2001 TOYOTA PRIUS fuel type

± INTRODUCTIONTERMS
IN±49
49 Author: Date:
2001 PRIUS (RM778U) N
Neutral
NANatural Aspiration
No.Number
O/DOverdrive
OEMOriginal Equipment Manufacturing
OHCOverhead Camshaft
OHVOverhead Valve
OPTOption
O/SOversize
P & BVProportioning And Bypass Valve
PCSPower Control System
PCVPositive Crankcase Ventilation
PKBParking Brake
PPSProgressive Power Steering
PSPower Steering
PTOPower Take±Off
R & PRack And Pinion
R/BRelay Block
RBSRecirculating Ball Type Steering
R/FReinforcement
RFSRigid Front Suspension
RHRight±Hand
RHDRight±Hand Drive
RLYRelay
ROMRead Only Memory
RrRear
RRRear±Engine Rear±Wheel Drive
RRSRigid Rear Suspension
RWDRear±Wheel Drive
SDNSedan
SENSensor
SICSStarting Injection Control System
SOCState Of Charge
SOHCSingle Overhead Camshaft
SPECSpecification
SPISingle Point Injection
SRSSupplemental Restraint System
SSMSpecial Service Materials
SSTSpecial Service Tools
STDStandard
STJCold±Start Fuel Injection
SWSwitch
SYSSystem
T/ATransaxle
TACHTachometer
TBIThrottle Body Electronic Fuel Injection

DI6UT±02
DI±14
± DIAGNOSTICSENGINE
2001 PRIUS (RM778U)
DIAGNOSTIC TROUBLE CODE CHART
HINT:
Parameters listed in the chart may not be exactly the same as your reading due to the type of instru-
ment or other factors.
If a malfunction code is displayed during the DTC check in check mode, check the circuit for that code
listed in the table below. For details of each code, turn to the page referred to under the ''See page
'' for the respective ''DTC No.'' in the DTC chart.
When the ignition switch is ON and ºREADYº indicator light is OFF, the bulb check of the ºMILº is per-
formed (ºMILº is ON).
When ºMILº is ON, but the DTC of the engine is not memorized, it may be because of HV control system
abnormality, so check HV control system beforehand.
SAE CONTROLLED:
DTC No.Detection ItemTrouble AreaMIL*1Memory
P0100
(DI±23)Mass Air Flow Circuit Malfunc-
tionOpen or short in mass air flow meter circuit
Mass air flow meter
ECM

P0101
(DI±27)Mass Air Flow Circuit Range/
Performance ProblemMass air flow meter
P0110
(DI±28)Intake Air Temp. Circuit Malfunc-
tionOpen or short in intake air temp. sensor circuit
Intake air temp. sensor (built into mass air flow meter)
ECM

P0115
(DI±32)Engine Coolant Temp. Circuit
MalfunctionOpen or short in engine coolant temp. sensor circuit
Engine coolant temp. sensor
ECM

P0116
(DI±36)Engine Coolant Temp. Circuit
Range/Performance ProblemCooling system
Engine coolant temp. sensor
P0120
(DI±38)Throttle/Pedal Position Sensor/
Switch ºAº Circuit MalfunctionOpen or short in throttle position sensor circuit
Throttle position sensor
ECM

P0121
(DI±43)Throttle/Pedal Position Sensor/
Switch ºAº Circuit Range/Perfor-
mance ProblemThrottle position sensor
ECM
P0125
(DI±44)Insufficient Coolant Temp. for
Closed Loop Fuel Control
Open or short in heated oxygen sensor (bank 1 sensor 1)
circuit
Heated oxygen sensor (bank 1 sensor 1)
Air induction system
Fuel pressure
Injector
Gas leakage on exhaust system
ECM

P0128
(DI±49)Thermostat Malfunction
Thermostat
Cooling system
Water temperature
ECM

P0130
(DI±50)Heated Oxygen Sensor Circuit
Malfunction (Bank 1 Sensor 1)
(Except Calif.)
Open or short in heated oxygen sensor circuit
Heated oxygen sensor
Air induction system
EGR system
Fuel pressure
Injector
ECM


A14050
G±R
(Shielded)
512
IA2
1A
3
2
1
1EFI
3
B±G
F13B
MAIN
FL Block No. 1
BatteryEngine Room J/B
BR 1F
1K 1
2 3
11BW±B4
EB A
J7
J/C 1 2M1 Mass
Air Flow
Meter
A A 3
BE9
E810
VG
EVGECM
EFI
Relay
IEMREL
E8 G±R
19 G
R
F18 FL Block No. 2
F12W±B
J1
J/CJ9
J/C A
AW±B25
DI±24
± DIAGNOSTICSENGINE
2001 PRIUS (RM778U)
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
Read freeze frame data using TOYOTA hand±held tester or OBD II scan tool. Because freeze frame records
the engine conditions when the malfunction is detected, when troubleshooting it is useful for determining
whether the vehicle was running or stopped, the engine warmed up or not, the air±fuel ratio lean or rich, etc.
at the time of the malfunction.
1 Connect OBD II scan tool or TOYOTA hand±held tester, and read value of mass
air flow rate.
PREPARATION:
(a) Connect the OBD II scan tool or TOYOTA hand±held tester to the DLC3.
(b) Turn ignition switch ON and push the OBD II scan tool or TOYOTA hand±held tester main switch ON.
(c) Start the engine.
CHECK:
Read mass air flow rate on the OBD II scan tool or TOYOTA hand±held tester.
RESULT:
Type IType II
Mass air flow rate (gm/sec.)0.0271.0 or more

