wiring diagram TOYOTA PRIUS 2001 Service Service Manual

± DIAGNOSTICSENGINE
DI±57
2001 PRIUS (RM778U)
DTC P0135 Heated Oxygen Sensor Heater Circuit
Malfunction (Bank1 Sensor1)
DTC P0141 Heated Oxygen Sensor Heated Circuit
Malfunction (Bank1 Sensor2)
CIRCUIT DESCRIPTION
Refer to DTC P0125 on page DI±44.
DTC No.DTC Detecting ConditionTrouble Area
P0135
When the heater operates, heater current exceeds 2 A
(2 trip detection logic)
Open or short in heater circuit of heated oxygen sensor
Htd htP0135
P0141Heater current of 0.2 A or less when the heater operates
(2 trip detection logic)
Heated oxygen sensor heater

ECM
HINT:

Bank 1 refers to the bank that includes cylinder No.1.

Sensor 1 refers to the sensor closer to the engine body.

Sensor 2 refers to the sensor farther away from the engine body.
WIRING DIAGRAM
Refer to DTC P0125 on page DI±44.
INSPECTION PROCEDURE
HINT:
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.
DI6V5±02

A09300
Vehicle speed
40 km/h
(25 mph)
Idling(c)(d)
(e)
(a)
IG SW OFF
(b)
(e)
60 sec.
or more(d)
(d) Once
40 sec.
or moreTwice
40 sec.
or more11 times
40 sec.
or more
10 sec. 10 sec.(e)
10 sec.
± DIAGNOSTICSENGINE
DI±59
2001 PRIUS (RM778U)
DTC P0136 Oxygen Sensor Circuit Malfunction
(Bank 1 Sensor 2)
CIRCUIT DESCRIPTION
Refer to DTC P0125 on page DI±44.
DTC No.DTC Detecting ConditionTrouble Area
P0136
Voltage output of the heated oxygen sensor remains at 0.45 V
or more, or 0.55 V or less when the vehicle is driven at 40 km/h
(25 mph) or more after the engine is warmed up.
(2 trip detection logic).

Open or short in heated oxygen sensor circuit

Heated oxygen sensor
HINT:
Sensor 2 refers to the sensor farther away from the engine body.
WIRING DIAGRAM
Refer to DTC P0125 on page DI±44.
CONFIRMATION DRIVING PATTERN
(a) Connect the hand±held tester to the DLC3.
(b) Switch the hand±held tester from the Normal Mode to the Check (Test) Mode (See page DI±3).
(c) Start the engine and let the engine idle for 60 seconds or more.
(d) Drive the vehicle at 40 km/h (25 mph) or more for 40 seconds or more.
(e) Let the engine idle for 10 seconds or more.
(f) Preform steps (d) to (e) 11 times.
HINT:

During performing the steps (d) to (e) 11 times, drive the vehicle at over 65 km and make the fuel cut
happen for over 3 sec.

If a malfunction exists, the MIL will be indicated on the multi information display during step (f).
NOTICE:
If the conditions in this test are not strictly followed, detection of the malfunction will not be possible.
If you do not have a hand±held tester, turn the ignition switch OFF after performing steps (c) to (f),
then perform steps (c) to (f) again.
DI6V6±02

