2001 TOYOTA PRIUS O2 sensor

DI±154
± DIAGNOSTICSENGINE
2001 PRIUS (RM778U)
2 Check remaining amount of fuel.
NG Supply fuel.
OK
3 Check air induction system (See page SF±1).
NG Repair or replace.
OK
4 Check for umusual noise or vibration when starting engine or racing.
NG Repair or replace.
OK
5 Check fuel pressure (See page SF±6).
NG Check and repair fuel pump and fuel pipe line
(See page SF±19).
OK
6 Check air flow meter (See page SF±22) and engine coolant temp. sensor
(See page SF±49).
NG Repair or replace.
OK

± DIAGNOSTICSENGINE
DI±155
2001 PRIUS (RM778U)
7 Check crankshaft position sensor and camshaft position sensor
(See page IG±1).
NG Repair or replace.
OK
8 Check throttle control motor and throttle position sensor (See page SF±24).
NG Repair or replace.
OK
Chack and replace ECM (See page IN±41).

HV ECU±DTC & Information #
INFORMATION 1
INFORMATION 2
INFORMATION 3
INFORMATION 4
INFORMATION 5
INFORMATION 1
INFORMATION 2
INFORMATION 3
INFORMATION 4
INFORMATION 5
INFORMATION 1
INFORMATION 2
INFORMATION 3
INFORMATION 4
INFORMATION 5
INFORMATION 1
INFORMATION 2
INFORMATION 3
INFORMATION 4
INFORMATION 5
HV ECU±Information & Freezed frame data
MG1 REV
MG2 REV
MG1 TORQ
MG2 TORQ
POWER RQST
ENGINE SPD
MCYL CTRL POWER
SOC
WOUT CTRL POWER
WIN CTRL POWER
DRIVE CONDITION
INVERT TEMP ± MG1
INVERT TEMP ± MG2
MG1 TEMP
MG2 TEMP
PWR RESOURCE VM
PWR RESOURCE IB
SHIFT SENSOR 1
ACC SENSOR MAIN
ENG STOP RQST
IDLING REQUEST
ENGINE FUEL CUTrpm
rpm
rpm N´m
NmW
W
W%
( °C)
V
V A
Yes / No
Yes / No
Yes / NoHV BATT CH RQST
HCAC ABSRT RQST
ENG WARM UP RQT
STOP SW COND
CRUISE CONTROL
AUX. BATT V
EXCLUSIVE INFO1
EXCLUSIVE INFO2
EXCLUSIVE INFO3
EXCLUSIVE INFO4
EXCLUSIVE INFO5
EXCLUSIVE INFO6
LOAD CONDITION
DRIVING PATTEN1
DRIVING PATTEN2
DRIVING PATTEN3
IG OFF IN DRVIN
SG B IN REDUCIN
SG N IN REDUC/P
STEP ACC&BRAKE
IG OFF TIME
OCCURRENCE ORDERV Yes / No
Yes / No
Yes / No
Yes / No
Yes / No
Yes / No
Yes / No
Yes / No
Yes / No MG1 / MG2
min
± DTC
DTC
DTC
DTC
N´m
INFORMATION
°F
( °C) °F
( °C) °F
( °C) °F DI±180
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
2001 PRIUS (RM778U)

F12396
TOYOTA hand±held tester
DLC3
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±187
2001 PRIUS (RM778U)
(d) Clear the DTC after completion of repair.
(1) Connect the TOYOTA hand±held tester to the
DLC3.
Before clearing, check that DTCs and freeze frame
data of the HV ECU and the ECU related to the op-
eration history data are reccorded.
(2) Operate the TOYOTA hand±held tester to erase the
DTC (See the hand±held tester operator's manu-
al.).
4. FAIL±SAFE CHART
If any the following codes is recorded, the HV ECU enters the fail safe mode.
DTC codeINF. codeTrouble areaDriving condition
B2799101Immobilizeer MalfunctionImpossible to drive
C2692102Regenerative Brake Check±
C2693103Regenerative Brake Check±
104Limited driving
105Limited driving
106Limited driving
107Limited driving
108Limited driving
P1120109Accelerator Pedal Position
Sensor Circuit MalfunctionLimited drivingP1120
11 0Sensor Circuit MalfunctionLimited driving
111Limited driving
11 2Limited driving
11 3Limited driving (Creep vehicle speed)
11 4Limited driving (Creep vehicle speed)
P152011 5Stop Light Switch MalfunctionCruise control driving impossible
P156611 6Cruise Control System Mal-
functionCruise control driving impossible
P160011 7BATT MalfunctionNormal driving
11 8Impossible to drive/Normal driving when shift position is fixed
P178011 9Park/Neutral Positiont SwitchImpossible to drive/Normal driving when shift position is fixedP1780120
Park/Neutral Positiont Switch
System MalfunctionImpossible to drive
121
y
Impossible to drive/Normal driving when shift position is fixed
123Limited driving
P3000125HV B tt M lf tiLimited drivingP3000388HV Battery MalfunctionLimited driving
389Limited driving
P3001129HV Battery ECU MalfunctionLimited driving
130Limited driving
P3004131PCblMlftiImpossible to driveP3004132Power Cable MalfunctionNormal driving
133Limited driving

