Toyota Camry 2007-2009 Service Manual - Brake_Control

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM

ANTI-LOCK BRAKE SYSTEM

PRECAUTION

1. EXPRESSIONS OF IGNITION SWITCH

The type of ignition switch used on this model differs according to the specifications of the vehicle. The expressions listed in the table below are used in this section.

BC–1

Expression

Ignition switch off LOCK off

Ignition switch on (IG) ON on (IG)

Ignition switch on (ACC) ACC on (ACC)

Engine start START start

Ignition Switch (Position) Engine Switch (Condition)

Switch Type

2. TROUBLESHOOTING PRECAUTION

HINT: The anti-lock brake system includes the ABS and EBD. (a) When there is a malfunction in the terminal contact

points or installation problems with parts, removing and installing the suspected problem parts may return the system to normal, either completely or temporarily.

(b) In order to determine the malfunctioning area, be

sure to check the conditions at the time the malfunction occurred, such as by the DTC output and the freeze frame data output, and record it before disconnecting each connector or removing and installing parts.

and each individual sensor with the ignition switch off unless otherwise specified in the inspection procedure.

(d) If the brake actuator or a sensor has been removed

and installed, it is necessary to check the system for problems after the parts have been reassembled. Check for DTCs using the intelligent tester, also check that system functions and signals received by the ECU are normal using test mode.

3. CAN COMMUNICATION SYSTEM PRECAUTION

(a) The CAN communication system is used for data

communication between each of the ECUs and sensors. If there is trouble in the CAN communication line, a DTC of the communication line is output.

(b) If a DTC of the CAN communication line is output,

repair the malfunction in the communication line and troubleshoot the anti-lock brake system.

BC–2

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM

type of wiring is used for the CAN communication lines. The wiring used for each communication line is a twisted pair of wires that have an equal length. A bypass wire should not be used, because the data being transmitted will be corrupted.

PARTS LOCATION

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM

BRAKE MASTER CYLINDER ASSEMBLY

- BRAKE FLUID LEVEL WARNING SWITCH

BC–3

BRAKE ACTUATOR

- SKID CONTROL ECU

FRONT SPEED SENSOR ROTOR

FRONT SPEED SENSOR

SKID CONTROL SENSOR

(REAR SPEED SENSOR)

REAR SPEED SENSOR ROTOR

ECM (2GR-FE)

ECM

(2AZ-FE)

FRONT SPEED SENSOR

FRONT SPEED SENSOR ROTOR

ENGINE ROOM R/B

SKID CONTROL SENSOR

- FUSIBLE LINK (ABS NO. 1) (REAR SPEED SENSOR)

- FUSIBLE LINK (ABS NO. 2)

REAR SPEED SENSOR ROTOR

C131985E01

BC–4

PARKING BRAKE SWITCH

(AUTOMATIC TRANSAXLE)

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM

STOP LIGHT SWITCH

COMBINATION METER ASSEMBLY

- ABS WARNING LIGHT

- BRAKE WARNING LIGHT

INSTRUMENT PANEL J/B

- ECU IG NO. 2 FUSE

DLC3

PARKING BRAKE SWITCH

(MANUAL TRANSAXLE)

C131984E01

Speed Sensor

(On Each Wheel)

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM

SYSTEM DIAGRAM

Brake Actuator Assembly (Skid Control ECU with Actuator)

Motor Relay Motor

BC–5

SolenoidSolenoid Relay

Stop Light Switch

Parking Brake Switch

Skid Control ECU

Combination Meter Assembly

Speedometer

ABS Warning Light

BRAKE Warning Light

Main Body ECU

CAN Communication System

Transmitting ECU Receiving ECU Signals Communication method

Skid control ECU Combination meter

ECM

• ABS warning light signal

• BRAKE warning light signal

C131987E01

CAN communication system

BC–6

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM

Transmitting ECU Receiving ECU Signals Communication method

ECM Skid control ECU Shift position signal CAN communication system

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM

SYSTEM DESCRIPTION

1. SYSTEM DESCRIPTION

HINT: The skid control ECU is located within the brake actuator assembly. (a) ABS

(Anti-lock Brake System) The ABS helps prevent the wheels from locking when the brakes are applied firmly or when braking on a slippery surface.

