engine TOYOTA PRIUS 2001 Service Repair Manual

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

DI±196
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
2001 PRIUS (RM778U) STEP ACC&BRAKE
Stepping both accelerator & brake at the same time
STEPP ACC IN NStepping accelerator in N position
STOP SW CONDCondition of stop switch
STP CIRCIT OPENSTP circuit short
STP IN CIR MLFSTP circuit malfunciton
TACHO METEREngine rpm
TARGET ENG SPDTarget engine speed
TEMP TRBLE FACTFactors causing temporay trouble
VEHICLE SPDVehicle speed
WIN CTRL POWERPower value of charge control
WOUT CTRL POWERPower value of discharge control

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

± 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±201
2001 PRIUS (RM778U)DTC NO.
INF. CodeDetection ItemDetecting Condition
171HV ECU internal error
172Motor REF Signal MalfunctionHV ECU internal error
173
Motor REF Signal Malfunction
HV ECU internal error
174Motor Inverter Current Sen-HV ECU internal error
175
Motor Inverter Current Sen
sor MalfunctionHV ECU internal error
176Motor Gate Shutdown Signal
Line Connection MalfunctionHV ECU internal error
177HV ECU internal error
178Motor Main CPU MalfunctionHV ECU internal error
179
Motor Main CPU Malfunction
HV ECU internal error
180HV ECU internal error
181HV ECU internal error
182HV ECU internal error
183Rotation Angle Check CPU
MalfunctionHV ECU internal error
184MalfunctionHV ECU internal error
185HV ECU internal error
186HV ECU internal error
187Important RAM MalfunctionHV ECU internal error
188HV ECU internal error
P3100189HV ECU internal error
190HV ECU internal error
191HV ECU internal error
192Generator CPU MalfunctionHV ECU internal error
193
Generator CPU Malfunction
HV ECU internal error
194HV ECU internal error
195HV ECU internal error
196HV ECU internal error
310Generator PWN Line Con-
nection MalfunctionHV ECU internal error
197HV ECU internal error
198HV ECU internal error
199G t R/D M lf tiHV ECU internal error
200Generator R/D MalfunctionHV ECU internal error
201HV ECU internal error
202HV ECU internal error
203Generator Shutdown Signal
Line Connection MalfunctionHV ECU internal error
390Charge Inhibition Control Mal-
functionHV ECU internal error
204Ei St Mlf tiInput of abnormal signal from the ECM (abnormal engine output)
P3101205Engine System MalfunctionInput of abnormal signal from the ECM (engine unable to start)P3101
238Transaxle MalfunctionWhen engine does not start even though cranking it
206
P3105207Battery ECU Communication
Circuit Malfunction
When communication between battery ECU and HV ECU is abnormal 1
sec after ignition is turned ONP3105
208Circuit Malfunctionsec. after ignition is turned ON

DI±208
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
2001 PRIUS (RM778U)
Shift lever is P positionApprox. 0.5
Shift lever is R positionApprox. 2.8SFT (H13±11) e GSFT
(H13 21)B±RShift lever is N positionApprox. 3.4(H13±21)BR
Shift lever is D positionApprox. 4.0
Shift lever is B positionApprox. 4.5
VSFT (H13±12) e GSFT
(H13±21)W±RIgnition switch ON4 or more
SPDI (H12±8) e GND1
(H14±31)V±W e W±BIgnition switch ON and rotor driving wheel slowlyPulse generation
ESTP (H14±8) e GND1RYWBEngine stop is not required9 ± 14ESTP (H14 8) e GND1
(H14±31)R±Y eW±BEngine stop is requiredBelow 1
SPDO (H14±6) e GND1
(H14±31)O e W±BIgnition switch ON and rotor driving wheel slowlyPulse generation
When converter is in normal operation5 ± 7NODD (H12±4) e GND1
(H14 31)L±O e W±BWhen converter is improper2 ± 4(H14±31)LO e WB
When converter is required to stop0.1 ± 0.5
ILK (H13±4) e GND1OWBIgnition switch ON and interlock switch ONBelow 1ILK (H13 4) e GND1
(H14±31)O eW±BIgnition switch ON and interlock switch OFF4 or more
AS1G (H12±14) e AS1
(H12±15)BR±B e G±RIgnition switch ON2.5 ± 2.9
IB (H14 25)GB (H14 26)BLRWIgnition switch OFFBelow 1IB (H14±25) e GB (H14±26)B±L eR±WIgnition switch from ON to ST (ºREADYº light ON)0.5 ± 4.5
ABFS (H13±3) e GND1
(H14±31)L eW±BIgnition switch ON and ºREADYº light ON2.7 ± 3.2
MREL (H12±7) e GND1
(H14±31)O eW±BIgnition switch ON9 ± 14
Communication Line
Symbols (Terminals No.)Wiring ColorConnecting Part or Symbol (Terminal No.)
GSNG (H10±11)GMG1, GSNG (M2±7)
GSN (H10±4)RMG1, GSN (M2±2)
GRF (H10±10)BMG1, GRF (M2±1)
GRFG (H10±17)WMG1, GRFG (M2±6)
GCS (H10±5)YMG1, GCS (M2±3)
GCSG (H10±12)BRMG1, GCSG (M2±8)
GMTG (H10±8)G±WMG1, GMTG (M2±9)
GMT (H10±1)B±RMG1, GMT (M2±4)
MSNG (H10±20)GMG2, MSNG (M3±5)
MSN (H10±13)RMG2, MSN (M3±2)
MRF (H10±19)PMG2, MRF (M3±1)
MRFG (H10±18)LMG2, MRFG (M3±4)
MCS (H10±14)BMG2, MCS (M3±3)
MCSG (H10±21)WMG2, MCSG (M3±6)
MMTG (H10±9)R±WMG2, MMTG (M4±3)
MMT (H10±2)GRMG2, MMT (M3±1)
MSIV (H11±21)GInverter, M±SINV (I10±7)
MSDN (H11±13)YInverter, M±SDOWN (I9±4)
MIT (H11±11)LInverter, M±INVT (I9±5)

± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±209
2001 PRIUS (RM778U) MWU (H11±6)
GInverter, M±WU (I9±3)
MUU (H11±4)RInverter, M±UU (I9±1)
MVU (H11±5)WInverter, M±VU (I9±2)
MIVG (H11±26)BInverter, M±GINV (I9±6)
MIVA (H11±16)BInverter, M±IVA (I10±1)
MIVB (H11±7)WInverter, M±IVB (I10±3)
MIWB (H11±17)GInverter, M±IWB (I10±4)
VB (H11±20)YInverter, VB (I10±5)
MIWA (H11±25)RInverter, M±IWA (I10±2)
GIVA (H11±19)BInverter, G±IVA (I12±1)
GIVB (H11±8)WInverter, G±IVB (I12±3)
GIWB (H11±18)GInverter, G±IWB (I12±4)
GIWA (H11±28)RInverter, G±IWA (I12±2)
GSDN (H11±12)YInverter, G±SDOWN (I11±4)
GIT (H11±23)LInverter, G±INVT (I11±5)
GWU (H11±3)GInverter, G±WU (I11±3)
GVU (H11±2)WInverter, G±VU (I11±2)
GUU (H11±1)RInverter, G±UU (I11±1)
GIVG (H11±27)BInverter, G±GINV (I11±6)
MFIV (H11±14)BInverter, M±FINV (I10±8)
GSIV (H11±15)GInverter, G±SINV (I12±7)
GFIV (H11±24)BInverter, G±FINV (I12±8)
ETH+ (H14±28)PEngine ECU, ETH+ (E9±28)
ETH± (H14±27)LEngine ECU, ETH± (E9±27)
HTE+ (H14±19)YEngine ECU, H TE+ (E9±19)
HTE± (H14±29)BREngine ECU, H TE± (E9±18)
HTB+ (H14±20)LGBrake ECU, HVI+ (B10±24)
HTB± (H14±30)VBrake ECU, HVI± (B10±16)
BTH+ (H14±18)GBrake ECU, HVO+ (B10±14)
BTH± (H14±17)RBrake ECU, HVO± (B10±22)
FCVC (H14±7)B±WTransponder Key ECU, HEVC (T4±8)
CON1 (H12±13)VSystem Main Relay (S8±3)
CON2 (H12±2)GRSystem Main Relay (S8±4)
CON3 (H13±1)PSystem Main Relay (S8±5)
HTD+ (H13±2)WBattery ECU, HTD+ (B17±6)
HTD± (H13±20)BBattery ECU, HTD± (B17±7)
DTD+ (H13±19)RBattery ECU, DTD+ (B17±18)
DTD± (H13±18)GBattery ECU, DTD± (B17±19)

A14147
H14Hybrid Vehicle
Control ECU
H14
BatteryMAIN
B±G1 1
F1811 1
111
F13 2
3
2
2 Engine Room J/BSTP
ST1± G±W
J15 E
2 J14D J/C
G±W S3
Stop Light
SW
R±B
R±B4B±Y B±W B±W B
B
J24 J25 ID1J/C
B±W
I15
Ignition SW
W±RW±R
67
9
IG2AM2
Instrument Panel J/B
STOP 2C
2K2H 2G9
1J 1BAM2
B
W
F12 F11
DC/DC
Fusible Link Block No. 1 Fusible Link
Block No. 16
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±215
2001 PRIUS (RM778U)
DTC P1520 Stop Light Switch (Cruise Control System)
Malfunction
CIRCUIT DESCRIPTION
The HV ECU detects the malfunction of the cruise control system and inhibits the operation of the cruise
control.
It detects faulty output of the STP and ST1± signals sent from the stop light switch or an error signal from
the brake ECU.
DTC P1520 ± Information code 115
INF. code.Detecting ConditionTrouble Area
11 5Open or short in stop light switch circuit

Stop light switch

Wire harness

Brake ECU
WIRING DIAGRAM
DI82R±02

A14146
BatteryB±G 1 1
F18 F13
Fusible Link
Block No. 2Hybrid Vehicle
Control ECU
H14
Engine Room J/B B
B J/C
1BFusible Link
Block No. 1
F12 B
1
MAIN 1F11
1 HV G±YJ2
J3G±Y
G±Y
IA143
BATT
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±219
2001 PRIUS (RM778U)
DTC P1600 BATT Malfunction
CIRCUIT DESCRIPTION
Since the ECU back±up power source is used for DTC and freeze frame data memory, the back±up power
source (BATT) continues to be supplied to the HV ECU even though the ignition switch is turned OFF.
DTC P1600 ± Information code 117
INF. code.Detecting ConditionTrouble Area
11 7HV ECU back±up power source circuit malfunction
HV Fuse

Wire harness
WIRING DIAGRAM
DI82T±02

DI±220
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Check continuity of HV fuse of engine room J/B.
OK:
Continuity
NG Check for short in all harness and parts con-
nected to HV fuse.
OK
Repair or replace wire harness.