TOYOTA RAV4 2006 Service Repair Manual

BC–38BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEM
BC
(f) Check the yaw rate sensor.
(1) Move the shift lever to P and set the parking
brake lever.
(2) Check that the VSC warning light is blinking as
shown in the illustration.
(3) Keep the vehicle stationary on a level surface for
1 second or more.
(4) Shift the shift lever to the D position and drive
the vehicle at a speed of approximately 5 km/h
(3 mph), and turn the steering wheel either to the
left or right 90
or more to turn the vehicle
through 180
.
(5) Stop the vehicle, move the shift lever into the P
position, and then apply the parking brake.
(6) Check that the skid control buzzer sounds for 3
seconds.
HINT:
• If the skid control buzzer sounds, the signal
check has been completed normally.
• If the skid control buzzer does not sound,
check the skid control buzzer circuit (see
page BC-172).
• If the skid control buzzer still does not sound,
there is a malfunction in the yaw rate sensor,
so check for DTCs.
• Drive the vehicle in a 180
semi circle. At the
end of the turn, the direction of the vehicle
should be within 180 +-5
of its start position.
• Complete the vehicle turn within 20 seconds.
• Do not spin the wheels.
(g) w/ Downhill assist control only:
Check the downhill assist control operation switch.
(1) Check that the VSC warning light is blinking as
shown in the illustration.
(2) Check the downhill assist control switch.
1. Push the downhill assist control switch on.
2. Push the downhill assist control switch off.
C108848E14
F002135E15
C108848E14

BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEMBC–39
BC
(h) w/ Auto LSD only:
Check the end of the sensor.
(1) When the sensor check is successfully
completed, the ABS warning light blinks in the
test mode pattern when the vehicle is stopped,
and goes off when the vehicle is driven.
NOTICE:
If the sensor check is not completed, the
ABS warning light blinks even while the
vehicle is driving and the ABS does not
operate.
(i) Read the DTCs of the signal check function.
(1) Using SST, connect terminals 13 (TC) and 4
(CG) of the DLC3.
SST 09843-18040
(2) Turn the ignition switch ON.
(3) Count the number of blinks of the ABS and VSC
warning light.
HINT:
As an example, the blinking patters of DTCs 71
and 74 are shown below.
NOTICE:
• If only DTCs are displayed, repair the
malfunctioning area and clear the DTCs.
• If the DTCs or test mode codes (DTC of
signal check function) are displayed,
repair the malfunctioning area, clear the
DTCs and perform the test mode
inspection.)
HINT:
• If more than 1 malfunction is detected at the
same time, the lowest numbered code will be
displayed first.
• See the list of DTCs (refer to "DTC OF TEST
MODE FUNCTION (SIGNAL CHECK)"
below).
H100769E17
C132134E01

BC–40BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEM
BC
• If all sensors are normal, a normal system
code is output (the light comes on for 0.25
seconds at intervals of 0.25 seconds).
(4) After the check, disconnect SST from terminals
13 (TC) and 4 (CG) of the DLC3.
(5) Turn the ignition switch OFF.
3. DTC OF TEST MODE FUNCTION (SIGNAL CHECK)
DTC of ABS sensor check function:
DTC of VSC sensor check function:
HINT:
• *: w/ Downhill assist control
• The DTCs in this table are only output in Test Mode.
• The detection of DTCs from C1271/71 to C1274/74 is
completed before the vehicle speed reaches 5 km/h
(3 mph).
• The detection of DTCs from C1275/75 to C1278/78 is
completed before the vehicle speed reaches 45 km/h
(28 mph).
DTC No. Diagnosis Trouble Areas
C1271/71 Low output signal of front speed sensor RH • Front speed sensor RH
• Speed sensor circuit
• Sensor installation
C1272/72 Low output signal of front speed sensor LH • Front speed sensor LH
• Speed sensor circuit
• Sensor installation
C1273/73 Low output signal of rear speed sensor RH • Rear speed sensor RH (for 4WD)
• Skid control sensor RH (for 2WD)
• Speed sensor circuit
• Sensor installation
C1274/74 Low output signal of rear speed sensor LH • Rear speed sensor LH (4WD)
• Skid control sensor LH (2WD)
• Speed sensor circuit
• Sensor installation
C1275/75 Abnormal change in output signal of front
speed sensor RH• Sensor installation
• Speed sensor rotor
• Foreign matter on sensor tip or sensor
rotor
C1276/76 Abnormal change in output signal of front
speed sensor LH• Sensor installation
• Speed sensor rotor
• Foreign matter on sensor tip or sensor
rotor
C1277/77 Abnormal change in output signal of rear
speed sensor RH• Sensor installation
• Speed sensor rotor
• Foreign matter on sensor tip or sensor
rotor
C1278/78 Abnormal change in output signal of rear
speed sensor LH• Sensor installation
• Speed sensor rotor
• Foreign matter on sensor tip or sensor
rotor
C1279/79 Deceleration sensor output voltage
malfunction• Yaw rate sensor
• Sensor installation
C1281/81 Master cylinder pressure sensor output
malfunction• Master cylinder pressure sensor
• Brake pedal load sensing switch (w/ 16-
inch disc)
DTC No. Diagnosis Trouble Areas
C0371/71 Yaw rate sensor Yaw rate sensor
C1379/74* Downhill assist control operation switch Downhill assist control switch

BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEMBC–41
BC
• C1271/71 to C1274/74: The speed output from only
one wheel is extremely low despite other wheel speed
outputs reaching 5 km/h (3 mph).
• C1275/75 to C1278/78: The abnormal speed sensor
output frequency is as shown in the illustration.
F100272E02

BC–42BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEM
BC
PROBLEM SYMPTOMS TABLE
HINT:
• Use the table below to help determine the cause of the
problem symptom. The potential causes of the symptoms
are listed in order of probability in the "Suspected area"
column of the table. Check each symptom by checking the
suspected areas in the order they are listed. Replace parts
as necessary.
• Inspect the fuses and relays related to this system before
inspecting the suspected areas below.
NOTICE:
When replacing the ABS and TRACTION actuator or
sensor, turn the ignition switch OFF.
Vehicle stability control system
Symptom Suspected area See page
ABS, BA and/or EBD does not operate1. Check for DTCs again and make sure that normal system
code displayedBC-47
2. IG power source circuitBC-99
3. Front speed sensor circuitBC-62
4. Rear speed sensor circuitBC-69
5. Check ABS and TRACTION actuator using intelligent tester
(Check ABS and TRACTION actuator operation using ACTIVE
TEST function). If abnormal, check hydraulic circuit for
leakage.BC-180
6. If symptoms still occur even after above circuits in
suspected areas inspected and proved to be normal, replace
ABS and TRACTION actuator (skid control ECU)BC-181
ABS, BA and/or EBD does not operate efficiently1. Check for DTCs again and make sure that normal system
code displayedBC-47
2. Front speed sensor circuitBC-62
3. Rear speed sensor circuitBC-69
4. Stop light switch circuitBC-105
5. Check ABS and TRACTION actuator using intelligent tester
(Check ABS and TRACTION actuator operation using ACTIVE
TEST function). If abnormal, check hydraulic circuit for
leakage.BC-180
6. If symptoms still occur even after above circuits in
suspected areas inspected and proved to be normal, replace
ABS and TRACTION actuator (skid control ECU)BC-181
VSC and/or TRC does not operate1. Check for DTCs again and make sure that normal system
code displayedBC-47
2. IG power source circuitBC-99
3. Check hydraulic circuit for leakage -
4. Front speed sensor circuitBC-62
5. Rear speed sensor circuitBC-69
6. Yaw rate sensor circuitBC-96
7. Steering angle sensor circuitBC-92
8. If symptoms still occur even after above circuits in
suspected areas inspected and proved to be normal, replace
ABS and TRACTION actuator (skid control ECU)BC-181
Sensor signal check cannot be performed1. TS and CG terminal circuitBC-177
2. ABS and TRACTION actuator (skid control ECU)BC-181

BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEMBC–43
BC
HINT:
*1: w/ Downhill assist control
*2: w/ Hill-start assist contol
*3: for 2WD w/ AUTO LSD
DTC check cannot be performed1. Check for DTCs again and make sure that normal system
code displayedBC-47
2. TC and CG terminal circuitBC-174
3. If symptoms still occur even after above circuits in
suspected areas inspected and proved to be normal, replace
ABS and TRACTION actuator (skid control ECU)BC-181
ABS warning light abnormal (Remains on)1. ABS warning light circuitBC-134
2. ABS and TRACTION actuator (skid control ECU)BC-181
ABS warning light abnormal (Does not come on)1. ABS warning light circuitBC-138
2. ABS and TRACTION actuator (skid control ECU)BC-181
VSC warning light abnormal (Remains on)1. VSC warning light circuitBC-139
2. ABS and TRACTION actuator (skid control ECU)BC-181
VSC warning light abnormal (Does not come on)1. VSC warning light circuitBC-142
2. ABS and TRACTION actuator (skid control ECU)BC-181
BRAKE warning light abnormal (Remains on)1. BRAKE warning light circuit -
2. ABS and TRACTION actuator (skid control ECU)BC-144
BRAKE warning light abnormal (Does not come on)1. BRAKE warning light circuitBC-151
2. ABS and TRACTION actuator (skid control ECU)BC-181
SLIP indicator light abnormal (Remains on)1. SLIP indicator light circuitBC-152
2. ABS and TRACTION actuator (skid control ECU)BC-181
SLIP indicator light abnormal (Does not come on)1. SLIP indicator light circuitBC-154
2. ABS and TRACTION actuator (skid control ECU)BC-181
Skid control buzzer abnormal1. Skid control buzzer circuitBC-172
2. ABS and TRACTION actuator (skid control ECU)BC-181
Downhill assist control does not operate*11. Check for DTCs again and make sure that normal system
code displayedBC-47
2. Downhill assist control switch circuitBC-119
3. Downhill assist control indicator light circuitBC-161
4. If symptoms still occur even after above circuits in
suspected areas inspected and proved to be normal, replace
ABS and TRACTION actuator (skid control ECU)BC-181
Downhill assist control indicator light abnormal
(Remains on)*11. Downhill assist control indicator light circuitBC-156
2. ABS and TRACTION actuator (skid control ECU)BC-181
Downhill assist control indicator light abnormal (Does
not come on)*11. Downhill assist control indicator light circuitBC-161
2. ABS and TRACTION actuator (skid control ECU)BC-181
Hill-start assist control does not operate*2 1. ABS and TRACTION actuator (skid control ECU)BC-181
AUTO LSD does not operate*31. Check for DTCs again and make sure that normal system
code displayedBC-47
2. Auto LSD switch circuitBC-169
3. AUTO LSD indicator circuitBC-169
4. If symptoms still occur even after above circuits in
suspected areas inspected and proved to be normal, replace
ABS and TRACTION actuator (skid control ECU)BC-181
AUTO LSD indicator light abnormal (Remains on)*31. AUTO LSD indicator circuitBC-164
2. ABS and TRACTION actuator (skid control ECU)
BC-181
AUTO LSD indicator light abnormal (Does not come
on)*31. AUTO LSD indicator circuitBC-169
2. ABS and TRACTION actuator (skid control ECU)BC-181 Symptom Suspected area See page

BC–44BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEM
BC
TERMINALS OF ECU
1. SKID CONTROL ECU
HINT:
*1: w/ 16-inch disc
*2: w/ Downhill assist control
*3: for 2WD (w/ AUTO LSD)
Symbols (Terminal No.) Terminal Description
GND2 (A19-1) Motor ground
BM (A19-2) Motor relay input
FR+ (A19-3) Front RH wheel speed sensor power supply
FL- (A19-4) Front LH wheel speed signal input
RR+ (A19-5) Rear RH wheel speed signal power supply
RL- (A19-6) Rear LH wheel speed signal input
FSW+ (A19-7)*1 Brake pedal load sensing switch input
CANH (A19-11) CAN communication line H
SP1 (A19-12) Speed signal output for combination meter
MRF (A19-14) Fail safe motor relay output
MR (A19-15) Motor relay output
STPO (A19-16) Stop light relay output
FR- (A19-17) Front RH wheel speed signal input
FL+ (A19-18) Front LH wheel speed sensor power supply
RR- (A19-19) Rear RH wheel speed signal input
RL+ (A19-20) Rear LH wheel speed sensor power supply
STP2 (A19-21) Stop light relay input
TS (A19-24) Sensor diagnosis check input
CANL (A19-25) CAN communication line L
STP1 (A19-27) Stop light switch input
HDCS (A19-28)*2 Downhill assist control switch input
+BS (A19-31) Solenoid valve power supply
GND1 (A19-32) Skid control ECU ground
CSW (A19-43)*3 AUTO LSD switch input
R+ (A19-45) Power supply for motor relay
IG1 (A19-46) ECU power supply
C110610E04

BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEMBC–45
BC
2. CHECK SKID CONTROL ECU
(a) Disconnect the A19 ECU connector.
(b) Measure the voltage and resistance of the wire
harness side connector.
HINT:
The voltage cannot be measured with the connector
connected to the skid control ECU as the connector
is water resistant.
Skid control ECU:
HINT:
*1: w/ 16-inch disc
*2: w/ Downhill assist control
*3: for 2WD (w/ AUTO LSD)
If the result is not as specified, there may be a
malfunction on the wire harness side.
F049377E08
Symbols (Terminal No.) Wiring Color Terminal Description ConditionSpecified Condition
GND2 (A19-1) - Body
groundW-B - Body ground Skid control ECU ground Always Below 1
STP1 (A19-27) - Body
groundL - Body ground Stop light switch input Stop light switch OFF
Brake pedal releasedBelow 1.5 V
STP1 (A19-27) - Body
groundL - Body ground Stop light switch input Stop light switch ON
Brake pedal depressed8 to 16 V
STP2 (A19-21) - Body
groundL - Body ground Stop light relay input Stop light switch OFF
Brake pedal releasedBelow 1.5 V
STP2 (A19-21) - Body
groundL - Body ground Stop light relay input Stop light switch ON
Brake pedal depressed8 to 16 V
STPO (A19-16) - Body
groundW - Body ground Stop light relay output Always 10 to 14 V
+BS (A19-31) - Body
groundW - Body ground Solenoid relay power
supplyAlways 10 to 14 V
IG1 (A19-46) - Body
groundL - Body ground ECU power supply Ignition switch ON 10 to 14 V
HDCS (A19-28)*2 Y - Body ground Downhill assist control
switch inputDownhill assist control
switch ONBelow 1
HDCS (A19-28)*2 Y - Body ground Downhill assist control
switch inputDownhill assist control
switch OFF10 k or higher
FSW+ (A19-7)*1 P - Body ground Brake pedal load sensing
switch inputBrake pedal load sensing
switch ON
Brake pedal released202.4 to 223.7
FSW+ (A19-7)*1 P - Body ground Brake pedal load sensing
switch inputBrake pedal load sensing
switch OFF
Brake pedal released0,95 to 1.05 k
CSW (A19-43)*3 L - Body ground AUTO LSD switch input AUTO LSD switch ON Below 1
CSW (A19-43)*3 L - Body ground AUTO LSD switch input AUTO LSD switch OFF 10 k or higher

BC–46BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEM
BC
3. CHECK INSTRUMENT PANEL JUNCTION BLOCK
(MAIN BODY ECU)
(a) Disconnect the ID junction block connector.
(b) Measure the resistance of the wire harness side
connector.
If the result is not as specified, there may be a
malfunction on the wire harness side.
(c) Reconnect the ID junction block connector.
C126316E01
Symbols (Terminal No.) Wiring Color Terminal Description ConditionSpecified Condition
PKB (ID-4) - Body ground B - Body ground Parking brake switch input Parking brake switch ON Below 1
PKB (ID-4) - Body ground B - Body ground Parking brake switch input Parking brake switch OFF 10 k or higher

BRAKE CONTROL – VEHICLE STABILITY CONTROL SYSTEMBC–47
BC
(d) Measure the voltage of the wire harness side
connector.
If the result is not as specified, the junction block
(ECU) may be a malfunction.
Symbols (Terminal No.) Wiring Color Terminal Description ConditionSpecified Condition
PKB (ID-4) - Body ground B - Body ground Parking brake switch input Parking brake switch ON Below 1 V
PKB (ID-4) - Body ground B - Body ground Parking brake switch input Parking brake switch OFF 10 to 14 V