- Gas leaks from exhaust system
- Air fuel ratio sensor (bank 1 sensor 1)
- Heated oxygen sensor (bank 1 sensor 2)
- Exhaust manifold sub-assembly RH (TWC: Front catalyst) and center exhaust pipe assembly (TWC: Rear catalyst)
| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM100000000VIA1 |
| Model Year Start: 2016 | Model: Sienna | Prod Date Range: [12/2015 - 08/2016] |
| Title: 2GR-FE (ENGINE CONTROL): SFI SYSTEM: P0420,P0430; Catalyst System Efficiency Below Threshold (Bank 1); 2016 MY Sienna [12/2015 - 08/2016] | ||
|
DTC |
P0420 |
Catalyst System Efficiency Below Threshold (Bank 1) |
|
DTC |
P0430 |
Catalyst System Efficiency Below Threshold (Bank 2) |
DESCRIPTION
The ECM uses the sensors mounted in front of and behind the three-way catalytic converter to monitor its efficiency.
The first sensor, the air fuel ratio sensor, sends pre-catalyst information to the ECM. The second sensor, the heated oxygen sensor, 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 voltage output of the heated oxygen sensor while performing active air fuel ratio control, rather than the conventional detecting method, which uses the locus ratio.
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 15 to 20 seconds. When it is performed, the ECM deliberately sets the air fuel ratio to lean or rich levels. If the rich-lean cycle of the heated oxygen sensor is long, the oxygen storage capacity is large. There is a direct correlation between the oxygen storage capacity of the three-way catalytic converter and the response of the heated oxygen sensor.
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 illuminates the MIL and stores 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. |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
P0420 |
Oxygen storage capacity value smaller than standard value under active air fuel ratio control (1 trip detection logic) |
|
|
P0430 |
Oxygen storage capacity value smaller than standard value under active air fuel ratio control (1 trip detection logic) |
|
CATALYST LOCATION
Text in Illustration
|
*A |
for 2WD |
- |
- |
|
*1 |
Air Fuel Ratio Sensor (Bank 2 Sensor 1) |
*2 |
Air Fuel Ratio Sensor (Bank 1 Sensor 1) |
|
*3 |
Heated Oxygen Sensor (Bank 2 Sensor 2) |
*4 |
Heated Oxygen Sensor (Bank 1 Sensor 2) |
|
*5 |
TWC: Front Catalyst |
*6 |
Front Exhaust Pipe Assembly |
|
*7 |
Tail Exhaust Pipe Assembly |
*8 |
TWC: Rear Catalyst |
|
*9 |
Exhaust Manifold Sub-assembly LH |
*10 |
Exhaust Manifold Sub-assembly RH |
|
*11 |
Center Exhaust Pipe Assembly |
- |
- |
NOTICE:
- When outputting DTC P0420 replace the exhaust manifold sub-assembly RH (*10) and the center exhaust pipe assembly (*11) together when catalyst replacement is necessary (Excluding air fuel ratio sensor *2 and heated oxygen sensor *4).
- When outputting DTC P0430 replace the exhaust manifold sub-assembly LH (*9) and the front exhaust pipe assembly (*11) together when catalyst replacement is necessary (Excluding air fuel ratio sensor *1 and heated oxygen sensor *3).
Text in Illustration
|
*A |
for 4WD |
- |
- |
|
*1 |
Air Fuel Ratio Sensor (Bank 2 Sensor 1) |
*2 |
Air Fuel Ratio Sensor (Bank 1 Sensor 1) |
|
*3 |
Heated Oxygen Sensor (Bank 2 Sensor 2) |
*4 |
Heated Oxygen Sensor (Bank 1 Sensor 2) |
|
*5 |
TWC: Front Catalyst |
*6 |
TWC: Rear Catalyst |
|
*7 |
Front Exhaust Pipe Assembly |
*8 |
Tail Exhaust Pipe Assembly |
|
*9 |
Exhaust Manifold Sub-assembly LH |
*10 |
Exhaust Manifold Sub-assembly RH |
|
*11 |
Center Exhaust Pipe Assembly |
- |
- |
NOTICE:
- When outputting DTC P0420 replace the exhaust manifold sub-assembly RH (*10) and the center exhaust pipe assembly (*11) together when catalyst replacement is necessary (Excluding air fuel ratio sensor *2 and heated oxygen sensor *4).
