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

NR Series ENGINE CONTROL  SFI SYSTEM  P042000  Catalyst System Efficiency Below Threshold Bank 1  


MONITOR DESCRIPTION

The ECM uses air fuel ratio sensors mounted in front of and behind the Three-Way Catalytic Converter (TWC) to monitor its efficiency.

The first sensor, the air fuel ratio sensor (sensor 1), sends pre-catalyst information to the ECM. The second sensor, the air fuel ratio sensor (sensor 2), sends post-catalyst information to the ECM.

In order to detect any deterioration in the three-way catalytic converter, the ECM calculates the oxygen storage capacity of the three-way catalytic converter. This calculation is based on the output current of the air fuel ratio sensor (sensor 2) while performing active air fuel ratio control.

The oxygen storage capacity value is an indication of the oxygen storage capacity of the three-way catalytic converter. When the vehicle is being driven with a warm engine, active air fuel ratio control is performed for approximately 30 seconds. When it is performed, the ECM deliberately sets the air fuel ratio to lean or rich levels. If the cycle of the waveform for the air fuel ratio sensor (sensor 2) is long, the oxygen storage capacity is great. There is a direct correlation between the air fuel ratio sensor (sensor 2) and the oxygen storage capacity of the three-way catalytic converter.

The ECM uses the oxygen storage capacity value to determine the state of the three-way catalytic converter. If any deterioration has occurred, the ECM will illuminate the MIL and store a DTC.

This system determines the deterioration of the entire catalyst system (including the front and rear catalysts), by using the oxygen storage capacity value of the front catalyst, that is more sensitive than the rear catalyst, as the representative value. Therefore, be sure to replace the front and rear catalysts together when catalyst replacement is necessary.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P042000 Catalyst System Efficiency Below Threshold Bank 1 The oxygen storage capacity value is less than the standard value under active air fuel ratio control (1 trip detection logic).
·

Gas leak from exhaust system

·

Air fuel ratio sensor (sensor 1)

·

Air fuel ratio sensor (sensor 2)

·

Exhaust manifold converter sub-assembly and front exhaust pipe assembly


Comes on DTC stored SAE Code:
P0420

CATALYST LOCATION

A446109C01
0.635,0.271 0.885,0.271 0.885,0.271 1.125,0.583 true 1.833,0.615 1.604,0.615 1.604,0.615 1.438,0.854 true 2.771,1.448 2.542,1.448 2.542,1.448 2.344,1.823 true 2.677,2.813 2.448,2.813 2.448,2.813 2.313,3.135 true 5.708,2.198 5.479,2.198 5.479,2.198 5.188,1.625 true 1.344,1 1.198,1 1.198,1 1.115,1.219 true 2.365,2.031 2.219,2.031 2.219,2.031 2.135,2.25 true 1.865,0.552 2.177,0.708 0.313,0.156 10 false *1 2.823,1.365 3.135,1.521 0.313,0.156 10 false *2 5.76,2.125 6.073,2.281 0.313,0.156 10 false *3 0.448,0.188 0.76,0.344 0.313,0.156 10 false *4 2.729,2.75 3.042,2.906 0.313,0.156 10 false *5 1.375,0.917 1.688,1.073 0.313,0.156 10 false *6 2.406,1.948 2.719,2.104 0.313,0.156 10 false *7
*1 Exhaust Manifold Converter Sub-assembly *2 Front Exhaust Pipe Assembly
*3 Tail Exhaust Pipe Assembly *4 Air Fuel Ratio Sensor (Sensor 1)
*5 Air Fuel Ratio Sensor (Sensor 2) *6 TWC: Front Catalyst
*7 TWC: Rear Catalyst - -


NOTICE:

Replace the exhaust manifold converter sub-assembly (*1) and the front exhaust pipe assembly (*2) together when catalyst replacement is necessary. (Excluding air fuel ratio sensor (sensor 1)*4 and air fuel ratio sensor (sensor 2)*5)


MONITOR STRATEGY

Required Sensors/Components (Main) Air fuel ratio sensor (sensor 1)
Air fuel ratio sensor (sensor 2)
Required Sensors/Components (Related) Intake air temperature sensor (mass air flow meter sub-assembly)
Mass air flow meter sub-assembly
Crankshaft position sensor
Engine coolant temperature sensor
Frequency of Operation Once per driving cycle

TYPICAL ENABLING CONDITIONS

Battery voltage 11 V or higher
Intake air temperature -10°C (14°F) or higher
Engine coolant temperature 75°C (167°F) or higher
Atmospheric pressure 76 kPa(abs) [11.02 psi(abs)] or higher
Idling Off
Engine speed Less than 4000 rpm
Air fuel ratio sensor (sensor 1) status Activated
Fuel system status Closed loop
Engine load 10% or higher, and less than 140%
All of the following conditions are met -
Mass air flow rate 6.0 to 40 gm/sec.
Front catalyst temperature (estimated) 520°C (968°F) to 800°C (1472°F)
Rear catalyst temperature (estimated) 395°C (743°F) to 700°C (1292°F)

CONFIRMATION DRIVING PATTERN

HINT:
·

Performing this confirmation driving pattern will activate the catalyst efficiency monitor. This is very useful for verifying the completion of a repair.

