RM35X0E _51 Engine / Hybrid System _078720 7GR-FKS ENGINE CONTROL _0381907 SFI SYSTEM C

7GR-FKS ENGINE CONTROL  SFI SYSTEM  P2A0026  O2 Sensor Circuit Range/Performance Bank 1 Sensor 1 Signal Rate of Change Below Threshold  P2A0326  O2 Sensor Circuit Range/Performance Bank 2 Sensor 1 Signal Rate of Change Below Threshold  


DESCRIPTION

Refer to DTC P219519.

Click hereEngine / Hybrid System>7GR-FKS (ENGINE CONTROL)>SFI SYSTEM>P219519

HINT:

Although the DTC titles say oxygen sensor, these DTCs relate to the air fuel ratio sensor.


DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P2A0026 O2 Sensor Circuit Range/Performance Bank 1 Sensor 1 Signal Rate of Change Below Threshold The calculated value for the air fuel ratio sensor response rate deterioration level is less than the threshold (2 trip detection logic).
·

Air fuel ratio sensor (bank 1 sensor 1)

·

Intake system

·

Fuel injector assembly (for port injection)

·

Fuel injector assembly (for direct injection)

·

Fuel pressure (for low pressure side)

·

Fuel pressure (for high pressure side)

·

Fuel system

·

ECM


Comes on DTC stored SAE Code: P2A00
P2A0326 O2 Sensor Circuit Range/Performance Bank 2 Sensor 1 Signal Rate of Change Below Threshold The calculated value for the air fuel ratio sensor response rate deterioration level is less than the threshold (2 trip detection logic).
·

Air fuel ratio sensor (bank 2 sensor 1)

·

Intake system

·

Fuel injector assembly (for port injection)

·

Fuel injector assembly (for direct injection)

·

Fuel pressure (for low pressure side)

·

Fuel pressure (for high pressure side)

·

Fuel system

·

ECM


Comes on DTC stored SAE Code: P2A03

MONITOR DESCRIPTION

After the engine is warmed up, the ECM performs air fuel ratio feedback control to maintain the air fuel ratio at the stoichiometric level. In addition, active air fuel ratio control is performed for approximately 30 seconds after preconditions are met in order to measure the air fuel ratio sensor response rate. During active air fuel ratio control, the ECM forcibly increases and decreases the injection volume by a certain amount, based on the stoichiometric air fuel ratio learned during normal air fuel ratio control, and measures the air fuel ratio sensor response rate. The ECM receives a signal from the air fuel ratio sensor while performing active air fuel ratio control and uses it to calculate the air fuel ratio sensor response rate deterioration level.

If the value for the air fuel ratio sensor response rate deterioration level is less than the threshold, the ECM interprets this as a malfunction and stores a DTC.

A115363E55
4.271,1.469 4.115,1.167 false 5.219,1.615 5.438,1.052 false 0.063,0.042 1.917,0.25 1.854,0.208 10 Air Fuel Ratio Sensor Output: 0.073,0.76 1.833,1 1.76,0.24 10 Active Air Fuel Ratio Control 0.073,1.75 1.917,2 1.844,0.25 10 Air Fuel Ratio Sensor Output 3.635,1.042 4.167,1.25 0.531,0.208 10 Normal 5.479,0.958 6.25,1.167 0.771,0.208 10 Malfunction 3.896,0.25 6.125,0.521 2.229,0.271 10 Approximately 30 seconds or more 0.073,2.719 1.5,3 1.427,0.281 10 Fuel Injection Volume 2.865,2.531 3.5,2.75 0.635,0.219 10 Increase 2.865,2.875 3.5,3.083 0.635,0.208 10 Decrease 1.875,0.552 2.167,0.75 0.292,0.198 10 ON 1.875,0.854 2.25,1.083 0.375,0.229 10 OFF

MONITOR STRATEGY

Required Sensors/Components Air fuel ratio sensor
Frequency of Operation Once per driving cycle

TYPICAL ENABLING CONDITIONS

Active air fuel ratio control Performing
Active air fuel ratio control performed when following conditions met -
Engine coolant temperature 75°C (167°F) or higher
Idling Off
Engine speed Less than 3000 rpm
Air fuel ratio sensor status Activated
Engine load 10% or higher, and less than 70%
Catalyst monitor Not executing
Mass air flow 3.5 gm/sec or more, and less than 18 gm/sec

CONFIRMATION DRIVING PATTERN

HINT:

Performing this confirmation driving pattern will activate the air fuel ratio sensor response monitor.


