2001 TOYOTA PRIUS air condition

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).

± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±217
2001 PRIUS (RM778U)
DTC P1566 Cruise Control System Malfunction
CIRCUIT DESCRIPTION
The HV ECU and the brake ECU monitor the same STP signal. If any difference is identified between both
received signals, the HV ECU outputs an error.
DTC P1566 ± Information code 116
INF. code.Detecting ConditionTrouble Area
11 6When STP signal of HV ECU is inconsistent with that of brake
ECU, with cruise control indicator ON.
Brake ECU

Wire harness

Stop light switch
WIRING DIAGRAM
Refer to DI±215.
INSPECTION PROCEDURE
1 Is DTC of brake ECU being output (See page DI±351)?
YES Check DTC of brake ECU (See page DI±351).
NO
2 Check for +B short in wire harness between stop light switch and terminals STP,
ST1±of HV ECU (See page IN±41).
HINT:
Under the normal condition, the voltage of the HV ECU STP terminal is 0V when the brake pedal is released
with the ignition OFF. If there is any output of voltage at this time, the stop light switch circuit has +B short.
NG Repair or replace wire harness.
OK
DI82S±02

DI±228
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
2001 PRIUS (RM778U)
CIRCUIT DESCRIPTION
The HV ECU gives warning to the driver and performs the fail safe control, according to the abnormal signal
received from the battery ECU.
DTC P3004 ± Information code 133
INF. Code.Detecting ConditionTrouble Area
133Input of abnormal signal from battery ECU
HV battery system
INSPECTION PROCEDURE
If the information code 133 output, after confirming the DTC of the HV Battery ECU, check and repair the
applicable DTC. After repairing it, record the DTC of the HV ECU, freeze frame data and history of operation.
Then, clear the DTC and check it one more time after starting the system again (ºREADYº light ON).

± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±241
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Check for open and short in wire harness between HV ECU terminals (ETH+,
ETH±) and ECM terminals (ETH+, ETH±) (See page IN±41).
NG Repair or replace wire harness.
OK
Replace ECM.
CIRCUIT DESCRIPTION
DTC P3106 ± Information code 212
INF. Code.Detecting ConditionTrouble Area
212Input of abnormal signal from ECM
ECM
INSPECTION PROCEDURE
If the information code 212 is output, after confirming the DTC of the ECM, check and repair the applicable
DTC. Prior to repairing it, record the DTC of the HV ECU, freeze frame data and history of operation. Then,
clear the DTC and check it one more time after starting the system again (ºREADYº light ON).
CIRCUIT DESCRIPTION
DTC P3106 ± Information code 394
INF. Code.Detecting ConditionTrouble Area
394When ECM does not operate
ECM
INSPECTION PROCEDURE
If the information code 394 is output, check and repair the ECM power source circuit. If there is no problem
in the power source circuit, replace the ECM. Prior to the repair, record the DTC of the HV ECU, freeze frame
data and history of operation and clear them. Then, start the system one more time (ºREADYº light ON) and
check the DTC again.

A14139
Hybrid Vehicle
Control ECU
3
H13ABFS L 23
A18 GSW2 Airbag Sensor
Assembly DI±242
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
2001 PRIUS (RM778U)
DTC P3107 Airbag ECU Communication Circuit Mal-
function
CIRCUIT DESCRIPTION
The HV ECU detects the malfunction of the collision signal circuit from the airbag and gives warning to the
driver.
DTC P3107 ± Information code 213, 214, 215
INF. Code.Detecting ConditionTrouble Area
213
214When communication between airbag ECU and HV ECU is
abnormal 10 sec after ignition is turned ON

Wire harness

Airbag sensor assembly215abnormal 10 sec. after ignition is turned ON
Airbag sensor assembly
WIRING DIAGRAM
DI832±02

DI±246
± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Check for open, short and +B short in wire harness between HV ECU terminals
(HTB+, HTB±, BTH+, BTH±) and brake ECU terminals (HV1+, HV1±, HVO+, HVO±)
(See page IN±41).
HINT:
Confirm that there is no open circuit in the wire harness. If the voltage of each HV ECU terminals (HTB+,
HTB±, BTH+ and BTH±) is always more than 5 V with the ignition ON, the brake ECU communication circuit
has +B short.
NG Repair or replace wire harness.
OK
Replace brake ECU.
CIRCUIT DESCRIPTION
DTC P3109 ± Information code 222
INF. Code.Detecting ConditionTrouble Area
222When abnormal data is received from brake ECU.
Brake ECU
INSPECTION PROCEDURE
If the information code 222 is output, after confirming the DTC of the brake ECU, check and repair the appli-
cable DTC. Prior to repairing it, record the DTC of the HV ECU, freeze frame data and history of operation.
Then, clear the DTC and check it one more time after starting the system again (ºREADYº light ON).

± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±259
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Check open, short and +B short in wire harness between HV transaxle motor
temperature sensor MMT and MMTG terminals and HV ECU MMT and MMTG ter-
minals (See page IN±41).
HINT:
Confirm that there is no open circuit in the wire harness. If the voltage of the HV ECU MMT terminal is always
more than 5V with the ignition ON, the motor temperature sensor circuit has +B short.
NG Repair or replace wire harness.
OK
Check for open in motor temperature sensor and then replace HV transaxle motor.
Check motor temperature sensor (See page HV±40).
CIRCUIT DESCRIPTION
DTC P3120 ± Information code 248, 250
INF. Code.Detecting ConditionTrouble Area
248Motor temperature sensor malfunctionHV t l t250Motor temperature sensor performance problem
HV transaxle motor
INSPECTION PROCEDURE
If the information code 248 or 250 is output, replace the HV transaxle motor.

± DIAGNOSTICSHYBRID VEHICLE CONTROL SYSTEM
DI±265
2001 PRIUS (RM778U)
INSPECTION PROCEDURE
1 Check for open, short and +B short in wire harness between HV transaxle gener-
ator temperature sensor GMT and GMTG terminals and HV ECU GMT and GMTG
terminals (See page IN±41).
HINT:
Confirm that there is no open circuit in the wire harness. If the voltage of the HV ECU GMT terminal is always
more than 5V with the ignition ON, the generator temperature sensor circuit has +B short.
NG Repair or replace wire harness.
OK
Check for open in generator temperature sensor and then replace HV transaxle generator.
Check generator temperature sensor (See page HV±40).
CIRCUIT DESCRIPTION
DTC P3120 ± Information code 258, 260
INF. Code.Detecting ConditionTrouble Area
258Generator temperature sensor malfunctionHV t l ( t )260Generator temperature sensor performance problem
HV transaxle (generator)
INSPECTION PROCEDURE
If the information code 258 or 260 is output, replace the HV transaxle generator.