·

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



A387619E16
1.333,0.865 1.698,0.469 1.698,0.469 1.854,0.469 false 0.729,1.146 1.385,1.406 0.656,0.26 10 false 60 km/h 0.938,2.208 1.406,2.458 0.469,0.25 10 false Idling 0.188,2.458 1.385,2.74 1.198,0.281 10 false Ignition Switch off 0.146,3.438 4.74,3.74 4.594,0.302 10 false *: Drive the vehicle while keeping the engine load as constant as possible 1.906,0.385 3.552,0.698 1.646,0.313 10 false Between 75 to 100 km/h 1.677,2.104 1.948,2.344 0.271,0.24 10 false [A] 1.51,2.719 2.083,3.115 0.573,0.396 10 false Warming up 2.615,1.021 2.938,1.281 0.323,0.26 10 false [B]* 2.365,2.75 3.083,3.104 0.719,0.354 10 false 10 minutes or more 3.146,3.135 3.448,3.396 0.302,0.26 10 false [C] 3.49,2.115 3.781,2.365 0.292,0.25 10 false [D] 3.375,2.719 3.99,3.073 0.615,0.354 10 false Warming up 4.406,1.052 4.74,1.323 0.333,0.271 10 false [E]* 4.135,2.76 4.844,3.177 0.708,0.417 10 false 10 minutes or more 5.01,3.146 5.313,3.417 0.302,0.271 10 false [F] 6.167,0.656 6.531,0.938 0.365,0.281 10 false [G]* 5.906,2.719 6.635,3.25 0.729,0.531 10 false 10 minutes or more 6.771,3.125 7.021,3.365 0.25,0.24 10 false [H] 0.844,0.104 1.792,0.354 0.948,0.25 10 false Vehicle Speed 6.802,3.438 7.135,3.646 0.333,0.208 10 false Time

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].

HINT:

In order to keep the idle stable, turn the A/C and all other electric loads off and do not perform any shift operations.


7.

Turn the GTS on.

8.

Drive the vehicle at approximately 60 km/h (37 mph) for 10 minutes or more [B].

CAUTION:

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


HINT:

Drive the vehicle while keeping the engine load as constant as possible.


9.

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

10.

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

11.

Turn the GTS on.

12.

Drive the vehicle at approximately 60 km/h (37 mph) for 10 minutes or more [E].

CAUTION:

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


HINT:

Drive the vehicle while keeping the engine load as constant as possible.


13.

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

14.

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.



15.

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

16.

Input the DTC: P042000.

17.

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 the following procedure.

·

[A] to [F]: 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.



18.

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

CAUTION:

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


HINT:

Drive the vehicle while keeping the engine load as constant as possible.


19.

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

20.

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.



21.

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

22.

Input the DTC: P042000.

23.

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.

·

[A] to [H]: 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

HINT:
·

If a malfunction cannot be found when troubleshooting DTC P042000, a lean or rich abnormality may be the cause. Perform troubleshooting by following the inspection procedure for P017100 (System Too Lean) and P017200 (System Too Rich).

·

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 P042000)
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 P042000 is output A
DTC P042000 and other DTCs are output B


HINT:

If any DTCs other than P042000 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.

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


c.

Turn the GTS on.


d.

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


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 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

f.

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


g.

