engine TOYOTA PRIUS 2001 Service Repair Manual

A14150
H12Hybrid Vehicle
Control ECU
10 21
GO G 9
IA2 G
E9 GO ECM
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±229
2001 PRIUS (RM778U)
DTC P3100 HV ECU Malfunction
CIRCUIT DESCRIPTION
The HV ECU compares Ne signal with G signal that are sent from the ECM and checks whether the engine
rpm signal is correct or not.
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 P3100 ± Information code 136, 137
INF. Code.Detecting ConditionTrouble Area
136Open or short in GO signal circuit
Wire harness

ECM
137Engine speed sensor malfunction

ECM

Crankshaft position sensor

Camshaft position sensor
WIRING DIAGRAM
DI82Y±02

A14148
Hybrid Vehicle
Control ECU
Instrument Panel J/BI15
Ignition SW
Engine Room J/BFusible Link
Block No. 1ST2 R±W6
H13 2C2
W±R
2G2
W±R
1J9AM2
B
B±G
MAIN
Battery1B2
F121
F131
B±G
F181 Fusible Link
Block No. 2
ST2 AM27
8
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±233
2001 PRIUS (RM778U)
CIRCUIT DESCRIPTION
The HV ECU checks the ST signal and detects malfunction. If the ST signal has +B short, the ST will always
be ON. Therefore, even with the IG ON when starting the THS, the system will start. To prevent this from
happening, the HV ECU detects the malfunction of the ST signal.
DTC P3100 ± Information code 142
INF. Code.Detecting ConditionTrouble Area
142When ST signal of HV ECU is ON, with ignition switch
turned OFF.
Wire harness

HV ECU

Ignition switch
WIRING DIAGRAM

A14737
Hybrid Vehicle
Control ECU Engine Room R/B No. 2
Fusible Link
Block No. 1
Battery+B1
MREL 4
H14
1FG±Y
W±G
O 2
7
H12 W±G12
IA1
2 2
2
213 5
Engine
Room J/B 11
HV
F12B±GMAIN 1B 1
B
F13Fusible Link
Block No. 2
1
F18 A
J7
J/C
W±B
IE
EC W±B W±B
AJ1
J/C
AA IGCT Relay
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±247
2001 PRIUS (RM778U)
DTC P3110 IGCT Relay Malfunction
CIRCUIT DESCRIPTION
The HV ECU checks the IGCT relay and detects malfunction.
DTC P3110 ± Information code 223
INF. Code.Detecting ConditionTrouble Area
223
When IGCT relay is always closed.
Wire harness

IGCT relay
WIRING DIAGRAM
DI835±02

S04947S04946
A14712
12
35
12
35
Ohmmeter
Battery Continuity
Ohmmeter
Ohmmeter
ContinuityNo Continuity
DI±248
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Check IGCT relay.
PREPARATION:
Remove the IGCT relay from the engine room R/B No. 3.
CHECK:
(a) Using an ohmmeter, check that there is continuity be-
tween terminals 1 and 2.
(b) Check that there is no continuity between terminals 3 and
5.
(c) Apply battery voltage across terminals 1 and 2. Using an
ohmmeter, check that there is continuity between termi-
nals 3 and 5.
OK:
(a) Continuity
(b) No continuity
(c) Continuity
NG Replace IGCT relay.
OK
Check for +B short in wire harness between HV ECU and IGCT relay (See page IN±41).
Repair or replace wire harness.
HINT:
The HV ECU MREL terminal has +B short if the battery voltage is always applied to the HV ECU +B1 or MREL
terminal with the ignition OFF.

A14736
BatteryMAINB±G 1
1
F18 1 1
5
1
F132 3 2
2Engine Room J/B
W±B IK1 2
14
5
AM2 B±WB±W
B±W I15
Ignition SW W±R
6 711
IG2 AM2
Instrument Panel J/B
2C
1K 1A 2G9
1J
1B
B
F12IG2 Relay
Fusible Link
Block No. 1
Fusible Link
Block No. 2 1J
2G
2BW±R
13 3
IE AA AB±W
2
W±B W±B
W±BW3
Water
Pump
Motor
J1
J/C J7
J/C W±B DI±302
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
2001 PRIUS (RM778U)
DTC P3130 Inverter Cooling System Malfunction
CIRCUIT DESCRIPTION
The HV ECU checks the operation of the inverter water pump and detects malfunction.
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 P3130 ± Information code 346
INF. code.Detecting ConditionTrouble Area
346Water pump system malfunction

Inverter water pump

IG2 relay

Wire harness
WIRING DIAGRAM
DI839±02

S04947S04946
A14712
Continuity
OhmmeterOhmmeter
No Continuity 2
1
5
3
Ohmmeter
Continuity2
1
5
3
Battery
DI±304
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
2001 PRIUS (RM778U)
2 Check IG2 relay.
PREPARATION:
Remove the IG2 relay from the engine room J/B.
CHECK:
(a) Using an ohmmeter, check that there is continuity be-
tween terminals 1 and 2.
(b) Check that there is no continuity between terminals 3 and
5.
(c) Apply battery voltage across terminals 1 and 2. Using an
ohmmeter, check that there is continuity between termi-
nals 3 and 5.
OK:
(a) Continuity
(b) No continuity
(c) Continuity
NG Replace IG2 relay.
OK
Confirm that water pump is defective and then replace it.
Check water pump (See page HV±26).
CIRCUIT DESCRIPTION
DTC P3130 ± Information code 347
INF. code.Detecting ConditionTrouble Area
347Electric cooling fan system malfunction
Electric cooling fan system
INSPECTION PROCEDURE
If this information code is output, check the electric cooling fan system (See page CO±20).

± 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

Verification Results of Warning Light
Engine
HV
INF. code
HV battery
Vehicle Verification Results
( ) ON ( ) OFF
( ) engine ( ) HV
( ) HV battery
( ) output control warning light
( ) brake ( ) ABS ( ) charge ( ) PS
( ) others
( )Verification Results of Diagnostic Code
Brake
PS
Vehicle Inspection Results (Verification items, reason to identify/presume the cause parts, etc.)
Replacement Parts
problem parts: No/Yes (Sending date: . . )Duplication Status
( ) always
( ) sometimes
( ) no reproduction
Confirmation Results
After Repair
( ) Normal
( ) reproduction
( ) others ( )
DI±314
± DIAGNOSTICSHV BATTERY CONTROL SYSTEM
2001 PRIUS (RM778U)

DI824±01
A14078
Engine Room J/B
Fusible Link Block No. 1
Fusible Link Block No. 2
BatteryBattery ECU
1
1B
B
MAINB±GG±YJ2 J/C
11
1F
1
F121
F135
IH11
B17 HV
1
F18G±Y G±Y
BBAM
± DIAGNOSTICSHV BATTERY CONTROL SYSTEM
DI±323
2001 PRIUS (RM778U)
CIRCUIT INSPECTION
DTC P1600 Back Up Power Source Circuit Malfunction
CIRCUIT DESCRIPTION
Battery positive voltage is supplied to terminal AM of the Battery ECU even when the ignition switch is OFF
to read the DTC memory and freeze frame data adaptive control value memory, etc.
DTC No.DTC Detecting ConditionTrouble Area
P1600Open in back up power source circuit
Open in back up power source circuit

Battery ECU
HINT:
If DTC P1600 appears, the Battery ECU does not store any other DTC.
WIRING DIAGRAM