2001 TOYOTA PRIUS immobilizer

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

DI±200
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
2001 PRIUS (RM778U)DTC NO.
INF. CodeDetection ItemDetecting Condition
127+B short in IB terminal circuit of HV ECU
128IB Circuit MalfunctionOpen or short in IB terminal circuit of HV ECU
138
IB Circuit MalfunctionWhen the difference between battery current of HV ECU and current of
battery is large
139IG Signal Circuit MalfunctionHV ECU internal error
140RAM BrakedHV ECU internal error
141ROM BrakedHV ECU internal error
142ST Signal Circuit MalfunctionWhen ST signal of HV ECU is ON, with ignition switch turned OFF
143Immobilizer MalfunctionHV ECU internal error
144HV ECU internal error
145P i Ch k M lf tiHV ECU internal error
146Primary Check MalfunctionHV ECU internal error
147HV ECU internal error
391Mt CPUMlf tiHV ECU internal error
392Motor CPU MalfunctionHV ECU internal error
393HV CPU Operation Malfunc-
tionHV ECU internal error
148HV CPU M lf tiHV ECU internal error
149HV CPU MalfunctionHV ECU internal error
150HV ECU internal error
151HV ECU internal errorP3100152HV ECU internal error
153Motor CPU MalfunctionHV ECU internal error
154
Motor CPU Malfunction
HV ECU internal error
155HV ECU internal error
156HV ECU internal error
157Mt CPUMlf tiHV ECU internal error
158Motor CPU MalfunctionHV ECU internal error
159Motor ECU CommunicationHV ECU internal error
160
Motor ECU Communication
Circuit MalfunctionHV ECU internal error
161HV ECU internal error
162HV ECU internal error
163Motor ECU Power Source
MalfunctionHV ECU internal error
164MalfunctionHV ECU internal error
165HV ECU internal error
271Motor PWN Line Connection
MalfunctionHV ECU internal error
166HV ECU internal error
167HV ECU internal error
168Motor R/D MalfunctionHV ECU internal error
169
Motor R/D Malfunction
HV ECU internal error
170HV ECU internal error

DI82O±02
A14140
T4
Transponder
Key ECU
HEVC8
B ± W7
H14FCVC Hybrid Vehicle
Control ECU DI±210
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
2001 PRIUS (RM778U)
CIRCUIT INSPECTION
DTC B2799 Immobilizer Malfunction
CIRCUIT DESCRIPTION
The HV ECU checks the condition of the communication from the transponder key ECU.
DTC B2799 ± Information code 101
INF. code.Detecting ConditionTrouble Area
101No input of signal from transponder key ECU
Wire harness

Immobilizer system
WIRING DIAGRAM

± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±211
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Check for open and short in wire harness between HV ECU FCVC terminal and
transponder key ECU HEVC terminal (See page IN±41).
NG Repair or replace wire harness.
OK
Check and repair immobilizer system (See
page BE±104).

BE±10
± BODY ELECTRICALTROUBLESHOOTING
1677 Author: Date:
2001 PRIUS (RM778U) Even when the system is not set
(Headlights stay on).
Headlight control relay circuitDI±697
Even when the system is not set
(Taillights stay on).Taillight control relay circuitDI±691
WIRELESS DOOR LOCK CONTROL SYSTEM
This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
HINT:
Troubleshooting of the wireless door lock control system is based on the premise that the door lock
control system is operating normally. Accordingly, before troubleshooting the wireless door lock control
system, first make certain that the door lock control system is operating normally.
If the trouble still reappears even though there are no abnormalities in any of the other circuits, then
check and replace the Wireless Door Lock Control Receiver as the last step.
SymptomSuspect AreaSee page
All functions of wireless door lock control system do not operate.
1. Transmitter
2. Wireless Door Lock Control Receiver
3. Wire Harness
4. Body ECUBE±83
BE±83
±
DI±678
POWER MIRROR CONTROL SYSTEM
SymptomSuspect AreaSee page
Both right and left mirrors do not operate.
1. ACC Fuse
2. ACC Relay
3. Mirror Switch
4. Wire HarnessBE±12
BE±12
BE±93
±
Only one side of mirror does not operate.1. Mirror Motor
2. Wire HarnessBE±93
±
AUDIO SYSTEM
SymptomSuspect AreaSee page
Audio system abnormal operation.TROUBLESHOOTINGBE±97
CLOCK SYSTEM
SymptomSuspect AreaSee page
Clock will not operate.TROUBLESHOOTING NO.1BE±102
Clock loses or gains time.TROUBLESHOOTING NO.2BE±102
HYBRID BEHICLE IMMOBILIZER SYSTEM
SymptomSuspect AreaSee page
Hybrid vehicle immobilizer system does not operate.Pre±checkBE±111

± BODY ELECTRICALTHEFT DETERRENT SYSTEM
BE±69
2001 PRIUS (RM778U)
Indicator light output:
ConditionIndicator light
Disarmed stateOFF
Arming preparationON
Armed stateOFF
Alarm soundingON
HINT:
Even in disarmed state, the indicator light flash. (Due to the sig-
nal output form immobilizer system). The indicator always
flashes receiving the signal from the immobilizer system at any
time in the armed state.
Flashing frequency:
0.2 seconds (ON)
1.8 seconds (OFF)
Answer back:
The hazard lights flush as answer back under the following
conditions.
(1) When the system is set.
When arming preparation is set from disarmed state
using the wireless door lock, the hazard lights flush
once.
(2) When the system is released.
When disarmed state is set from either arming prep-
aration, armed state or alarm sounding using the
wireless door lock, the hazard lights flush twice.

± BODY ELECTRICALTHEFT DETERRENT SYSTEM
BE±73
2001 PRIUS (RM778U)
Indicator light output:
ConditionIndicator light
Disarmed stateOFF
Arming preparationON
Armed state
(Entry delay time)OFF
(ON)
Alarm soundingON
HINT:
Even in disarmed state, the indicator light flash. (Due to the sig-
nal output form immobilizer system). The indicator always
flashes receiving the signal from the immobilizer system at any
time in the arming condition.
Flashing frequency:
0.2 seconds (ON)
1.8 seconds (OFF)
(a) Transfer to active mode:
In each passive mode, when ºdisarmed state of active
mode " arming preparation transfer conditionº is met, the
active mode transfers to each condition. In this case, ac-
tive mode continues till disarmed state.
Passive mode when transfer condition is
met.Active mode transfer condition
Disarmed stateArming preparation condition
Arming preparation conditionArming preparation condition
Armed state
(During entry delay time)Arming condition
(After alarming time has elapsed, arming
condition)
Alarm soundingAfter alarming time has elapsed, arming
condition
(b) Answer back:
The hazard lights flush as answer back under the follow-
ing conditions.
(1) When the system is set.
When arming preparation is set from disarmed state
using the wireless door lock, the hazard lights flush
once.
(2) When the system is released.
When disarmed state is set from either arming prep-
aration, armed state or alarm sounding using the
wireless door lock, the hazard lights flush twice.