A14053
Battery F13 A
B 1K
1 AM2 Engine RoomJ/B
W±R
71 1A
1E5
6Instrument
Panel J/B65
B±R
IG2
B±GR±W
B±W B±W
B±W
B±WI5
Injector No. 1
1
2C1
21
2
1 2
J1
J/C
B±W
L±W
1 9
2G
2BE8
E8
E7
E7Engine ECU
#10
#20
#30
#40 Y
11 3
I15
Ignition SW W±B1J
12
F12 A
MAIN
I6
Injector No. 2
I7
Injector No. 3
I8
Injector No. 4
1J
1B
AM2
A3
2G2
2
2
J7
J/C
B±W
B±W
B±W
B±WB±W
W±R
IG2
Relay
2 2
1 3
5
1 W±BFL Block No. 1
F18 FL Block No. 2 DI±66
± DIAGNOSTICSENGINE
2001 PRIUS (RM778U)
WIRING DIAGRAM
CONFIRMATION DRIVING PATTERN
(a) Connect the TOYOTA hand±held tester or OBD II scan tool.
(b) Record DTC and the freeze frame data.
(c) Use the TOYOTA hand±held tester to set to Check Mode. (See page DI±3)
(d) Drive the vehicle several times with the engine speed, load and its surrounding range shown with EN-
GINE SPD, CALC LOAD in the freeze frame data or MISFIRE RPM, MISFIRE LOAD in the data list.
If you have no TOYOTA hand±held tester, turn the ignition switch OFF after the symptom is simulated
the first time. Then repeat the simulation process again.
HINT:
In order to memorize DTC of misfire, it is necessary to drive around MISFIRE RPM, MISFIRE LOAD in the
data list for the following period of time.
Engine SpeedTime
1000 rpm3 minutes or more
2000 rpm1 minute 30 seconds or more
3000 rpm1 minute or more
(e) Check whether there is misfire or not by monitoring DTC and the freeze frame data. After that, record
them.

A14027
Knock
SensorECM
KNK1 E7 1
EA1128
B
BR
EB
BR(Shielded)
A
J8 A
J9J/C
± DIAGNOSTICSENGINE
DI±71
2001 PRIUS (RM778U)
DTC P0325 Knock Sensor 1 Circuit Malfunction
CIRCUIT DESCRIPTION
The knock sensor is fitted to the cylinder block to detect engine knocking. This sensor contains a piezoelec-
tric element which generates a voltage when it becomes deformed, which occurs when the cylinder block
vibrates due to knocking. If engine knocking occurs, ignition timing is retarded to suppress it.
DTC No.DTC Detecting ConditionTrouble Area
P0325No knock sensor 1 signal to ECM with engine speed, 2,000
rpm or more
Open or short in knock sensor 1 circuit

Knock sensor 1 (looseness)

ECM
HINT:
If the ECM detects above diagnosis conditions, it operates the fail safe function in which the corrective retard
angle value is set to the maximum value.
WIRING DIAGRAM
DI6V9±02

A14028
1
2R
E7
J/C
J8NE+ NE± C1
Camshaft
Position
Sensor
2
1 C6
Crankshaft
Position
Sensor
E8 E8
BRG
EBECM
BRBRG2
J8
J9 R G
A A
A24
16 10 (Shielded)
(Shielded)
BRG
DI±74
± DIAGNOSTICSENGINE
2001 PRIUS (RM778U)
DTC P0335 Crankshaft Position Sensor ºAº Circuit
Malfunction
CIRCUIT DESCRIPTION
Crankshaft position sensor (NE signal) consist of a signal plate and pick up coil.
The NE signal plate has 34 teeth and is mounted on the crankshaft. The NE signal sensor generates 34
signals of every engine revolution. The ECM detects the standard crankshaft angle based on the G2 signals,
and the actual crankshaft angle the engine speed by the NE signals.
DTC No.DTC Detecting ConditionTrouble Area
No crankshaft position sensor signal to ECM during cranking.
(2 trip detection logic)
Open or short in crankshaft position sensor circuit.

Crankshaft position sensor
P0335No crankshaft position sensor signal to ECM with engine
speed 600 rpm or more
(2 trip detection logic)

Crankshaft osition sensor

Signal plate (Timing belt guide)

Crankshaft timing pulley

ECM
WIRING DIAGRAM
DI6VA±02

DI±76
± DIAGNOSTICSENGINE
2001 PRIUS (RM778U)
DTC P0340 Camshaft Position Sensor Circuit
Malfunction
CIRCUIT DESCRIPTION
Camshaft position sensor (G22 signal) consist of signal plate and pick up coil.
The G22 signal plate has one tooth on its outer circumference and is mounted on the exhaust camshaft.
When the camshafts rotate, the protrusion on the signal plate and the air gap on the pick up coil change,
causing fluctuations in the magnetic field and generating an electromotive force in the pick up coil.
The NE signal plate has 34 teeth and is mounted on the crankshaft. The NE signal sensor generates 34
signals for every engine revolution. The ECM detects the standard crankshaft angle based on the G22 sig-
nals and the actual crankshaft angle and the engine speed by the NE signals.
DTC No.DTC Detecting ConditionTrouble Area
P0340
No camshaft position sensor signal to ECM during cranking.
(2 trip detection logic)
Open or short in camshaft position sensor circuit

