2001 TOYOTA PRIUS Service Repair Manual

± DIAGNOSTICSENGINE
DI±17
2001 PRIUS (RM778U)
MANUFACTURER CONTROLLED:
DTC No.
(See Page)Detection ItemTrouble AreaMIL*1Memory
P1125
(DI±108)Throttle Control Motor Circuit
MalfunctionOpen or short in throttle control motor circuit
Throttle control motor
ECM

P1127
(DI±110)ETCS Actuator Power Source
Circuit MalfunctionOpen in ETCS power source circuit
ECM
P1128
(DI±112)Throttle Control Motor Lock Mal-
functionThrottle control motor
Throttle body
P1129
(DI±114)Electric Throttle Control System
MalfunctionElectric throttle control system
ECM
P1300
(DI±115)Igniter Circuit Malfunction (No.1)
Ignition system
Open or short in IGF1 and IGT1 circuit from No.1 ignition coil
with igniter to ECM
No.1 ignition coil with igniter
ECM

P1305
(DI±115)Igniter Circuit Malfunction (No.2)
Ignition system
Open or short in IGF2 and IGT2 circuit from No.2 ignition coil
with igniter to ECM
No.2 ignition coil with igniter
ECM

P1310
(DI±115)Igniter Circuit Malfunction (No.3)
Ignition system
Open or short in IGF2 and IGT3 circuit from No.3 ignition coil
with igniter to ECM
No.3 ignition coil with igniter
ECM

P1315
(DI±115)Igniter Circuit Malfunction (No.4)
Ignition system
Open or short in IGF1 and IGT4 circuit from No.4 ignition coil
with igniter to ECM
No.4 ignition coil with igniter
ECM

P1346
(DI±120)VVT Sensor/Camshaft Position
Sensor Circuit Range/Perfor-
mance Problem (Bank 1)Mechanical system (Jumping teeth of timing belt, belt
stretched)
ECM

P1349
(DI±121)VVT System Malfunction (Bank
1)
Valve timing
OCV
VVT controller assembly
ECM

P1430
(DI±127)Vacuum Sensor for Adsorber
and Catalyst System Circuit Mal-
functionOpen or short circuit in vacuum sensor circuit
Vacuum sensor for HC adsorber and catalyst system
ECM

P1431
(DI±131)Vacuum Sensor for Adsorber
and Catalyst System CIrcuit
Rangel Performance ProblemVacuum sensor for HC adsorber and catalyst system
Vacuum line
P1436
(DI±133)Variable Value Malfunction
Vacuum line
Actuator for HC adsorber and catalyst system
Front exhaust pipe

P1437
(DI±135)Vacuum Line Malfunction
Vacuum line
VSV for HC adsorber and catalyst system
Check valve


DI±18
± DIAGNOSTICSENGINE
2001 PRIUS (RM778U)P1455
(DI±140)
Vapor Reducing Fuel Tank Sys-
tem Leak Detected (Small Leak)
Hose and pipe
Heated oxygen sensor
Fuel system
VVT system
Ignition system
Mass air flow meter
ECM

P1525
(DI±141)Resolver Circuit
MalfunctionHV ECU
Engine ECU±
P1600
(DI±143)ECM BATT MalfunctionOpen in back up power source circuit
ECM
P1633
(DI±145)ECU Malfunction (ETCS Circuit)ECM
P1636
(DI±146)HV ECU MalfunctionHV ECU
Engine ECU
P1637
(DI±148)EGSTP Signal MalfunctionHV ECU
Engine ECU±
P1656
(DI±150)OCV Circuit Malfunction (for
VVT±i)Open or short in OCV circuit
OCV
ECM

P3190
(DI±153)Poor Engine Power
Air induction system
Throttle body
Fuel pressure
Engine
Mass air flow meter

P3191
(DI±153)Engine dose not start
Mass air flow meter
Out of fuel
Engine coolant temp. sensor
Crankshaft position sensor
Camshaft position sensor
ECM
*1: 


MIL lights up

DI7SS±01
F02094
E7 E8 E9 E10
DI±20
± DIAGNOSTICSENGINE
2001 PRIUS (RM778U)
TERMINALS OF ECM
Symbols (Terminal No.)Wiring ColorConditionSTD Voltage (V)
BATT (E8 ± 3) ± E1 (E8 ± 17)R±W eBRAlways9 ± 14
+B (E8 ± 4) ± E1 (E8 ± 17)B e BRIG switch ON9 ± 14
+BM (E7 ± 6) ± E1 (E8 ± 17)GR e BRAlways9 ± 14
IGSW(E10 ± 9) ± E1(E8 ± 17)B±W e BRIG switch ON9 ± 14
MREL (E9 ± 25)
± E1(E8 ± 17)G±R e BRIG switch ON9 ± 14
VC (E8 ± 2) ± E2 (E8 ± 18)Y±R e BRIG switch ON4.5 ± 5.5
VTA (E8 23) E2 (E8 18)PBR
IG switch ON
Throttle valve fully closed0.4 ± 1.0
VTA (E8 ± 23) ± E2 (E8 ± 18)Pe BRIG switch ON
Throttle valve fully open3.2 ± 4.8
VTA2 (E8 21) E2 (E8 18)LBR
IG switch ON
Accelerator pedal released2.0 ± 2.9
VTA2 (E8 ± 21) ± E2 (E8 ± 18)Le BRIG switch ON
Accelerator pedal depressed4.6 ± 5.1
VG (E8 ± 10) ± EVG (E8 ± 19)G eRIdling, A/C switch OFF, Shift position in N or P position0.5 ± 3.0
THA (E8 ± 22) ± E2 (E8 ± 18)R±B eBRIdling, Intake air temp. 20°C (68°F)0.5 ± 3.4
THW (E8 ± 14) ± E2 (E8 ± 18)W eBRIdling, Engine coolant temp. 80°C (176°F) 0.2 ± 1.0
IG switch ON9 ± 14
#10 (E8 ± 5) ± E01 (E7 ± 21)Y eW±BIdlingPulse generation
(See page DI±65)
IG switch ON9 ± 14
#20 (E8 ± 6) ± E01 (E7 ± 21)B±R eW±BIdlingPulse generation
(See page DI±65)
IG switch ON9 ± 14
#30 (E7 ± 1) ± E01 (E7 ± 21)L±W eW±BIdlingPulse generation
(See page DI±65)
IG switch ON9 ± 14
#40 (E7 ± 2) ± E01 (E7 ± 21)R±W eW±BIdlingPulse generation
(See page DI±65)
IGT1 (E7 ± 11) ± E1 (E8 ± 17)Y±G eBRIdlingPulse generation
(See page DI±115)
IGT2 (E7 ± 12) ± E1 (E8 ± 17)W eBRIdlingPulse generation
(See page DI±115)
IGT3 (E7 ± 13) ± E1 (E8 ± 17)G eBRIdlingPulse generation
(See page DI±115)