brake sensor TOYOTA CAMRY 2000 Service Repair Manual

3
CAMRY ± OUTLINE OF NEW FEATURES27
8. Brakes
The specifications of the front and rear brakes have been changed.
9. Suspension
The front and rear springs, stabilizers, and shock absorbers have been modified to realize excellent stability,
controllability, and riding comfort.
10. Steering
A check valve has been added to the power steering gear box to help reduce kickback.
The rack stroke of the 5S-FE engine model has been changed to 145mm (5.71 in.), which is the same as
in the 1MZ-FE engine.
11. Body
Hood support dampers are used.
Two utility hooks added in the luggage room for the gasoline engine model.
To install the fuel tank in the front area of the luggage compartment, the upper back panel has been cut
out for the 5S-FNE engine model.
A performance rod that joins the tops of the right and left rear suspension strut towers has been adopted
for the 5S-FNE engine model.
The shape of the rear floor pan has been changed to prevent the luggage compartment capacity from being
reduced as a result of the installation of the fuel tank in the luggage compartment for the 5S-FNE engine
model.
12. Seat
The seat cover of the LE grade model has been changed.
Optional driver power seat added for the LE grade model.
A fixed type seat back is used for the rear seat for the 5S-FNE engine model.
13. Seat Belt
2-point NR (Non-Retractor) seat belt is used for the rear center seat for the 5S-FNE engine model.
14. Wireless Door Lock Control
Audio answer back is adopted.
15. Lighting
Along with the adoption of the 4-beam headlights, the electrical circuit of the daytime running light system
has been changed.
16. Air Conditioning
The air inlet mode selector of heater control panel has been changed from the lever type to the push button
type on the CE and LE grade model.
When the air outlet mode is set to the DEF or FOOT / DEF mode, the air inlet mode also changes to the
FRESH mode, has been also added on the CE and LE grade model.
A fully automatic controlled type air conditioning is used on the XLE grade model.
A defroster-linked air conditioning start up control has been continuing to use since the previous models
with air conditioning.
17. SRS Airbag
The inflator of the SRS airbag for the driver has been made more compact and lightweight.
A signal that causes the supply of fuel to be cut off during a frontal collision is output by the airbag sensor
assembly to the ECM for the 5S-FNE engine model.

Troubleshooting
If the CO/HC concentration does not comply with
regulations, perform troubleshooting in the order
given below.
(a) Check oxygen sensor operation.
(See page EG1±231)
(b) See the table below for possible causes, then inspect
and correct the applicable causes if necessary.
1. Faulty ignitions:
wIncorrect timing
wFouled, shorted or improperly gapped plugs
wOpen or crossed high±tension cords
wCracked distributor cap
2. Incorrect valve clearance
3. Leaky EGR valve
4. Leaky intake and exhaust valves
5. Leaky cylinder
1. Restricted air filter
2. Faulty MFI/SFI systems
wFaulty pressure regulator
wClogged fuel return line
wDefective engine coolant temp. sensor
wDefective intake air temp. sensor
wFaulty ECM
wFaulty injector
wFaulty throttle position sensor
wMAP sensor 1. Vacuum leaks:
wPCV hose
wEGR valve
wIntake manifold
wThrottle body
w!AC valve
wBrake booster line
2. Lean mixture causing misfire
Rough idle
(Black smoke from exhaust) Rough idle
(Fluctuating HC reading) Rough idleProblems
Causes
Normal
High High High
HighLow
± 5S±FE ENGINEENGINE MECHANICALEG1±22

17. DISCONNECT VACUUM HOSES
Disconnect the following hoses:
(1) MAP sensor hose from air intake chamber
(2) Brake booster vacuum hose from air intake cha±
mber
(3) PS vacuum hose from air intake chamber
(4) Vacuum sensing hose from fuel pressure regula±
tor 1
S. W/ A/C:
DISCONNECT A/C IDLE±UP VALVE CONNECTOR
19. EXCEPT CALIFORNIA:
REMOVE AIR TUBE
(a) Disconnect the following hoses from the air tube:
(1) w/ A/C:
Air hose from ASV
(2) 2 air hoses from PS pump I6. REMOVE EGR VALVE AND VACUUM MODULATOR
(a) Disconnect the EGR gas temperature sensor connec±
tor.
(b) Disconnect the following hoses:
(1) 2 vacuum hoses from VSV (for EGR)
(2) Vacuum hose from charcoal canister
(c) Disconnect the vacuum hose clamp.
(d) Loosen the union nut of the EGR pipe, and remove the
2 nuts, EGR valve, vacuum modulator, vacuum hoses
assembly and gasket.
(b) Remove the 3 bolts, wire clamp and air tube.
± 5S±FE ENGINEENGINE MECHANICALEG1±46