A295461E63
1.313,0.875 1.583,0.5 1.583,0.5 1.75,0.5 false 0.333,0.167 1.281,0.365 0.948,0.198 10 false Vehicle Speed 1.802,0.417 3.458,0.604 1.656,0.188 10 false Between 75 and 100 km/h 0.75,1.156 1.281,1.333 0.531,0.177 10 false 60 km/h 0.927,2.188 1.313,2.365 0.385,0.177 10 false Idling 0.125,2.427 1.5,2.896 1.375,0.469 10 false Ignition Switch ON 1.781,2.698 2.573,2.885 0.792,0.188 10 false Warming up 2.969,2.729 4.198,2.917 1.229,0.188 10 false 10 minutes or more 5.531,2.729 6.76,2.917 1.229,0.188 10 false 10 minutes or more 2.042,2.115 2.271,2.292 0.229,0.177 10 false [A] 3.458,1.271 3.688,1.448 0.229,0.177 10 false [B] 4.375,3.135 4.604,3.313 0.229,0.177 10 false [C] 6.01,0.896 6.24,1.073 0.229,0.177 10 false [D] 6.75,3.135 6.979,3.313 0.229,0.177 10 false [E]

1.

Connect the GTS to the DLC3.

2.

Turn the ignition switch to ON.

3.

Turn the GTS on.

4.

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

5.

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

6.

Turn the ignition switch to ON.

7.

Turn the GTS on.

8.

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

9.

Drive the vehicle at a speed of approximately 60 km/h (37 mph) for 10 minutes or more in a city area [B].

CAUTION:

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


10.

Enter the following menus: Powertrain / Engine / Trouble Codes [C].

11.

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.



12.

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

13.

Input the DTC: P2A0026 or P2A0326.

14.

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



HINT:
·

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

·

If the judgment result is ABNORMAL, the system has a malfunction.

·

If the judgment result is INCOMPLETE and no pending DTC is output, perform the following procedure.



15.

Drive the vehicle at a speed between 75 and 100 km/h (47 and 62 mph) for 10 minutes [D].

CAUTION:

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


16.

Enter the following menus: Powertrain / Engine / Trouble Codes [E].

17.

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.



18.

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

19.

Input the DTC: P2A0026 or P2A0326.

20.

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



HINT:
·

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

·

If the judgment result is ABNORMAL, the system has a malfunction.

·

If the judgment result is INCOMPLETE, drive the vehicle again under an increased load and then recheck the judgment result.




CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.


HINT:
·

DTC P2A0026 or P2A0326 may be also stored when the air fuel ratio is stuck at rich or lean.

·

A low air fuel ratio sensor voltage could be caused by a rich air fuel mixture. Check for conditions that would cause the engine to run rich.

·

A high air fuel ratio sensor voltage could be caused by a lean air fuel mixture. Check for conditions that would cause the engine to run lean.

·

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.

·

Bank 2 refers to the bank that does not include the No. 1 cylinder.

·

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

·

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

·

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

1.CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P2A0026 OR P2A0326)
a.

Connect the GTS to the DLC3.


b.

Turn the ignition switch to ON.


c.

Turn the GTS on.


d.

Enter the following menus: Powertrain / Engine / Trouble Codes.


e.

Read the DTCs.

Powertrain > Engine > Trouble Codes
50001 372
Result:
Result Proceed to
DTC P2A0026 or P2A0326 is output A
DTC P2A0026 or P2A0326 and other DTCs are output B


HINT:

If any DTCs other than P2A0026 or P2A0326 are output, troubleshoot those DTCs first.




A

2.PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION VOLUME FOR A/F SENSOR)

B

GO TO DTC CHART

Click hereEngine / Hybrid System>7GR-FKS (ENGINE CONTROL)>SFI SYSTEM>DIAGNOSTIC TROUBLE CODE CHART


2.PERFORM ACTIVE TEST USING GTS (CONTROL THE INJECTION VOLUME FOR A/F SENSOR)
a.

