2001 TOYOTA PRIUS overheating

DI±278
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
2001 PRIUS (RM778U)
CIRCUIT DESCRIPTION
DTC P3125 ± Information code 284, 286, 287
INF. Code.Detecting ConditionTrouble Area
284Inverter overheating
286Inverter circuit broken
Converter & inverter assembly
287Inverter internal short
Converter & inverter assembly
INSPECTION PROCEDURE
If the information code 284 or 287 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 284 or 287 alone is recorded, replace the converter & inverter assembly.
If the information code 286 is output, replace the converter & inverter assembly.

A14121
InverterHybrid Vehicle Control ECU
M±INVTL 5
I11
6
I11 M±GINVB23
GIT
GIVG 27
H11H11
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±289
2001 PRIUS (RM778U)
CIRCUIT DESCRIPTION
The HV ECU checks the generator temperature and controls the load limitation in order to prevent the gener-
ator from overheating. Also, it detects the abnormality of the line connection of the generator temperature
sensor and the malfunction of the sensor itself.
DTC P3125 ± Information code 312, 313, 314, 315
INF. Code.Detecting ConditionTrouble Area
312Open or +B short in generator inverter temperature sensor
313GND short in generator inverter temperature sensorCt&it bl314Generator inverter temperature sensor malfunction
Converter & inverter assembly

Wire harness
315Generator inverter temperature sensor performance prob-
lem

Wire harness
WIRING DIAGRAM

DI±294
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Check for open, short and +B short in wire harness between HV ECU GFIV and
GIVG terminals and converter & inverter assembly G±FINV and G±GINV terminals
(See page IN±41).
HINT:
The generator inverter fail signal circuit has +B short if the voltage between the HV ECU GFIV or GIVG termi-
nal and body ground is always more than 13 V with the ignition ON (ºREADYº light OFF).
NG Repair or replace wire harness.
OK
Replace converter & inverter assembly.
CIRCUIT DESCRIPTION
DTC P3125 ± Information code 322, 324, 325
INF. Code.Detecting ConditionTrouble Area
322Inverter overheating
324Inverter circuit broken
Converter & inverter assembly
325Inverter internal short
Converter & inverter assembly
INSPECTION PROCEDURE
If the information code 322 or 325 is output, check if other information codes are recorded. If they are re-
corded, check and repair those codes first.
If the information code 322 or 325 alone is recorded, replace the converter & inverter assembly.
If the information code 324 is output, replace the converter & inverter assembly.

AC2810
AC0Y9±05
AC2811
N11084
Wrong Okay
HI LO HILO
± AIR CONDITIONINGAIR CONDITIONING SYSTEM
AC±1
1889 Author: Date:
2001 PRIUS (RM778U)
AIR CONDITIONING SYSTEM
PRECAUTION
1. DO NOT HANDLE REFRIGERANT IN AN ENCLOSED
AREA OR WEAR A NAKED FLAME
2. ALWAYS WEAR EYE PROTECTION
3. BE CAREFUL NOT TO GET LIQUID REFRIGERANT IN
YOUR EYES OR ON YOUR SKIN
If liquid refrigerant gets in your eyes or on your skin.
(a) Wash the area with lots of cool water.
CAUTION:
Do not rub your eyes or skin.
(b) Apply clean petroleum jelly to the skin.
(c) Go immediately to a physician or hospital for professional
treatment.
4. NEVER HEAT CONTAINER OR EXPOSE IT TO NAKED
FLAME
5. BE CAREFUL NOT TO DROP CONTAINER AND NOT
TO APPLY PHYSICAL SHOCKS TO IT
6. DO NOT OPERATE COMPRESSOR WITHOUT
ENOUGH REFRIGERANT IN REFRIGERATION SYS-
TEM
If there is not enough refrigerant in the refrigerant system oil lu-
brication will be insufficient and compressor burnout may occur,
so that care to avoid this, necessary care should be taken.
7. DO NOT OPEN PRESSURE MANIFOLD VALVE WHILE
COMPRESSOR IS OPERATE
If the high pressure valve is opened, refrigerant flows in the re-
verse direction and could cause the charging cylinder to rup-
ture, so open and close the only low pressure valve.
8. BE CAREFUL NOT TO OVERCHARGE SYSTEM WITH
REFRIGERANT
If refrigerant is overcharged, it causes problems such as insuffi-
cient cooling, poor fuel economy, engine overheating etc.