DI±192
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
2001 PRIUS (RM778U)
309Limited driving
311Normal driving
312Normal driving
313Normal driving
314Normal driving
315Normal driving
316Limited driving
317Limited driving
318Limited driving
319Limited driving
320Limited driving
321Limited driving
322Limited driving
323Limited driving
324Limited driving
325Limited driving
326Limited driving
P3125327Converter & Inverter Assem-Limited drivingP3125328
Converter & Inverter Assem
bly MalfunctionLimited driving
329
y
Limited driving
330Limited driving
331Limited driving
332Limited driving
333Limited driving
334Limited driving
335Limited driving
336Limited driving
337Limited driving
338Limited driving
339Limited driving
340Limited driving
341Limited driving
342Limited driving
343Limited driving
344Limited driving
345Limited driving
P3130346Inverter Cooling System Mal-Normal drivingP3130347
Inverter Cooling System Mal
functionNormal driving
P3135348Circuit Breaker Sensor Mal-Normal drivingP3135349
Circuit Breaker Sensor Mal
functionNormal driving
P3140350It l kMlf tiNormal drivingP3140351Interlock MalfunctionNormal driving
P3145352Vehicle Speed Sensor Circuit
MalfunctionCruise control driving impossible

± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±193
2001 PRIUS (RM778U)
5. CHECK FOR INTERMITTENT PROBLEMS
(a) Perform a simulation test (See page IN±41).
In the simulation test, reproduce the driving condition at the trouble occurrence according to the cus-
tomer 's comments and freeze frame data recorded with DTC, such as an opening angle of the acceler-
ator pedal, SOC, engine coolant temperature, engine rpm, and MG/1MG2 rpm and torque.
(b) Check the connector and terminal (See page IN±41).
(c) Handle the connector (See page IN±41).
6. TOYOTA HAND±HELD TESTER DISPLAY ITEMS
TOYOTA Hand±held tester displayMeasurement Item
1 BEF LATST ORNumber of operation of 1 trip before last
1 BEF LATST TRPNumber of trips before last
2 BEF LATST ORNumber of operation 2 trips before last
2 BEF LATST TRPNumber of trips 2 before last
ABNML CON BR±HVCommunication malfunction between HV ECU and brake
ACC SENSOR MAINMain accelerator sensor
ACC SENSOR SUBSub accelerator sensor
ACC TENT TRBLETentative trouble of accelerator
ACC THROTTLEAccelerator throttle
ACCEL MODEHistory of acceleration and reduction
AIR CON REQUESTAir conditioner request
AUX. BATT LOWAuxiliary battery becomes week
AUX. BATT VVoltage of auxiliary battery
BATT HIGH TEMPTemperature of the battery is too high
BATT HIGH VOLTVoltage of the battery is too high
BATT LOW BOLTVoltage of the battery is low
BATT OVER LOADBattery is overloaded
BATT SAVE RQSTRequest to save the main battery
BATTERY FULLBattery full
BRAKE TORQBrake torque
CELL TEMP±MAXHighest temperature of all battery cells
CELL TEMP±MINLowest temperature of all battery cells
CHG RESTRICTIONCharge restriction
COOLANT TEMPWater temperature
CRUISE CONTROLCondition of the cruise control
DC/DC CONV STOPDC/DC converter stop signal
DC/DC CONV STOPFactors causing DC/DC converter to stop
DC/DC STOP FACTDC/DC converter has stopped at least once
DC/DC V UNSETDC/DC voltage is unsettled
DCHG RQST SOCDischarge request to adjust SOC
DISCHAG INHIBITBattery is inhibited to discharge

± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±195
2001 PRIUS (RM778U) MG1 CURRENT W
Electric current of MG1 W phase
MG1 INV TEMP HITemperature of inverter MG1 is high
MG1 REVMG1 revolution
MG1 TEMPMotor temperature of MG1
MG1 TEMP HIGHTemperature fo MG1 is too high
MG2 TEMP HIGHTemperature fo MG2 is too high
MG1 CURRENT VElectric cuurent of MG1 is V phase
MG1 CURRENT WElectric cuurent of MG1 is W phase
MG1 INV TEMP HITemperature of inverter MG1 is higt
MG1 REVMG1 revolution
MG1 TEMPMotor temperature of MG1
MG1 TEMP HIGHTemperature of MG1 is high
MG1 TORQMG1 torque
MG2 CURRENT VElectric cuurent of MG2 is V phase
MG2 CURRENT WElectric cuurent of MG2 is W phase
MG2 INV TEMP HITemperature of inverter MG2 is higt
MG2 REVMG2 revolution
MG2 TEMPMotor temperature of MG2
MG2 TEMP HIGHTemperature of MG2 is high
MG2 TORQMG2 torque
N RANGE OVR TIMELeaving shift gear into N position over a period of time
N RANGE CTRL1N position control due to incomplete shift gears
N RANGE CTRL2N position control due to rapid shift gear (D±R)
OCCURRENCE ORDROrder in which the trouble occurs
OCCURRNCE TRIPNumber of trips when this error occurred
OUTPUT STOPOutput stop
OUTPUT V OVEROutput voltage is too high
OVER CURRENTElectric current of the batytery is too high
OVER VOLTAGEVoltage of the battery is too high
OVR HEAT PRTECTOverheat protection
POWER RQSTPower output requested by HV ECU
PWR RESOURCE IBPower resource IB
PWR RESOURCE VMpower resource VM
RAPID SPD CHANGVehicle speed is changed too rapidly
REGEN EXEC TORQTorque volue of regenerative brake
REGEN IH FACTORInhibiting factor of regeneration
REGEN RQST TORQTorque valueof regenerative brake requested by HV ECU
REGN BRK INEFCTRegenerative brake is ineffective
RESIST OVR HEATRestriction resist is overheating
SG B IN REDUCINShifting gear into ºBº in reducing the speed
SG N IN REDUC/PShifting gear into ºNº reducing the speed
SHIFT BEF READYShifting gear before ºREADYº light turns on
SHIFT POSITIONShift position
SHIFT SENSOR1Shift sensor 1
SHIFT SENSOR2Shift sensor 2
SOCStated of charge

DI82L±02
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±197
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 instrument
or other factors.
If a malfunction code is displayed during the DTC check in the check mode, check the circuit for that code
listed in the table below. For the details of each code, turn to the page referred to under the ''See page'' for
the respective ''DTC No.'' in the DTC chart.
DTC No.
(See page)Detection ItemTrouble Area
Hybrid
System
Warning
Light*
Memory
B2799
(DI±210)Immobilizer Malfunction
Wire Harness

Immobilizer System
C2692
(DI±212)Regenerative Brake Check±
C2693
(DI±212)Regenerative Brake Check±X
P1120
(DI±213)Accelerator Pedal Position
Sensor Circuit Malfunction
Accelerator Pedal Position Sensor

Wire Harness
P1520
(DI±215)Stop Light Switch (Cruise Con-
trol System) Malfunction
Stop Light Switch

Wire Harness

Brake ECU
X
P1566
(DI±217)Cruise Control System Malfunc-
tion
Stop Light Switch

Brake ECU

Wire Harness
X
P1600
(DI±219)BATT Malfunction
HV Fuse

Wire Harness
P1780
(DI±221)Park/Neutral Position Switch
System Malfunction
Park/Neutral Position Switch

Wire Harness
P3000
(DI±223)HV Battery Malfunction

HV Battery System

High Voltage Fuse

Power Cable

HV Battery Cooling System
/X
P3001
(DI±224)HV Battery ECU Malfunction
Battery ECU
P3004
(DI±225)Power Cable Malfunction

Power Cable

HV Battery System

Service Plug

System Main Relay

Converter & Inverter Assembly
/X
P3100
(DI±229)HV ECU Malfunction

Wire Harness

HV ECU

ECM

Crankshaft Position Sensor

Camshaft Position Sensor

Ignition Switch

P3101
(DI±237)Engine System Malfunction
Engine

HV Transaxle
P3105
(DI±238)Battery ECU Communication Cir-
cuit Malfunction
Wire Harness

Battery ECU
P3106
(DI±240)ECM Communication Circuit
Malfunction
Wire Harness

ECM/X