Repair U0100 Camry

This function is used to detect all ECUs and Sensors which are connected to the Communication Bus.

Press [ENTER]

C113761

BUS CHECK

"Name of ECU 1 Name of ECU 2 Name of ECU 3 Name of ECU 4 "Name of ECU 5

Press [EXIT]

(c) The screen displays the ECUs and sensors that are properly connected to the CAN communication system. HINT:

Properly connected ECUs or sensors that are not displayed on the screen indicate that a communication stop is occuring in the system, sensor, or ECU which is not displayed.

2. CHECK FOR INSTALLED SYSTEMS (ECUS AND SENSORS) THAT USE CAN COMMUNICATION (a) Systems (ECUs, sensors) that use CAN

communication vary depending on the vehicle's optional equipment. Check which systems (ECUs, sensors) are installed on the vehicle.

ECU/Sensor name

Check method

ABS/VSC/TRC

Installed on all vehicles

STEERING SENSOR

With VSC system

YAW / DECELERAT

With VSC system

ENGINE

Installed on all vehicles

ECU/Sensor name

Check method

ECT

With automatic transaxle

SRS AIRBAG

Installed on all vehicles

A/C

Installed on all vehicles

METER

Installed on all vehicles

MAIN BODY

Installed on all vehicles

ACCESSORY G/W

With dealer option

SMART ACCESS/KEY

With smart key system

3. DTC TABLE BY ECU

HINT:

• For the CAN communication system, CAN communication system DTCs stored in certain ECUs can be displayed using the intelligent tester.

• If CAN communication system DTCs are output, trouble cannot be determined only by the DTCs. Perform troubleshooting according to "HOW TO PROCEED WITH TROUBLESHOOTING" (See page CA-8).

DTC No.

Detection Item

U0101*

High speed CAN Communication Bus

HINT:

• DTC communication is via the CAN communication system.

• *: The ECM is malfunctioning if only U0101 is output. Replace the ECM.

DTC No.

Detection Item

U0101*

High speed CAN Communication Bus

HINT:

• DTC communication is via the CAN communication system.

• *: The ECM is malfunctioning if only U0101 is output. Refer to SFI system (See page ES-389).

DTC No.

Detection Item

U0100*

High speed CAN Communication Bus

HINT:

• DTC communication is via the CAN communication system.

• *: The ECM is malfunctioning if only U0100 is output. Replace the ECM.

DTC No.

Detection Item

U0100*

High speed CAN Communication Bus

HINT:

• DTC communication is via the CAN communication system.

• *: The ECM is malfunctioning if only U0100 is output. Refer to Automatic Transaxle system (See page AX-151). (e) SKID CONTROL ECU (with VSC)

DTC No.

Detection Item

U0073

Control Module Communication Bus Off

U0100

Lost Communication With ECM/PCM "A"

U0123

Lost Communication With Yaw Rate Sensor Module

U0124*

Lost Communication With Lateral Acceleration Sensor Module

U0126

Lost Communication With Steering Angle Sensor Module

HINT:

• DTC communication is via the CAN communication system.

(f) SKI D CONTROL ECU (without VSC)

DTC No.

Detection Item

U0073

Control Module Communication Bus Off

HINT:

DTC communication is via the CAN communication system.

(g) COMBINATION METER ECU

DTC No.

Detection Item

U0100

Lost Communication With ECM/PCM "A"

U0129

Lost Communication with Brake System Control Mode

HINT:

DTC communication is via the CAN communication system.

(h) AIR CONDITIONER AMPLIFIER

DTC No.

Detection Item

B1499

Multiplex Communication Circuit

HINT:

DTC communication is via the CAN communication system.

(i) MAIN BODY ECU (with smart key system)

DTC No.

Detection Item

B1207*

Certification ECU Communication Malfunction

B2326*

CAN MS Bus Line Communication Malfunction

HINT:

• DTC communication is via the CAN communication system.

• *: The main body ECU is malfunctioning if B1207 and/or B2326 are output alone. Refer to DTC chart (See page AX-46).

(j) MAIN BODY ECU (without smart key system) HINT:

Although the center airbag sensor is connected to the CAN communication system, CAN communication DTCs are not output.