Brake Actuator Assembly

BC–7

Each Speed Sensor

Skid Control ECU

ABS Warning Light

Pump Motor

Solenoid Valves

Each Wheel Cylinder

Combination Meter Assembly

CAN Communication System

Hydraulic Pressure

C132003E01

BC–8

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM

Operation description The skid control ECU detects wheel lock based on speed signals it receives from the wheel speed sensors. Based on this information, the skid control ECU controls the pump motor and solenoid valves. The pump motor and solenoid valves are used to prevent wheel lock by controlling the hydraulic pressure applied to the brakes at each wheel. The ABS warning light will come on when the system is malfunctioning.

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM

(b) EBD

(Electronic Brake force Distribution) The EBD control utilizes ABS, realizing proper brake force distribution between the front and rear wheels in accordance with driving conditions. In addition, when braking while cornering, it also controls the brake forces of the right and left wheels, helping to maintain vehicle behavior.

Brake Actuator Assembly

Pump Motor

BC–9

Each Speed Sensor

Skid Control ECU

BRAKE Warning Light

Combination Meter Assembly

ABS Warning Light

Solenoid Valves

Each Wheel

CAN Communication System

Hydraulic Pressure

C132004E01

BC–10

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM

Operation description The skid control ECU receives a speed signal from each wheel speed sensor , and uses these signals to detect locking of the wheels. The ECU uses this information in order to determine appropriate control of the solenoid valves. The solenoid valves control the hydraulic pressure applied to the brake cylinder at each wheel. In this way, the solenoid valves are used to control the brake power split between the front and rear, and left and right wheels. The ABS and BRAKE warning lights come on if there is a malfunction in the EBD system.

2. ABS with EBD OPERATION

(a) Based on the signals received from the 4 wheel

speed sensors, the skid control ECU calculates the deceleration and speed of each wheel, while monitoring for wheel lock. If wheel lock is occurring, the ECU controls the solenoid valves in the brake actuator in order to adjust the hydraulic pressure applied to the brakes at each wheel.

3. FAIL SAFE FUNCTION

(a) When a failure occurs in the anti-lock brake system,

the ABS warning light comes on and operation is prohibited. In addition, when a failure which disables EBD operation occurs, the brake warning light also comes on and operation is prohibited (See page

BC-24).

4. INITIAL CHECK

(a) When the vehicle speed first becomes

approximately 4 mph (6 km/h) or more after the ignition switch is turned on (IG), each solenoid valve and motor of the brake actuator is sequentially activated to perform an electrical check. During the initial check, the operating sound of solenoid valve and motor can be heard from the engine compartment, but this is not a malfunction.

5. FUNCTION OF COMPONENTS

Components Function

• Composed of the holding solenoid valve, pressure reduction

Brake actuator assembly

Skid control ECU Processes the signals sent from each sensor to control ABS and EBD. Speed sensor Master cylinder Generates pressure according to pedal effort. Stop light switch

Solenoid relay

Motor relay

ABS warning light

solenoid valve, pump motor, reservoir, etc., and adjusts the hydraulic pressure applied to each wheel cylinder.

• Houses the skid control ECU.

Detects speed of each wheel and inputs the data into the skid control ECU.

Illuminates the stop light when the brake pedal is depressed. (Sends a brake on signal to the skid control ECU)

• Supplies power to each solenoid.

• Housed in the skid control ECU.

• Supplies power to the pump motor.

• Housed in the skid control ECU.

• Comes on to inform the driver that a malfunction in the ABS and EBD has occurred.

• Blinks to output DTC.

BRAKE warning light

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM

Components Function

• Comes on to inform the driver that the parking brake is on when the system is normal or the brake fluid level has decreased.

• Comes on to inform the driver that a malfunction in the EBD has occurred.