- When outputting DTC P0430 replace the exhaust manifold sub-assembly LH (*9) and the front exhaust pipe assembly (*11) together when catalyst replacement is necessary (Excluding air fuel ratio sensor *1 and heated oxygen sensor *3).
MONITOR STRATEGY
|
Related DTCs |
P0420: Catalyst deterioration (bank 1) P0430: Catalyst deterioration (bank 2) |
|
Required Sensors / Components (Main) |
Air fuel ratio sensor and heated oxygen sensor |
|
Required Sensors / Components (Related) |
Intake air temperature sensor, mass air flow meter, crankshaft position sensor and engine coolant temperature sensor |
|
Frequency of Operation |
Once per driving cycle |
|
Duration |
Approximately 30 seconds |
|
MIL Operation |
1 driving cycle |
|
Sequence of Operation |
None |
TYPICAL ENABLING CONDITIONS
|
Monitor runs whenever following DTCs are not present |
P0010, P0020 (Camshaft timing oil control valve assembly bank 1, 2) P0011, P0021 (VVT system bank 1, 2 - advance) P0012, P0022 (VVT system bank 1, 2 - retard) P0013, P0023 (Exhaust camshaft timing oil control valve assembly bank 1, 2) P0014, P0024 (Exhaust VVT system bank 1, 2 - advance) P0015, P0025 (Exhaust VVT system bank 1, 2 - retard) P0016, P0018 (VVT system bank 1, 2 - misalignment) P0017, P0019 (Exhaust VVT system bank 1, 2 - misalignment) P0031, P0032, P0051, P0052, P101D, P103D (Air fuel ratio sensor heater) P0037, P0038, P0057, P0058, P102D, P105D (Heated oxygen sensor heater) P0102, P0103 (Mass air flow meter) P0115, P0117, P0118 (Engine coolant temperature sensor) P0120, P0121, P0122, P0123, P0220, P0222, P0223, P2135 (Throttle position sensor) P0125 (Insufficient engine coolant temperature for closed loop) P0136, P0137, P0138, P0139, P013A, P013C, P0156, P0157, P0158, P0159, P0607 (Heated oxygen sensor) P014C, P014D, P014E, P014F, P015A, P015B, P015C, P015D, P2195, P2196, P2197, P2198, P2237, P2238, P2239, P2240, P2241, P2242, P2252, P2253, P2255, P2256 (Air fuel ratio sensor) P0171, P0172, P0174, P0175 (Fuel system) P0300, P0301, P0302, P0303, P0304, P0305, P0306 (Misfire) P0335 (Crankshaft position sensor) P0340, P0342, P0343, P0345, P0347, P0348 (VVT sensor) P0351, P0352, P0353, P0354, P0355, P0356 (Igniter) P0365, P0367, P0368, P0390, P0392, P0393 (Exhaust VVT sensor) P0500 (Vehicle speed sensor) P219A, P219B, P219C, P219D, P219E, P219F, P21A0, P21A1 (Air fuel ratio imbalance) |
|
Battery voltage |
11 V or higher |
|
Intake air temperature |
-10°C (14°F) or more |
|
Engine coolant temperature |
75°C (167°F) or more |
|
Atmospheric pressure |
76 kPa(abs) [570 mmHg(abs)] or more |
|
Idling |
OFF |
|
Engine speed |
Less than 3200 rpm |
|
Air fuel ratio sensor |
Activated |
|
Fuel system status |
Closed loop |
|
Engine load |
10% or more, and less than 85% |
|
All of the following conditions are met: |
Conditions 1, 2 and 3 |
|
1. Mass air flow rate |
5 g/sec. or more, and less than 75 g/sec. |
|
2. Front catalyst temperature (estimated) |
530°C (986°F) or more, and less than 860°C (1580°F) |
|
3. Rear catalyst temperature (estimated) |
430°C (806°F) or more, and less than 860°C (1580°F) |
|
Shift position |
3rd or more |
TYPICAL MALFUNCTION THRESHOLDS
|
Oxygen storage capacity of catalyst (Normalized) |
Less than 1 |
MONITOR RESULT
Refer to Checking Monitor Status (See page
![2016 MY Sienna [12/2015 - 08/2016]; 2GR-FE (ENGINE CONTROL): SFI SYSTEM: CHECKING MONITOR STATUS](/t3Portal/stylegraphics/info.gif)
).
