2001 TOYOTA PRIUS O2 sensor

± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±307
2001 PRIUS (RM778U)
DTC P3140 Interlock Malfunction
CIRCUIT DESCRIPTION
If the HV ECU detects the operation of the safety devices (removal of the service plug, inverter terminal cover
and sensor cover) while the vehicle is not running (with the vehicle is stopped), it will shut down the system
main relay. It the safety devices are correctly installed, it will resume the normal operation after the power
source is supplied again. If it does not, there is a possibility of an open circuit, so perform the same inspection
as the information code 351.
HINT:

When using an OBD scan tool other than TOYOTA hand±held tester, check all the steps.

When using TOYOTA hand±held tester, confirm the information code and check it.
DTC P3140 ± Information code 350
INF. code.Detecting ConditionTrouble Area
350Safety devices operating with vehicle is stopped (ILK signal
ON)±
DI83B±02

± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±309
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Check installation condition of inverter terminal cover and sensor cover.
NG Install them correctly.
OK
2 Check continuity of wire harness between interlock switch No. 1 terminal and HV
ECU ILK terminal and interlock switch No. 2 terminal and inverter CVRSW termi-
nal (See page IN±41).
OK:
Continuity: Less than 1 W
NG Repair or replace wire harness.
OK
3 Check continuity between inverter CVRSW terminal and body ground
(See page IN±41).
OK:
Continuity: Less than 1 W
NG Replace converter & inverter assembly.
OK
Confirm that interlock switch is defective and replace it.
Check interlock switch (See page HV±38)

A14138
2A C10
Combination
MeterHybrid Vehicle
Control ECU
L
H12 19
SPDI 68
IE1
13Instrument
Panel J/B
7
2BV±WJ/C
G
J27G
J28V±W V±W DI±310
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
2001 PRIUS (RM778U)
DTC P3145 Vehicle Speed Sensor Circuit Malfunction
CIRCUIT DESCRIPTION
DTC P3145 ± Information code 352
INF. code.Detecting ConditionTrouble Area
352No input of vehicle speed signal during cruise control driving
Wire harness
WIRING DIAGRAM
DI83C±02

DI±332
± DIAGNOSTICSHV BATTERY CONTROL SYSTEM
2001 PRIUS (RM778U) 4/27/01
DTC P3009 Leak Detected
CIRCUIT DESCRIPTION
Electric leak from the high±voltage system, which may seriously harm the human body, is detected by this
code.
DTC No.DTC Detecting ConditionTrouble Area
P3009Electric leak from high±voltage system
(Insulating resistance of power cable is 100 kW or less.)

Power cable

HV transaxle

Converter & inverter assembly

Battery cover

System main relay

Battery temperature sensor

Battery ECU

Battery carrier catch bracket

Main battery cable

Service plug assembly

HV battery assembly
INSPECTION PROCEDURE
1 Is DTC P3125 of HV ECU being output?
YES Go to relevant DTC chart.
NO
2 Are there any other codes (Desides DTC P3009) being output?
YES Go to relevant DTC chart.
NO
DI82A±01

DI±338
± DIAGNOSTICSHV BATTERY CONTROL SYSTEM
2001 PRIUS (RM778U) 4/27/01
11 Check insulating resistance of service plug assembly.
PREPARATION:
Under step 9 condition, disconnect the cable terminal of the service plug assembly from the HV battery.
CHECK:
Using a megger (500V), measure the insulating resistance between 2 cable terminals and body ground.
OK:
Insulating resistance: 10MW or more
NG Replace the service plug assembly.
OK
12 Check insulating resistance of HV battery temperature sensor.
PREPARATION:
Under step 10 condition, disconnect the HV battery temperature sensor connector from the battery ECU.
CHECK:
Using a megger (500V), measure the insulating resistance between each terminal of the HV battery temper-
ature sensor and body ground.
OK:
Insulating resistance: 10MW or more
NG Replace the HV battery temperature sensor.
OK

A14077
Battery ECU
GR ± B Busbar Module
14
V ± Y 2
GR 15
O3
LG ± B 16
L ± O 4
LG 17
P5
Y ± B 18
L ± W 6
L7
LG ± R 20
Y8
P ± L 21
G9
L ± R 22
G ± W 10
R23
W11
L ± B 24VBB1
VBB2
VBB3
VBB4
VBB5
VBB6
VBB7
VBB8
VBB9
VBB10
VBB11
VBB12
VBB13
VBB14
VBB15
VBB16
VBB17
VBB18
VBB19
GBB19 DI±344
± DIAGNOSTICSHV BATTERY CONTROL SYSTEM
2001 PRIUS (RM778U) 4/27/01
DTC P3030 Battery Voltage Detective line Snapped
CIRCUIT DESCRIPTION
A voltage sensor set in a busbar module circuit measures a voltage of a pair of battery modules and sends
signals to the battery ECU.
DTC No.DTC Detecting ConditionTrouble Area
P3030Open in battery voltage detective line

Battery ECU

Open in battery voltage detective line

Wire harness, Busbar module
WIRING DIAGRAM
DI82D±01

A13557
Battery Temperature SensorBattery ECU
TB1 1
L
B
W
R
G2
3
4
5
6
7
9
10 8TB2
TB3
TB4 GB1
GB2
GB3
GB4
TB5
GB5 L
B
W
R
G DI±348
± DIAGNOSTICSHV BATTERY CONTROL SYSTEM
2001 PRIUS (RM778U)
DTC P3060 Battery Temperature sensor Circuit Malfunc-
tion
CIRCUIT DESCRIPTION
A thermistor in the sensor set in a battery pack changes its resistance according to battery bemperature.
As the battery temperature falls or rises, the resistance rises or falls accordingly.
DTC No.DTC Detecting ConditionTrouble Area
P3060

Open or short in battery temperature sensor circuit

Battery temperature sensor circuit range/performance prob-
lem
Battery temperature sensor

Connector and wire harness
WIRING DIAGRAM
DI82E±01

± DIAGNOSTICSHV BATTERY CONTROL SYSTEM
DI±349
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Are there any other codes (besides DTC P3060) being output?
YES Go to relevant DTC chart.
NO
2 Check resistance of battery temperature sensor.
PREPARATION:
(a) Remove the battery cover (See page HV±5).
(b) Disconnect the battery temperature sensor connector.
CHECK:
Using an ohmmeter, measure the resistance between terminals.
OK:
Standard resistance:
TerminalsResistance (at 25 °C (77°F)
1 ± 29 ± 11 kW
3 ± 49 ± 11 kW
5 ± 69 ± 11 kW
7 ± 89 ± 11 kW
9 ± 109 ± 11 kW
NG Replace the battery temperature sensor.
OK
Check fitting of battery temperature sensor
connector and correct if necessary.