BC–11

BC–12

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM

HOW TO PROCEED WITH TROUBLESHOOTING

VEHICLE BROUGHT TO WORKSHOP

CUSTOMER PROBLEM ANALYSIS

(a) Interview the customer to confirm the trouble.

CHECK CAN COMMUNICATION SYSTEM

(a) Check for DTCs (See page BC-21).

HINT: The skid control ECU is connected to the CAN communication system. Therefore, before starting troubleshooting, make sure to check that there is no trouble in the CAN communication system.

Result

Result Proceed to

DTC is not output A

DTC is output B

CHECK DTC AND FREEZE FRAME DATA

(a) Check for DTCs and Freeze Frame Data (See page BC-

21 for DTC Check / Clear, BC-23 for Freeze Frame

Data).

(1) Record the DTCs and Freeze Frame Data. (b) Clear the DTCs. (c) Recheck for DTCs.

(1) Reproduce the malfunction and check if the DTCs

Result

Result Proceed to

DTC is output A

DTC is not output (Problem symptom does not occur) B

DTC is not output (Problem symptom occurs) C

CHECK CAN COMMUNICATION CIRCUIT

are output again.

GO TO STEP 9

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM

BC–13

DIAGNOSTIC TROUBLE CODE CHART

(a) Go to "DIAGNOSTIC TROUBLE CODE CHART" (See

page BC-27).

CIRCUIT INSPECTION

REPAIR OR REPLACE

GO TO STEP 10

END

CONFIRMATION TEST

SYMPTOM SIMULATION

PROBLEM SYMPTOMS TABLE

(a) Go to "PROBLEM SYMPTOMS TABLE" (See page BC-

16).

CIRCUIT INSPECTION

BC–14

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM

REPAIR OR REPLACE

CONFIRMATION TEST

END

ABS Warning Light:

USA:

Canada: Canada:

USA:

BRAKE Warning Light:

C131966E01

TEST MODE PROCEDURE

1. WARNING LIGHT AND INDICATOR LIGHT INITIAL

CHECK

(a) Release the parking brake.

NOTICE: Before releasing the parking brake, move the shift lever to the P position for safety (AT model) or set the chocks to hold the vehicle for safety (MT model).

HINT: When the parking brake is applied or the level of the brake fluid is low, the BRAKE warning light comes on.

(b) When the ignition switch is turned on (IG), check

that the ABS warning light comes on for approximately 3 seconds. HINT:

• If the skid control ECU stores any DTCs, the ABS and BRAKE warning lights come on.

• If the indicator remains on or does not come on, proceed to troubleshooting for the light circuits listed below.

Trouble Area See procedure

ABS warning light (Remains on) BC-74 ABS warning light circuit (Does not come on) BC-78 BRAKE warning light (Remains on) BC-81 BRAKE warning light (Does not come on) BC-91

2. SENSOR SIGNAL CHECK USING TEST MODE (SIGNAL CHECK) (INTELLIGENT TESTER)

HINT: If the ignition switch is turned from on (IG) to on (ACC) or off during Test Mode (signal check), DTCs recorded during the signal check function will be erased.

DLC3

Intelligent Tester

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM

(a) Procedure to enter Test Mode.

(1) Turn the ignition switch off. (2) Connect the intelligent tester to the DLC3. (3) Check that the steering wheel is centered and

move the shift lever to the P position (for Automatic Transaxle) o r apply the p arking brake (Manual Transaxle).

(4) Turn the ignition switch on (IG).

C131977E02

(5) Set the intelligent tester to Test Mode (select

"SIGNAL CHECK"). HINT: Refer to the intelligent tester operator's manual for further details.

BC–15

TEST MODE:

Blinking Pattern:

0.13 sec.

OFF

Display:

0.13 sec.

USA:

Canada:

C106533

(6) Check that the ABS warning light comes on for

several seconds and then blinks in test mode. HINT: If the ABS warning light does not blink, inspect the ABS warning light circuit.

Trouble Area See procedure

ABS warning light (Does not come on) BC-78

(b) Check the sensor signal.