Camshaft position sensor
P0340No camshaft position sensor signal to ECM with engine speed
600 rpm or more

Camshaft osition sensor

Camshaft timing pulley

ECM
WIRING DIAGRAM
Refer to DTC P0335 on page DI±74.
INSPECTION PROCEDURE
HINT:
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.
1 Check resistance of camshaft position sensor (Signal generator)
(See page IG±1).
Reference: INSPECTION USING OSCILLOSCOPE
Refer to DTC P0335 on page DI±74 for the INSPECTION USING OSCILLOSCOPE.
NG Replace camshaft position sensor.
OK
DI6VB±02

A14054
11 1A 6
1K
BR 3
1BG±R
1
2 CAIA2
32E9ECM
CCV EVP1
E2
PTNK
VC E7
LE925
2
15V2 VSV
(EVAP)4
TBP Engine Room J/B
B±R 1
1 11F
1 1EFI
Relay
3
2
112
6 B EFI
W±B
BC1
V5 VSV (Purge Flow
Switching Valve) B±G
IE A F12
MAIN
Battery1 5
7 B
BB
C B
4 3
5
2
13
1 1F13
F13
J1
J/CJ7
J/C
A AW±BMREL
29
E9
E8
E9
E818
22 G±R
J/C
J5 J4
IA1 BB19
J4J5 J5J/C
V4
Vapor Pressure
Sensor
Y±RJ8
J/C
Y±R
BC1 BC1 BC1
BC1 BC1BC1
IO1
2
2
2 V6 VSV (Canister Closed Valve)
B
C Y±R
Y±R L±R L±RBRL B±R B CA
AB
R±L
FL Block No. 1
F18
FL Block No. 2 DI±82
± DIAGNOSTICSENGINE
2001 PRIUS (RM778U)
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:

If DTC P0441, P0446, P0450 or P0451 is output after DTC P0440, first troubleshoot DTC P0441,
P0446, P0450 or P0451. If no malfunction is detected, troubleshoot DTC P0440 next.

Ask the customer whether, after the MIL came on, the customer found the fuel tank cap loose and tight-
ened it. Also ask the customer whether the fuel tank cap was loose when refuelling. If the fuel tank cap
was loose, it was the cause of the DTC. If the fuel tank cap was not loose or if the customer was not
sure if it was loose, troubleshoot according to the following procedure.

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 was warmed up or not, the air±fuel
ratio was lean or rich, etc. at the time of the malfunction.

DI±88
± DIAGNOSTICSENGINE
2001 PRIUS (RM778U)DTC No.
DTC Detecting ConditionTrouble Area
P0441
Pressure in fuel tank does not drop during purge control (2 trip
detection logic)
P0441During purge cut±off, pressure in fuel tank is very low
compared with atmospheric pressure (2 trip detection logic)
Open or short in vapor pressure sensor circuit

Vapor pressure sensor

Open or short in VSV circuit for EVAPWhen VSV for CCV is ONpressure in fuel tank is maintained
Open or short in VSV circuit for EVAP
VSV f EVAPWhen VSV for CCV is ON, pressure in fuel tank is maintained
hi (2id i l i)
VSV for EVAPat atmospheric pressure (2 trip detection logic)
Open or short in VSV circuit for purge flow switching valve
P0446
Turning the VSV for purge flow switching valve is ON does not
lower the pressure sensor output.