CONFIRMATION DRIVING PATTERN
HINT:
- It is necessary that the response of the heated oxygen sensor is normal in order to confirm DTC P0420. Therefore, perform the driving pattern for the heated oxygen sensor monitor before performing the drive pattern for the catalyst efficiency monitor.
- Performing this confirmation driving pattern will activate the catalyst efficiency monitor. This is very useful for verifying the completion of a repair.
- Connect the Techstream to the DLC3.
- Turn the ignition switch to ON.
- Turn the Techstream on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the ignition switch off and wait for at least 30 seconds.
- Turn the ignition switch to ON and turn the Techstream on.
- Enter the following menus: Powertrain / Engine / Monitor / Current Monitor.
- Check that Catalyst Efficiency / Current is Incomplete.
-
Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher with the shift lever in P [A].
HINT:
In order to keep the idling stable, turn off the A/C and all other electric loads and do not perform any shift operations.
-
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.
-
With the shift lever in S, drive the vehicle at 75 km/h (47 mph), and then decelerate the vehicle by releasing the accelerator pedal for 5 seconds or more to perform the fuel-cut [C].
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
- Enter the following menus: Powertrain / Engine / Monitor / Current Monitor / O2 Sensor / RL F/C B1S2, RL F/C B2S2 [D].
-
Check the Test Value for RL F/C B1S2, RL F/C B2S2.
HINT:
- If Test Value displays a value larger than 0, perform the following procedure, as the O2 Sensor monitor is finished.
- If Test Value displays 0, perform step [C] until it displays a value larger than 0, as the O2 Sensor monitor is not finished.
- Turn the ignition switch off and wait for at least 30 seconds [F].
- Turn the ignition switch to ON and turn the Techstream on.
- Start the engine and warm it up until the engine coolant temperature is 75°C (167°F) or higher [G].
-
Drive the vehicle at approximately 60 km/h (37 mph) for 10 minutes or more [H].
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.
- The monitor item will change to Complete as the Catalyst Efficiency monitor operates.
- Enter the following menus: Powertrain / Engine / Trouble Codes [I].
-
Check if any DTCs are stored.
HINT:
If the monitor item does not change to Complete, and no DTCs are stored, perform the following procedure.
-
Drive the vehicle at a speed between 75 and 100 km/h (47 and 63 mph) for 10 minutes or more [J].
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.
- The monitor item will change to Complete as the Catalyst Efficiency monitor operates.
- Enter the following menus: Powertrain / Engine / Trouble Codes [K].
-
Check if any DTCs are stored.
HINT:
If the monitor item does not change to Complete, and no DTCs are stored, extend the driving time.
-
If no DTC is output, perform a universal trip and check for permanent DTCs (See page
).
HINT:
- If a permanent DTC is output, the system is malfunctioning.
- If no permanent DTC is output, the system is normal.
CONDITIONING FOR SENSOR TESTING
HINT:
Perform the operation with the engine speeds and time durations described below prior to checking the waveforms of the air fuel ratio and heated oxygen sensors. This is in order to activate the sensors sufficiently to obtain the appropriate inspection results.
- Connect the Techstream to the DLC3 [A].
- Start the engine and warm it up with all the accessories switched off, until the engine coolant temperature stabilizes [B].
- Run the engine at an engine speed of between 2500 rpm and 3000 rpm for at least 3 minutes [C].
-
While running the engine at 3000 rpm and 2500 rpm for 2 seconds, check the waveforms of the air fuel ratio and heated oxygen sensors using the Techstream [D].
HINT:
- If the voltage output of either the air fuel ratio or heated oxygen sensor does not fluctuate, or there is a noise in the waveform of either sensor, the sensor may be malfunctioning.
- If the voltage outputs of both the sensors remain lean or rich, the air fuel ratio may be extremely lean or rich. In such cases, perform the Control the Injection Volume A/F Sensor Active Test using the Techstream.
- If the three-way catalytic converter has deteriorated, the heated oxygen sensor (located behind the three-way catalytic converter) voltage output fluctuates up and down frequently, even under normal driving conditions (active air fuel ratio control is not performed).
CAUTION / NOTICE / HINT
HINT:
- If a malfunction cannot be found when troubleshooting DTC P0420 or P0430, a lean or rich abnormality may be the cause. Perform troubleshooting by following the inspection procedure for P0171 and P0174 (System Too Lean), and P0172 and P0175 (System Too Rich).