(1) Drive the vehicle straight ahead.

Accelerate the vehicle to a speed of 28 mph (45 km/h) or more for several seconds and check that the ABS warning light goes off when the brake pedal is depressed. HINT:

• The sensor check may not be completed if wheel spin occurs, or if the steering wheel is turned during this check.

• The ABS warning light goes off when the sensor signal check has been completed and the brake pedal is depressed.

• The ABS warning light comes on immediately after a malfunction has been detected during the speed sensor signal check.

C132874E01

BC–16

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM

NOTICE:

• The speed sensor check may not be completed if the speed sensor check is started while turning the steering wheel or spinning the wheels.

• If the signal check has not been completed, the ABS warning light will blink while driving and the ABS system will not operate.

(d) Read the DTC(s) by following the tester screen.

NOTICE:

• If only the DTCs are displayed, repair the malfunction area and clear the DTCs.

• If the DTCs or Test Mode codes (DTC of signal check function) are displayed, repair the malfunction area, clear the DTCs and perform the Test Mode inspection.

HINT: See the list of DTCs (See procedure "A").

3. SENSOR SIGNAL CHECK BY TEST MODE (SIGNAL CHECK) (SST CHECK WIRE)

HINT: If the ignition switch is turned from on (IG) to on (ACC) or off during Test Mode (signal check), DTCs recorded during the signal check will be erased. (a) Procedure for Test Mode.

(1) Turn the ignition switch off. (2) Check that the steering wheel is centered and

move the shift lever to the P position (Automatic Transaxle) or apply the parking brake (Manual Transaxle).

DLC3:

(3) Using SST, connect terminals TS and CG of the

DLC3.

SST 09843-18040

(4) Turn the ignition switch on (IG).

G022987E07

TEST MODE:

Blinking Pattern:

0.13 sec.

OFF

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM

(5) Check that the ABS warning light comes on for

several seconds and then blinks in Test Mode. HINT: If the ABS warning light does not blink, inspect the TS and CG terminal circuit, and ABS

0.13 sec.

TS and CG terminal circuit BC-97 ABS warning light circuit (Does not come on) BC-78

warning light circuit.

Trouble Area See procedure

BC–17

Display:

USA:

Canada:

C132874E01

(b) Check the sensor signal.

(1) Drive the vehicle straight ahead.

Accelerate the vehicle to a speed of 28 mph (45 km/h) or more for several seconds and check that the ABS warning light goes off when the brake pedal is depressed. HINT:

• The sensor check may not be completed if wheel spin occurs, or if the steering wheel is turned during this check.

• The ABS warning light goes off when the sensor signal check has been completed and the brake pedal is depressed.

• The ABS warning light comes on immediately after a malfunction has been detected during the speed sensor signal check.

NOTICE:

• The speed sensor check may not be completed if the speed sensor check is started while turning the steering wheel or spinning the wheels.

• If the signal check has not been completed, the ABS warning light will blink while driving and the ABS system will not operate.

DLC3:

TS TC

(d) Using SST, connect terminals TC and CG of the

DLC3.

SST 09843-18040

G022988E01

BC–18

Blinking Pattern of Normal System Code:

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM

(e) Count the number of blinks of the ABS warning light.

0.25 sec.

OFF

Blinking Pattern of Trouble Code (Example Codes 71 and 72):

0.5 sec.

OFF

Code 71 Code 72

0.25 sec.

1.5 sec.

2.5 sec. 4 sec.

Repeat

C132876E01

NOTICE:

• If only the DTCs are displayed, repair the malfunction area and clear the DTCs.

• If the DTCs or Test Mode codes (DTC of signal check function) are displayed, repair the malfunction 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 (See procedure "A").

(f) After performing the check, disconnect the SST

from terminals TS and CG, and TC and CG of the DLC3, and turn the ignition switch off.

(g) Turn the ignition switch on (IG) to cancel the test

mode. HINT:

• If the ignition switch is not turned on (IG) after the SST is removed from the DLC3, the previous Test Mode will continue.