Connect the GTS to the DLC3.


b.

Turn the ignition switch to ON.


c.

Turn the GTS on.


d.

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


e.

Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor / Data List / Coolant Temperature / A/F (O2) Sensor Voltage B1S1 and O2 Sensor Voltage B1S2 or A/F (O2) Sensor Voltage B2S1 and O2 Sensor Voltage B2S2.

Powertrain > Engine > Active Test
Active Test Display
Control the Injection Volume for A/F Sensor
Data List Display
A/F (O2) Sensor Voltage B1S1
A/F (O2) Sensor Voltage B2S1
O2 Sensor Voltage B1S2
O2 Sensor Voltage B2S2
Coolant Temperature
50004 372 8 225,512,218,510,205

f.

Perform the Control the Injection Volume for A/F Sensor operation with the engine idling.


g.

Monitor the voltage outputs of the air fuel ratio sensor and the heated oxygen sensor (A/F (O2) Sensor Voltage B1S1 and O2 Sensor Voltage B1S2 or A/F (O2) Sensor Voltage B2S1 and O2 Sensor Voltage B2S2) displayed on the GTS.

HINT:
·

The Control the Injection Volume for A/F Sensor operation lowers the fuel injection volume by 12.5% or increases the injection volume by 12.5%.

·

The air fuel ratio sensor has an output delay of a few seconds and the heated oxygen sensor has a maximum output delay of approximately 20 seconds.

·

If the sensor output voltage does not change (almost no reaction) while performing the Active Test, the sensor may be malfunctioning.



Standard:
GTS Display (Sensor) Injection Volume Status Voltage
A/F (O2) Sensor Voltage B1S1
A/F (O2) Sensor Voltage B2S1
(Air fuel ratio) 		12.5% Rich Below 3.1 V
-12.5% Lean Higher than 3.4 V
O2 Sensor Voltage B1S2
O2 Sensor Voltage B2S2
(Heated oxygen) 		12.5% Rich Higher than 0.55 V
-12.5% Lean Below 0.4 V


Result:
Status of A/F (O2) Sensor Voltage B1S1 or A/F (O2) Sensor Voltage B2S1 Status of O2 Sensor Voltage B1S2 or O2 Sensor Voltage B2S2 Air Fuel Ratio Condition and Air Fuel Ratio Sensor Condition Proceed to
Lean/Rich Lean/Rich Normal A
Lean Lean Actual air fuel ratio lean B
Rich Rich Actual air fuel ratio rich
Lean Lean/Rich Air fuel ratio sensor malfunction C
Rich Lean/Rich Air fuel ratio sensor malfunction


Lean: During Control the Injection Volume for A/F Sensor of the Active Test, the air fuel ratio sensor output voltage (A/F (O2) Sensor Voltage B1S1 or A/F (O2) Sensor Voltage B2S1) is consistently higher than 3.4 V, and the heated oxygen sensor output voltage (O2 Sensor Voltage B1S2 or O2 Sensor Voltage B2S2) is consistently below 0.4 V.

Rich: During Control the Injection Volume for A/F Sensor of the Active Test, the A/F (O2) Sensor Voltage B1S1 or A/F (O2) Sensor Voltage B2S1 is consistently below 3.1 V, and the O2 Sensor Voltage B1S2 or O2 Sensor Voltage B2S2 is consistently higher than 0.55 V.

Lean/Rich: During Control the Injection Volume for A/F Sensor of the Active Test, the output voltage of the air fuel ratio sensor or heated oxygen sensor alternates correctly.

HINT:

Refer to "Data List / Active Test" [A/F (O2) Sensor Voltage B1S1, O2 Sensor Voltage B1S2, A/F (O2) Sensor Voltage B2S1 and O2 Sensor Voltage B2S2].

Click hereEngine / Hybrid System>7GR-FKS (ENGINE CONTROL)>SFI SYSTEM>DATA LIST / ACTIVE TEST





A

3.CLEAR DTC

B

5.INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)

C

13.REPLACE AIR FUEL RATIO SENSOR
3.CLEAR DTC
a.

Connect the GTS to the DLC3.


b.

Turn the ignition switch to ON.


c.

Turn the GTS on.


d.

