2001 TOYOTA PRIUS Service Repair Manual

DI±306
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Check for open, short and +B short in wire harness between circuit breaker sen-
sor No. 1 and No. 2 terminals and HV ECU AS1G and AS1 terminals
(See page IN±41).
HINT:
Confirm that there is no open circuit in the wire harness. The circuit breaker sensor circuit has +B short if
the voltage of the HV ECU AS1 terminal is more than 5V with the ignition ON.
NG Repair or replace wire harness.
OK
Check for open in resistance between circuit breaker sensor terminals and then replace circuit
breaker sensor (Circuit breaker sensor resistance: 820 ± 82 W).

± 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

A14141
Inverter
1 2 IH1 CVRSWHybrid Vehicle
Control ECU
V±R
H13 10
ILK 6
4
004
IF1 V±R
I10I17
Interlock
SW DI±308
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
2001 PRIUS (RM778U)
CIRCUIT DESCRIPTION
The HV ECU records the information code 351 and gives warning to the driver when it detects an open circuit
in the interlock signal circuit while the vehicle is running. In this case, it does not shut down the high voltage
system.
DTC P3140 ± Information code 351
INF. code.Detecting ConditionTrouble Area
351Open circuit in interlock signal circuit while vehicle is running

Interlock switch

Inverter terminal cover

Converter & inverter assembly

Wire harness
WIRING DIAGRAM

± 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

± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±311
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Is DTC P0500 of engine ECU being output?
YES Check DTC P0500.
NO
Check continuity of wire harness between J26 J/B G terminal and HV ECU SPDI terminal
and repair wire harness.

DI2VS±03
Prius Problem Check Sheet
Vehicle
Specifications
Please fill in the blanks within bold frame.Name of DealerPerson in Charge at
HeadquartersPerson in Charge
at Dealer
Model CodeOffice
Vehicle Delivery Date
Frame No.
Unit No. etc.
Option . . . :
( ) Navigation (equipped by ( ) MOP ( ) dealer) ( ) Cold climate specification
( ) others( )Problem Occurrence Date
Service Entry Date NHW11±
. .
. .Odometer Reading
Registration datekm
. .
Contents of complaint (Status when and before/after occurring in
the order of events as correct as possible)Characteristics of Customer
Gender
Age
Occupation
Vehicle used before
Main use area
Frequency in use
Others times/day or
week or month
Status of engineOthers
Interview Results
( ) Male ( ) Female
suburbs ( ) %
Others ( ) ( ) %
city area ( ) %
mountain area ( ) %
Driving ConditionRoad Condition
Vehicle Condition
Vehicle Speed
km/h
mph
( ) when starting
( ) when according
( ) When
normal driving
( ) when
decelerating
( ) when braking
( ) when shopping
( ) when parking
( ) when turning
( ) when
ABS actuating
( ) others
( )( ) flat road
( ) up hill ( ) down
hill incline of
° /%
distance
km
mph
( ) dry paved road
( ) wet paved road
( ) rough paved road
( ) unpaved road
( ) snowy/frozen
road
( ) bump/curb
( ) others
( )( ) when starting
( ) right after
starting
( ) until min.
after starting
( ) until min.
after starting
of driving
( ) when shopping
system
( ) while shopping
engine
( ) when starting
engine
( ) when revolving
engineHV Battery
indication
( ) 4/4 ( ) 3/4
( ) 2/4 ( ) 1/4
( ) unidentified
Shift position
(indication)
( ) P ( ) R ( ) N
( ) D ( ) B
( ) when operating
"Weather:
A/C status
( ) no indication
( ) unidentified
( ) A/C ( ) FULL
( ) OFF
( ) unidentifiedWarning light
(MIL)
( ) ON ( ) OFF
( ) PS
( ) main battery
( ) HV!
( ) engine
( ) charge
( ) output
control
( ) brake
( ) ABS
( ) others
( )
Temperature:
°C
Brake operation
( ) brake slowly
( ) Brake suddenly
( ) use two pedals
system
Frequency in
occurrence
( ) always
( ) sometimes
( ) only once
miles
°F
Fuel level
( ) segments
± DIAGNOSTICSHV BATTERY CONTROL SYSTEM
DI±313
2001 PRIUS (RM778U)
CUSTOMER PROBLEM ANALYSIS CHECK