2001 TOYOTA PRIUS display

A14009
ON
SPD
(+) (±)
AT7809
4.5 ~ 5.5 V
0
DI±106
± DIAGNOSTICSENGINE
2001 PRIUS (RM778U)
1 Check operation of speedometer.
CHECK:
Drive the vehicle and check if the operation of the speedmeter in the combination meter is normal.
HINT:
The ABS ECU is operating normally if the speedometer display is normal.
NG Check and replace combination meter (See
page BE±2) and ABS ECU (See page
IN±41).
OK
2 Check voltage between terminal SPD of ECM connector and body ground.
PREPARATION:
(a) Remove the ECM with connector still connected (See
page SF±62).
(b) Drive the vehicle.
CHECK:
Measure voltage between terminal SPD of ECM connector and
body ground when the wheel is turned slowly.
OK:
Voltage is generated intermittently.
NG Check and repair harness and connector
between combination meter and ECM.
OK
Check and replace ECM (See page IN±41).

A14055
BatteryEAN1
Noise
Filter Engine Room J/B
Ignition SW Instrument
Panel J/B3
B±R I4 Ignition Coil
and Igniter No. 4
1ECM
14
Y
E7
E7
E7
E7 13
12
25IGT4
IGT3
IGT2
IGF
E711
IGT1 1
2
4
G
W
B±R
B±R
Y±G 3
4
2 1I3 Ignition Coil
and Igniter No. 3
3
4
2 1I2 Ignition Coil
and Igniter No. 2
2 I1 Ignition Coil
and Igniter No. 1
1
3
4
B±W
B±W
B±W
B±W
B±W
B±W
B±RB±RB±R
B±R
W±B W±B
W±B
W±B
W±B
W±B
B±W
W±B B±W
W±R
B±W IG2 Relay
5
1 3
29
1J
3
1J 2
1A
3
1K
AM2
2
1B
B
F12
12G 11
2B 5
2C 22G 1
B±W
W±R
67
IG2AM2
FL
Block
No. 1
F13
1
B±G
FL
Block
No. 2
MAIN
W±B
A
AJ7
J/C
W±B
A
J1
J/C
IE
B±W
DI±116
± DIAGNOSTICSENGINE
2001 PRIUS (RM778U)
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:

If DTC P1300 is displayed, check No.1 ignition coil with igniter circuit.

If DTC P1305 is displayed, check No.2 ignition coil with igniter circuit.

If DTC P1310 is displayed, check No.3 ignition coil with igniter circuit.

If DTC P1315 is displayed, check No.4 ignition coil with igniter circuit.

Read freeze frame data using TOYOTA hand±held tester or OBD II scan tool. Because freeze frame
records the engine conditions when the malfunction is detected, when troubleshooting it is useful for
determining whether the vehicle was running or stopped, the engine warmed up or not, the air±fuel
ratio lean or rich, etc. at the time of the malfunction.

B04757
DI82K±02
A14091
F12396
DLC3
TOYOTA Hand±held Tester
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±177
2001 PRIUS (RM778U)
PRE±CHECK
1. PRECAUTION
(a) When distinguishing trouble and replace the defective
part, take necessary preventive measures against an
electric shock (See page IN±4).
(b) Some portions of the wiring harness in the THS vehicle
have circuits to which a high voltage is applied. To prevent
an electrical shock, be sure to observe the following:
(1) Wear insulated gloves during inspection.
(2) Remove a service plug and do not start any repair
operation before 5 minutes have passed. Then,
confirm that the voltage at the output terminals has
dropped down to 12 V or less.
(3) Use insulated tools during inspection.
(4) When disengaging the wiring connectors, hold the
connector bodies to avoid pulling the wires. When
engaging the wiring connectors, be sure to engage
them securely.
(c) Do not leave the tools or parts (bolts, nuts, etc.) inside the
cabin.
(d) Do not carry metallic objects such as mechanical pencils
or scales.
2. DIAGNOSIS SYSTEM
(a) Description

The HV control ECU has a self±diagnosis system
by which malfunction in the computer itself or in
THS components is detected and the Hybrid ve-
hicle warning light in the multi±information display
are lighted up.

To check the Diagnostic Trouble Codes (DTC), con-
nect the hand±held tester to the Data Link Connec-
tor 3 (DLC3) on the vehicle. The TOYOTA hand±
held tester also enables you to erase the DTC and
check freeze frame data and various forms of THS
data.