- Read freeze frame data using the Techstream. 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.
-
Bank 1 refers to the bank that includes the No. 1 cylinder*.
*: The No. 1 cylinder is the cylinder which is farthest from the transaxle.
- 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.
PROCEDURE
|
1. |
CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0420 AND/OR P0430) |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine / Trouble Codes.
(e) Read the DTCs.
Result
|
Result |
Proceed to |
|---|---|
|
DTC P0420 and/or P0430 are output |
A |
|
DTC P0420 and/or P0430 and other DTCs are output |
B |
HINT:
If any DTCs other than P0420 or P0430 are output, troubleshoot those DTCs first.
| B |
|
|
|
2. |
PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE INJECTION VOLUME for A/F Sensor) |
(a) Connect the Techstream to the DLC3.
(b) Start the engine and warm it up.
(c) Turn the Techstream on.
(d) Run the engine at an engine speed of 2500 rpm for approximately 90 seconds.
(e) Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor.
(f) Perform the Active Test operation with the engine idling (press the -12.5% or 12.5% button to change the fuel injection volume).
(g) Monitor the voltage outputs of the air fuel ratio and heated oxygen sensors (AFS Voltage B1S1 and O2S B1S2 or AFS Voltage B2S1 and O2S B2S2) displayed on the Techstream.
HINT:
- The fuel injection volume can be changed to -12.5% or 12.5%.
- Each sensor reacts in accordance with increases and decreases in the fuel injection volume.
- 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:
|
Techstream Display (Sensor) |
Injection Volume |
Status |
Voltage |
|---|---|---|---|
|
AFS Voltage B1S1 or AFS Voltage B2S1 (Air fuel ratio) |
12.5% |
Rich |
Less than 3.1 V |
|
AFS Voltage B1S1 or AFS Voltage B2S1 (Air fuel ratio) |
-12.5% |
Lean |
More than 3.4 V |
|
O2S B1S2 or O2S B2S2 (Heated oxygen) |
12.5% |
Rich |
More than 0.55 V |
|
O2S B1S2 or O2S B2S2 (Heated oxygen) |
-12.5% |
Lean |
Less than 0.4 V |
Result
|
Status AFS Voltage B1S1 or AFS Voltage B2S1 |
Status O2S B1S2 or O2S B2S2 |
Air Fuel Ratio Condition and Air Fuel Ratio and Heated Oxygen Sensor Condition |
Misfire |
Suspected Area |
Proceed to |
|---|---|---|---|---|---|
|
Lean/Rich |
Lean/Rich |
Normal |
- |
|
A |
|
Lean |
Lean/Rich |
Air fuel ratio sensor malfunction |
- |
Air fuel ratio sensor |
B |
|
Rich |
Lean/Rich |
Air fuel ratio sensor malfunction |
- |
Air fuel ratio sensor |
B |
|
Lean/Rich |
Lean |
Heated oxygen sensor malfunction |
- |
|
C |
|
Lean/Rich |
Rich |
Heated oxygen sensor malfunction |
- |
|
C |
|
Lean |
Lean |
Actual air fuel ratio lean |
May occur |
|
D |
|
Rich |
Rich |
Actual air fuel ratio rich |
- |
|
D |
Lean: During the Control the Injection Volume for A/F Sensor Active Test, the air fuel ratio sensor output voltage (AFS Voltage) is consistently more than 3.4 V, and the heated oxygen sensor output voltage (O2S) is consistently less than 0.4 V.
Rich: During the Control the Injection Volume for A/F Sensor Active Test, the AFS Voltage is consistently less than 3.1 V, and the O2S is consistently more than 0.55 V.
Lean/Rich: During the Control the Injection Volume for A/F Sensor Active Test, the output voltage of the air fuel ratio sensor and heated oxygen sensor alternates correctly.
| B |
|
| C |
|
| D |
|
|
|
3. |
CHECK FOR EXHAUST GAS LEAK |
(a) Inspect for exhaust gas leaks from the exhaust manifold sub-assembly and exhaust pipes.
OK:
No gas leaks.
| NG |
|
|
|
4. |
CHECK DTC OUTPUT (DTC P0420 AND/OR P0430) |
NOTICE:
- When outputting DTC P0420 replace the exhaust manifold sub-assembly RH (TWC: Front catalyst) and the center exhaust pipe assembly (TWC: Rear catalyst) together when catalyst replacement is necessary.
