2 trip detection logic).

  • Fuel injector assembly
  • Intake system
  • Gas leak from exhaust system
  • Ignition system
  • Compression pressure
  • Air fuel ratio sensor (bank 2 sensor 1)
  • ECM

P219E

The difference in air fuel ratios between the cylinders exceeds the threshold (2 trip detection logic).

  • Fuel injector assembly
  • Intake system
  • Gas leak from exhaust system
  • Ignition system
  • Compression pressure
  • Air fuel ratio sensor (bank 1 sensor 1)
  • ECM

P219F

The difference in air fuel ratios between the cylinders exceeds the threshold (2 trip detection logic).

  • Fuel injector assembly
  • Intake system
  • Gas leak from exhaust system
  • Ignition system
  • Compression pressure
  • Air fuel ratio sensor (bank 2 sensor 1)
  • ECM

P21A0

The difference in air fuel ratios between the cylinders exceeds the threshold (2 trip detection logic).

  • Fuel injector assembly
  • Intake system
  • Gas leak from exhaust system
  • Ignition system
  • Compression pressure
  • Air fuel ratio sensor (bank 1 sensor 1)
  • ECM

P21A1

The difference in air fuel ratios between the cylinders exceeds the threshold (2 trip detection logic).

  • Fuel injector assembly
  • Intake system
  • Gas leak from exhaust system
  • Ignition system
  • Compression pressure
  • Air fuel ratio sensor (bank 2 sensor 1)
  • ECM

P21A2

The difference in air fuel ratios between the cylinders exceeds the threshold (2 trip detection logic).

  • Fuel injector assembly
  • Intake system
  • Gas leak from exhaust system
  • Ignition system
  • Compression pressure
  • Air fuel ratio sensor (bank 1 sensor 1)
  • ECM

P21A3

The difference in air fuel ratios between the cylinders exceeds the threshold (2 trip detection logic).

  • Fuel injector assembly
  • Intake system
  • Gas leak from exhaust system
  • Ignition system
  • Compression pressure
  • Air fuel ratio sensor (bank 2 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: P219A and/or P219B are stored primarily when a rich side imbalance is detected.

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: P219C, P219D, P219E, P219F, P21A0, P21A1, P21A2 and/or P21A3 are stored primarily when a lean side imbalance is detected.

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 (Bank 1)

P219B: Air fuel ratio cylinder imbalance monitor (Bank 2)

P219C: Air fuel ratio cylinder imbalance monitor (Cylinder 1)

P219D: Air fuel ratio cylinder imbalance monitor (Cylinder 2)

P219E: Air fuel ratio cylinder imbalance monitor (Cylinder 3)

P219F: Air fuel ratio cylinder imbalance monitor (Cylinder 4)

P21A0: Air fuel ratio cylinder imbalance monitor (Cylinder 5)

P21A1: Air fuel ratio cylinder imbalance monitor (Cylinder 6)

P21A2: Air fuel ratio cylinder imbalance monitor (Cylinder 7)

P21A3: Air fuel ratio cylinder imbalance monitor (Cylinder 8)

Required Sensors/Components (Main)

Air fuel ratio sensor

Crankshaft position sensor

Required Sensors/Components (Related)

Mass air flow meter assembly

Engine coolant temperature sensor

Vehicle speed sensor

Frequency of Operation

Once per driving cycle

Duration

10 seconds: Air fuel ratio sensor open circuit between AF+ and AF- and low impedance

30 seconds: Crankshaft position sensor monitoring method

MIL Operation

2 driving cycles

Sequence of Operation

None

TYPICAL ENABLING CONDITIONS

ALL

Monitor runs whenever following DTCs not stored

P0010, P0020 (VVT oil control valve)

P0011, P0021 (VVT system - Advance)

P0012, P0022 (VVT system - Retard)

P0013, P0023 (Exhaust VVT oil control valve)

P0014, P0024 (Exhaust VVT system - Advance)

P0015, P0025 (Exhaust VVT system - Retard)

P0016, P0018 (VVT system - Misalignment)

P0017, P0019 (Exhaust VVT system - Misalignment)

P0031, P0032, P0051, P0052, P101D, P103D (Air fuel ratio sensor heater)

P006A, P0107, P0108 (Manifold absolute pressure)

P0102, P0103 (Mass air flow meter)

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)

P0335 (Crankshaft position sensor)

P0340, P0342, P0343, P0345, P0347, P0348 (VVT sensor)

P1340 (Camshaft position sensor)

P0351 - P0358 (Igniter)

P0365, P0367, P0368, P0390, P0392, P0393 (Exhaust VVT sensor)

P0401 (EGR system)

P0412, P0415, P0418, P0419, P1613, P1614 (Secondary Air Injection System Control)

P0500 (Vehicle speed sensor)

P2440, P2441, P2442, P2443, P2444, P2445, P2446, P2447 (Secondary Air Injection System)

P219A, P219B: Air Fuel Ratio Sensor Monitoring Method

Air fuel ratio sensor status

Activated

Engine speed

1400 to 2200 rpm

Engine coolant temperature

75°C (167°F) or higher

Atmospheric pressure

76 kPa (570 mmHg) or higher

Fuel system status

Closed loop

P219C, P219D, P219E, P219F, P21A0, P21A1, P21A2, P21A3: Crankshaft Position Sensor Monitoring Method