• If the ignition switch is turned on (IG) with terminals TS and CG shorted, the previous Test Mode will continue.

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM

DTC of Test Mode (Signal Check):

Code No. Diagnosis Trouble Area

C1271/71 Low output signal of front speed sensor RH

C1272/72 Low output signal of front speed sensor LH

C1273/73 Low output signal of rear speed sensor RH

C1274/74 Low output signal of rear speed sensor LH

C1275/75

C1276/76

C1277/77

C1278/78

Abnormal change in output signal of front speed sensor RH

Abnormal change in output signal of front speed sensor LH

Abnormal change in output signal of rear speed sensor RH

Abnormal change in output signal of rear speed sensor LH

BC–19

4. DTC OF TEST MODE (SIGNAL CHECK) FUNCTION (Procedure "A")

• Front speed sensor RH

• Sensor installation

• Speed sensor rotor

• Front speed sensor LH

• Sensor installation

• Speed sensor rotor

• Rear speed sensor RH

• Sensor installation

• Speed sensor rotor

• Rear speed sensor LH

• Sensor installation

• Speed sensor rotor

• Front speed sensor RH

• Front speed sensor circuit RH

• Sensor installation

• Front speed sensor LH

• Front speed sensor circuit LH

• Sensor installation

• Rear speed sensor RH

• Rear speed sensor circuit RH

• Sensor installation

• Rear speed sensor LH

• Rear speed sensor circuit LH

• Sensor installation

HINT: The codes in this table are output only in Test Mode (signal check).

BC–20

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM

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.

NOTICE: When replacing the skid control ECU, sensor, etc., turn the ignition switch off.

HINT:

• Inspect the fuses and relays before investigating the suspected areas as shown in the table below.

• Inspect each malfunction circuit in numerical order for the corresponding symptoms.

ANTI-LOCK BRAKE SYSTEM:

Symptom Suspected area See page

1. Check the DTC reconfirming that the normal system code is output

2. IG power source circuit BC-63

3. Front speed sensor circuit BC-30

4. Rear speed sensor circuit BC-38

ABS does not operate

ABS does not operate efficiently

ABS warning light malfunction (Remains on)

ABS warning light malfunction (Does not come on) 1. ABS warning light circuit BC-78

Brake warning light malfunction (Remains on)

Brake warning light malfunction (Does not come on)

ABS sensor DTC check cannot be done

5. Check the brake actuator assembly with the intelligent tester (Check brake actuator assembly operation using the active test function) If abnormal, check the hydraulic circuit for leakage

6. If the symptoms still occur even after the above circuits in suspected areas have been inspected and proved to be normal, replace the brake actuator assembly (skid control ECU)

1. Check the DTC reconfirming that the normal system code is output.

2. Front speed sensor circuit BC-30

3. Rear speed sensor circuit BC-38

4. Stop light switch circuit BC-67

5. Check the brake actuator assembly with the intelligent tester (Check brake actuator assembly operation using the active test function)

6. If the symptoms still occur even after the above circuits in suspected areas have been inspected and proved to be normal, replace the brake actuator assembly (skid control ECU)

1. ABS warning light circuit BC-74

2. Brake actuator assembly (skid control ECU) BC-432

1. Brake warning light circuit BC-81

2. Brake actuator assembly (skid control ECU) BC-432

1. Brake warning light circuit BC-91

2. Brake actuator assembly (skid control ECU) BC-432

1. Check the DTC again and make sure that the normal system code is output

2. TS and CG terminal circuit BC-97

3. TC and CG terminal circuit BC-94

4. If the symptoms still occur even after the above circuits in suspected areas have been inspected and proved to be normal, replace the brake actuator assembly (skid control ECU)

BC-21

BR-42

BC-432

BC-21

BR-42

BC-432

BC-21

BC-432

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM

TERMINALS OF ECU

1. TERMINALS OF ECU

Skid Control ECU (Brake Actuator Assembly):