DI±194
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
2001 PRIUS (RM778U)
0: When engine is stopped
1: When stopping engine
2: When starting engine
DRIVE CONDITION3: When cranking engine or engine is operatingDRIVE CONDITION
4: While generating power or load driving
5: ±
6: While racing engine in P position
DRIVING PATTEN1History of driving pattern 1
DRIVING PATTEN2History of driving pattern 2
DRIVING PATTEN3History of driving pattern 3
DRIVING PATTERNHIstory of driving
ECU TYPEECU type
ENG INDPDET RQFactors causing engine to run independently
ENG STOP RQSTEngine stop request
ENG STP INHIBITEngine stop inhibition
ENG WARM UP RQTEngine warming up request
ENGINE FUEL CUTEngine fuel cut
ENGINE SPDEngine speed
EXCLUSIVE INFO1Exclusive information 1
EXCLUSIVE INFO2Exclusive information 2
EXCLUSIVE INFO3Exclusive information 3
EXCLUSIVE INFO4Exclusive information 4
EXCLUSIVE INFO5Exclusive information 5
EXCLUSIVE INFO6Exclusive information 6
FUEL SHORTAGELow fuel
HCAC ABSRT RQSTHCAC OBD request
HV BATT CH RQSTRequest from HV ECU to charge the battery
HV ECU INTERMITTENTHV ECU intermittent problems
IDLING REQUESTEngine idling request
IG OFF IN DRVINTurning IG OFF while driving the car
IG OFF TIMEIG OFF time
ILK OPERATIONInterlock operation
INFORMATION 1±5Information code
INPUT V LOWInput voltage is too low
INPUT V OVERInput voltage is too high
INTAKE AIRIntake air temperature
INVERT TEMP±MG1Temperature of inverter MG1
INVERT TEMP±MG2Temperature of inverter MG2
LATEST OPERLatest number of operation
LATEST TRIPLatest number of trips (IG ON±OFF)
LOAD CONDITIONIndicating which of MG1 or MG2 the vehicle uses more
MAIN BATT LOWSOC of main battery becomes low
MCYL CTRL POWERTorque for controlling oil pressure of master cylinder
MG1 TEMP HIGHTemperature MG1 is too high
MG2 TEMP HIGHTemperature MG2 is too high
MG1 CURRENT VElectric current of MG1 V phase

DI7OT±01
I15528
M5
M6M7
DI±820
± DIAGNOSTICSNAVIGATION SYSTEM
2001 PRIUS (RM778U)
TERMINALS OF ECU
MULTI DISPLAY
SymbolsC ditiSTD V lt (V)
Problem symptom when
open circuit is detected.
Symbols
(Terminals NO. )ConditionSTD Voltage (V)Problem symptom when
short circuit is detected.
TX+ (M5±3)Ignition switch
ACC or ONAbout 2.5 V Screen is in disorder.
TX3+ (M5±4)Ignition switch
ACC or ONAbout 2.5 V Screen is in disorder.
SPD ± GND
(M5±5 ± M7±6)Ignition switch ON, and driving
wheel rotated slowlyRepeatedly changes from below 1
to 9 VFuel efficiency cannot be calcu-
lated.
TX± (M5±10)Ignition switch
ACC or ONAbout 2.5 V Screen is in disorder.
TX3± (M5±11)Ignition switch
ACC or ONAbout 2.5 V Screen is in disorder.
PKB ± GND
(M5±13 ± M7±6)Parking brake switch ON (parking
brake lever released)5 V The system cannot enter Diagno-
sis System mode.
TC ± GNDIgnition switch OFF and connectContinuityNavigation system is normal.TC ± GND
(M5±14 ± M7±6)
Ignition switch OFF and connect
thermals TC and E1 of diagnosis
check connector
Continuity
The system cannot exit Service
Check mode.
VR ± VG
(M6±1 ± M6±6)ConstantContinuityScreen noise or other types of
noise occur.
R ± VG
(M6±2 ± M6±6)Diagnosis display check screen is
white (Using an oscilloscope)0.7 V ± 0.1 V *2Screen color turns to blue.
B ± VG
(M6±3 ± M6±6)Diagnosis display check screen is
white (Using an oscilloscope)0.7 V ± 0.1 V *2Screen color turns to yellow.
TX1+ (M6±5)AVC±LAN
communication circuit±Navigation system does not oper-
ate.
VG ± GND
(M6±6 ± M7±6)
ConstantContinuityScreen noise or other types of
noise occur.
(M6±6 ± M7±6)
Navigation system does not op-
eration.
G ± VG
(M6±7 ± M6±6)Diagnosis display check screen is
white (Using an oscilloscope)0.7 V ± 0.1 V *2Screen color turns to red±purple.

