Speed sensor TOYOTA RAV4 1996 Service Service Manual

DI41F−02
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
DI−239
1996 RAV4 (RM447U)
DIAGNOSTIC TROUBLE CODE CHART
If a malfunction code is displayed during the DTC check, check the circuit listed for that code. For details
of each code, turn to the page referred to under the ”See page” for the respective ”DTC No.” in the DTC chart.
HINT:
Using SST 09843−18020, connect the terminals Tc and E1, and remove the short pin.
If any abnormality is not found when inspect each inspection parts, inspect the ECU.
DTC No.
(See page)Detection ItemTrouble Area
11
(DI−246)Open circuit in ABS control (solenoid) relay circuit
ABS control (solenoid) relay
Open or short in ABS control (solenoid) relay circuit
ECU
12
(DI−246)Short circuit in ABS control (solenoid) relay circuit
ABS control (solenoid) relay
B+ short in ABS control (solenoid) relay circuit
ECU
*3 13
(DI−250)Open circuit in ABS control (motor) relay circuit
ABS control (motor) relay
Open or short in ABS control (motor) relay circuit
ECU
14
(DI−250)Short circuit in ABS control (motor) relay circuit
ABS control (motor) relay
B+ short in ABS control (motor) relay circuit
ECU
21
(DI−254)Open or short circuit in 2−position solenoid circuit for right front
wheelABS actuator
Open or short in SFRR or SFRH circuit
ECU
22
(DI−254)Open or short circuit in 2−position solenoid circuit for left front
wheelABS actuator
Open or short in SFLR or SFLH circuit
ECU
23
(DI−254)Open or short circuit in 2−position solenoid circuit for right rear
wheelABS actuator
Open or short in SRRR or SRRH circuit
ECU
24
(DI−254)Open or short circuit in 2−position solenoid circuit for left rear
wheelABS actuator
Open or short in SRLR or SRLH circuit
ECU
*3 31
(DI−257)Right front wheel speed sensor signal malfunction
Right front, left front, right rear or left rear speed sensor
Open or short in each speed sensor circuit
Speed rotor
ECU*3 32
(DI−257)Left front wheel speed sensor signal malfunction
*3 33
(DI−257)Right rear wheel speed sensor signal malfunction
*3 34
(DI−257)Left rear wheel speed sensor signal malfunction
*2 35
(DI−257)Open circuit in speed sensor circuitOpen in speed sensor circuit
*1 37
(DI−261)Some tire is different size from other tiresTire size
ECU
41
(DI−262)Low battery positive voltage
Abnormal high battery positive voltage (2WD Vehicles)
Battery
IC regulator
Open or short in power source circuit
ECU
*2 43
(DI−266)Malfunction in deceleration sensor (constant output)
Deceleration sensor
Wire harness for deceleration sensor system
ECU

DI−240
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
1996 RAV4 (RM447U)*
2 44
(DI−267)Open or short in deceleration sensor circuit
Deceleration sensor
Open or short in deceleration sensor circuit
ECU
*2 45
(DI−266)Malfunction in deceleration sensorDeceleration sensor
Wire harness for deceleration sensor system
51
(DI−269)Pump motor is locked
Open in pump motor groundABS pump motor
Always ON
(DI−270)Malfunction in ECU
Abnormal high battery positive voltage (2WD Vehicles)
Battery *1
IC regulator *1
Open or short in pwer source circuit *1
ECU
*1: 2WD models
*
2: 4WD models
*
3: As the DTC cannot be erased by replacing parts alone, do either of the following operations.
1. Clear DTC (See page DI−234).
2. At the vehicle speed of 20 km/h (12 mph), drive the vehicle for 30 sec. or more.

DI41I−02
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
DI−245
1996 RAV4 (RM447U)
PROBLEM SYMPTOMS TABLE
If a normal code is displayed during the DTC check but the problem still occurs, check the circuits for each
problem symptom in the order given in the table below and proceed to the relevant troubleshooting page.
SymptomsSuspected AreaSee page
ABS does not operate
Only when 1 − 4 are all normal and the problem is still occuring, replace the ABS
ECU
2. Check the DTC, reconfirming that the normal code is output
3. IG power source circuit
4. Speed sensor circuit
5. Check the ABS actuator with a checker
If abnormal, check the hydraulic circuit for leakage (See page DI−282)
DI−234
DI−262
DI−257
BR−35
ABS does not operate effi-
ciently
Only when 1 − 4 are all normal and the problem is still occuring, replace the ABS
ECU
1. Check the DTC, reconfirming that the normal code is output
2. Speed sensor circuit
3. Stop light switch circuit
4. Check the ABS actuator with a checker
If abnormal, check the hydraulic circuit for leakage (See page DI−282)
DI−234
DI−257
DI−273
BR−35
ABS warning light abnormal1. ABS warning light circuit
2. ABS ECUDI−275
−
DTC check cannot be done
Only when 1 and 2 are all normal and the problem is still occuring, replace the ABS
ECU
1. ABS warning light circuit
2. Tc terminal circuit
DI−275
DI−278
Speed sensor signal check
cannot be done1. Ts terminal circuit
2. ABS ECUDI−280
−