Symbols (Terminal No.) Terminal Description

GND2 (1) Actuator pump motor ground

+BM (2) Motor relay power supply +BS (3) Solenoid valves power supply

GND1 (4) Skid control ground

FL+ (5) Front LH (+) wheel speed signal input

FL- (6) Front LH (-) wheel speed signal input RL+ (7) Rear LH (+) wheel speed signal input RR- (8) Rear RH (-) wheel speed signal input FR- (9) Front RH (-) wheel speed signal input

FR+ (10) Front RH (+) wheel speed signal input

D/G (11) Diagnosis tester communication line

CANL (15) CAN communication line L

RL- (17) Rear LH (-) wheel speed signal input

IG1 (18) ECU power supply RR+ (19) Rear RH (+) wheel speed signal input STP (20) Stop light switch input SP1 (23) Speed signal output for speedometer

TS (25) Sensor check input

CANH (26) CAN communication line H

BC–21

C131974E01

2. TERMINAL INSPECTION

(a) Disconnect the connector and measure the voltage

or resistance on the wire harness side. HINT: Voltage cannot be measured with the connector connected to the skid control ECU as the connector is watertight.

BC–22

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM

Skid Control ECU (Harness Side Connector Front View):

Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition

GND2 (1) - Body ground W-B - Body ground +BM (2) - Body ground B - Body ground Motor relay power supply Always 10 to 14 V +BS (3) - Body ground L - Body ground GND1 (4) - Body ground W-B - Body ground Skid control ECU ground Always Below 1 Ω

IG1 (18) - Body ground P - Body ground ECU power supply Ignition switch on (IG) 10 to 14 V STP (20) - Body ground P - Body ground Stop light switch input

STP (20) - Body ground P - Body ground Stop light switch input

Actuator pump motor ground

Solenoid valves power supply

Always Below 1 Ω

Always 10 to 14 V

Stop light switch ON (Brake pedal depressed)

Stop light switch OFF (Brake pedal released)

8 to 14 V

Below 3 V

C131969E01

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM

DIAGNOSIS SYSTEM

1. DIAGNOSIS SYSTEM

(a) Inspect the battery voltage.

Standard voltage:

11 to 14 V

If the voltage is below 11 V, recharge the battery before proceeding.

(b) The vehicle's ECU uses the ISO 15765-4 for

communication protocol. The terminal arrangement

12345678

9 10 111213141516

Symbols (Terminal No.) Terminal Description Condition Specified Condition

CG (4) - Body ground Chassis ground Always Below 1 Ω SG (5) - Body ground Signal ground Always Below 1 Ω BAT (16) - Body ground Battery positive Always 9 to 14 V CANH (6) - CANL (14) HIGH-level CAN bus line Ignition switch OFF* 54 to 69 Ω CANH (6) - Battery positive HIGH-level CAN bus line Ignition switch OFF* 6 kΩ or higher CANH (6) - CG (4) HIGH-level CAN bus line Ignition switch OFF* 200 Ω or higher CANL (14) - Battery positive LOW-level CAN bus line Ignition switch OFF* 6 kΩ or higher CANL (14) - CG (4) LOW-level CAN bus line Ignition switch OFF* 200 Ω or higher

CANL

CANH

BAT

A082779E65

of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format. HINT: Connect the cable of the intelligent tester to the DLC3, turn the ignition switch on (IG) and attempt to use the intelligent tester. If the screen displays a communication error message, a problem exists on either the vehicle side or the tester side. If the communication is normal when the tester is connected to another vehicle, inspect the DLC3 on the original vehicle. If the communication is still impossible when the tester is connected to another vehicle, the problem is probably in the tester itself. Consult the Service Department listed in the tester's instruction manual.

BC–23

NOTICE: *: Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors.

2. DIAGNOSIS NOTICE: When releasing the parking brake, set chocks to hold the vehicle for safety.

BC–24

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM

(a) Release the parking brake. (b) Turn the ignition switch on (IG). (c) If the skid control ECU detects a malfunction, the

ABS warning light and brake warning light will come on to warn the driver. The table below indicates which light will come on when there is a malfunction in a particular function.

