Toyota Tundra (2015 year). Manual — part 1932
(e) Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Injection
Volume for A/F Sensor.
(f) Perform the Control the Injection Volume operation with the engine idling.
HINT:
INJECTION VOLUME
STATUS
VOLTAGE
AFS Voltage B1S1 or AFS Voltage B2S1
(Air fuel ratio)
+12.5%
Rich
Below 3.1 V
-12.5%
Lean
Higher than 3.4 V
O2S B1S2 or O2S B2S2
(Heated oxygen)
+12.5%
Rich
Higher than 0.55 V
-12.5%
Lean
Below 0.4 V
Result
STATUS OF AFS
VOLTAGE B1S1 OR
AFS VOLTAGE B2S1
STATUS OF
O2S B1S2 OR
O2S B2S2
AIR FUEL RATIO CONDITION
AND AIR FUEL RATIO AND
HEATED OXYGEN SENSOR
CONDITION
SUSPECTED TROUBLE AREA PROCEED
TO
Lean/Rich
Lean/Rich
Normal
Three-way
catalytic
converter
Gas leaks from
exhaust system
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
Heated oxygen
sensor
Gas leaks from
exhaust system
C
Lean/Rich
Rich
Heated oxygen sensor
malfunction
Heated oxygen
sensor
Gas leaks from
exhaust system
C
Lean
Lean
Actual air fuel ratio lean
Extremely rich or
lean actual air
fuel ratio
Gas leaks from
exhaust system
D
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0420,P0430;...
A
OK
STATUS OF AFS
VOLTAGE B1S1 OR
AFS VOLTAGE B2S1
STATUS OF
O2S B1S2 OR
O2S B2S2
AIR FUEL RATIO CONDITION
AND AIR FUEL RATIO AND
HEATED OXYGEN SENSOR
CONDITION
SUSPECTED TROUBLE AREA PROCEED
TO
Rich
Rich
Actual air fuel ratio rich
Extremely rich or
lean actual air
fuel ratio
Gas leaks from
exhaust system
D
Lean: During the Control the Injection Volume Active Test, the air fuel ratio sensor output voltage (AFS
Voltage) is consistently higher than 3.4 V, and the heated oxygen sensor output voltage (O2S) is
consistently below 0.4 V.
Rich: During the Control the Injection Volume Active Test, the AFS Voltage is consistently below 3.1 V, and the
O2S is consistently higher than 0.55 V.
(h) Refer to "Data List / Active Test" [AFS Voltage B1S1, AFS Voltage B2S1, O2S B1S2 and O2S
B2S2]
.
B
REPLACE AIR FUEL RATIO SENSOR
C
GO TO STEP 5
D
GO TO STEP 6
3.
CHECK FOR EXHAUST GAS LEAK
(a) Check for exhaust gas leaks from the exhaust manifold sub-assembly and exhaust pipes.
OK:
No gas leaks.
HINT:
Perform "Inspection After Repair" after repairing or replacing the exhaust system
.
NG
REPAIR OR REPLACE FOR EXHAUST GAS LEAK
POINT
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0420,P0430;...
4.
CHECK DTC OUTPUT (DTC P0420 AND/OR P0430)
(a) According to the output DTCs in the step 1 (Check Any Other DTCs Output), proceed to next
step referring to the table below.
Result
RESULT
PROCEED TO
P0420 is output
A
P0430 is output
B
P0420 and P0430 are output
A and B
B
REPLACE FRONT EXHAUST PIPE ASSEMBLY (TWC:
FRONT CATALYST AND REAR CATALYST)
A
REPLACE FRONT NO. 2 EXHAUST PIPE ASSEMBLY
(TWC: FRONT CATALYST AND REAR CATALYST)
5.
CHECK FOR EXHAUST GAS LEAK
(a) Check for exhaust gas leaks from the exhaust manifold assembly and exhaust pipes.
OK:
No gas leaks.
HINT:
Perform "Inspection After Repair" after repairing or replacing the exhaust system
.
Perform "Inspection After Repair" after replacing the heated oxygen sensor
.
NG
REPAIR OR REPLACE EXHAUST GAS LEAK
POINT
OK
REPLACE HEATED OXYGEN SENSOR
6.
CHECK FOR EXHAUST GAS LEAK
(a) Check for exhaust gas leaks from the exhaust manifold assembly and exhaust pipes.
OK:
No gas leaks.
HINT:
Perform "Inspection After Repair" after repairing or replacing the exhaust system
.
NG
REPAIR OR REPLACE EXHAUST GAS LEAK
POINT
OK
CHECK CAUSE OF EXTREMELY RICH OR LEAN
ACTUAL AIR-FUEL RATIO
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0420,P0430;...
3UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P0420,P0430;...
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