BR3583
BR3582F00010
RotorSpeed Sensor
Magnet
To ECU
Low Speed High SpeedN S
+V
−V
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
DI−257
1996 RAV4 (RM447U)
DTC 31, 32, 33, 34, 35 Speed Sensor Circuit
CIRCUIT DESCRIPTION
The speed sensor detects the wheel speed and sends the ap-
propriate signals to the ECU. These signals are used to control
the ABS system. The front and rear rotors each have 48 serra-
tions.
When the rotor rotate, the magnetic field emitted by the perma-
nent magnet in the speed sensor generates an AC voltage.
Since the frequency of this AC voltage changes in direct propor-
tion to the speed of the rotor, the frequency is used by the ECU
to detect the speed of each wheel.
DTC No.DTC Detecting ConditionTrouble Area
31, 32, 33, 34
Detection of any of conditions 1 through 3:
1. At vehicle speed of 10 km/h (6 mph) or more, pulses are not
input for 5 sec.
2. Momentary interruption of the speed sensor signal occurs
at least 7 times in the time between switching the ignition
switch ON and switching it OFF
3. Abnormal fluctuation of speed sensor signals with the ve-
hicle speed 20 km/h (12 mph) or more
Right front, left front, right rear or left rear speed sensor
Open or short in each speed sensor circuit
Sensor rotor
ECU
*35
Speed sensor signal is not input for about 1 sec. while the
speed sensor signals are being checked at vehicle speed of 0
km/hOpen in speed sensor circuit
ECU
*: 4WD models
HINT:
DTC No. 31 is for the right front speed sensor.
DTC No. 32 is for the left front speed sensor.
DTC No. 33 is for the right rear speed sensor.
DTC No. 34 is for the left rear speed sensor.
Fail safe function:
If trouble occurs in the speed sensor circuit, the ECU cuts off current to the ABS control (solenoid) relay and
prohibits ABS control.
DI98Z−01

R14676
21
R14669
1 2
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
DI−259
1996 RAV4 (RM447U)
INSPECTION PROCEDURE
1 Check speed sensor.
Front
PREPARATION:
Disconnect the speed sensor connector.
CHECK:
Measure the resistance between terminals 1 and 2 of the speed
sensor connector.
OK:
Resistance: 0.6 − 1.8 kΩ
CHECK:
Measure the resistance between terminals 1 and 2 of the speed
sensor connector and body ground.
OK:
Resistance: 1 MΩ or higher
Rear:
PREPARATION:
Disconnect the speed sensor connector.
CHECK:
Measure the resistance between terminals 1 and 2 of the speed
sensor connector.
OK:
Resistance: 0.6 − 2.05 kΩ
CHECK:
Measure the resistance between terminals 1 and 2 of the speed
sensor connector and body ground.
OK:
Resistance: 1 MΩ or higher
NG Replace speed sensor.
NOTICE:
Check the speed sensor signal last (See page DI−234).
OK
2 Check for open and short in harness and connector between each speed sensor
and ECU (See page IN−30).
NG Repair or replace harness or connector.
OK

R03139
W01942
4WD Models
2WD Models
BR3795
OK
NG
DI−260
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
1996 RAV4 (RM447U)
3 Check sensor rotor and sensor installation
Front:
PREPARATION:
Remove the brake disc (See page SA−20).
CHECK:
Check the sensor rotor serrations.
OK:
No scratches or missing teeth or foreign objects.
CHECK:
Check the sensor tip.
OK:
No scratches or foreign objects on the sensor tip.
CHECK:
Check the front speed sensor installation.
OK:
The installation bolt is tightened properly and there is
no clearance between the sensor and steering
knuckle.
Rear:
PREPARATION:
Remove the axle shaft (See page SA−52) or drive shaft (See
page SA−62).
CHECK:
Check the sensor rotor serrations.
OK:
No scratches or missing teeth or foreign objects.
CHECK:
Check the sensor tip.
OK:
No scratches or foreign objects on the sensor tip.
CHECK:
Check the speed sensor installation.
OK:
The installation bolt is tightened properly and there is
no clearance between the sensor and rear axle carri-
er.
NG Replace speed sensor or rotor.
NOTICE:
Check the speed sensor signal last (See page DI−234).
OK
Check and replace ABS ECU.

