2001 TOYOTA PRIUS check engine

B00319
Recommended Oil Viscosity (SAE):
10W ± 30
5W ± 30 PREFERRED
TEMPERATURE RANGE ANTICIPATED BEFORE NEXT OIL CHANGE100
38 80 60
27 40
16 0
±720
4 ±18 ±20
±29
°C °F
LU02K±08
B11764
Oil Pressure
Switch
B11765
Oil Pressure Gauge
± LUBRICATIONOIL AND FILTER
LU±1
1307 Author: Date:
2001 PRIUS (RM778U)
OIL AND FILTER
INSPECTION
1. CHECK ENGINE OIL QUALITY
Check the oil for deterioration, entry of water, discoloring or thin-
ning.
If the quality is visibly poor, replace the oil.
Oil grade:
API grade or SJ, Energy±Conserving or ILSAC multi-
grade engine oil is recommended. SAE 5W±30 is the
best choice for your vehicle, for good fuel economy,
and good starting in cold weather.
2. CHECK ENGINE OIL LEVEL
After warming up the engine and then 5 minutes after the en-
gine stop, oil level should be between the ºLº and ºFº marks on
the dipstick.
If low. check for leakage and add oil up to the ºFº mark.
NOTICE:
Do not fill with engine oil above the ºFº mark.
3. REMOVE OIL PRESSURE SWITCH, AND INSTALL OIL
PRESSURE GAUGE
(a) Remove the oil pressure switch.
(b) Install the oil pressure gauge.
4. ACTIVATE INSPECTION MODE AND WARM UP EN-
GINE (See page IN±10)
Allow the engine to warm up to normal operating temperature.
5. CHECK OIL PRESSURE
Oil pressure:
At idle speed
29 kPa (0.3 kgf/cm
2, 4.3 psi) or more
At 2,250 rpm
150 ± 550 kPa (1.5 ± 5.6 kgf/cm
2, 22 ± 80 psi)
6. REMOVE OIL PRESSURE GAUGE AND REINSTALL
OIL PRESSURE SWITCH
(a) Remove the oil pressure gauge.

P12478
Adhesive
LU±2
± LUBRICATIONOIL AND FILTER
1308 Author: Date:
2001 PRIUS (RM778U)
(b) Apply adhesive to 2 or 3 threads of the oil pressure switch.
Adhesive:
Part No. 08833±00080, THREE BOND 1344,
LOCTITE 242 or equivalent
(c) Install the oil pressure switch.
Torque: 13 N´m (130 kgf´cm, 9 ft´lbf)
7. START ENGINE AND CHECK FOR LEAKS

IG0EP±07
± IGNITIONIGNITION SYSTEM
IG±1
1318 Author: Date:
2001 PRIUS (RM778U)
IGNITION SYSTEM
ON±VEHICLE INSPECTION
NOTICE:
ºColdº and ºHotº in these sentences express the tempera-
ture of the coils themselves. ºColdº is from ±10°C (14°F) to
50°C (122°F) and ºHotº is from 50°C (122°F) to 100°C
(212°F).
1. INSPECT IGNITION COIL (WITH IGNITER) AND
SPARK TEST
Check that the spark occurs.
(1) Remove the ignition coils (with igniter) (See page
IG±6).
(2) Using a 16 mm (0.63 in.) plug wrench, remove the
spark plugs.
(3) Install the spark plugs to each ignition coils (with ig-
niter), and connect the ignition coil connectors.
(4) Disconnect the 4 injector connectors.
(5) Ground the spark plugs.
(6) Check if spark occurs while engine is being
cranked.
NOTICE:
To prevent gasoline from being injected from injectors dur-
ing this test, crank the engine for no more than 5 ± 10 se-
conds at time.

F12196
F12214
Matchmarks
A
B
SR±26
± STEERINGELECTRIC POWER STEERING GEAR
2001 PRIUS (RM778U)
4. CONNECT EMPS BRACKET AND 2 CONNECTORS
(a) Connect the EMPS bracket with the 2 bolts.
Torque: 5.5 N´m (60 kgf´cm, 52 in.´lbf)
(b) Connect the earth wire with the bolt.
Torque: 5.5 N´m (60 kgf´cm, 52 in.´lbf)
(c) Connect the 2 clamps.
(d) Connect the 2 connectors.
5. CONNECT LOWER SUSPENSION ARM TO LOWER
BALL JOINT (See page SA±43)
6. CONNECT STABILIZER BAR (See page SA±43)
7. CONNECT NO. 2 INTERMEDIATE SHAFT ASSEMBLY
(a) Put the dust seal back to the engine compartment side.
(b) Remove the vinyl tape from the serrated part of the control
valve shaft.
(c) Align the matchmarks on the No. 2 intermediate shaft as-
sembly and control valve shaft.
(d) Install the bolt ºBº and torque the bolt ºAº.
Torque: 35 N´m (360 kgf´cm, 22 ft´lbf)
8. CONNECT RH AND LH TIE ROD ENDS
(See page SA±14)
9. PLACE FRONT WHEELS FACING STRAIGHT AHEAD
HINT:
Do it with the front of the vehicle jacked up.
10. CENTER SPIRAL CABLE (See page SR±14)
11. INSTALL STEERING WHEEL
(a) Align the matchmarks on the steering wheel and steering
column main shaft.
(b) Temporarily tighten the steering wheel set nut.
12. CHECK STEERING WHEEL CENTER POINT
13. TORQUE STEERING WHEEL SET NUT
Torque: 50 N´m (510 kgf´cm, 37 ft´lbf)
14. INSTALL STEERING WHEEL PAD (See page SR±14)
15. CHECK FRONT WHEEL ALIGNMENT
16. PERFORM CALIBRATION OF TORQUE SENSOR
ZERO POINT (See page DI±454)