Vehicle speed

Less than 3 km/h (1.875 mph)

Engine speed

400 to 1000 rpm

Engine coolant temperature

75°C (167°F) or higher

Air fuel ratio sensor status

Activated

Battery voltage

11 V or higher

Fuel system status

Closed loop

TYPICAL MALFUNCTION THRESHOLDS

P219A: Air Fuel Ratio Sensor Monitoring Method (Bank 1)

A/F sensor monitoring method criteria

0.175 or more

P219B: Air Fuel Ratio Sensor Monitoring Method (Bank 2)

A/F sensor monitoring method criteria

0.225 or more

P219C, P219D, P219E, P219F, P21A0, P21A1, P21A2, P21A3: Crankshaft Position Sensor Monitoring Method

Crankshaft position sensor monitoring method criteria

1.0 or more

MONITOR RESULT

Refer to detailed information in Checking Monitor Status (See page ).

CONFIRMATION DRIVING PATTERN

  1. Connect the Techstream to the DLC3.
  2. Turn the ignition switch to ON.
  3. Turn the Techstream on.
  4. Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher [A].

    HINT:

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

  5. Clear the DTCs (even if no DTCs are stored, perform the clear DTC operation).
  6. Drive the vehicle at 60 km/h (38 mph) or higher for 2 minutes or more [B].

    CAUTION:

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

    HINT:

    It is acceptable to turn electrical loads on while driving.

  7. Idle the engine for 2 minutes or more [C].

    HINT:

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

  8. Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [D].
  9. Read the pending DTCs.

    HINT:

    • If a pending DTC is output, the system is malfunctioning.
    • If a pending DTC is not output, perform the following procedure.
  10. Drive the vehicle at less than 30 km/h (19 mph) for 5 seconds or more [E].
  11. Accelerate the vehicle from 30 to 60 km/h (19 to 38 mph) over a period of approximately 10 to 20 seconds.

    HINT:

    Refer to the values of mass air flow and engine speed in Typical Enabling Conditions before accelerating the vehicle from 30 to 60 km/h (19 to 38 mph).

  12. Drive the vehicle at 60 km/h (38 mph) or higher for 5 seconds or more [F].

    CAUTION:

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

  13. Drive the vehicle at less than 30 km/h (19 mph) for 5 seconds or more [G].

    CAUTION:

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

  14. Accelerate the vehicle from 30 to 60 km/h (19 to 38 mph) over a period of approximately 10 to 20 seconds.

    CAUTION:

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

    HINT:

    Refer to the values of mass air flow and engine speed in Typical Enabling Conditions before accelerating the vehicle from 30 to 60 km/h (19 to 38 mph).

  15. Drive the vehicle at 60 km/h (38 mph) or more for 5 seconds or more [H].

    CAUTION:

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

  16. Repeat steps [G] through [H] above at least 2 times [I].
  17. Idle the engine for 1 minute or more [J].

    HINT:

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

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

    HINT:

    • 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, P219B, P219C, P219D, P219E, P219F, P21A0, P21A1, P21A2, P21A3.
  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

    HINT:

    • 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 (See page ).

    HINT:

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

CAUTION / NOTICE / HINT

HINT:

  • Read freeze frame data using the Techstream. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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.
  • Bank 1 refers to the bank that includes the No. 1 cylinder*.
    • *: The No. 1 cylinder is the cylinder which is farthest from the transmission.
  • Sensor 1 refers to the sensor closest to the engine assembly.
  • When any air-fuel ratio imbalance is detected, the ECM will perform air-fuel ratio feedback control to make the air-fuel ratio close to the stoichiometric level. This may result in an air-fuel ratio imbalance of normal cylinders and DTCs may be stored.

PROCEDURE

1.

CHECK FOR ANY OTHER DTCS OUTPUT

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

(e) Read the DTCs.

Result

Result

Proceed to

DTC P219A, P219B, P219C, P219D, P219E, P219F, P21A0, P21A1, P21A2 and/or P21A3 are output

A

DTC P219A, P219B, P219C, P219D, P219E, P219F, P21A0, P21A1, P21A2 and/or P21A3 and other DTCs are output

B

HINT:

If any DTCs other than P219A, P219B, P219C, P219D, P219E, P219F, P21A0, P21A1, P21A2 and/or P21A3 are output, troubleshoot those DTCs first.

B

GO TO DTC CHART

A

2.

READ VALUE USING TECHSTREAM (FREEZE FRAME DATA)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Using the Techstream, confirm the vehicle conditions recorded in the freeze frame data which were present when the DTC was stored (See page ).