25. INSTALL EGR VALVE AND VACUUM MODULATOR
(a) Install a new gasket and the EGR valve with the union
nut and 2 nuts.
Union nut:
Torque: 59 N±m (600 kgf±cm, 43 ft±lbf)
Nut:
Torque: 13 N±m (130 kgf±cm, 9 ft±lbf)
(b) Install the EGR modulator to the clamp. 23. CONNECT VACUUM HOSES
Connect the following hoses:
(1) MAP sensor hose to air intake chamber
(2) Brake booster vacuum hose to air intake chamber
(3) PS vacuum hose to air intake chamber
(4) Vacuum sensing hose to fuel pressure regulator.
24. w/ A/C:
CONNECT A/C IDLE±UP VALVE CONNECTOR(b) Connect the following hoses:
(1) w/ A/C:
A/C hose (from ASV) to air tube
(2) 2 air hoses (from PS pump) to air tube
(3) 2 vacuum hoses to VSV (for fuel pressure con±
trol)
(4) Vacuum hose to air intake chamber
22. EXCEPT CALIFORNIA:
INSTALL AIR TUBE
(a) Install the air tube and wire clamp with the 3 bolts.
(b) Connect the following hoses to the air tube:
(1) w/ A/C:
Air hose from ASV
(2) 2 air hose from PS pump
± 5S±FE ENGINEENGINE MECHANICALEG1±77

17. M/T:
REMOVE CLUTCH RELEASE CYLINDER WITHOUT
DISCONNECTING TUBE
Remove the 4 bolts, release cylinder and tube from
the transaxle.15. DISCONNECT FUEL INLET HOSE
CAUTION: Catch leaking fuel in a container.
16. M/T:
REMOVE STARTER
19. DISCONNECT VACUUM HOSES
(a) MAP sensor hose from air intake chamber
(b) Brake booster vacuum hose from air intake chamber 18. DISCONNECT TRANSAXLE CONTROL CABLE (S)
FROM TRANSAXLE
± 5S±FE ENGINEENGINE MECHANICALEG1±87

19. M/T:
INSTALL CLUTCH RELEASE CYLINDER
Install the release cylinder and tube with the 4 bolts.
20. M/T:
INSTALL STARTER17. CONNECT VACUUM HOSES
(a) MAP sensor hose to air intake chamber
(b) Brake booster vacuum hose to air intake chamber
18. CONNECT TRANSAXLE CONTROL CABLE
(S) TO TRANSAXLE (c) Charcoal canister vacuum hose
± 5S±FE ENGINEENGINE MECHANICALEG1±131

10. DISCONNECT VACUUM HOSES
Disconnect the following hoses:
(1) MAP sensor hose from air intake chamber
(2) Brake booster vacuum hose from air intake chamber
(3) Vacuum sensing hose from fuel pressure regulator
11. w/ A/C:
DISCONNECT A/C IDLE±UP VALVE CONNECTOR
12. DISCONNECT 2 ENGINE WIRE GROUND STRAPS
FROM INTAKE MANIFOLD
13. DISCONNECT KNOCK SENSOR AND VSV (FOR
EGR) CONNECTORS
14. CALIFORNIA ONLY:
DISCONNECT VSV (FOR FUEL PRESSURE CONTROL)
CONNECTOR AND VACUUM HOSES
15. REMOVE BOLT AND WIRE CLAMP, AND DISCON±
NECT ENGINE WIRE HARNESS 9. REMOVE EGR VALVE AND VACUUM MODULATOR
(a) Disconnect the EGR gas temperature sensor connec-
tor.
(b) Disconnect the following hoses:
(1) 2 vacuum hoses from VSV (for EGR)
(2) Vacuum hose from charcoal canister
(c) Disconnect the vacuum hose clamp.
16. REMOVE INTAKE MANIFOLD
(a) Remove the 4 bolts, wire bracket, No.1 air intake
chamber and manifold stays. (d) Loosen the union nut of the EGR pipe, and remove the
2 nuts, the EGR valve, vacuum modulator, vacuum
hoses assembly and gasket.
± 5S±FE ENGINEMFI/SFI SYSTEMEG1±193