Clear the DTC.

Powertrain > Engine > Clear DTCs
50002 372

e.

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


Result:
Proceed to
NEXT



NEXT

4.CHECK WHETHER DTC OUTPUT RECURS (DTC P2A0026 OR P2A0326)
4.CHECK WHETHER DTC OUTPUT RECURS (DTC P2A0026 OR P2A0326)
a.

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


b.

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

Powertrain > Engine > Utility
Tester Display
All Readiness
50005 372 20

c.

Input the DTC: P2A0026 or P2A0326.


d.

Check the DTC judgment result.

Result:
Result Proceed to
NORMAL
(DTCs are not output) 		A
ABNORMAL
(DTC P2A0026 or P2A0326 is output) 		B




A

CHECK FOR INTERMITTENT PROBLEMS

Click hereEngine / Hybrid System>7GR-FKS (ENGINE CONTROL)>SFI SYSTEM>CHECK FOR INTERMITTENT PROBLEMS


B

13.REPLACE AIR FUEL RATIO SENSOR
5.INSPECT AIR FUEL RATIO SENSOR (HEATER RESISTANCE)
a.

Inspect the air fuel ratio sensor.

Click hereEngine / Hybrid System>7GR-FKS (ENGINE CONTROL)>AIR FUEL RATIO SENSOR>INSPECTION

HINT:

Perform "Inspection After Repair" after replacing the air fuel ratio sensor.

Click hereEngine / Hybrid System>7GR-FKS (ENGINE CONTROL)>SFI SYSTEM>INITIALIZATION



Result:
Proceed to
OK
NG



OK

6.CHECK INTAKE SYSTEM

NG

REPLACE AIR FUEL RATIO SENSOR

Click hereEngine / Hybrid System>7GR-FKS (ENGINE CONTROL)>AIR FUEL RATIO SENSOR>REMOVAL


6.CHECK INTAKE SYSTEM
a.

Check the intake system for vacuum leaks.

Click hereEngine / Hybrid System>7GR-FKS (INTAKE / EXHAUST)>INTAKE SYSTEM>ON-VEHICLE INSPECTION

OK:

No leaks in the intake system.


HINT:

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

Click hereEngine / Hybrid System>7GR-FKS (ENGINE CONTROL)>SFI SYSTEM>INITIALIZATION



Result:
Proceed to
OK
NG



OK

7.CHECK FOR EXHAUST GAS LEAK

NG

REPAIR OR REPLACE INTAKE SYSTEM

7.CHECK FOR EXHAUST GAS LEAK
a.

Check for exhaust gas leaks.

OK:

No gas leaks in exhaust system.


HINT:

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

Click hereEngine / Hybrid System>7GR-FKS (ENGINE CONTROL)>SFI SYSTEM>INITIALIZATION



Result:
Proceed to
OK
NG



OK

8.CHECK FUEL PRESSURE (FOR LOW PRESSURE SIDE)

NG

REPAIR OR REPLACE EXHAUST SYSTEM

8.CHECK FUEL PRESSURE (FOR LOW PRESSURE SIDE)
a.

Check the fuel pressure (for low pressure side).

Click hereEngine / Hybrid System>7GR-FKS (FUEL)>FUEL SYSTEM>ON-VEHICLE INSPECTION


Result:
Proceed to
OK
NG



OK

9.INSPECT FUEL INJECTOR ASSEMBLY (FOR PORT INJECTION)

NG

12.CHECK FUEL LINE
9.INSPECT FUEL INJECTOR ASSEMBLY (FOR PORT INJECTION)
a.

Inspect the fuel injector assembly (for port injection) (whether fuel volume is high or low, and whether injection pattern is poor).

Click hereEngine / Hybrid System>7GR-FKS (FUEL)>FUEL INJECTOR (for Port Injection)>INSPECTION

HINT:

Perform "Inspection After Repair" after replacing the fuel injector assembly (for port injection).

Click hereEngine / Hybrid System>7GR-FKS (ENGINE CONTROL)>SFI SYSTEM>INITIALIZATION



Result:
Proceed to
OK
NG



OK

10.READ VALUE USING GTS (FUEL PRESSURE (HIGH))

NG

REPLACE FUEL INJECTOR ASSEMBLY (FOR PORT INJECTION)

Click hereEngine / Hybrid System>7GR-FKS (FUEL)>FUEL INJECTOR (for Port Injection)>REMOVAL


10.READ VALUE USING GTS (FUEL PRESSURE (HIGH))
a.