DI−266
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
1996 RAV4 (RM447U)
DTC 43, 45 Malfunction is Deceleration Sensor
(4WD Models)
CIRCUIT DESCRIPTION
DTC No.DTC Detecting ConditionTrouble Area
43
Either of the following 1 or 2 is detected:
1. After the battery terminal is connected, input from the decel-
eration sensor does not charge at one cycle (0 km/h →
more than 30 km/h → 0 km/h) for 16 times continuously
2. When the brake pedal is not depressed at vehicle speed of
5 km/h or more, forward and backward G (more than 0.4 G)
is detected for 30 sec. or more
Deceleration sensor
Wire harness for deceleration sensor system
ECU
*45
At vehicle speed of 30 km/h or more, the deceleration sensor
output and vehicle acceleration from wheel speed remain ab-
normally different for 60 sec. or moreDeceleration sensor
Wire harness for deceleration sensor system
INSPECTION PROCEDURE
1 Check deceleration sensor (See page DI−234).
NG Replace deceleration sensor.
OK
2 Check for open or short in harness and connector between sensor and ECU (See
page IN−30).
NG Repair or replace harness and connector.
OK
Check and replace ABS ECU.
DI41P−02

W01940
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
DI−267
1996 RAV4 (RM447U)
DTC 44 Deceleration Sensor Circuit (4WD Models)
CIRCUIT DESCRIPTION
This sensor detects deceleration on the vehicle. The sensor signal is used in ABS control. If the sensor func-
tions abnormally, the ABS warning light comes on but the ABS still operates.
DTC No.TC Detecting ConditionTrouble Area
44
Either of the following 1 or 2 is detected:
1. G switch ON and output voltage of GL1 or GL2 remains 0.5
V or less or 4.5 V or more for more than 1.2 sec.
2. At vehicle speed of 0 km/h, outputs of GL1 and of GL2 re-
mains abnormally different for 60 sec. or more
3. IG switch ON and VGS  4.4 V, VGS  5.5 V continues
for 1.2 sec. or more
Deceleration sensor
Open or short in deceleration sensor circuit
ECU
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check for open and short in harness and connector between sensor and ECU
(See page IN−30).
NG Repair or replace harness or connector.
OK
DI98Y−01

W01418F15322
EC
A
33
*2*111 E1
ABR BREA1
12 V
DLC1 J2
Junction
Connector
*
1: 2WD Models
*2: 4WD ModelsA16 A17ABS ECU
TsTs 8
LL6
F15316
E1
TsDLC1
DI−280
− DIAGNOSTICSANTI−LOCK BRAKE SYSTEM
1996 RAV4 (RM447U)
Ts Terminal Circuit
CIRCUIT DESCRIPTION
The sensor check circuit detects abnormalities in the speed sensor signal which cannot be detected with
the DTC check. Connecting terminals Ts and E1 of the DLC1 in the engine compartment starts the check.
WIRING DIAGRAM
INSPECTION PROCEDURE
1 Check voltage between terminals Ts and E1 of DLC1.
PREPARATION:
(a) Turn the ignition switch ON.
(b) Measure the voltage between terminals Ts and E1 of the
DLC1.
OK:
Voltage: 10 − 14 V
OK If ABS warning light does not blink even after Ts
and E1 are connected, ECU may be defective.
NG
DI41W−02

N17436CRUISE Indicator Light
DI42I−02
BE4034
ON
OFF1.5 sec 0.5 secWarning
F02201Tc E1
DI−328
− DIAGNOSTICSCRUISE CONTROL SYSTEM
1996 RAV4 (RM447U)
PRE−CHECK
1. DIAGNOSIS SYSTEM
(a) Check the indicator.
(1) Turn the ignition switch to ON.
(2) Check that the CRUISE MAIN indicator light comes
on when the cruise control main switch is pushed
ON, and that the indicator light goes off when the
main switch is pushed OFF.
HINT:
If the indicator check result is not normal, proceed to trouble-
shooting (See page BE−2) for the combination meter
section.
(b) Check the DTC.
HINT:
If a malfunction occurs in the vehicle speed sensors or actuator,
etc. during cruise control driving, the ECU actuates AUTO CAN-
CEL of the cruise control and blinks the CRUISE MAIN indicator
light to inform the driver of a malfunction. At the same time, the
malfunction is stored in memory as a DTC.
(c) Output of DTC using diagnosis check wire.
(1) Turn the ignition switch to ON.
(2) Using SST, connect terminals Tc and E
1 of DLC1.
SST 09843−18020
(3) Read the DTC on the CRUISE MAIN indicator light.
HINT:
If the DTC is not output, inspect the diagnosis circuit (See
page DI−374).
As an example, the blinking patterns for codes; normal,
11 and 21 are shown in the illustration.