4. CONNECT ENGINE WIRE HARNESS WITH WIRE
CLAMP AND BOLT
5. CALIFORNIA ONLY:
CONNECT VSV (FOR FUEL PRESSURE CONTROL)
CONNECTOR AND VACUUM HOSES
6. CONNECT KNOCK SENSOR AND VSV (FOR EGR)
CONNECTORS
7. CONNECT 2 ENGINE WIRE GROUND STRAPS TO
INTAKE MANIFOLD
10. INSTALL EGR VALVE AND VACUUM MODULATOR
(a) Install a new gasket and the EGR valve with the union
nut and 2 nuts.
Union nut
Torque: 59 N±m (600 kgf±cm. 43 ft±lbf)
Nut
Torque: 13 N±m (130 kgf±cm. 9 ft±lbf)
(b) Install the EGR vacuum modulator to the clamp. 8. CONNECT VACUUM HOSES
Connect the following hoses:
(1) MAP sensor hose to air intake chamber
(2) Brake booster vacuum hose to air intake chamber
(3) Vacuum sensing hose to fuel pressure regulator.
9. w/ A/C:
CONNECT A/C IDLE±UP VALVE CONNECTOR (c) Install the No. 1 air intake chamber and manifold stays,
wire bracket with the 4 bolts.
14 mm head bolt
Torque: 42 N±m (425 kgf±cm, 31 ft±lbf)
12 mm head bolt
Torque: 22 N±m (220 kgf±cm, 16 ft±lbf)
(b) Install a new gasket and the intake manifold with the
6 bolts and 2 nuts. Uniformly tighten the bolts and
nuts in several passes.
Torque: 19 N±m (195 kgf±cm, 14 ft±lbf)
± 5S±FE ENGINEMFI/SFI SYSTEMEG1±199

72CHASSISÐBRAKES
5. Function of Components
No.ComponentFunction
1Slip Indicator LightBlinks to inform the driver when the TRAC system is operated.
2TRAC OFF Indicator Light
Lights to inform the driver when the TRAC system is turned OFF by
the by the TRAC OFF switch. And, blinks to alert the driver when
the ECU detects the malfunction in the TRAC system.
3ECM
Sends signals to the ABS & TRAC ECU, such as the throttle
valve opening angle, specific volume of intake air signal, etc.
Controls the engine output and shift timing in accordance with
the fuel cutoff request and shift timing request that are output by
the ABS & TRAC ECU.
4ABS & TRAC ECU
Judges the vehicle driving condition based on signals from 4 speed
sensors and signals from ECM, and sends fuel cut and shift timing
demand signals to the ECM and brake control signal to the ABS &
TRAC actuator.
5ABS & TRAC Actuator
Controls the brake fluid pressure to each brake wheel cylinder
of the driving wheel (front wheel) by signals from the ABS &
TRAC ECU.
ABS & TRAC
Solenoid RelayDirects electricity to the solenoid valves in the actuator.
6ABS & TRAC
RelayPump Motor
RelayControls the pump motor operation in the actuator.
7Speed Sensors (Front and Rear)Detect the wheel speed of each of four wheels.
8Throttle Position SensorDetects the throttle valve opening angle.
9TRAC OFF SwitchTurns the TRAC system inoperative.

80 CHASSISÐBRAKES
ABS & TRAC ECU
1) Wheel Speed Control
The ABS & TRAC ECU constantly receives signals from 4 speed sensors and calculates the speed of each wheel and
vehicle speed.
During sudden acceleration or driving on a slippery surface, if the drive wheels (front wheels) start to slip, the
difference in speed between the drive wheels are slipping.
Then, the ABS & TRAC ECU executes the right and left independent control of the front wheel brakes, the engine
torque control through fuel cutoff, and shift timing control according to the extent of the slip.
TRAC operation processes are described below.
1. The vehicle speed is determined by way of the rear wheel speed. This speed is then compared to the speed of the
front wheels, which are the drive wheels, to determine the slip condition of the drive wheels (front wheels).
2. The target control speed for the drive wheels is set based on the estimated vehicle speed.
3. If the speed of the front wheels, which are the drive wheels, exceeds the control starting speed, the ABS & TRAC
ECU determines that a slip has occurred and cuts off fuel according to the number of cylinders. By executing
engine torque control and brake control in this manner, the system regulates the speed
so that front wheels attain the target control speed. In addition, the system executes control to
prohibit the shifting of the automatic transaxle at this
time.
4. TRAC control ends when the drive wheels move to non±slippery surface or when the driver releases the
accelerator pedal.