Hino 238, Workshop Manual

Page: 110 / 919

ENGINE CONTROL SYSTEM (J08E) 4–887
CHECKLIST: P14BC and P14BD
DTC: P14BC
EGR valve controller temperature sensor 2
(Signal too low)
(EGR actuator temp. sensor 2 signal too low)
Inspection procedure
DTC: P14BD
EGR valve controller temperature sensor 2
(Signal too high)
(EGR actuator temp. sensor 2 signal too high)
Step Action Description Judgement
Check
(Yes/No)
Yes No
1
Check the
DTC detected
1 (Engine
ECU) [Hino-
DX]
Check if any DTC other than DTC
(P14BC or P14BD) has been
detected in [Engine].
DTC other
than DTC
(P14BC or
P14BD) has
been detected:
Go to YES.
No DTC has
been detected:
Go to NO.
Go to the diag-
nostic proce-
dure of a
related DTC.
Go to step 2.
2
Inspect the
EGR valve
connector Check the connection of the EGR
valve connector (Looseness and
poor contact).
Failure found:
Go to YES.
No failure
found: Go to
NO.
Connect
securely,
repair if
needed.
Perform "After-
inspection
work" of
INFORMA-
TION section.
Go to step 3.
3
Inspect the
EGR valve
power supply
Disconnect the EGR valve con-
nector and measure the voltage
between the terminals of the EGR
valve vehicle-side connector.
<Tester connections>
EGR valve vehicle-side connector
EGRV
–
EGRG
<Standard values>
8
–
16 V
The measure-
ments meet
the standard
value: Go to
YES.
The measure-
ments do not
meet the stan-
dard value: Go
to NO.
Replace the
EGR valve, go
to step 4.
Check the wire
harness (actu-
ator power
supply and
ground) and
battery volt-
age. Repair or
replace parts
as needed.
Perform "After-
inspection
work" of
INFORMA-
TION section.
4
Check the
DTC detected
2 (Engine
ECU) [Hino-
DX]
Check if the DTC (P14BC or
P14BD) has been detected in
[Engine].
DTC (P14BC
or P14BD) has
been detected:
Go to YES.
No DTC has
been detected:
Go to NO.
Replace the
engine ECU.
Perform "After-
inspection
work" of
INFORMA-
TION section. Procedure
completed.
Perform "After-
inspection
work" of
INFORMA-
TION section.