O2 sensor TOYOTA PRIUS 2001 Service Repair Manual

± 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

DI±198
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
2001 PRIUS (RM778U)P3107
(DI±242)
Airbag ECU Communication Cir-
cuit Malfunction
Wire Harness

Airbag Sensor Assembly
P3108
(DI±244)A/C Amplifier Communication
Circuit Malfunction
Wire Harness

A/C AmplifierX
P3109
(DI±245)Brake ECU Communication Cir-
cuit Malfunction
Wire Harness

Brake ECU
P3110
(DI±247)IGCT Relay Malfunction
Wire Harness

IGCT Relay
P3115
(DI±249)System Main Relay Malfunction

Wire Harness

System Main Relay

HV ECU

P3120
(DI±252)HV Transaxle Malfunction

HV Transaxle

Wire Harness

System Main Relay

P3125
(DI±266)Converter & Inverter Assembly
Malfunction
Converter & Inverter Assembly

Wire Harness
P3130
(DI±302)Inverter Cooling System Mal-
function

Inverter Water Pump

Wire Harness

IG2 Relay

Electric Cooling Fan System

P3135
(DI±305)Circuit Breaker Sensor Malfunc-
tion
Circuit Breaker Sensor

Wire Harness
P3140
(DI±307)Interlock Malfunction

Interlock Switch

Inverter Terminal Cover

Converter & Inverter Assembly

Wire Harness

P3145
(DI±310)Vehicle Speed Sensor Circuit
Malfunction
Wire HarnessX
*: : Hybrid system warning light lights up. X: Hybrid system warning light does not light up.

± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±199
2001 PRIUS (RM778U)
INFORMATION CODE (TOYOTA Hand±held tester only)
DTC NO.INF. CodeDetection ItemDetecting Condition
B2799101Immobilizer MalfunctionNo input of signal from transponder key ECU
C2692102Regenerative Brake CheckRegenerative brake check
C2693103Regenerative Brake CheckRegenerative brake check
104Open or short in main accelerator sensor circuit
105+B short in main accelerator sensor circuit
106Main sensor internal error
107Open or short in sub accelerator sensor circuit
108+B short in sub accelerator sensor circuit
P1120109Accelerator Pedal Position
Sensor Circuit MalfunctionSub sensor internal errorP1120
11 0Sensor Circuit MalfunctionWhen difference between main sensor value and sub sensor value is large
111When sub sensor value changes while main sensor value does not
11 2When main sensor value changes while sub sensor value does not
11 3When any of the information code 104 ± 112 continues to appear
11 4Accelerator pedal not smoothly returning to original position
P152011 5
Stop Light Switch
(Cruise Control System)
Malfunction
Open or short in stop light switch circuit
P156611 6Cruise Control System
MalfunctionWhen STP signal of HV ECU is inconsistent with that of brake ECU, with
cruise control indicator ON
P160011 7BATT MalfunctionHV ECU back±up power source circuit malfunction
11 8When more than 2 main signals are ON
11 9P k/N t l P iti S it hWhen main signal is not turned ON even though sub signal has been input
P1780120Park/Neutral Position Switch
System MalfunctionOpen or short in sub sensor circuit
121
System Malfunction
When shift position detected by main signal is different from that detected
by sub signal
123HV B tt M lf tiInput of abnormal signal from battery ECU (HV battery system malfunction)
125HV Battery MalfunctionInput of abnormal signal from battery ECU (high voltage fuse blown out)
P3000388Discharge Inhibition Control
MalfunctionWhen charged battery is low due to leaving the vehicle in N position, gas
shortage or HV system malfunction
389Drop of High VoltageWhen main battery is dead or main battery is dead due to HV system mal-
function
P3001129HV Battery ECU MalfunctionBattery ECU malfunction
130HV Battery MalfunctionWhen HV battery voltage becomes lower than inverter voltage
P3004
131
PCblMlfti
When main fuse is blown out, service plug is disconnected or limiter resis-
tance is cut off
P3004
132
Power Cable MalfunctionWhen inverter voltage sensor is malfunctioning or limiter resistance value
increases
133HV Battery MalfunctionInput of abnormal signal from battery ECU
134HV ECU I t l EHV ECU Internal Error
135HV ECU Internal ErrorHV ECU Internal Error
P3100136GO Signal ErrorOpen or short in GO signal circuit
137Engine Speed Sensor
MalfunctionEngine speed sensor malfunction

± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±203
2001 PRIUS (RM778U)DTC NO.
INF. CodeDetection ItemDetecting Condition
247GND short in motor temperature sensor
248Motor Temperature SensorMotor temperature sensor malfunction
249
Motor Tem erature Sensor
MalfunctionOpen or +B short in motor temperature sensor
250Motor temperature sensor performance problem
253Generator resolver inter±phase short
P3120
254Generator Resolver Malfunc-
Generator resolver inter±phase short (When there is a history that the
state of malfunction continued during inverter fail safe mode)
P3120255
Generator Resolver Malfunc
tionOpen or short in generator resolver circuit
256Open or short in generator resolver circuit (When there is a history that the
state of malfunction continued during inverter fail safe mode)
257GND short in generator temperature sensor
258Generator Temperature Sen-Generator temperature sensor malfunction
259
Generator Tem erature Sen
sor MalfunctionOpen or +B short in generator temperature sensor
260Generator temperature sensor performance problem
263+B short in DCDC converter NODD wiring
264DCDC Converter MalfunctionDCDC converter malfunction
265
DCDC Converter Malfunction
Open or GND short in DCDC converter NODD wiring
266Open or GND short in inverter voltage signal circuit
267+B short in inverter voltage signal circuit
268Inverter voltage signal is inconsistent with battery voltage
269VM MalfunctionInverter voltage sensor malfunction
270
Abnormality of line connection of inverter voltage signal circuit (When there
is a history that the state of malfunction continued during inverter fail safe
mode)
272Motor PWN Line Connection
MalfunctionAbnormality of line connection of motor PWM (When there is a history that
the state of malfunction continued during inverter fail safe mode)
273Motor Inverter Gate Malfunc-
tionMotor inverter malfunction
P3125274Mt I t T tOpen or +B short in motor inverter temperature sensor
275Motor Inverter TemperatureGND short in motor inverter temperature sensor
276S M lf tiMotor inverter temperature sensor malfunction
277Sensor MalfunctionMotor inverter temperature sensor performance problem
278+B short in motor inverter stop signal circuit
279Over voltage of inverter
280Motor Inverter SinvOpen or GND short in motor inverter stop signal circuit
281
Motor Inverter Sinv
Voltage drop of inverter power source
282Inverter circuit broken
283+B short in motor inverter fail signal circuit
284Inverter overheating
285Motor Inverter FinvOpen or GND short in motor inverter fail signal circuit
286
Motor Inverter Finv
Inverter circuit broken
287Inverter internal short

