SFI SYSTEM(w/ Canister Pump Module), Diagnostic DTC:P219A

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

DESCRIPTION

Refer to DTC P0300.

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Refer to DTC P2195.

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DTC No.	Detection Item	DTC Detection Condition	Trouble Area	MIL	Memory
P219A	Bank 1 Air-Fuel Ratio Imbalance	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	Comes on	DTC stored

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

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: Air fuel ratio sensor monitoring method 30 seconds: Crankshaft position sensor monitoring method

TYPICAL ENABLING CONDITIONS

Air Fuel Ratio Sensor Monitoring Method
Engine speed	1600 rpm or higher, and less than 2400 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	24 gm/sec or more, and less than 34 gm/sec

Crankshaft Position Sensor Monitoring Method
Vehicle speed	Less than 3 km/h (1.875 mph)
Engine speed	450 rpm or higher, and less than 1100 rpm
Engine coolant temperature	75°C (167°F) or higher
Fuel system status	Closed loop
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)	0.133 or more

Crankshaft Position Sensor Monitoring Method
Crankshaft position sensor monitoring method criteria (lean side imbalance)	1.0 or more

CONFIRMATION DRIVING PATTERN

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

Tech Tips

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.

Tech Tips

It is acceptable to turn electrical loads on while driving.
Idle the engine for 2 minutes or more [C].

Tech Tips

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 and ECT / Trouble Codes [D].
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.
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.

Tech Tips

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.

Tech Tips

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].

Tech Tips

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 and ECT / Trouble Codes [K].
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.
Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
Input the DTC: P219A.

Check the DTC judgment result.

GTS 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.

CAUTION / NOTICE / HINT

Tech Tips

Read freeze frame data using the GTS. 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.

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Sensor 1 refers to the sensor closest to the engine assembly.
Sensor 2 refers to the sensor farthest away from the engine assembly.

PROCEDURE

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

Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

Read the DTCs.

Powertrain > Engine and ECT > Trouble Codes

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.

GO TO DTC CHART Click here

READ VALUE USING GTS (FREEZE FRAME DATA)

Connect the GTS to the DLC3.
Turn the ignition switch to ON.

Using the GTS, 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
Accelerator Idle Position
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.

DTC stored during idling	It is possible to conclude that the problem was detected due to a "lean imbalance" (detected using crankshaft speed variation).
DTC stored while vehicle being driven	It is possible to conclude that the problem was detected due to a "rich imbalance" (detected using the air fuel ratio sensor).

Result

Proceed to
NEXT

READ VALUE USING GTS (MONITOR RESULT)

Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
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.
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.

Powertrain > Engine and ECT > Monitor

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.

CHECK INTAKE SYSTEM Click here

PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION VOLUME)

Connect the GTS to the DLC3.
Start the engine.
Turn the GTS on.
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.

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

Powertrain > Engine and ECT > Active Test

Active Test Display
Control the Injection Volume

Data List Display
Cylinder #1 Misfire Count
Cylinder #2 Misfire Count
Cylinder #3 Misfire Count
Cylinder #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).

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

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

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

Result

Proceed to
NEXT

CHECK FOR EXHAUST GAS LEAK

Check for exhaust gas leaks.

OK
No gas leaks.

Tech Tips

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

Click here

Result

Proceed to
OK
NG

REPAIR OR REPLACE EXHAUST SYSTEM

CHECK INTAKE SYSTEM

Check the intake system for vacuum leaks.

Click here

OK
No leakage in intake system.

Tech Tips

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

Click here

Result

Proceed to
OK
NG

REPAIR OR REPLACE INTAKE SYSTEM

INSPECT SPARK PLUG

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

Result

Proceed to
OK
NG

REPLACE SPARK PLUG Click here

CHECK FOR SPARK (SPARK TEST)

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

Result

Proceed to
NEXT

CHECK CYLINDER COMPRESSION PRESSURE

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

Result

Proceed to
OK
NG

CHECK ENGINE TO DETERMINE CAUSE OF LOW COMPRESSION

CHECK TERMINAL VOLTAGE (POWER SOURCE OF FUEL INJECTOR ASSEMBLY)

Result

Proceed to
OK
NG

*a
Front view of wire harness connector

(to Fuel Injector Assembly)

Disconnect the fuel injector assembly connectors.
Turn the ignition switch to ON.

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

Standard Voltage

Tester Connection	Switch Condition	Specified Condition
B19-1 - Body ground	Ignition switch ON	11 to 14 V
B17-1 - Body ground	Ignition switch ON	11 to 14 V
B15-1 - Body ground	Ignition switch ON	11 to 14 V
B13-1 - Body ground	Ignition switch ON	11 to 14 V

Result

Proceed to
OK
NG

CHECK FUEL INJECTOR CIRCUIT Click here

CHECK FUEL INJECTOR ASSEMBLY OF CYLINDER CAUSING IMBALANCE

Check the fuel injector 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

Result

Proceed to
OK
NG

REPLACE FUEL INJECTOR ASSEMBLY Click here

CHECK FOR CAUSE OF FAILURE

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

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 and check the intake valve.

Result

Proceed to
NEXT

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Clear the DTCs.

Powertrain > Engine and ECT > Clear DTCs
Turn the ignition switch off and wait for at least 30 seconds.
Turn the ignition switch to ON.
Turn the GTS on.
Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes.

Check for DTCs.

Powertrain > Engine and ECT > Trouble Codes

Result
P219A is not output.

Result

Proceed to
NEXT

END