DI
−
80
−
DIAGNOSTICS
ENGINE
1996 LAND CRUISER (RM451U)
DTC
P0402
Exhaust Gas Recirculation Flow Excessive
Detected
CIRCUIT DESCRIPTION
Refer to DTC P0401 (Exhaust Gas Recirculation Flow Insufficient Detected) on page
DI
−
69
.
DTC No.
DTC Detecting Condition
Trouble Area
P0402
EGR gas temp. sensor value is high during EGR cut
−
off when
engine is cold (Race engine at about 4,000 rpm without load so
that vacuum is applied to port E)
(2 trip detection logic)
S
EGR valve stuck open
S
EGR VSV open malfunction
S
Open in VSV circuit for EGR
S
Short in EGR gas temp. sensor circuit
S
ECM
EGR valve is always open (2 trip detection logic)
Refer to DTC P0401 (Exhaust Gas Recirculation Flow Insufficient Detected) for the System Check Driving
Pattern and Wiring Diagram.
INSPECTION PROCEDURE
TOYOTA hand
−
held tester
1
Connect the TOYOTA hand
−
held tester and read EGR gas temp. value.
PREPARATION:
(a)
Remove the fuse cover on the instrument panel.
(b)
Connect the TOYOTA hand
−
held tester to the DLC3.
(c)
Turn 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 Approx. 157.5
°C (315.5°F).
OK
Go to step 4.
NG
DI5PL
−
02
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