Hino 238, Workshop Manual

Page: 236 / 919

ENGINE CONTROL SYSTEM (J08E) 4–1013
CHECKLIST: P2138
DTC: P2138 Accelerator pedal position sensor - rationality Inspection procedure
Step Action Description Judgement
Check
(Yes/No)
Yes No
1
Check the
DTC detected
(Engine ECU)
[Hino-DX] Check if any DTC other than
P2138 (for example, P2122,
P2123, P2127, P2128) has been
detected in [Engine].
DTC other
than P2138
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
PTO accelera-
tor sensor
Check that the GND circuit of the
PTO accelerator sensor is con-
nected to the appropriate har-
ness.
Failure found:
Go to YES.
No failure
found: Go to
NO.
Repair the
GND circuit of
the PTO accel-
erator sensor.
Perform "After-
inspection
work" of
INFORMA-
TION section.
Go to step 3.
3
Inspect the
accelerator
sensor con-
nector
Check the connection of the
accelerator 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 4.
4
Inspect the
accelerator
sensor signal
Connect the signal check har-
ness, and measure the voltage
between the terminals of the
engine ECU (signal check har-
ness) and ground.
<Tester connections>
Engine ECU (signal check har-
ness)
ACS1(V47)
–
Ground
ACS2(V67)
–
Ground
<Standard values>
Difference in voltage between ter-
minals: 0.4
–
1.2 V
The measure-
ments meet
the standard
value: Go to
YES.
The measure-
ments do not
meet the stan-
dard value: Go
to NO.
Go to step 5.
Replace the
sensor.
Perform "After-
inspection
work" of
INFORMA-
TION section.