USA: USA:

Canada: Canada:

C131968E01

Item/Trouble Area ABS System EBD System Skid Control ECU

ABS Warning light {{{

Brake Warning light - {{

{: Light ON

-: Light OFF

• The DTCs are simultaneously stored in the memory. The DTCs can be read by connecting the SST (09843-18043) between the TC and CG terminals of the DLC3 and observing the blinking pattern of the ABS warning light, or by connecting an intelligent tester (See page BC-

21).

• This system has a sensor signal check function (See page BC-11).

3. WARNING LIGHT INITIAL CHECK NOTICE: When releasing the parking brake, set chocks to hold the vehicle for safety.

HINT: When the parking brake is applied or the level of the brake fluid is low, the brake warning light comes on.

USA:

Canada: Canada:

USA:

(a) Release the parking brake. (b) Check that the ABS warning light and brake warning

light come on when the ignition switch is turned on (IG) and go off in approximately 3 seconds.

inspect the ABS warning light circuit and/or brake warning light circuit.

Trouble Area See procedure

ABS warning light circuit (Remains on) BC-74 ABS warning light circuit (Does not come on) BC-78 Brake warning light circuit (Remains on) BC-81 Brake warning light circuit (Does not come on) BC-91

C131968E01

Vibrate Slightly

Shake Slightly

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM

4. SYMPTOM SIMULATION

HINT: The most difficult case in troubleshooting is when no symptoms occur. In such cases, a thorough customer problem analysis must be carried out. Then the same or similar conditions and environment in which the problem occurred in the customer's vehicle should be reproduced. No matter how experienced or skilled a technician may be, if he proceeds to troubleshoot without confirming the problem symptoms, he will likely overlook something important and make a wrong guess at some points in the repair operation. This leads to a standstill in troubleshooting.

(a) Vibration method: When vibration seems to be the

major cause. HINT: Perform the simulation method only during the primary check period (for approximately 6 seconds after the ignition switch is turned on (IG)). (1) Slightly vibrate the part of the sensor considered

to be the problem cause with your fingers and check whether the malfunction occurs.

(2) Slightly shake the connector vertically and

horizontally. HINT: Shaking the relays too strongly may result in open relays.

(3) Slightly shake the wire harness vertically and

horizontally. The connector joint and fulcrum of the vibration are the major areas to be checked thoroughly.

BC–25

DLC3:

Vibrate Slightly

D025083E13

G022986E01

DTC CHECK / CLEAR

1. DTC CHECK / CLEAR (SST CHECK WIRE)

(a) DTC check

(1) Using SST, connect terminals TC and CG of the

DLC3.

SST 09843-18040

(2) Turn the ignition switch on (IG). (3) Read the DTCs from the ABS warning light on

the combination meter. HINT: If no code appears, inspect the TC and CG terminal circuit and the ABS warning light circuit.

Trouble Area See procedure

TC and CG terminal circuit BC-94 ABS warning light circuit (Remains on) BC-74 ABS warning light circuit (Does not come on) BC-78

BC–26

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM

(4) As an example, refer to the chart below for the

blinking patterns of the normal system code and trouble codes 11 and 21.

Normal System Code: Trouble Code (Example Codes 11 and 21):

DLC3:

OFF

2 sec.

0.25 sec.

OFF

0.5 sec.

2.5 sec.

1.5 sec.

4 sec.

Code 11 Code 21

0.5 sec.

4 sec.

Repeat

(5) The codes are explained in the code table (See

page BC-27).

(6) After completing the check, disconnect terminals

TC and CG of the DLC3, and turn off the display . If 2 or more DTCs are detected at the same time, the DTCs will be displayed in ascending order.

(b) DTC clear

(1) Using SST, connect terminals TC and CG of the

DLC3.

SST 09843-18040

(2) Turn the ignition switch on (IG).

I042843E01

G022986E01

BR03890

(3) Clear the DTCs stored in the ECU by depressing

the brake pedal 8 times or more within 5 seconds.