Oen or short in VSV circuit for urge flow switching valve

VSV for purge flow switching valve

Charcoal canister cracked, hole or damaged
P0446Although the VSV for purge flow switching valve is OFF, fluc-
tuation in the pressure sensor output is great.
Open or short in VSV circuit for CCV

VSV for CCV

ECMTurning the VSV for CCV OFF does not charge the pressure
sensor output.
ECM
WIRING DIAGRAM
Refer to DTC P0440 on page DI±81.
INSPECTION PROCEDURE
HINT:

If DTC P0441, P0446, P0450 or P0451 is output after DTC P0440,first troubleshoot DTC P0441,
P0446, P0450 or P0451. If no malfunction is detected, troubleshoot DTC P0440 next.

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 was warmed up or not, the air±fuel
ratio was lean or rich, etc. at the time of the malfunction.

When the ENGINE RUN TIME in the freeze frame data is less than 200 seconds, carefully check the
VSV for EVAP, charcoal canister and vapor pressure sensor.
TOYOTA hand±held tester:
1 Check whether hose close to fuel tank have been modified, and check whether
there are signs of any accident near fuel tank or charcoal canister (See page
DI±81).
NG Repair or replace.
OK
2 Check that fuel tank cap is TOYOTA genuine parts.
NG Replace to TOYOTA genuine parts.
OK

± DIAGNOSTICSENGINE
DI±103
2001 PRIUS (RM778U)
DTC P0450 Evaporative Emission Control System
Pressure Sensor Malfunction
DTC P0451 Evaporative Emission Control System
Pressure Sensor Range/Performance
CIRCUIT DESCRIPTION
The vapor pressure sensor, VSV for canister closed valve (CCV) and VSV for pressure switching valve are
used to detect abnormalities in the evaporative emission control system.
The ECM decides whether there is an abnormality in the evaporative emission control system based on the
vapor pressure sensor signal.
DTC P0450 or P0451 is recorded by the ECM when the vapor pressure sensor malfunction.
DTC No.DTC Detecting ConditionTrouble Area
P0450
10 seconds or less after engine starting condition (a) or (b)
continues for 7 seconds or more: (2 trip detection logic)
(a) Vapor pressure sensor value < ±4.0 kPa (±30 mmHg, ±1.2
in.Hg)
(b) Vapor pressure sensor value
2.0 kPa (15 mmHg, 0.6
in.Hg)

Open or short in vapor pressure sensor circuit

Vapor pressure sensor
ECM
P0451
Vapor pressure sensor output extremely changes under condi-
tion:
Vehicle speed: 0 km/h (0mph),Engine speed: Idling (2 trip
detection logic)
ECM
WIRING DIAGRAM
Refer to DTC P0440 on page DI±81.
INSPECTION PROCEDURE
HINT:

If DTC P0441, P0446, P0450 or P0451 is output after DTC P0440, first trouble shoot DTC P0441,
P0446 P0450 or P0451. If no malfunction is detected, troubleshoot DTC P0440 next.

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 was warmed up or not, the air±fuel
ratio was lean or rich, etc. at the time of the malfunction.

When the ENGINE RUN TIME in the freeze frame data is less than 200 seconds, carefully check the
VSV for EVAP, charcoal canister and vapor pressure sensor.
DI7SV±01

A00022
From
Speed Sensor4±Pulse4±Pulse
Combination
MeterECM ABS ECU
A14030
C10
Combination
Meter
2A7
V±W Instrument Panel J/B
6
2B J27G
V±W5
E10ECM
SPD J28G
B
LJ/C
± DIAGNOSTICSENGINE
DI±105
2001 PRIUS (RM778U)
DTC P0500 Vehicle Speed Sensor Malfunction
CIRCUIT DESCRIPTION
The speed sensor for ABS detects the wheel speed and sends the appropriate signals to the ABS ECU.
The ECU converts these signals into a 4±pulse signal and output it to the combination meter.
After this signal is converted into a more precise rectangular waveform by the waveform shaping circuit in-
side the combination meter, it is then transmitted to the ECM. The determines the vehicle speed based on
the frequency of these pulse signals.
DTC No.DTC Detecting ConditionTrouble Area
P0500
During vehicle is being driven, no vehicle speed sensor signal
to ECM
(2 trip detection logic)

Combination meter

ABS ECU

Open or short in vehicle speed sensor circuit

Vehicle speed sensor

ECM
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
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.
DI6VG±02