Freeze Frame Data Items for DTC P219A, P219B, P219C, P219D, P219E, P219F, P21A0, P21A1, P21A2, P21A3
  • Vehicle Speed
  • Engine Speed
  • Calculate Load
  • Accelerator Idle Position
  • Short FT B1S1, B2S1
  • Long FT B1S1, B2S1
  • Cylinder #1 Misfire Count to Cylinder #8 Misfire Count

HINT:

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

Air Fuel Ratio Sensor Monitoring Method (P219A and P219B)

Crankshaft Position Sensor Monitoring Method (P219C, P219D, P219E, P219F, P21A0, P21A1, P21A2 and P21A3)

Note

DTCs are output

DTC is output (Only one DTC relating to a single cylinder is output)

Malfunction of cylinders detected by the Crankshaft Position Sensor Monitoring Method is primarily suspected.

DTCs are output

DTCs are output (Multiple DTCs relating to multiple cylinders are output)

Malfunction of cylinders except ones detected by the Crankshaft Position Sensor Monitoring Method is primarily suspected.*1

DTCs are not output

DTCs are output

Malfunction of cylinders detected by the Crankshaft Position Sensor Monitoring Method is primarily suspected.

DTCs are output

DTCs are not output

Malfunctioning of the bank detected by the Air Fuel Ratio Sensor Monitoring Method is primarily suspected.

*1: When any air-fuel ratio imbalance is detected, the ECM will perform air-fuel ratio feedback control to make the air-fuel ratio close to the stoichiometric level. This may result in an air-fuel ratio imbalance of normal cylinders and DTCs may be stored.

NEXT

3.

READ VALUE USING DTC OUTPUT

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

HINT:

  • If any misfire count ("Cylinder #1 Misfire Count" to "Cylinder #8 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.

(e) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

Result

Result

Proceed to

P219A or P219B is output

A

P219A or P219B, and P219C, P219D, P219E, P219F, P21A0, P21A1, P21A2 or P21A3 is are output

B

DTC P219C, P219D, P219E, P219F, P21A0, P21A1, P21A2 and/or P21A3 are output

B

GO TO STEP 6

A

4.

PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE INJECTION VOLUME)

(a) Connect the Techstream to the DLC3.

(b) Start the engine.

(c) Turn the Techstream on.

(d) Warm up the engine.

HINT:

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

(e) Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection Volume / Data List / Cylinder #1 to #8 Misfire Count.

HINT:

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).

(f) Perform the Control the Injection Volume operation with the engine idling.

(g) Check the misfire counts ("Cylinder #1 Misfire Count" to "Cylinder #8 Misfire Count") while decreasing the injection volume in 5% increments.

NOTICE:

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

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

(a) Check for exhaust gas leaks.

OK:

No gas leaks.

HINT:

Perform "Inspection After Repair" after repairing or replacing the exhaust system (See page ).

NG

REPAIR OR REPLACE EXHAUST SYSTEM

OK

6.

CHECK INTAKE SYSTEM

(a) Check the intake system for vacuum leakage (See page ).

OK:

No leakage in intake system.

HINT:

Perform "Inspection After Repair" after repairing or replacing the intake system (See page ).

NG

REPAIR OR REPLACE INTAKE SYSTEM

OK

7.

INSPECT SPARK PLUG

(a) Inspect the spark plug of the cylinder causing the imbalance (See page ).

HINT:

Perform "Inspection After Repair" after replacing the spark plug (See page ).

NG

REPLACE SPARK PLUG

OK

8.

CHECK FOR SPARKS AND IGNITION

(a) Perform a spark test (See page ).

HINT:

  • If the result of the spark test is normal, proceed to the next step.
  • Perform "Inspection After Repair" after replacing the spark plug or ignition coil assembly (See page ).
NEXT

9.

CHECK CYLINDER COMPRESSION PRESSURE

(a) Measure the cylinder compression pressure of the misfiring cylinder (See page ).

HINT:

Perform "Inspection After Repair" after repairing or replacing the engine assembly (See page ).

NG

CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION

OK

10.

CHECK FUEL INJECTOR ASSEMBLY OF CYLINDER CAUSING IMBALANCE

(a) Check the fuel injector injection [whether fuel volume is high or low, and whether injection pattern is poor] (See page ).

HINT:

Perform "Inspection After Repair" after replacing the fuel injector assembly (See page ).

NG

REPLACE FUEL INJECTOR ASSEMBLY

OK

11.

CHECK FOR CAUSE OF FAILURE

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

(b) Check the intake valve for deposits.

HINT:

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

NEXT

12.

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Clear the DTCs (See page ).

(e) Turn the ignition switch off and wait for at least 30 seconds.

(f) Turn the ignition switch to ON.

(g) Turn the Techstream on.

(h) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.

(i) Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

(j) Check for DTCs.

P219A, P219B, P219C, P219D, P219E, P219F, P21A0, P21A1, P21A2 and/or P21A3 is not output.

NEXT

END

    System Too Lean (Bank 1) (P0171,P0172,P0174,P0175)

    Random / Multiple Cylinder Misfire Detected (P0300-P0308)

    See More:

    Toyota Tundra Service Manual > Sfi System: Definition Of Terms
    DEFINITION OF TERMS Term Definition Monitor Description Description of what ECM monitors and how it detects malfunctions (monitoring purpose and details). Related DTCs Group of diagnostic trouble codes output by ECM based on same malfunction detection logic. Typical Enabling Conditions Preconditions ...

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