RM3660EC _51 Engine / Hybrid System _080777 NR Series ENGINE CONTROL _0393969 SFI SYSTEM C

NR Series ENGINE CONTROL  SFI SYSTEM  P2A0026  O2 Sensor Circuit Range/Performance Bank 1 Sensor 1 Signal Rate of Change Below Threshold  


DESCRIPTION

Refer to DTC P003012.

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>SFI SYSTEM>P003012

HINT:

Although the DTC titles say oxygen sensor, this DTC relate to the air fuel ratio sensor (sensor 1).


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 (sensor 1) response rate deterioration level is less than the threshold (2 trip detection logic).
·

Air fuel ratio sensor (sensor 1)

·

Intake system

·

Fuel injector assembly

·

Fuel pressure (for low pressure side)

·

Fuel pressure assembly (high pressure side)

·

Fuel system

·

Fuel pump (for low pressure side)

·

Gas leak from exhaust system

·

ECM


Comes on DTC stored SAE Code:
P2A00

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 (sensor 1) 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 (sensor 1) response rate. The ECM receives a signal from the air fuel ratio sensor (sensor 1) while performing active air fuel ratio control and uses it to calculate the air fuel ratio sensor (sensor 1) response rate deterioration level.

If the value for the air fuel ratio sensor (sensor 1) response rate deterioration level is less than the threshold, the ECM interprets this as a malfunction and stores this DTC.

A402680E01
4.229,1.49 4.073,1.063 false 5.208,1.635 5.438,1.01 false 0.083,0.094 2.833,0.365 2.75,0.271 10 false Air Fuel Ratio Sensor (Sensor 1) Output: 0.073,0.729 1.875,1.125 1.802,0.396 10 false Active Air Fuel Ratio Control 2,0.635 2.323,0.823 0.323,0.188 10 false ON 2,0.854 2.323,1.042 0.323,0.188 10 false OFF 3.802,0.177 6.198,0.417 2.396,0.24 10 false Approximately 30 seconds or more 0.042,2.729 1.573,3.125 1.531,0.396 10 false Fuel Injection Volume 0.073,1.635 2.104,2.125 2.031,0.49 10 false Air Fuel Ratio Sensor (Sensor 1) Output 2.844,2.49 3.438,2.74 0.594,0.25 10 false Increase 2.813,2.99 3.656,3.313 0.844,0.323 10 false Decrease 3.625,0.958 4.177,1.198 0.552,0.24 10 false Normal 5.469,0.938 6.198,1.219 0.729,0.281 10 false Malfunction

MONITOR STRATEGY

Required Sensors/Components Air fuel ratio sensor (sensor 1)
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 1000 rpm or higher, and less than 4000 rpm
Air fuel ratio sensor (sensor 1) status Activated
Engine load 10% or higher, and less than 100%
Catalyst monitor Not yet
Mass air flow 4.2 gm/sec or more, and less than 21.6 gm/sec

CONFIRMATION DRIVING PATTERN

HINT:
·

Performing this confirmation driving pattern will activate the air fuel ratio sensor (sensor 1) response monitor.

·

After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>SFI SYSTEM>DTC CHECK / CLEAR

·

When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>SFI SYSTEM>DTC CHECK / CLEAR



A295461E56
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 0.781,1.156 1.313,1.333 0.531,0.177 10 false 60 km/h 0.948,2.188 1.333,2.365 0.385,0.177 10 false Idling 0.198,2.479 1.688,2.813 1.49,0.333 10 false Ignition Switch off 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.

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

7.

Turn the GTS on.

8.

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.


9.

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

10.

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.



11.

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

12.

Input the DTC: P2A0026.

13.

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 shows NORMAL, the system is normal.

·

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

·

If the judgment result is INCOMPLETE, perform steps [D] through [E].

·

[A] to [C]: Normal judgment procedure.

The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

·

When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.



14.

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.


15.

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

16.

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.



17.

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

18.

Input the DTC: P2A0026.

19.

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 shows NORMAL, the system is normal.

·

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

·

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

·

[A] to [E]: Normal judgment procedure.

The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

·

When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.




