wheel TOYOTA RAV4 1996 Service Repair Manual

1999-2000 BRAKES
Anti-Lock - RAV4
DESCRIPTION
Anti-Lock Brake System (ABS) consists of hydraulic actuator, solenoids, pump motor, ABS Electronic Control
Unit (ECU), relays, deceleration sensor (4WD) and wheel speed sensors. See Fig. 1
.
An ABS warning light is located on the instrument cluster. Warning light comes on for 3 seconds as a bulb test
when ignition is turned on. A primary check is performed after each engine start and initial vehicle speed
exceeds 6 MPH. An actuator noise is heard as vehicle is started or as speed exceeds 6 MPH. This is normal.
Anti-lock systems remains active until vehicle speed drops below 3 MPH.

1999 Toyota RAV4
1999-2000 BRAKES Anti-Lock - RAV4

1999 Toyota RAV4
1999-2000 BRAKES Anti-Lock - RAV4
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Fig. 1: Locating ABS Components
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
OPERATION
Under normal driving conditions, ABS functions as a standard brake system. With detection of wheel lock-up,
short pedal pulsations occurring in rapid succession will be felt in brake pedal. Pedal pulsation will continue
until there is no longer a need for ABS function or until vehicle speed falls below 3 MPH. Maintaining a
constant force on the brake pedal provides shortest stopping distance.
BLEEDING BRAKE SYSTEM
MASTER CYLINDER
Ensure brake fluid reservoir is full. Disconnect brakelines from master cylinder. Have an assistant slowly
depress brake pedal and hold. Block off outlet ports on master cylinder with finger, then have assistant release
brake pedal. Repeat 3 or 4 times or until master cylinder is bled.
BRAKELINES
Install bleeder hose with container of clean brake fluid on wheel cylinder or caliper. Depress brake pedal several
times and hold, then loosen bleeder valve. Tighten bleeder valve when fluid flow stops, then release brake
pedal. Repeat until air bubbles are no longer present for each wheel.
TROUBLE SHOOTING
PRELIMINARY INSPECTION
Begin diagnosis with a basic visual inspection of brake fluid level, tire size and other mechanical brake system
components which may affect anti-lock operation. Check system sensors, wire harnesses and connectors for
proper installation, routing and connection. Ensure all system fuses are okay. Repair as necessary. NOTE: For more information on brake system, see DISC & DRUM
- FWD CARS article.
CAUTION: See ANTI-LOCK BRAKE SAFETY PRECAUTIONS article in GENERAL
INFORMATION.
CAUTION: Brake fluid will damage painted surfaces. If brake fluid contacts a painted
surface, wipe off immediately and clean with alcohol. Use only DOT 3
brake fluid from a sealed container. DO NOT mix brake fluid with any other
type.
NOTE: Bleed brakes from farthest wheel first to closest wheel.

