Circuit Description - Toyota 1 MZ–FE Manual

DTC P0402 Exhaust Gas Recirculation Flow
Excessive Detected

CIRCUIT DESCRIPTION

Refer to Exhaust gas recirculation flow insufficient detected on page EG2–512.
Diagnostic Trouble Code Detecting Condition
DTC No.
EG R gas temp. sensor value is high during EG R
cut–off when engine is cold (Race engine at
about 4,000 rpm without load so that vacuum is
applied to port E).
P0402
(2 trip detection logic)
EG R valve is always open
(2 trip detection logic)
See DTC P0401 for System Check Driving Pattern and Wiring Diagram.
1MZ–FE ENGINE – CIRCUIT INSPECTION
EGR valve stuck open
EGR VSV open malfunction
Open in EGR VSV circuit
Short in EGR gas temp. sensor circuit
ECM
Trouble Area
EG2–527