2001 TOYOTA PRIUS check engine

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±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.

A14150
H12Hybrid Vehicle
Control ECU
10 21
GO G 9
IA2 G
E9 GO ECM
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±229
2001 PRIUS (RM778U)
DTC P3100 HV ECU Malfunction
CIRCUIT DESCRIPTION
The HV ECU compares Ne signal with G signal that are sent from the ECM and checks whether the engine
rpm signal is correct or not.
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 P3100 ± Information code 136, 137
INF. Code.Detecting ConditionTrouble Area
136Open or short in GO signal circuit
Wire harness

ECM
137Engine speed sensor malfunction

ECM

Crankshaft position sensor

Camshaft position sensor
WIRING DIAGRAM
DI82Y±02

A14148
Hybrid Vehicle
Control ECU
Instrument Panel J/BI15
Ignition SW
Engine Room J/BFusible Link
Block No. 1ST2 R±W6
H13 2C2
W±R
2G2
W±R
1J9AM2
B
B±G
MAIN
Battery1B2
F121
F131
B±G
F181 Fusible Link
Block No. 2
ST2 AM27
8
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±233
2001 PRIUS (RM778U)
CIRCUIT DESCRIPTION
The HV ECU checks the ST signal and detects malfunction. If the ST signal has +B short, the ST will always
be ON. Therefore, even with the IG ON when starting the THS, the system will start. To prevent this from
happening, the HV ECU detects the malfunction of the ST signal.
DTC P3100 ± Information code 142
INF. Code.Detecting ConditionTrouble Area
142When ST signal of HV ECU is ON, with ignition switch
turned OFF.
Wire harness

HV ECU

Ignition switch
WIRING DIAGRAM

A14737
Hybrid Vehicle
Control ECU Engine Room R/B No. 2
Fusible Link
Block No. 1
Battery+B1
MREL 4
H14
1FG±Y
W±G
O 2
7
H12 W±G12
IA1
2 2
2
213 5
Engine
Room J/B 11
HV
F12B±GMAIN 1B 1
B
F13Fusible Link
Block No. 2
1
F18 A
J7
J/C
W±B
IE
EC W±B W±B
AJ1
J/C
AA IGCT Relay
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±247
2001 PRIUS (RM778U)
DTC P3110 IGCT Relay Malfunction
CIRCUIT DESCRIPTION
The HV ECU checks the IGCT relay and detects malfunction.
DTC P3110 ± Information code 223
INF. Code.Detecting ConditionTrouble Area
223
When IGCT relay is always closed.
Wire harness

IGCT relay
WIRING DIAGRAM
DI835±02

S04947S04946
A14712
12
35
12
35
Ohmmeter
Battery Continuity
Ohmmeter
Ohmmeter
ContinuityNo Continuity
DI±248
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Check IGCT relay.
PREPARATION:
Remove the IGCT relay from the engine room R/B No. 3.
CHECK:
(a) Using an ohmmeter, check that there is continuity be-
tween terminals 1 and 2.
(b) Check that there is no continuity between terminals 3 and
5.
(c) Apply battery voltage across terminals 1 and 2. Using an
ohmmeter, check that there is continuity between termi-
nals 3 and 5.
OK:
(a) Continuity
(b) No continuity
(c) Continuity
NG Replace IGCT relay.
OK
Check for +B short in wire harness between HV ECU and IGCT relay (See page IN±41).
Repair or replace wire harness.
HINT:
The HV ECU MREL terminal has +B short if the battery voltage is always applied to the HV ECU +B1 or MREL
terminal with the ignition OFF.