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1999-2000 BRAKES Anti-Lock - RAV4
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DTC 21, DTC 22, DTC 23 & DTC 24: ABS ACTUATOR SOLENOID CIRCUIT
Circuit Description
This solenoid turns on when signals are received from ABS ECU and controls pressure acting on calipers/wheel
cylinders, thus controlling braking force. If malfunction occurs in actuator solenoid circuit, ABS ECU cuts off
current to ABS control relay and prohibits ABS control.
DTC Detecting Conditions
If the following conditions continue for .05 seconds or more, DTC will set. Voltage at ABS control relay
connector terminal A9-1 is less than 1.5 volts, and one of the following conditions is met:
If power transistor of ABS ECU is on, and voltage at terminal SFRR or terminal SFRH is zero volts or
battery voltage is detected, DTC 21 will set.
If power transistor of ABS ECU is on, and voltage at terminal SFLR or terminal SFLH is zero volts or
battery voltage is detected, DTC 22 will set.
If power transistor of ABS ECU is on, and voltage at terminal SRRR or terminal SRRH is zero volts or
battery voltage is detected, DTC 23 will set.
If power transistor of ABS ECU is on, and voltage at terminal SRLR or terminal SRLH is zero volts or
battery voltage is detected, DTC 24 will set.
Diagnostic Procedure
1. Disconnect 2 ABS actuator connectors. Check continuity between actuator connector terminal A7- 4 and
actuator connector terminals A6-1 through A6-8. See Fig. 6
. Continuity should exist at each pair of
terminals. Check resistance at each pair of terminals. Resistance should be 4.3 ohms for each solenoid
coil at terminals SFRR, SFLR, SRRR and SRLR. Resistance should be 8.8 ohms for each solenoid coil at
terminals SFRH, SFLH, SRRH and SRLH. See WIRING DIAGRAMS
. If continuity and resistance is
as specified, go to next step. If continuity and resistance is not as specified, replace ABS actuator.
2. Check for open or short circuit in wiring harness between ABS ECU and actuator. Repair as necessary.
See WIRING DIAGRAMS
. If circuits are okay, go to next step.
3. Clear DTCs and then recheck for DTCs. See RETRIEVING DTCS
under DIAGNOSIS & TESTING. If
same DTC is output after DTC is cleared, check contact condition of each connection. Repair as
necessar
y. If connections are okay, replace ABS ECU.

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Fig. 6: Testing ABS Actuator Solenoid Coils
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
DTC 31, DTC 32, DTC 33 & DTC 34: SPEED SENSOR CIRCUIT
Circuit Description
Speed sensor detects wheel speed and sends appropriate signals to ABS ECU. These signals are used to control
ABS system. Front and rear sensor rotors each have 48 teeth. When rotor rotates, magnetic field emitted by
permanent magnet in speed sensor generates an AC voltage. Since frequency of this AC voltage changes in
direct proportion to speed of rotor, frequency is used by ABS ECU to detect speed of each wheel. If
malfunction occurs in speed sensor circuit, ABS ECU cuts off current to ABS control relay and prohibits ABS
control.
DTC Detecting Condition
Detection of any of the following conditions may set DTCs 31-34:
Vehicle speed is 6 MPH or more and pulses are not input for 30 seconds.
Momentary interruption of speed sensor signal occurs at least 7 times during one ignition cycle.
Abnormal fluctuation of speed sensor signals when vehicle speed is 12 MPH or more.
Diagnostic Procedure
NOTE: To determine which speed sensor circuit is malfunctioning, see DTC

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DTC Detecting Condition
Detection of the following condition may set DTC 41:
At vehicle speed of about 2 MPH or more, if voltage at ABS ECU terminal IG1 is less than 9.5 volts for
10 seconds or more, DTC 41 may set.
Diagnostic Procedure
1. Check charging system voltage. If voltage is 10-14 volts, system is okay. Go to next step. If voltage is not
10-14 volts, repair charging system. Ensure system fuses are okay.
2. Turn ignition off. Remove ABS ECU. Do not disconnect electrical connectors. Turn ignition switch to
ON position. Measure voltage between terminals IG1 and GND at ABS ECU harness connector. See Fig.
3 . If voltage is 10-14 volts, turn ignition off. Condition may be intermittent. Check ABS ECU connectors
for poor connection or damage. Repair as necessary. If connectors are okay, replace ABS ECU. If voltage
is not as specified, go to next step.
3. Measure resistance between ground and GND terminals at ABS ECU harness connector. See Fig. 3
. If
resistance is one ohm or less, go to next step. If resistance is more than one ohm, repair ground circuit
wiring. See WIRING DIAGRAMS
.
4. Remove ECU-IG fuse from instrument panel junction block. If fuse is blown, check for short circuit in all
wiring harnesses and components connected to ECU-IG fuse (ECM, A/C, cruise control, deceleration
sensor, combination meter, sun roof, shift lock, transmission pattern select switch). See WIRING
DIAGRAMS . Repair as necessary. If fuse is not blown, check for open circuit in wiring harness between
battery and ABS ECU. Repair as necessary.
DTC 43 & DTC 45: DECELERATION SENSOR MALFUNCTION (4WD MODELS ONLY)
DTC Detecting Conditions
Detection of the following conditions may set DTCs 43 or 45:
On 2-door models, if output voltage from deceleration sensor does not change for 16 consecutive times or
more when vehicle speed is decreased from 19 MPH to zero MPH, DTC 43 will set.
On 4-door models, after battery cables are connected, if input from deceleration sensor does not change at
one cycle (zero MPH to 19 MPH or more, then back to zero) for 16 consecutive times, DTC 43 will set.
When brake pedal is not depressed at vehicle speed of 3 MPH or more, and forward and backward force
(force of more than 0.4 "G") is detected for 30 seconds or more, DTC 43 will set.
On 2-door models, at vehicle speed of 19 MPH or more, if deceleration sensor output and vehicle
acceleration from wheel speed remains abnormally different for one minute or more, DTC 45 will set.
Diagnostic Procedure
1. Check deceleration sensor. See DECELERATION SENSOR CHECK under COMPONENT TESTS.
Replace sensor as necessary. If sensor is okay, go to next step.
2. Check for open or short circuit in wiring harness between deceleration sensor and ABS ECU. See
WIRING DIAGRAMS
. Repair as necessary. If wiring harness is okay, replace ABS ECU.