BE±4
± BODY ELECTRICALTROUBLESHOOTING
1671 Author: Date:
2001 PRIUS (RM778U) Headlight flickers.
1. Bulb
2. Wire Harness±
±
Headlight is dark.1. Bulb
2. Wire Harness±
±
Taillight does not come on with light control switch in TAIL.1. Taillight Control Relay
2. Wire HarnessBE±20
±
Taillight does not go out with light control switch in OFF.1. Taillight Control Relay
2. Wire HarnessBE±20
±
Headlight does not come on with engine running and light control
switch in OFF.
1. ECU±B Fuse
2. GAUGE Fuse
3. Daytime Running Light Main Relay
4. Daytime Running Light Relay
5. Alternator L Terminal
6. Body ECU
7. Parking Brake Switch
8. Wire HarnessBE±12
BE±12
BE±20
BE±20
±
DI±678
BE±42
±
TURN SIGNAL AND HAZARD WARNING SYSTEM
SymptomSuspect AreaSee page
ºHazardº and ºTurnº do not light up.
1. GAUGE Fuse
2. TURN HAZ Fuse
3. Ignition Switch
4. Turn Signal Flasher Relay
5. Wire HarnessBE±12
BE±12
BE±17
BE±25
±
Hazard warning light does not light up.
(Turn is normal)1. Hazard Warning Switch
2. Wire HarnessBE±25
±
Turn signal does not light up.
(Hazard is normal)1. Turn Signal Switch
2. Wire HarnessBE±25
±
Turn signal does not light up in one direction.1. Turn Signal Switch
2. Wire HarnessBE±25
±
Only one bulb does not light up.1. Bulb
2. Wire Harness±
±
INTERIOR LIGHT SYSTEM
This system uses the multiplex communication system, so check diagnosis system of the multiplex commu-
nication system before you proceed with troubleshooting.
SymptomSuspect AreaSee page
All the lights do not come ON.DOME FuseBE±12
The driver door courtesy light does not come ON when the
driver's door is opened.1. Driver's Door Courtesy Switch
2. Wire Harness
3. Body ECUBE±27
±
±
The passenger door courtesy light does not come ON when the
passenger's door is opened.1. Passenger's Door Courtesy Switch
2. Wire Harness
3. Body ECUBE±27
±
DI±678
The room light does not come on when the rear±right door is
opened.
1. Rear±Right Door Courtesy Switch
2. Wire Harness
3. Body ECU
4. Room LightBE±27
±
DI±678
±
The room light does not come on when the rear±left door is
opened.
1. Rear±Left Door Courtesy Switch
2. Wire Harness
3. Body ECU
4. Room LightBE±27
±
DI±678
±
Only one of the bulbs comes ON.Bulb±

± BODY ELECTRICALTROUBLESHOOTING
BE±9
1676 Author: Date:
2001 PRIUS (RM778U)
POWER 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.
SymptomSuspect AreaSee page
All the doors cannot be locked or unlocked.
(Power Window Control System is normal.)1. Door Lock Control Switch
2. Body ECU
3. Wire HarnessBE±62
DI±678
±
Only one side door lock control does not operate.1. Door Lock Motor
2. Wire HarnessBE±62
±
Door key related function does not operate.
1. Door Key Lock and Unlock Switch
2. Body ECU
3. Wire HarnessBE±62
DI±678
±
Key confinement prevention function does not operate.
1. Key Unlock Warning Switch
2. Door Courtesy Switch
3. Body ECU
4. Wire HarnessBE±17
BE±27
DI±678
±
THEFT DETERRENT 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 theft deterrent system is based on the premise that the door lock control system is
operating normally. Accordingly, before troubleshooting the theft deterrent system, first make certain that
the door lock control system is operating normally.
SymptomSuspect AreaSee page
The theft deterrent system cannot be set
1. Indicator light circuit
2. ECU power source circuit
3. Key unlock warning switch circuit
4. Door key lock and unlock switch circuit
5. Door courtesy switch circuit
6. Door unlock detection switch circuit
7. Engine hood courtesy switch circuitDI±704
DI±685
DI±695
DI±724
DI±714
DI±710
DI±720
The indicator light does not blink when system is set.Indicator light circuitDI±704
When the system is set
(The system does not operate when the rear door is unlocked).Door unlock detection switch circuitDI±710
When the system is set
(The system does not operate when the luggage compartment
door is opened by a method other than the key).
Luggage compartment door courtesy switch circuitDI±722
When the system is set
(The system does not operate when the engine hood is lifted).Engine hood courtesy switch circuitDI±720
While the system is in warning operation
(Horns do not sound).Horn relay circuitDI±697
While the system is in warning operation
(Headlights do not flash).Headlight control relay circuitDI±693
While the system is in warning operation
(Taillights do not flash).Taillight control relay circuitDI±691
While the system is in warning operation
(The door lock is not locked).Door unlock detection switch circuitDI±710
System is still set even when a rear door is openDoor courtesy switch circuitDI±714
Even when the system is not set
(Horns sound).Horn relay circuitDI±697