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 Sensors Condition Main Suspected Trouble Area Proceed to
Lean/Rich Lean/Rich Normal
·

Three-way catalytic converter

·

Gas leak from exhaust system


A
Lean Lean/Rich Air fuel ratio sensor (sensor 1) malfunction
·

Air fuel ratio sensor (sensor 1)


B
Rich Lean/Rich Air fuel ratio sensor (sensor 1) malfunction
·

Air fuel ratio sensor (sensor 1)


Lean/Rich Lean Air fuel ratio sensor (sensor 2) malfunction
·

Air fuel ratio sensor (sensor 2)

·

Gas leak from exhaust system


C
Lean/Rich Rich Air fuel ratio sensor (sensor 2) malfunction
·

Air fuel ratio sensor (sensor 2)

·

Gas leak from exhaust system


Lean Lean Actual air fuel ratio lean
·

Extremely lean actual air fuel ratio

·

Gas leak from exhaust system


D
Rich Rich Actual air fuel ratio rich
·

Extremely rich actual air fuel ratio

·

Gas leak from exhaust system




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.CHECK FOR EXHAUST GAS LEAK

B

4.REPLACE AIR FUEL RATIO SENSOR (SENSOR 1)

C

5.CHECK FOR EXHAUST GAS LEAK

D

7.CHECK FOR EXHAUST GAS LEAK
3.CHECK FOR EXHAUST GAS LEAK
a.

Check for exhaust gas leaks.

OK:

No gas leaks in exhaust system.


Result:
Proceed to
OK
NG




OK

12.REPLACE EXHAUST MANIFOLD CONVERTER SUB-ASSEMBLY (TWC: FRONT CATALYST) AND FRONT EXHAUST PIPE ASSEMBLY (TWC: REAR CATALYST)

NG

9.REPAIR OR REPLACE EXHAUST SYSTEM
4.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

10.CLEAR DTC
5.CHECK FOR EXHAUST GAS LEAK
a.

Check for exhaust gas leaks.

OK:

No gas leaks in exhaust system.



Result:
Proceed to
OK
NG



OK

6.REPLACE AIR FUEL RATIO SENSOR (SENSOR 2)

NG

9.REPAIR OR REPLACE EXHAUST SYSTEM
6.REPLACE AIR FUEL RATIO SENSOR (SENSOR 2)
a.

Replace the air fuel ratio sensor (sensor 2).

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>AIR FUEL RATIO SENSOR (for Sensor 2)>REMOVAL

HINT:

Perform "Inspection After Repair" after replacing the air fuel ratio sensor (sensor 2).

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



Result:
Proceed to
NEXT



NEXT

10.CLEAR DTC
7.CHECK FOR EXHAUST GAS LEAK
a.

Check for exhaust gas leaks.

OK:

No gas leaks in exhaust system.



Result:
Proceed to
OK
NG



OK

8.CHECK CAUSE OF EXTREMELY RICH OR LEAN ACTUAL AIR FUEL RATIO

NG

9.REPAIR OR REPLACE EXHAUST SYSTEM
8.CHECK CAUSE OF EXTREMELY RICH OR LEAN ACTUAL AIR FUEL RATIO
a.

Check the cause of extremely rich or lean actual air fuel ratio, referring to the DTC P017100 and P017200 Inspection Procedure.

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>SFI SYSTEM>P017100


Result:
Proceed to
NEXT



NEXT

10.CLEAR DTC
9.REPAIR OR REPLACE EXHAUST SYSTEM
a.

Repair or replace 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
NEXT



NEXT

10.CLEAR DTC
10.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

11.CHECK WHETHER DTC OUTPUT RECURS (DTC P042000)
11.CHECK WHETHER DTC OUTPUT RECURS (DTC P042000)
a.

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


b.

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


c.

Read the DTCs.

Powertrain > Engine > Trouble Codes
50001 372
Result:
Result Proceed to
DTCs are not output A
DTC P042000 is output B




A

END

B

12.REPLACE EXHAUST MANIFOLD CONVERTER SUB-ASSEMBLY (TWC: FRONT CATALYST) AND FRONT EXHAUST PIPE ASSEMBLY (TWC: REAR CATALYST)
12.REPLACE EXHAUST MANIFOLD CONVERTER SUB-ASSEMBLY (TWC: FRONT CATALYST) AND FRONT EXHAUST PIPE ASSEMBLY (TWC: REAR CATALYST)
NOTICE:

When replacing the exhaust manifold converter sub-assembly and the front exhaust pipe assembly in order to replace the three-way catalytic converter, it is not necessary to replace the air fuel ratio sensor (sensor 1) and the air fuel ratio sensor (sensor 2).


HINT:

Confirm the replacement parts, referring to the illustration in Catalyst Location.


a.

Replace the exhaust manifold converter sub-assembly.

Click hereEngine / Hybrid System>NR Series (EMISSION CONTROL)>MONOLITHIC CONVERTER>COMPONENTS


b.

Replace the front exhaust pipe assembly.

Click hereEngine / Hybrid System>NR Series (INTAKE / EXHAUST)>EXHAUST PIPE>COMPONENTS


Result:
Proceed to
NEXT



NEXT

END