B11818
A13909
B11815
B00192
Vinyl Bag
S05382
Retainer
SF±4
± SFISFI SYSTEM
1218 Author: Date:
2001 PRIUS (RM778U)
(5) Hold SST as it at step 4, push the connector to-
wards SST to put the retainers on SST champfered
parts.
(6) Slide SST and the connector together towards the
fuel tube assembly.
(e) Observe these precautions when disconnecting the fuel
tube connector (quick type).
(1) Check if there is any dirt like mud on the pipe and
around the connector before disconnecting them
and clean the dirt away.
(2) Be sure to disconnect with hands.
(3) When the connector and the pipe are stuck, pinch
the retainer between the hands, push and pull the
connector to free to disconnect and pull it out. Do
not use any tool at this time.
(4) Inspect if there is any dirt or the likes on the seal sur-
face of the disconnected pipe and clean it away.
(5) Prevent the disconnected pipe and connector from
damaging and mixing foreign objects by covering
them with a vinyl bag.
(f) Observe these precautions when connecting the fuel
tube connector (quick type).
(1) Do not reuse the retainer removed from the pipe.
(2) Must use hands without using tools when to remove
the retainer from the pipe.
(3) Check if there is any damage or foreign objects on
the connected part of the pipe.

B11815
B00194
SST
SST
(Hose)
Retainer
Fuel pipe
SST
(Hose)
SST
(Hose)
SST
Fuel Tube
Connection
B11794
7
3
Battery
± SFIFUEL PUMP
SF±7
1221 Author: Date:
2001 PRIUS (RM778U)
(d) Disconnect the fuel tube (fuel tube connector) from the
fuel pipe.
CAUTION:

Perform disconnecting operations of the fuel tube
connector (quick type) after observing the precau-
tions.

As there is retained pressure in the fuel pipe line, pre-
vent if from splashing inside the engine comport-
ment.
(e) Install SST (pressure gauge) as shown in the illustration
by using SST and fuel tube connector.
SST 09268±41047 (95336±08070), 09268±45014
(09268±41200, 09268±41220, 09268±41250)
(f) Wipe off any splattered gasoline.
(g) Reconnect the negative (±) terminal cable to the battery.
(h) Connect the TOYOTA hand±held tester to the DLC3.
If you have no TOYOTA hand±held tester, connect the positive
(+) lead from the battery to terminal 3 of the connecter, and the
negative (±) lead to terminal 7.
(i) Measure the fuel pressure.
Fuel pressure:
304 ± 343 kPa (3.1 ± 3.5 kgf/cm
2, 44 ± 50 psi)
If pressure is high, replace the fuel tank.
If pressure is low, check the Fuel hoses and connections, Fuel
pump.
(j) Disconnect the TOYOTA hand±held tester from the
DLC3.
(k) Start the engine.
(l) Measure the fuel pressure at idle.
Fuel pressure:
304 ± 343 kPa (3.1 ± 3.5 kgf/cm
2, 44 ± 50 psi)
(m) Stop the engine.
(n) Check that the fuel pressure remains as specified for 5
minutes after the engine has stopped.

A13909
B11793
7
3Ohmmeter
B11794
7
3
Battery
SF±8
± SFIFUEL PUMP
1222 Author: Date:
2001 PRIUS (RM778U)
Fuel pressure:
147 kPa (1.5 kgf/cm
2, 21 psi) or more
If pressure is not as specified, check the fuel pump and/or injec-
tors.
(o) After checking fuel pressure, disconnect the negative (±)
terminal cable from the battery and carefully, remove the
SST and fuel tube connector to prevent gasoline from
splashing.
SST 09268±41047 (95336±08070), 09268±45014
(09268±41200, 09268±41220, 09268±41250)
(p) Reconnect the fuel tube (fuel tube connector).
CAUTION:
Perform connecting operations of the fuel tube connector
(quick type) after observing the precautions.
(q) Reconnect the negative (±) terminal cable to the battery.
(r) Check for fuel leakage.
3. REMOVE REAR SEAT CUSHION
4. REMOVE FLOOR SERVICE HOLE COVER
5. DISCONNECT FUEL PUMP & SENDER GAUGE CON-
NECTOR
6. INSPECT FUEL PUMP RESISTANCE
Using an ohmmeter, measure the resistance between terminals
3 and 7.
Resistance: 0.2 ± 3.0 W at 20°C (68 °F)
If the resistance is not as specified, replace the fuel tank.
7. INSPECT FUEL PUMP OPERATION
Connect the positive (+) lead from the battery to terminal 3 of
the connector and the negative (±) terminal 7. Check that the
pump operates.
NOTICE:

These tests must be done quickly (within 10 seconds)
to prevent the coil burning out.

Keep fuel pump as far away from the battery as pos-
sible.

Always do the switching at the battery side.
If operation is not as specified, replace the lead wire or fuel tank.
8. RECONNECT FUEL PUMP & SENDER GAUGE CON-
NECTOR
9. REINSTALL FLOOR SERVICE HOLE COVER
10. REINSTALL REAR SEAT CUSHION