CAUTION / NOTICE / HINT

NOTICE:

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


HINT:
·

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

·

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

·

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

·

A low air fuel ratio sensor (sensor 1) 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 (sensor 1) voltage could be caused by a lean air fuel mixture. Check for conditions that would cause the engine to run lean.

·

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)
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 is output A
DTC P2A0026 and other DTCs are output B


HINT:

If any DTCs other than P2A0026 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>NR Series (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.

Warm up the air fuel ratio sensors at an engine speed of 2500 rpm for 90 seconds.


f.

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 A/F (O2) Sensor Current B1S2.

Powertrain > Engine > Active Test
Active Test Display
Control the Injection Volume for A/F Sensor
Data List Display
Coolant Temperature
A/F (O2) Sensor Voltage B1S1
A/F (O2) Sensor Current B1S2
50004 372 8 205,225,564

g.

Perform the Control the Injection Volume for A/F Sensor operation with the engine idling (change the fuel injection volume).


h.

Monitor the output values of the air fuel ratio sensors (A/F (O2) Sensor Voltage B1S1 and A/F (O2) Sensor Current B1S2) 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 (sensor 1) has an output delay of a few seconds and the air fuel ratio sensor (sensor 2) has a maximum output delay of approximately 20 seconds.

·

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



Standard:
GTS Display (Sensor) Injection Volume Status Value
A/F (O2) Sensor Voltage B1S1
(Air fuel ratio sensor (sensor 1)) 		12.5% Rich Below 3.1 V
-12.5% Lean Higher than 3.4 V
A/F (O2) Sensor Current B1S2
(Air fuel ratio sensor (sensor 2)) 		12.5% Rich Below -0.86 mA
-12.5% Lean More than 0.33 mA


Result:
Status of A/F (O2) Sensor Voltage B1S1 Status of A/F (O2) Sensor Current B1S2 Air Fuel Ratio Condition and Air Fuel Ratio Sensor (Sensor 1) 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 (sensor 1) malfunction C
Rich Lean/Rich Air fuel ratio sensor (sensor 1) malfunction


Lean: During the Control the Injection Volume for A/F Sensor Active Test, the air fuel ratio sensor (sensor 1) output voltage (A/F (O2) Sensor Voltage B1S1) is consistently higher than 3.4 V, and the air fuel ratio sensor (sensor 2) output current (A/F (O2) Sensor Current B1S2) is consistently more than 0.33 mA.

Rich: During the Control the Injection Volume for A/F Sensor Active Test, the air fuel ratio sensor (sensor 1) output voltage (A/F (O2) Sensor Voltage B1S1) is consistently below 3.1 V, and the air fuel ratio sensor (sensor 2) output current (A/F (O2) Sensor Current B1S2) is consistently below -0.86 mA.

Lean/Rich: During the Control the Injection Volume for A/F Sensor Active Test, the output value of the air fuel ratio sensor (sensor 1) or air fuel ratio sensor (sensor 2) alternate correctly.


HINT:

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

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>SFI SYSTEM>DATA LIST / ACTIVE TEST




A

3.CLEAR DTC

B

5.INSPECT AIR FUEL RATIO SENSOR (SENSOR 1) (HEATER RESISTANCE)

C

11.REPLACE AIR FUEL RATIO SENSOR (SENSOR 1)
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 DTCs.

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)
4.CHECK WHETHER DTC OUTPUT RECURS (DTC P2A0026)
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.


d.

Check the DTC judgment result.

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




A

CHECK FOR INTERMITTENT PROBLEMS

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>SFI SYSTEM>CHECK FOR INTERMITTENT PROBLEMS


B

11.REPLACE AIR FUEL RATIO SENSOR (SENSOR 1)
5.INSPECT AIR FUEL RATIO SENSOR (SENSOR 1) (HEATER RESISTANCE)
a.

Inspect the air fuel ratio sensor (sensor 1).

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>AIR FUEL RATIO SENSOR (for Sensor 1)>INSPECTION


HINT:

Perform "Inspection After Repair" after replacing the air fuel ratio sensor (sensor 1).

