HYBRID/TROUBLE SHOOTING
3–297
CHECKLIST: P3128 (TC7D)
P3128 (TC7D)
Abnormality in HV radiator fan revolution
number Low
Inspection Procedure
Step
Action
Description
Judgement
Check
(Yes/No)
Yes
No
1
Reading the
DTC [HINO-
DX]
1. Set the starter key to the
"LOCK" position.
2. Connect the diagnosis tool
(HINO-DX) to the vehicle.
3. Set the starter key to the "ON"
position.
4. Select [Hybrid] on the diagno-
sis tool screen.
5. In [Fault Information] on the
diagnosis tool screen, check if
any of the following DTC
related to malfunction of
inverter start relay is detected:
•
P324B-62, P324C-61
DTC P324B-
62 or P324C-
61 is detected:
Go to YES.
DTC P324B-
62 or P324C-
61 is not
detected: Go
to NO.
Perform trou-
bleshooting for
each of related
DTC.
Go to step 2.
2
Inspecting the
HV radiator
1. Check that the HV radiator and
the inverter cooling radiator fan
have no damage or clogging.
Defect is
found: Go to
YES.
Defect is not
found: Go to
NO.
Repair (clean)
or replace the
defective part.
Go to step 3.
3
Checking the
inverter cool-
ing radiator fan
1. Set the starter key to the "ON"
position.
2. Check that the inverter cooling
radiator fan is running.
Inverter cool-
ing radiator fan
is running: Go
to YES.
Inverter cool-
ing radiator fan
is not running:
Go to NO.
Go to step 7.
Go to step 4.
4
Inspecting the
voltage of
vehicle wire
harness
1. Set the starter key to the
"LOCK" position.
2. Disconnect the PCU harness
(24P) connector.
3. Set the starter key to the "ON"
position.
4. Using the electrical tester, mea-
sure the voltage between the
3rd terminal of PCU harness
(24P) vehicle-side connector
and the ground.
<Measurement conditions>
Starter key: ON
<Tester connections>
PCU harness (24P) vehicle-side
connector
3rd terminal
–
GND
<Standard values>
9 V or more
The mea-
sured value is
within the
range of stan-
dard value: Go
to YES.
The mea-
sured value is
not within the
range of stan-
dard value: Go
to NO.
Go to step 5.
Inspect the
power supply
circuit ([PCI-B
20A] fuse and
wire harness).