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battery.
2. Place Sheet "A" (09990-00163) on actuator checker. Start engine and let idle. Turn actuator checker
SELECTOR switch to FRONT RH position. See Fig. 9
. Press and hold MOTOR switch for a few
seconds. Ensure motor can be heard running. Depress and hold brake pedal for 15 seconds. Ensure brake
pedal does not go down. While holding brake pedal, press MOTOR switch for a few seconds. Ensure
brake pedal does not pulsate.
Fig. 9: Identifying Actuator Checker Switches

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
3. Press and hold POWER switch for a few seconds and ensure brake pedal does not go down. While
holding brake pedal, release POWER switch. Ensure brake pedal goes down. While holding brake pedal,
press MOTOR switch and ensure brake pedal returns. Release brake pedal.
4. Set SELECTOR switch to each of the other wheels and repeat steps 2 -3 . When checking REAR LH
position, press REAR LH POWER switch, instead of POWER switch. Left rear wheel can be checked in
any selector switch position.
5. After checking remaining wheels, press and hold MOTOR switch for a few seconds. Stop engine.
Remove actuator checker and test harnesses. Reconnect vehicle harnesses to actuator and control relay.
Clear diagnostic DTCs. See CLEARING DTCS
under DIAGNOSIS & TESTING.
DECELERATION SENSOR CHECK
NOTE: DO NOT press POWER switch for more than 10 seconds.
NOTE: During deceleration sensor diagnosis, ABS functions like a standard brake

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Fig. 11: Exploded View of ABS Actuator
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
ABS ECU
Removal & Installation
Ensure ignition is off. Disconnect negative battery cable. Access ABS ECU, located at right side of passenger
compartment. See Fig. 1
. Disconnect ABS ECU connectors. Remove ABS ECU from vehicle. To install,
reverse removal procedure.
FRONT SENSOR ROTOR
Removal & Installation
Front sensor is part of front hub. For removal and installation of front hub, see AXLE SHAFTS - RAV4 article
in DRIVE AXLES.
REAR SENSOR ROTOR
Removal & Installation
Rear sensor rotor is pressed onto axle shaft. For axle shaft removal and installation procedure, see AXLE
SHAFTS - RAV4 article in DRIVE AXLES.
FRONT WHEEL SPEED SENSORS
Removal & Installation
1. Raise and support front of vehicle. Remove front wheel. Remove inner fender panel. Disconnect wheel
speed sensor connector. Remove clamp bolts holding sensor harness to body, strut assembly and steering
knuckle.
2. Remove wheel speed sensor mounting bolt. Remove wheel speed sensor from steering knuckle. To
install, reverse removal procedure. Ensure wheel speed sensor is flat against knuckle when bolt is
tightened. Tighten wheel speed sensor mounting bolt to specification. See TORQUE
SPECIFICATIONS .
REAR WHEEL SPEED SENSORS
Removal & Installation
1. Remove rear seat cushion and side trim panel. Raise and support vehicle. Remove wheel. Unplug wheel
speed sensor connector and remove wire harness from grommet. Disconnect parking brake cable from
suspension arm. Remove clamp bolts holding sensor wiring harness to body and suspension arm.
2. Remove wheel speed sensor. To install, reverse removal procedure. Ensure wheel speed sensor is flat NOTE: Front hub must be removed to service sensor rotor.

