Toyota Tundra 2005 Service - Repair - Maintenance page 500

INSPECTION PROCEDURE
HINT:
Read freeze frame data using the hand−held tester. Freeze frame data records the engine conditions when
a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was
running or stopped, if the engine was warmed up or not, if the air−fuel ratio was lean or rich, as well as other
data from the time when a malfunction occurred.
1 Are there any other codes (besides DTC P0420 or P0430) being output?
PREPARATION:
(a) Connect the hand−held tester to the DLC3.
(b) Turn the ignition switch to ON and push the hand−held tester main switch ON.
(c) When using hand−held tester, enter the following menu: DIAGNOSIS / ENHANCED OBD II / DTC
INFO / CURRENT CODES.
CHECK:
Read the DTC using the hand−held tester.
RESULT:
Display (DTC Output)
"P0420 and/or P0430"
"P0420 or P0430" and other DTCs
HINT:
If any other codes besides "P0420 and/or P0430" are output, perform the troubleshooting for those DTCs
first.
A
2 Check gas leakage on exhaust system.
OK
3 Check A/F sensor (bank 1, 2 sensor 1) (See page SF−64).
HINT:
Refer to the HINT following the end of this flowchart.
OK
DIAGNOSTICS − ENGINE (1GR−FE)
B Go to DTC chart (See page DI−57).
NG Repair or replace exhaust gas leakage point.
NG Replace A/F sensor.
Proceed to
A
B
DI−233