I17791
0.4 °
3 m (9.84 ft) H 29.7 mm
(1.17 in.)
7
V RH Line
W90 °
V LH Line4
Low Beam:
V LH LineV Line V RH Line 65
6
29.7 mm
(1.17 in.)
High Beam:
V LH LineV Line V RH Line 6
5629.7 mm
(1.17 in.)
29.7 mm
(1.17 in.) H 4
O: step No.
7
H4
W
W
± BODY ELECTRICALHEADLIGHT AND TAILLIGHT SYSTEM
BE±23
2001 PRIUS (RM778U)
ADJUST HEADLIGHT AIM ONLY
(a) Place the vehicle in the following conditions.

The area around the headlight is not deformed.

The vehicle is parked on a level surface.

Tire inflation pressure is the specified value.

A driver is in the driver's seat and the vehicle is in
a state ready for driving (with a tank full).

The vehicle has been bounced several times.
(b) Check the headlight aiming.
(1) Prepare a thick white paper.
(2) Stand the paper perpendicular to the ground at the
position 9.84 ft away from the headlights.
(3) Ensure that the center line of the vehicle and the pa-
per face forms a 90±degree angle as shown in the
illustration.
(4) Draw a horizontal line (H line) on the paper, showing
where the headlights should strike.
(5) Draw a vertical line (V line) to where the center line
of the vehicle is to be.
(6) Draw 2 vertical lines (by connecting the low and
high beam center marks) to where the both head-
lights should strike (V RH and V LH lines).
(7) Draw a horizontal line (by connecting the both low
beam center marks) to where the headlights should
strike (H RH and H LH lines).
(8) Start the engine.
(9) Turn the headlights ON.
(10) Check that the headlights properly strike the posi-
tion shown in the illustration.
(11) If not, adjust the lights in the vertical direction.
HINT:
As shown in the illustration, adjust each aim of the RH and LH
lights.
(c) When adjusting it in the vertical direction:
Using adjusting bolt, adjust the headlight aim to within the
specified range.

I17865
Fuel Sender Gauge Connector
I17865
Fuel Sender Gauge Connector
I01277
BatteryWarning Light Ignition
Switch
Wire Harness Side
1
I01278
BE±44
± BODY ELECTRICALCOMBINATION METER
2001 PRIUS (RM778U)
5. INSPECT FUEL SENDER GAUGE VOLTAGE
Measure the voltage between terminals 1 and 6 for each fuel
level.
HINT:
The fuel sender gauge cannot be removed.
As the resistance value changes according to the remaining
fuel amount, refer to the above standard value.
Fuel levelResistance (W)
FullApprox. 430
HalfApprox. 1000 ± 2000
EmptyApprox. 5000
If resistance value is not as specified, replace the fuel tank.
If resistance value is as specified, replace the combination me-
ter.
6. INSPECT TEMPERATURE SENDER RESISTANCE
Measure the resistance between terminal 4 and 8
If the resistance value is not in the following area, replace fuel
tank.
1.5 ± 100 (W) at 0 ± 30°C
7. INSPECT LOW OIL PRESSURE WARNING LIGHT
(a) Disconnect the connector from the warning switch and
ground terminal of the wire harness side connector.
(b) Turn the ignition switch ON, check that the warning light
lights up.
If the warning light does not light up, test the bulb or inspect wire
harness.
8. INSPECT LOW OIL PRESSURE SWITCH CONTINUITY
(a) Check that continuity exists between terminal and ground
with the engine stopped.
(b) Check that no continuity exists between terminal and
ground with the engine running.
HINT:
Oil pressure should be over 24.5 kPa (0.25 kgf/cm
2, 3.55 psi)
If operation is not as specified, replace the switch.