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against knuckle when bolt is tightened. Tighten wheel speed sensor and brake components to
specification. See TORQUE SPECIFICATIONS
.
ADJUSTMENTS
BRAKE BOOSTER PUSH ROD
1. Install adjusting gauge on master cylinder with master cylinder gasket in place. Lower adjusting gauge
pin until pin slightly touches master cylinder piston. See Fig. 12
. Turn adjusting gauge upside-down and
install on power brake booster.
2. Measure clearance between brake booster push rod and adjusting gauge pin head. See Fig. 12
. Measured
clearance should be zero. If clearance is not zero, adjust brake booster push rod length until push rod
lightly touches adjusting gauge pin head.
Fig. 12: Adjusting Master Cylinder Push Rod

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
BRAKE PEDAL HEIGHT
1. Remove instrument panel lower finish panel. Brake pedal height is measured from face of brake pedal
pad to asphalt sheet under carpet. See Fig. 13
.
2. Brake pedal height should be 6.19-6.58" (157.2-167.2 mm). To adjust brake pedal height, disconnect
stoplight switch connector. Loosen stoplight switch lock nut and remove switch. Loosen lock nut on
brake pedal push rod. Adjust pedal height by turning push rod.
3. After adjusting brake pedal height, tighten push rod lock nut. Adjust stoplight switch. See STOPLIGHT
SWITCH . Check and adjust brake pedal free play. See BRAKE PEDAL FREE PLAY.

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1999-2000 BRAKES Anti-Lock - RAV4
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Brake pedal depressed height is measured from face of brake pedal pad to asphalt sheet under carpet with
brakes applied. Measure brake pedal depressed height with engine running and weight of 110 lbs. (50 kg)
applied against brake pedal. Minimum brake pedal depressed height should be 2.95" (75.0 mm). If measured
distance is less than minimum height, inspect brake system.
TORQUE SPECIFICATIONS
TORQUE SPECIFICATIONS
WIRING DIAGRAMS
ApplicationFt. Lbs. (N.m)
Actuator Bracket Mounting Bolts14 (19)
Brakeline Fittings11 (15)
Hub Nut83 (110)
Push Rod Lock Nut18 (25)
Speed Sensor Harness-To-Rear Suspension Arm Bolts9 (13)
INCH Lbs. (N.m)
Actuator-To-Bracket Mounting Nuts48 (5.4)
Speed Sensor Harness-To-Body Bolts48 (5.4)
Wheel Speed Sensor Mounting Bolt71 (8)

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AIR BAG RESTRAINT SYSTEM
1996 ACCESSORIES/SAFETY EQUIPMENT Toyota Air Bag Restraint System
DESCRIPTION & OPERATION
Supplemental Restraint System (SRS) deploys a steering wheel pad (driver-side air bag) and passenger-side air
bag during a frontal impact of sufficient force. See Fig. 1. WARNING:To avoid injury from accidental air bag deployment, read and carefully
follow all WARNINGS and SERVICE PRECAUTIONS.

1996 Toyota 4Runner
AIR BAG RESTRAINT SYSTEM 1996 ACCESSORIES/SAFETY EQUIPMENT Toyota Air Bag Restraint System

1996 Toyota 4Runner
AIR BAG RESTRAINT SYSTEM 1996 ACCESSORIES/SAFETY EQUIPMENT Toyota Air Bag Restraint System
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