2001 TOYOTA PRIUS Service Repair Manual

DI±298
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Check continuity of wire harness between HV ECU and converter & inverter as-
sembly (See page IN±41).
OK:
Continuity: Less then 1 W
HV ECU TerminalsInverter Terminals
GIVAG±IVA
GIVBG±IVB
GIWAG±IWA
GIWBG±IWB
GIVGG±GINV
NG Repair or replace wire harness.
OK
2 Is there DTC P3100 being output?
YES Check applicable DTC.
NO
Replace converter & inverter assembly.

± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±299
2001 PRIUS (RM778U)
CIRCUIT DESCRIPTION
The HV ECU detects the malfunction of the generator inverter current sensor. It detects the malfunction of
the sensor system, not of the high voltage system.
DTC P3125 ± Information code 344, 345
INF. Code.Detecting ConditionTrouble Area
344Failure in monitoring generator torque performanceCt&it bl345Abnormal current value of generator
Converter & inverter assembly
INSPECTION PROCEDURE
If the information code 344 or 345 is output, check if other DTC or information codes are recorded. If they
are recorded, check and repair those codes first.
If the information code 344 or 345 alone is recorded, replace the converter & inverter assembly.

A14120
InverterHybrid Vehicle
Control ECU
G±SDOWNY 4
I1112
GSDN
H11 DI±300
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
2001 PRIUS (RM778U)
CIRCUIT DESCRIPTION
The HV ECU checks the line connection of the generator gate shutdown signal circuit and detects malfunc-
tion.
DTC P3125 ± Information code 342, 343
INF. Code.Detecting ConditionTrouble Area
342+B short in generator gate shutdown signal circuitCt&it bl
343Open or GND short in generator gate shutdown signal cir-
cuit
Converter & inverter assembly

Wire harness
WIRING DIAGRAM

± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±301
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Check for open, short and +B short in wire harness between HV ECU GSDN ter-
minal and converter & inverter assembly G±SDOWN terminals (See page
IN±41).
HINT:
Confirm that there is no open circuit in the wire harness. The generator gate shutdown signal circuit has +B
short if the battery voltage is always applied to the HV ECU GSDN terminal with the ignition ON.
NG Repair or replace wire harness.
OK
Replace converter & inverter assembly.

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

± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±303
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1Check wire harness (See page IN±41).
HINT:
After removing the IG2 relay, check the electrical condition of each terminal.

No. 1 terminal: With the IG switch ON, 10 ± 14 V

No. 2 terminal : Continuity between the IG2 relay No. 2 terminal and body ground (less than 1 W )

No. 3 terminal: Continuity between the IG2 relay No. 3 terminal and water pump No. 2 terminal (less
than 1 W )

No. 5 terminal: Always 10 ± 14 V
Continuity between the water pump No. 1 terminal and body ground (less than 1 W )
NG Repair or replace wire harness.
OK