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05–485
DIAGNOSTICS
–
HYBRID CONTROL SYSTEM
05J9C–01
DTC
P0A09/591 DC/DC CONVERTER STATUS CIRCUIT LOW
INPUT
DTC
P0A10/592 DC/DC CONVERTER STATUS CIRCUIT HIGH
INPUT
CIRCUIT DESCRIPTION
See the description of the DC/DC converter on page 05–483 .
The HV control ECU sends the output voltage switch signal to the DC/DC converter via the VLO signal line
in order to switch output voltage according to vehicle status.
If the vehicle is being driven with an inoperative DC/DC converter, the voltage of the auxiliary battery will drop,
which will prevent the continued operation of the vehicle. Therefore, the HV control ECU monitors the opera-
tion of the DC /DC converter and alerts the driver if it detects malfunction.
DTC No.
INF Code
DTC Detection Condition
Trouble Area
Open or GND short in VLO signal circuit of DC/DC
converter
Wire harness or connector
w/ converter inverter assembly
P0A09
591
Wire harness or connector
w/ converter inverter assembly
P0A10
592
+B short in VLO signal circuit of DC/DC converter
WIRING DIAGRAM
DC/DC Converter
HV Control ECU
5
C5
31
H16 VLO
L
VLO
A92298
2004 Prius – Preliminary Release (RM1075U)
Author:
Date:
649
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05–486
DIAGNOSTICS
–
HYBRID CONTROL SYSTEM
INSPECTION PROCEDURE
1
CHECK HARNESS AND CONNECTOR(HYBRID VEHICLE CONTROL ECU – DC/DC
CONVERTER)
(a)
Disconnect the H16 HV control ECU connector.
(b)
Disconnect the C5 DC/DC converter connector.
H16
(c)
Turn the power switch ON (IG).
(d)
Measure the voltage between the terminal of the HV con-
trol ECU connector and body ground.
Standard:
Tester Connection
Specified Condition
VLO
VLO (H16–31) – Body ground
Below 1V
HV Control ECU Connector
(e)
Turn the power switch OFF.
A65745
(f)
Check the resistance between the wire harness side con-
nectors.
Standard (Check for open):
Tester Connection
Wire Harness Side:
C5
Specified Condition
VLO (H16–31) – VLO (C5–5)
Below 1 W
Standard (Check for short):
Tester Connection
VLO
Specified Condition
Front View
VLO (H16–31) or VLO (C5–5) – Body ground
10 k
W
or higher
DC/DC Converter Connector
(g) Reconnect the DC/DC converter connector.
(h) Reconnect the HV control ECU connector.
NG
A92030
REPAIR
OR
REPLACE
HARNESS
OR
CONNECTOR
OK
REPLACE W/CONVERTER INVERTER ASSY (See page 21–23 )
2004 Prius – Preliminary Release (RM1075U)
Author:
Date:
650
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