DI±204
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
2001 PRIUS (RM778U)DTC NO.
INF. CodeDetection ItemDetecting Condition
288Motor inverter current sensor malfunction (V phase sub sensor)
289Open in motor inverter current sensor (V phase sub sensor)
290Motor inverter current sensor malfunction (V phase main sensor)
291(when there is a history that the state of malfunction continued during in-
verter fail safe mode)
292Open in motor inverter current sensor (V phase main sensor)
293(when there is a history that the state of malfunction continued during in-
verter fail safe mode)
294Mt I t C tSMotor inverter current sensor V phase performance problem
295
Motor Inverter Current Sen-
sor Malfunction(when there is a history that the state of malfunction continued during in-
verter fail safe mode)
296Motor inverter current sensor malfunction (W phase sub sensor)
297Open in motor inverter current sensor (W phase sub sensor)
298Motor inverter current sensor malfunction (W phase main sensor)
299(when there is a history that the state of malfunction continued during in-
verter fail safe mode)
300Open in motor inverter current sensor (W phase main sensor)
301(when there is a history that the state of malfunction continued during in-
verter fail safe mode)
302Mt I t C tSMotor inverter current sensor W phase performance problem
303
Motor Inverter Current Sen-
sor Malfunction(when there is a history that the state of malfunction continued during in-
verter fail safe mode)
304Motor Gate Shutdown Signal+B short in motor gate shutdown signal circuit
P3125305
Motor Gate Shutdown Signal
Line Connection MalfunctionOpen or GND short in motor gate shutdown signal circuitP3125
306Failure in Monitoring Motor
Torque PerformanceFailure in monitoring motor torque performance
307Abnormal Current Value of
MotorAbnormal current value of motor
308Detection of Collision SignalInput of collision signal from airbag or inverter
309Motor PWM Line Connection
MalfunctionOpen or short in generator inverter switching wiring (GUU, GVU, GWU)
311Generator Inverter Malfunc-
tionGenerator inverter malfunction
312Open or +B short in generator inverter temperature sensor
313Generator Inverter Tempera-GND short in generator inverter temperature sensor
314
Generator Inverter Tem era
ture Sensor MalfunctionGenerator inverter temperature sensor malfunction
315Generator inverter temperature sensor performance problem
316+B short in generator inverter stop signal circuit
317Over voltage of inverter
318Generator Inverter SinvOpen or GND short in generation inverter stop signal circuit
319
Generator Inverter Sinv
Voltage drop of inverter power source
320Inverter circuit broken
321+B short in generator inverter fail signal circuit
322Inverter overheating
323Generator Inverter FinvOpen or GND short in generator inverter fail signal circuit
324
Generator Inverter Finv
Inverter circuit broken
325Inverter internal short

± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±205
2001 PRIUS (RM778U)DTC NO.
INF. CodeDetection ItemDetecting Condition
326Generator inverter current sensor malfunction (V phase sub sensor)
327Open in generator inverter current sensor (V phase sub sensor)
328Generator inverter current sensor malfunction (V phase main sensor)
329(when there is a history that the state of malfunction continued during in-
verter fail safe mode)
330Open in generator inverter current sensor (V phase main sensor)
331(when there is a history that the state of malfunction continued during in-
verter fail safe mode)
332Generator inverter current sensor V phase performance problem
333Generator Inverter Current
(when there is a history that the state of malfunction continued during in-
verter fail safe mode)
334
Generator Inverter Current
Sensor MalfunctionGenerator inverter current sensor malfunction (W phase sub sensor)
335Open in generator inverter current sensor (W phase sub sensor)
P3125336Generator inverter current sensor malfunction (W phase main sensor)P3125
337(when there is a history that the state of malfunction continued during in-
verter fail safe mode)
338Open in generator inverter current sensor (W phase main sensor)
339(when there is a history that the state of malfunction continued during in-
verter fail safe mode)
340Generator inverter current sensor W phase performance problem
341(when there is a history that the state of malfunction continued during in-
verter fail safe mode)
342Motor Gate Shutdown Signal+B short in generator gate shutdown signal circuit
343
Motor Gate Shutdown Signal
Line ConnectionOpen or GND short in generator gate shutdown signal circuit
344Failure in Monitoring Genera-
tor Torque PerformanceFailure in monitoring generator torque performance
345Abnormal Current Value of
GeneratorAbnormal current value of generator
P3130346Inverter Cooling System Mal-Water pump system malfunctionP3130347
Inverter Cooling System Mal
functionElectric cooling fan system malfunction
P3135348Circuit Breaker Sensor Mal-GND short in circuit breaker sensorP3135349
Circuit Breaker Sensor Mal
functionOpen or +B short in circuit breaker sensor
P3140350It l kMlf tiSafety devices operating with vehicle is stopped (ILK signal ON)P3140351Interlock MalfunctionOpen circuit in interlock signal circuit while vehicle is running
P3145352Vehicle Speed Sensor Circuit
MalfunctionNo input of vehicle speed signal during cruise control driving