A04550
DLC3
912 3 4 56 78
16 15 14 13 12 11 10
DI±178
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
2001 PRIUS (RM778U)

Freeze frame data:
As the freeze frame data records the driving condi-
tion when a malfunction is detected, when trouble-
shooting, it is useful for determining whether the ve-
hicle was running, braked, stopped or reversed.
(b) Check the DLC3.
The HV control ECU conforms to ISO 14230 for commu-
nication.
The terminal arrangement of the DLC3 complies with
SAEJ1962 and matches the ISO 14230 format.
Terminal No.Connection/Voltage or ResistanceCondition
7Bus
Line/Pulse generationDuring transmission
4Chassis Ground e Body Ground/1 W or lessAlways
5Signal Ground e Body Ground/1 W or lessAlways
16Battery Positive e Body Ground/10 ± 15 VAlways
HINT:
If your display shows UNABLE TO CONNECT TO VEHICLE
when you have connected the cable of the TOYOTA hand±held
tester to the DLC3, turned the motor switch ON and operated
the tester, there is a problem in the vehicle or tool.

If communication is normal when the tool is connected to
another vehicle, inspect the DLC3 on the original vehicle.

If communication is still not possible when the tool is con-
nected to another vehicle, the problem is probably in the
tool itself, so consult the Service Department.
3. INSPECT DIAGNOSIS
(a) Check the auxiliary battery.
(1) Measure the voltage of the auxiliary battery.
Voltage: 10 ± 15 V
(2) Inspect the auxiliary battery, fuses, fusible links, wir-
ing harness, connectors and ground.

A14089
B12009
F12396
DLC3
TOYOTA Hand±held Tester
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±179
2001 PRIUS (RM778U)
(b) Check the master warning light.
(1) Turn the ignition switch ON and confirm that the
master warning light comes on.
HINT:
If the master warning light does not come on, suspect a burnt
fuse, burnt bulb, or open in wiring harness.
(2) When the ºREADYº light is ON, the master warning
light should go off.
If the lamp remains on, the diagnosis system has detected a
malfunction in the system or the meassage such as ºWhen you
park your care, make sure you shift to Park P.º and ºThe batter-
ies will not charge if the shifter is Nº appears on the multi±in-
formation display.
Since DTC may be stored even though the lamp is OFF, be sure
to check DTC.
(c) Check the DTC.
(1) Prepare a TOYOTA hand±held tester.
(2) Connect the TOYOTA hand±held tester to the
DLC3.
(3) Turn the ignition switch ON and push the TOYOTA
hand±held tester main switch ON.
(4) Use the TOYOTA hand±held tester to check the
DTC, information code and freeze frame data and
note them down. (For operating instructions, see
the TOYOTA hand±held tester operator's manual).
HINT:

For one DTC, the HV diagnosis system can memorize
more than one information code and freeze frame data
corresponding to them. Therefore, when troubleshooting,
check all of the information codes, record the freeze
frame data and then start inspection according to the pro-
cedures of ºCircuit Inspectionº.

The HV ECU is communicating with each ECU of the en-
gine brake, HV battery and EMPS. So, if a warning is out-
put from the HV control system, check and record DTCs
of all ECUs. (See tables on the following pages.)
(5) See a related page to confirm details of the DTC.

± 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

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

B04757
DI820±01
A14089A14090
± DIAGNOSTICSHV BATTERY CONTROL SYSTEM
DI±315
2001 PRIUS (RM778U)
PRE±CHECK
1. PRECAUTION
(a) To distinguish a trouble and replace a defective part, take
necessary preventive measures against an electric shock
(See page IN±4).
(b) Some portions of the wiring harness in the THS vehicle
have the circuits, to which a high voltage is applied. To
prevent an electrical shock, be sure to observe the follow-
ing:
(1) Wear insulated gloves during inspection.
(2) Remove a service plug and do not start any repair
operation before 5 minutes have passed, then con-
firm that the voltage at the output terminals has
dropped down to 12 V or less.
(3) Use insulated tools during inspection.
(4) When disengaging wiring connectors, hold the con-
nector bodies to avoid pulling the wires. When en-
gaging wiring connectors, be sure to engage them
securely.
(c) Do not leave tools or parts (bolts, nuts, etc.) inside the
cabin.
(d) Do not carry metallic objects such as mechanical pencils
or scales.
2. DIAGNOSIS SYSTEM
(a) Description

The HV Battery ECU has a self±diagnosis system
by which malfunction in the computer itself or in Hy-
brid System is detected and the master warning
light in the combination meter and the Hybrid sys-
tem warning light in the multi±information display
lights up.