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>SFI SYSTEM>INITIALIZATION


Result:
Proceed to
OK
NG



OK

6.CHECK INTAKE SYSTEM

NG

REPLACE AIR FUEL RATIO SENSOR (SENSOR 1)

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>AIR FUEL RATIO SENSOR (for Sensor 1)>REMOVAL


6.CHECK INTAKE SYSTEM
a.

Check the intake system for vacuum leaks.

Click hereEngine / Hybrid System>NR Series (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>NR Series (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>NR Series (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>NR Series (FUEL)>FUEL SYSTEM>ON-VEHICLE INSPECTION


Result:
Proceed to
OK
NG



OK

9.READ VALUE USING GTS (HIGH FUEL PRESSURE SENSOR)

NG

14.INSPECT FUEL PUMP (FOR LOW PRESSURE SIDE)
9.READ VALUE USING GTS (HIGH FUEL PRESSURE SENSOR)
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 / High Fuel Pressure Sensor.

Powertrain > Engine > Data List
Tester Display
High Fuel Pressure Sensor
50003 372 47

e.

Read the values.

Standard:
GTS Display Condition Specified Condition
High Fuel Pressure Sensor
·

Shift lever position: P

·

A/C: Off

·

Engine warmed up

·

Engine idling


2.4 to 30 MPa
·

Shift lever position: P

·

A/C: Off

·

Engine warmed up

·

Engine speed: 3000 rpm


2.4 to 30 MPa



Result:
Proceed to
OK
NG



OK

10.INSPECT FUEL INJECTOR ASSEMBLY

NG

REPAIR OR REPLACE FUEL SYSTEM (FOR HIGH PRESSURE SIDE)

10.INSPECT FUEL INJECTOR ASSEMBLY
a.

Check the resistance of the fuel injector assembly.

Click hereEngine / Hybrid System>NR Series (FUEL)>FUEL INJECTOR>INSPECTION


HINT:

Perform "Inspection After Repair" after replacing the fuel injector assembly.

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>SFI SYSTEM>INITIALIZATION


Result:
Proceed to
OK
NG



OK

11.REPLACE AIR FUEL RATIO SENSOR (SENSOR 1)

NG

REPLACE FUEL INJECTOR ASSEMBLY

Click hereEngine / Hybrid System>NR Series (FUEL)>FUEL INJECTOR>REMOVAL


11.REPLACE AIR FUEL RATIO SENSOR (SENSOR 1)
a.

Replace the air fuel ratio sensor (sensor 1).

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>AIR FUEL RATIO SENSOR (for Sensor 1)>REMOVAL

HINT:

Perform "Inspection After Repair" after replacing the air fuel ratio sensor (sensor 1).

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>SFI SYSTEM>INITIALIZATION



Result:
Proceed to
NEXT



NEXT

12.CLEAR DTC
12.CLEAR DTC
a.

Connect the GTS to the DLC3.


b.

Turn the ignition switch to ON.


c.

Turn the GTS on.


d.

Clear the DTCs.

Powertrain > Engine > Clear DTCs
50002 372

e.

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


Result:
Proceed to
NEXT



NEXT

13.CHECK WHETHER DTC OUTPUT RECURS (DTC P2A0026)
13.CHECK WHETHER DTC OUTPUT RECURS (DTC P2A0026)
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.


d.

Check the DTC judgment result.

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




A

END

B

REPLACE ECM

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>ECM>REMOVAL


14.INSPECT FUEL PUMP (FOR LOW PRESSURE SIDE)
a.

Inspect the fuel pump (for low pressure side).

Click hereEngine / Hybrid System>NR Series (FUEL)>FUEL PUMP>INSPECTION


HINT:

Perform "Inspection After Repair" after replacing the fuel pump (for low pressure side).

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>SFI SYSTEM>INITIALIZATION


Result:
Proceed to
OK
NG



OK

REPAIR OR REPLACE FUEL LINE (FOR LOW PRESSURE SIDE)

NG

REPLACE FUEL PUMP (FOR LOW PRESSURE SIDE)

Click hereEngine / Hybrid System>NR Series (FUEL)>FUEL PUMP>REMOVAL