(4) Check that the warning light indicates the normal

system code.

(5) Remove the SST from the terminals of the

DLC3. HINT: Clearing the DTCs cannot be performed by disconnecting the battery terminal or the ECU-IG fuse.

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM

BC–27

Intelligent Tester

DLC3

CAN VIM

C131977E05

2. DTC CHECK/CLEAR (WHEN USING INTELLIGENT TESTER:)

(a) DTC check

(1) Connect the intelligent tester to the DLC3. (2) Turn the ignition switch on (IG). (3) Read the DTCs by following the prompts on the

tester screen.

(b) DTC clear

(1) Connect the intelligent tester to the DLC3. (2) Turn the ignition switch on (IG). (3) Operate the intelligent tester to clear the codes.

HINT: Refer to the intelligent tester operator's manual for further details.

3. END OF DTC CHECK/CLEAR

(a) Turn the ignition switch on (IG). (b) Check that the ABS warning light goes off within

approximately 3 seconds.

BC–28

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM

FREEZE FRAME DATA

1. FREEZE FRAME DATA

(a) Whenever a DTC is detected or the ABS operates,

the skid control ECU stores the current vehicle (sensor) status as Freeze Frame Data.

(b) The skid control ECU stores the number of times

(maximum: 31) the ignition switch has been turned from off to on (IG) since the last time the ABS was activated. HINT:

• Freeze frame data at the time the ABS operates: The skid control ECU stores and updates data whenever the ABS system operates. When the skid control ECU stores data at the time a DTC is detected, the data stored during ABS operation is erased.

• Freeze frame data at the time a DTC is detected: When the skid control ECU stores data at the time a DTC is detected, no updates will be performed until the data is cleared.

Intelligent Tester

(d) Turn the ignition switch on (IG). (e) Select "DTC INFO" on the tester display. (f) On the DTC data display screen, select the DTC

data display with "*".

DLC3

CAN VIM

C131977E05

Intelligent Tester Display Measurement Item Reference Value

TROUBLE CODE Freeze DTC min.: 0, max.: 65535 #DTC Number of trouble codes min.: 0, max.: 255 FREEZE TIME Elapsed time after freeze trigger Min.: 0 ms, Max.: 500 ms

#IG ON STOP LAMP SW Stop light switch signal Stop light switch ON: ON, OFF: OFF PARKING BRAKE SW Parking brake condition OPERATED SYSTEM Operated system ABS operated: ABS FR WHEEL SPD Front right wheel speed

FL WHEEL SPD Front left wheel speed

RR WHEEL SPD Rear right wheel speed

Number of operations of ignition switch on (IG) after storing freeze frame data

0 to 31

ON: Parking brake on OFF: Parking brake off

Min.: 0 MPH (0 km/h), Max.: 202 MPH (326 km/h)

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM

Intelligent Tester Display Measurement Item Reference Value

RL WHEEL SPD Rear left wheel speed VEHICLE SPD Vehicle speed reading Speed indication on the meter

SPD GRADE Vehicle speed grade Min.: -1.869 G, Max.: 1.869 G

Min.: 0 MPH (0 km/h), Max.: 202 MPH (326 km/h)

BC–29

BC–30

BRAKE CONTROL – ANTI-LOCK BRAKE SYSTEM

FAIL-SAFE CHART

1. FAIL SAFE OPERATION

If there is a problem with sensor signals or brake actuator systems, the skid control ECU will prohibit power supply to the brake actuator and terminate ABS control. ABS control will be prohibited, but EBD control continues as much as possible. If EBD control is impossible, the brake warning light will come on to warn the driver (See page BC-19).

Malfunction Area Control Method

ABS system Prohibits the ABS control EBD system Prohibits the ABS and EBD control

HINT: If the ABS system has a malfunction, the brake system will operate normally without ABS control.

+ 442 hidden pages

Toyota Camry 2007-2009 Service Manual - Brake_Control

Specifications and Main Features

Frequently Asked Questions

User Manual