Connect the GTS to the DLC3.


b.

Start the engine.


c.

Turn the GTS on.


d.

Enter the following menus: Powertrain / Engine / Data List / Engine Speed, Coolant Temperature, Fuel Pressure (High) and Injection Mode.

Powertrain > Engine > Data List
Tester Display
Engine Speed
Coolant Temperature
Fuel Pressure (High)
Injection Mode
50003 372 211,205,265,294

e.

Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with all the accessories switched off.


f.

According to the display on the GTS, read the Data List.

Standard:
GTS Display Condition Specified Condition
Fuel Pressure (High)
·

Shift position: P or neutral

·

A/C: Off

·

Engine warmed up

·

Engine Speed: 3000 rpm

·

Injection Mode: Direct


2400 to 20000 kPag



Result:
Proceed to
OK
NG



OK

11.INSPECT FUEL INJECTOR ASSEMBLY (FOR DIRECT INJECTION)

NG

REPAIR OR REPLACE FUEL SYSTEM (FOR HIGH PRESSURE SIDE)

11.INSPECT FUEL INJECTOR ASSEMBLY (FOR DIRECT INJECTION)
a.

Inspect the fuel injector assembly (for direct injection).

Click hereEngine / Hybrid System>7GR-FKS (FUEL)>FUEL INJECTOR (for Direct Injection)>INSPECTION

HINT:

Perform "Inspection After Repair" after replacing the fuel injector assembly (for direct injection).

Click hereEngine / Hybrid System>7GR-FKS (ENGINE CONTROL)>SFI SYSTEM>INITIALIZATION



Result:
Proceed to
OK
NG



OK

13.REPLACE AIR FUEL RATIO SENSOR

NG

REPLACE DIRECT FUEL INJECTOR ASSEMBLY (FOR DIRECT INJECTION)

Click hereEngine / Hybrid System>7GR-FKS (FUEL)>FUEL INJECTOR (for Direct Injection)>REMOVAL


12.CHECK FUEL LINE
a.

Check the fuel lines for leaks or blockage.


Result:
Proceed to
OK
NG



OK

GO TO FUEL PUMP CONTROL CIRCUIT

Click hereEngine / Hybrid System>7GR-FKS (ENGINE CONTROL)>SFI SYSTEM>Fuel Pump Control Circuit


NG

REPAIR OR REPLACE FUEL SYSTEM

13.REPLACE AIR FUEL RATIO SENSOR
a.

Replace the air fuel ratio sensor.

Click hereEngine / Hybrid System>7GR-FKS (ENGINE CONTROL)>AIR FUEL RATIO SENSOR>REMOVAL

HINT:

Perform "Inspection After Repair" after replacing the air fuel ratio sensor.

Click hereEngine / Hybrid System>7GR-FKS (ENGINE CONTROL)>SFI SYSTEM>INITIALIZATION



Result:
Proceed to
NEXT



NEXT

14.CLEAR DTC
14.CLEAR DTC
a.

Connect the GTS to the DLC3.


b.

Turn the ignition switch to ON.


c.

Turn the GTS on.


d.

Clear the DTC.

Powertrain > Engine > Clear DTCs
50002 372

e.

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


Result:
Proceed to
NEXT



NEXT

15.CHECK WHETHER DTC OUTPUT RECURS (DTC P2A0026 OR P2A0326)
15.CHECK WHETHER DTC OUTPUT RECURS (DTC P2A0026 OR P2A0326)
a.

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


b.

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

Powertrain > Engine > Utility
Tester Display
All Readiness
50005 372 20

c.

Input the DTC: P2A0026 or P2A0326.


d.

Check the DTC judgment result.

Result:
Result Proceed to
NORMAL
(DTCs are not output) 		A
ABNORMAL
(DTC P2A0026 or P2A0326 is output) 		B




A

END

B

REPLACE ECM

Click hereEngine / Hybrid System>7GR-FKS (ENGINE CONTROL)>ECM>REMOVAL