Exhaust Gas Recirculation Flow Excessive Detected - Toyota T100 1996 Service Manual

DI−82
DTC P0402
CIRCUIT DESCRIPTION
Refer to DTC P0401 on page DI−72.
DTC No.
EGR gas temp. sensor value is high during EGR cut−off when
engine is cold and vacuum is applied to port E
P0402
(2 trip detection logic)
EGR valve is always open (2 trip detection logic)
WIRING DIAGRAM
Refer to DTC P0401 on page DI−72.
SYSTEM CHECK DRIVING PATTERN
Refer to DTC P0401 on page DI−72.
INSPECTION PROCEDURE
TOYOTA hand−held tester:
1 Connect TOYOTA hand−held tester and read EGR gas temp. value.
PREPARATION:
(a) Connect the TOYOTA hand−held tester to the DLC3.
(b) Turn the ignition switch ON and push the TOYOTA hand−held tester main switch ON.
CHECK:
Read EGR gas temp. on the TOYOTA hand−held tester.
OK:
EGR gas temp.: 150°C (302°F) or less (Not immediately after driving)
HINT:
If there is a short circuit, the TOYOTA hand−held tester indicates 159.3°C (318.7°F).
NG
1996 TOYOTA T100 (RM449U)
DIAGNOSTICS
Exhaust Gas Recirculation Flow Excessive
Detected
DTC Detecting Condition
OK
− ENGINE (3RZ−FE)
S EGR valve stuck open
S VSV for EGR open malfunction
S Open in VSV circuit for EGR
S Short in EGR gas temp. sensor circuit
S ECM
Go to step 4.
Trouble Area
DI0TV−03