HYBRID/TROUBLE SHOOTING
3–128
CHECKLIST: P0A07 (TC7E)
P0A07 (TC7E)
HV water pump drive signal High abnormality
Inspection Procedure
Step
Action
Description
Judgement
Check
(Yes/No)
Yes
No
1
Inspecting the
signal line of
PCU wire har-
ness (lower
side) for short
circuit
1. Set the starter key to the
"LOCK" position.
2. Disconnect the inverter cooling
pump and the HV ECU2 con-
nectors.
3. For the 3rd terminal of inverter
cooling pump connector,
inspect the signal line of PCU
wire harness (lower side) for
short circuit. (See "Inspecting
the PCU harness signal line for
short circuit.")
<Measurement conditions>
Starter key: LOCK
<Tester connections>
Inverter cooling pump connector
3rd terminal
–
Each signal line
<Standard values>
10 k
or more
Defect is
found: Go to
YES.
Defect is not
found: Go to
NO.
Replace the
PCU wire har-
ness (lower
side).
Replace the
inverter cool-
ing pump.
After replace-
ment, go to
step 2.
2
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. Set the starter key to the
"LOCK" position and wait for 1
minute.
6. Set the starter key to the "ON"
position and wait for 1 minute.
7. In [Fault Information] on the
diagnosis tool screen, check if
P0A07-7E is detected.
DTC P0A07-
7E is detected:
Go to YES.
DTC P0A07-
7E is not
detected: Go
to NO.
Replace the
HV ECU.
The inspec-
tion is com-
pleted.
