Toyota Venza: Bank 1 Air-Fuel Ratio Imbalance (P219A,P219C-P219F)

Toyota Venza Service Manual / 1ar-fe Engine Control / Sfi System / Bank 1 Air-Fuel Ratio Imbalance (P219A,P219C-P219F)

DESCRIPTION

Refer to DTC P0300 (See page ).

Refer to DTC P2195 (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 (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 (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 (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 (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 (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 volume 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 is stored primarily when a rich side imbalance is detected.

When the system detects a difference in the 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 and/or P219F 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 the 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) 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)
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 seconds: P219A 30 seconds: Others
MIL Operation	2 driving cycles
Sequence of Operation	None

TYPICAL ENABLING CONDITIONS

P219A

Monitor runs whenever the following DTCs are not stored

P0010 (VVT oil control valve)

P0011 (VVT system - advance)

P0012 (VVT system - retard)

P0013 (Exhaust VVT oil control valve)

P0014 (Exhaust VVT system - advance)

P0015 (Exhaust VVT system - retard)

P0016 (VVT system - misalignment)

P0017 (Exhaust VVT system - misalignment)

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

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 (Camshaft position sensor)

P0351 - P0354 (Igniter)

P0365, P0367, P0368 (Exhaust camshaft position sensor)

P0500 (Vehicle speed sensor)

Other

Monitor runs whenever following DTCs are not present

None

P219A: Air Fuel Ratio Sensor Monitoring Method

Air fuel ratio sensor status	Activated
Engine speed	1500 rpm or higher, and less than 2300 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	27.5 gm/sec or more, and less than 40 gm/sec

P219C, P219D, P219E, P219F: Crankshaft Position Sensor Monitoring Method

Vehicle speed	Less than 3 km/h (1.875 mph)
Engine speed	500 rpm or higher, and less than 1000 rpm
Engine coolant temperature	75°C (167°F) or higher
Air fuel ratio sensor status	Activated
Fuel system status	Closed loop
Battery voltage	11 V or higher

TYPICAL MALFUNCTION THRESHOLDS

P219A: Air Fuel Ratio Sensor Monitoring Method

Air fuel ratio sensor monitoring method criteria (rich side imbalance)

0.135 or more

P219C, P219D, P219E and P219F: Crankshaft Position Sensor Monitoring Method

Crankshaft position sensor monitoring method criteria (lean side imbalance)

1 or more

MONITOR RESULT

Refer to Checking Monitor Status (See page
).

CONFIRMATION DRIVING PATTERN

Connect the Techstream to the DLC3.
Turn the ignition switch to ON.
Turn the Techstream on.
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.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Drive the vehicle at 60 km/h (37 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.
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.
Enter the following menus: Powertrain / Engine / Trouble Codes [D].
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.
Drive the vehicle at less than 30 km/h (19 mph) for 5 seconds or more [E].
CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.
Accelerate the vehicle from 30 to 60 km/h (19 to 37 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 37 mph).
Drive the vehicle at 60 km/h (37 mph) or more for 5 seconds or more [F].
CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.
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.
Accelerate the vehicle from 30 to 60 km/h (19 to 37 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 37 mph).
Drive the vehicle at 60 km/h (37 mph) or more for 5 seconds or more [H].
CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.
Repeat steps [G] and [H] above at least 2 times [I].
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.
Enter the following menus: Powertrain / Engine / Trouble Codes [K].
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.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P219A, P219C, P219D, P219E or P219F.

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.

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.

WIRING DIAGRAM

Refer to Fuel Injector Circuit (See page ).

CAUTION / NOTICE / HINT

HINT:

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.
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.
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

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

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

(e) Read DTCs.

Result

Result	Proceed to
DTC P219A, P219C, P219D, P219E and/or P219F is output	A
DTC P219A, P219C, P219D, P219E and/or P219F and other DTCs are output	B

HINT:

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

GO TO DTC CHART

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 Item for DTC P219A, P219C, P219D, P219E and/or P219F:

Vehicle Speed
Engine Speed
Calculate Load
Accelerator Idle Position
Short FT #1, #2
Long FT #1, #2
Cylinder #1 Misfire Count to Cylinder #4 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)	Crankshaft Position Sensor Monitoring Method (P219C, P219D, P219E and P219F)	Note
DTCs are output	DTC is output (Only one DTC relating to a single cylinder is output)	Malfunctioning of cylinders detected by Crankshaft Position Sensor Monitoring Method is primarily suspected
DTCs are output	DTCs are output (Multiple DTCs relating to multiple cylinders are output)	Malfunctioning of cylinders except ones detected by Crankshaft Position Sensor Monitoring Method is primarily suspected.*
DTCs are not output	DTCs are output	Malfunctioning of cylinders detected by Crankshaft Position Sensor Monitoring Method is primarily suspected.
DTCs are output	DTCs are not output	Malfunctioning of the bank detected by Air Fuel Ratio Sensor Monitoring Method is primarily suspected

*: 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.

3.	READ DTC OUTPUT

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to 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 #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.

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

(f) Read the DTCs.

Result

Result	Proceed to
P219A is output	A
DTC P219A, and P219C, P219D, P219E or P219F is output	B
DTC P219C, P219D, P219E and/or P219F is output	B

GO TO STEP 6

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

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to 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 / Active Test / Control the Injection Volume / Data List / Cylinder #1 to #4 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 #4 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.

5.	CHECK FOR EXHAUST GAS LEAK

(a) Check for exhaust gas leaks.

OK:

No exhaust gas leaks.

HINT:

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

REPAIR OR REPLACE EXHAUST SYSTEM

6.	CHECK INTAKE SYSTEM

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

OK:

No leaks in intake system.

HINT:

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

REPAIR OR REPLACE INTAKE SYSTEM

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 ).

REPLACE SPARK PLUG

8.	CHECK FOR SPARK (SPARK TEST)

(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 repairing or replacing the ignition system (See page ).

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 ).

CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION

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

GO TO FUEL INJECTOR CIRCUIT

11.	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 ).

REPLACE FUEL INJECTOR ASSEMBLY

12.	CHECK FOR CAUSE OF FAILURE

(a) If the case 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 remove the cylinder head and check the intake valve.

13.	CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Clear the DTCs.

(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 / Trouble Codes.

(j) Check for DTCs.

DTCs are not output.

END

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