HYBRID/TROUBLE SHOOTING
3–471
4
Inspecting the
three-phase
cable 3
1. Disconnect the three-phase
cable (U, V, and W terminals)
from the inverter.
2. Using the megohm tester (500
V range), measure the insula-
tion resistance between the ter-
minals of three-phase cable.
! CAUTION
Terminals must be insulated to
avoid contact.
<Measurement conditions>
Starter key: LOCK
<Tester connections>
Three-phase cable
U terminal – V terminal
V terminal – W terminal
W terminal – U terminal
<Standard values>
10 M
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.
Replace the
three-phase
cable.
5
Inspecting the
inverter radia-
tor
1. Remove the bottom cover of
the PCU.
2. Check the inverter radiator,
inverter cooling radiator fan,
and the hose for water leakage
or clogging.
3. Check that the coolant level is
appropriate.
Defect is
found: Go to
YES.
Defect is not
found: Go to
NO.
Repair or
replace the
defective part.
After repair or
replacement,
add coolant
and go to step
6.
Go to step 6.
6
Inspecting the
inverter cool-
ing radiator fan
and inverter
cooling pump
1. Set the starter key to the "ON"
position.
2. Check the operating sound of
inverter cooling radiator fan and
inverter cooling pump.
Operating
sound is
checked: Go
to YES.
Operating
sound is not
checked: Go
to NO.
Go to step 7.
Replace the
inverter cool-
ing radiator fan
or inverter
cooling pump.
After replace-
ment, go to
step 7.
7
Reproduction
check [HINO-
DX]
1. Connect all the connectors that
have been disconnected to
restore the system.
2. Connect the diagnosis tool
(HINO-DX) to the vehicle.
3. Set the starter key to the "ON"
position.
4. Clear the malfunction history.
5. Perform a test run. (accelerate
and decelerate running for
approximately 1 hour).
6. In [Fault Information] on the
diagnosis tool screen, check if
P0A1B-16 is detected.
DTC P0A1B-
16 is detected:
Go to YES.
DTC P0A1B-
16 is not
detected: Go
to NO.
Replace the
inverter.
The inspec-
tion is com-
pleted.
P0A1B (TC16)
Abnormality in inverter (ECU system)
Inspection Procedure
Step
Action
Description
Judgement
Check
(Yes/No)
Yes
No