A14132
H14Hybrid Vehicle
Control ECU
VCP1
VPA1
EP1
VCP2
VPA2
EP2 A13 Accel Position
Sensor
Y
6
5
3
4
2
1VCP1
VPA1
EP1
VCP2
VPA2
EP2 H14
H14
H14
H14
H14 G
L
B
W
R1413
12
23
15
22
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±213
2001 PRIUS (RM778U)
DTC P1120 Accelerator Pedal Position Sensor Circuit
Malfunction
CIRCUIT DESCRIPTION
The accelerator pedal position sensor mounted on the accelerator pedal has main and sub sensors and de-
tects the accelerator pedal position and the malfunction of the accelerator position sensor itself.
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 P1120 ± Information code 104, 105, 107, 108
INF. code.Detecting ConditionTrouble Area
104Open or short in main accelerator sensor circuit
105+B short in main accelerator sensor circuit
Accelerator pedal position sensor
107Open or short in sub accelerator sensor circuit

Accelerator edal osition sensor

Wire harness
108+B short in sub accelerator sensor circuit
WIRING DIAGRAM
DI82Q±02

DI±214
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Check for open, short and +B short in wire harness between HV ECU and accel-
erator pedal position sensor (See page IN±41).
Terminals for checking open and short:
Accelerator pedal position sensor
TerminalsHV ECU Terminals
VCP1VCP1
VPA1VPA1
EP1EP1
VCP2VCP2
VPA2VPA2
EP2EP2
HINT:
The acceleration pedal position sensor circuit has +B short if the voltage at the HV ECU VPA1 or VPA2 termi-
nal is more than 5V with the ignition ON.
NG Repair or replace wire harness.
OK
Check and replace accelerator pedal position sensor (See page SF±59).
DTC P1120 ± Information code 106, 109, 110, 111, 112, 113, 114
INF. code.Detecting ConditionTrouble Area
106Main sensor internal error
109Sub sensor internal error
11 0When difference between main sensor value and sub sensor
value is large
111When sub sensor value changes while main sensor value does
not

Accelerator pedal position sensor
11 2When main sensor value changes while sub sensor value does
not
Accelerator edal osition sensor
11 3When any of the information code 104 ± 112 continues to ap-
pear
11 4Accelerator pedal not smoothly returning to original position
INSPECTION PROCEDURE
If the information code 106 or 109 ± 114 is output,check and replace the accelerator pedal position sensor
(See page SF±59).

A14130
H13Hybrid Vehicle
Control ECU P1
Park/neutral Position SW
P
65
3 42
8VSFT
SFT
FSFT L±R
L±W
L±BN
D
B
R 14
11 1223 15
22 H13
H13
H13
H13
H13
H13
H1313
21 97LG±R
R±B
W
B
R
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±221
2001 PRIUS (RM778U)
DTC P1780 Park/neutral Position Switch System Mal-
function
CIRCUIT DESCRIPTION
The park/neutral position switch sends both main sensor signal (switch signal) and sub sensor signal (ana-
logue value) to the HV ECU. The HV ECU uses those signals to detect the shift lever position (P, R, N, D
or B) and to control the forward and backward movement of the vehicle.
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 P1780 ± Information code 118, 119, 120, 121
INF. code.Detecting ConditionTrouble Area
11 8When more than 2 main signals are ON
11 9When main signal is not turned ON even though sub signal has
been input

Park/neutral position switch
120Open or short in sub sensor circuit

Park/neutral osition switch

Wire harness
121When shift position detected by main signal is different from
that detected by sub signal
WIRING DIAGRAM
DI82U±02