Hino 238, Workshop Manual

Page: 593 / 919

DEF SCR SYSTEM (DCU) 5–27
CHECKLIST: P0071
DTC: P0071 Ambient air temperature sensor - rationality Inspection Procedure
Step Action Description Judgement
Check
(Yes/No)
Yes No
1
Inspect the
ambient air
temperature
sensor con-
nector
Check the connection of the
ambient air temperature sensor
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 2.
2
Inspect the
connector of
the external
resistor
Check the connection of the
external resistor 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
DCU 86P con-
nector Check the connection of the DCU
86P 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 4.
4
Inspect the
ambient air
temperature
sensor
1. Check the installation of the
ambient air temperature
sensor.
2. Make sure there is no dirt or
damage to the ambient air
temperature sensor.
Failure found:
Go to YES.
No failure
found: Go to
NO.
Clean the
ambient air
temperature
sensor and
install it prop-
erly.
If damaged,
replace the
ambient air
temperature
sensor.
Perform "After-
inspection
work" of
INFORMA-
TION section.
Go to step 5.