- When outputting DTC P0430 replace the exhaust manifold sub-assembly LH (TWC: Front catalyst) and the center exhaust pipe assembly (TWC: Rear catalyst) together when catalyst replacement is necessary.
HINT:
Confirm the replacement parts, referring to the illustration in the Catalyst Location.
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine / Trouble Codes.
(e) Read the DTCs.
Result
|
Result |
Vehicle Type |
Proceed to |
|---|---|---|
|
P0420 |
2WD |
A, C |
|
4WD |
A, D |
|
|
P0430 |
2WD |
B, C |
|
4WD |
B, D |
|
|
P0420 and P0430 |
2WD |
A, B, C |
|
4WD |
A, B, D |
| A |
|
REPLACE EXHAUST MANIFOLD SUB-ASSEMBLY RH (TWC: FRONT CATALYST) |
| B |
|
REPLACE EXHAUST MANIFOLD SUB-ASSEMBLY LH (TWC: FRONT CATALYST) |
| C |
|
| D |
|
|
5. |
CHECK FOR EXHAUST GAS LEAK |
(a) Check for exhaust gas leaks.
OK:
No gas leaks.
| OK |
|
| NG |
|
|
6. |
CHECK FOR EXHAUST GAS LEAK |
(a) Check for exhaust gas leaks.
OK:
No gas leaks.
| OK |
|
| NG |
|
|
7. |
REPLACE AIR FUEL RATIO SENSOR |
(a) Replace the air fuel ratio sensor (See page
).
HINT:
Perform "Inspection After Repair" after replacing the air fuel ratio sensor (See page
).
| NEXT |
|
|
8. |
REPAIR OR REPLACE EXHAUST GAS LEAK POINT |
(a) Repair or replace exhaust gas leak point.
HINT:
Perform "Inspection After Repair" after repairing or replacing the exhaust system (See page
).
| NEXT |
|
|
9. |
REPLACE HEATED OXYGEN SENSOR |
(a) Replace the heated oxygen sensor (See page
).
HINT:
Perform "Inspection After Repair" after replacing the heated oxygen sensor (See page
).
| NEXT |
|
|
10. |
CHECK CAUSE OF EXTREMELY RICH OR LEARN ACTUAL AIR FUEL RATIO |
(a) Check the cause of extremely rich or lean actual air fuel ratio, referring to the DTC P0171 Inspection Procedure (See page
).
|
|
11. |
CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Clear the DTCs (See page
).
(e) Turn the ignition switch off and wait for at least 30 seconds.
(f) Start the engine.
(g) Turn the Techstream on.
(h) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
(i) Enter the following menus: Powertrain / Engine / Trouble Codes.
(j) Read the pending DTCs.
Result
|
Result |
Proceed to |
|---|---|
|
DTC P0420 and/or P0430 is output |
A |
|
DTC is not output |
B |
| B |
|
END |
|
|
12. |
CHECK DTC OUTPUT (DTC P0420 AND/OR P0430) |
NOTICE:
- When outputting DTC P0420 replace the exhaust manifold sub-assembly RH (TWC: Front catalyst) and the center exhaust pipe assembly (TWC: Rear catalyst) together when catalyst replacement is necessary.
- When outputting DTC P0430 replace the exhaust manifold sub-assembly LH (TWC: Front catalyst) and the center exhaust pipe assembly (TWC: Rear catalyst) together when catalyst replacement is necessary.
HINT:
Confirm the replacement parts, referring to the illustration in the Catalyst Location.
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Engine / Trouble Codes.
(e) Read the DTCs.
Result
|
Result |
Vehicle Type |
Proceed to |
|---|---|---|
|
P0420 |
2WD |
A, C |
|
4WD |
A, D |
|
|
P0430 |
2WD |
B, C |
|
4WD |
B, D |
|
|
P0420 and P0430 |
2WD |
A, B, C |
|
4WD |
A, B, D |
| D |
|
| A |
|
REPLACE EXHAUST MANIFOLD SUB-ASSEMBLY RH (TWC: FRONT CATALYST) |
| B |
|
REPLACE EXHAUST MANIFOLD SUB-ASSEMBLY LH (TWC: FRONT CATALYST) |
| C |
|
|
|