SFI SYSTEM(w/ Canister Pump Module), Diagnostic DTC:P219A, P219C, P219D, P219E, P219F

DTC Code	DTC Name
P219A	Bank 1 Air-Fuel Ratio Imbalance
P219C	Cylinder 1 Air-Fuel Ratio Imbalance
P219D	Cylinder 2 Air-Fuel Ratio Imbalance
P219E	Cylinder 3 Air-Fuel Ratio Imbalance
P219F	Cylinder 4 Air-Fuel Ratio Imbalance

DESCRIPTION

Refer to DTC P0300.

Click here

Refer to DTC P2195.

Click here

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
P219C	Cylinder 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
P219D	Cylinder 2 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
P219E	Cylinder 3 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
P219F	Cylinder 4 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 there is a malfunction, illuminates the MIL 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 air fuel ratios between the cylinders due to fluctuation in the air fuel ratio sensor output over 1 engine cycle (2 crankshaft revolutions), the ECM determines that there is a malfunction.

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 ECM determines that there is a difference in air fuel ratios between the cylinders, which it determines to be a malfunction.

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

TYPICAL ENABLING CONDITIONS

P219A: Air Fuel Ratio Sensor Monitoring Method
Air fuel ratio sensor status	Activated
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.

P219C, P219D, P219E, P219F: 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
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)	0.1277 or more

P219C, P219D, P219E, P219F: 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, P219C, P219D, P219E or P219F.

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.
If the judgment result shows INCOMPLETE, perform the confirmation driving pattern and check the judgment result again.

CAUTION / NOTICE / HINT

Tech Tips

Sensor 1 refers to the sensor closest to the engine assembly.
Sensor 2 refers to the sensor farthest away from 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.
Read freeze frame data using the GTS. 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.

PROCEDURE

CHECK ANY OTHER DTCS OUTPUT

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

Tech Tips

If any DTCs other than DTC P219A, P219C, P219D, P219E and/or P219F 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 and turn the GTS 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, P219C, P219D, P219E or P219F

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 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.

Result

Proceed to
NEXT

READ DTC OUTPUT

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 / Trouble Codes.

Read the DTCs.

Powertrain > Engine and ECT > Trouble Codes

Result

Result	Proceed to
DTC 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 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 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 leaks in the 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 replacing the spark plug or ignition coil assembly.

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 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

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.

Click here

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
DTCs are not output.

Result

Proceed to
NEXT

END