Egr System Malfunction (California Only - Toyota 2VZ-FE Manual

Diag. Code
CIRCUIT DESCRIPTION
To reduce NOx emission, part of the exhaust gases are recirculated through the EGR valve to the in-
take manifold to lower the maximum combustion temperature.
Code No.
With engine warmed up and EGR
operation possible, code is displayed
when EGR gas temp. sensor is 55°C
71 (131°F) for M/T, 60 °C (140°F) for ECT
or less when vehicle is driven for 90
seconds (THG).
(2 trip detection logic)*
*: See page TR–13.
DIAGNOSIS CODE DETECTION DRIVING PATTERN
Purpose of the driving patten.
(a) After the diag. code is erased, the malfunction is reproduced and the diag. code is recorded again.
(b) To check that the malfunction is cleared once the repair is completed (confirm that diag. code is no
longer detected).
Malfunction: Open in EGR Gas Temp. Sensor, Loose EGR or BVSV Vacuum Hose,
For A/T Vehicle
Á
Start engine.
Â
Soon after starting the engine (no warming up), drive for 5 min. at 45–70 mph in
D range (O/D OFF) with the air conditioner ON.
(Keep the accelerator pedal position constant).
Turn the IG switch to OFF (not Acc) when you finish driving, then 30 min. later (to
cool the engine) perform , again.
ENGINE TROUBLESHOOTING
71

EGR System Malfunction (California Only)

Diagnosis
Valve Stuck Clogged EGR Gas Passage
– Circuit Inspection
Trouble Area
Open in EGR gas temp. sensor circuit
EGR or BVSV vacuum hose disconnected,
valve stuck
Clogged EGR gas passage
ECU
TR–75