(k) CENTER AIRBAG SENSOR HINT:

Although the center airbag sensor is connected to the CAN communication system, CAN communication DTCs are not output. (l) CERTIFICATION ECU HINT:

Although the Main Body ECU is connected to the CAN communication system, CAN communication DTCs are not output. 4. DTC COMBINATION TABLE (a) with VSC SYSTEM

DTC

Trouble Mode

Output from

Output DTC

ECM Communication Stop Mode

Skid Control ECU Communication Stop Mode

Steering Angle Sensor Communication Stop Mode

Yaw Rate Sensor Communication Stop Mode

Skid Control ECU

U0073

X

X

X

X

U0100

A During driving

A During driving

X

X

U0123

X

O

X

O

U0124*

X

O

X

O

U0126

X

O

O

X

Combination Meter ECU

U0100

O

X

X

X

U0129

X

O

X

X

Air Conditioner Amplifier ECU

B1499

X

X

X

X

No DTC

X

X

X

X

• X: Not set or may be set according to the malfunctioning part when one side of the CAN bus wire opens

• a: Set under the condition shown in the table above

DTC

Trouble Mode

Output from

Output DTC

Air Conditioner Amplifier ECU Communication Stop Mode

Center Airbag Sensor Communication Stop Mode

Main Body ECU Communication Stop Mode

Combination Meter ECU Communication Stop Mode

Skid Control ECU

U0073

X

X

X

X

U0100

X

X

X

X

U0123

X

X

X

X

U0124*

X

X

X

X

U0126

X

X

X

X

Combination Meter ECU

U0100

X

X

X

X

U0129

X

X

X

X

Air Conditioner Amplifier ECU

B1499

X

X

A

A

No DTC

O

o

X

X

• X: Not set or may be set according to the malfunctioning part when one side of the CAN bus wire opens

• a: Set under the condition shown in the table above

(b) without VSC SYSTEM

DTC

Trouble Mode

Output from

Output DTC

ECM Communicatio n Stop Mode

Skid Control

ECU Communicatio n Stop Mode

Combination Meter ECU Communicatio n Stop Mode

Air Conditioner Amplifier ECU Communicatio n Stop Mode

Center Airbag

Sensor Communicatio n Stop Mode

Main Body ECU Communicatio n Stop Mode

Skid Control ECU

U0073

X

X

X

X

X

X

Combination Meter ECU

U0100

O

X

X

X

X

X

U0129

X

o

X

X

X

X

Conditioner Amplifier ECU

B1499

X

X

A

X

X

A

No DTC

X

X

X

O

O

• X: Not set or may be set according to the malfunctioning part when one side of the CAN bus wire becomes open.

(c) Perform troubleshooting depending on the combination of DTCs output.

HINT:

• ECM Communication Stop Mode (See Page CA-54)

• Skid Control ECU Communication Stop Mode (See page CA-42)

• Steering Angle Sensor Communication Stop Mode (See page CA-49)

• Yaw Rate Sensor Communication Stop Mode (See page CA-51)

• Combination Meter ECU Communication Stop Mode (See page CA-61)

• Center Airbag Sensor Communication Stop Mode (See page CA-63)

• Air Conditioner Amplifier ECU Communication Stop Mode (See page CA-46)

• Main Body ECU Communication Stop Mode (See page CA-57)

FAIL-SAFE CHART

1. FAIL-SAFE FUNCTION

(a) When communication fails in any of the CAN bus wire (communication lines) due to a short circuit or other causes, a fail-safe functions, will operate. The fail-safe function that is specified for each system operates to prevent those systems from malfunctioning.

(b) The following chart shows the relationships between components and system functions and effects of communication failure on these functions. (For further details, see the pages for each system.)

Function

ECU (With VSC)

Steering Sensor

Yaw Rate Sensor

Condition when communication impossible

DTC detection (Driver detectable)

VSC control

(Controls driving force while VSC in operation)

O

-

O

O

Control inoperative (gradually stops controlling during VSC control)

Detectable (Light comes on)

TRC control

(Controls driving force and engine power when wheel slip detected during acceleration)

O

-

-

-

Control inoperative (gradually stops controlling during TRC control)

Detectable (Light comes on)

ABS control

(Controls driving force while ABS in operation)

O

-

o ^

Control is inoperative (gradually stops controlling during ABS control)

Detectable (Light comes on)

Theft deterrent system cannot be set

Detectable

Security function

-

-

-

-

-

(Indicator light does not comes on)

Air conditioning control

o

-

-

-

-

Air conditioning function stops

None (Air conditioning inoperative)

Meter Display (Displays operation condition and DTCs)

o

O

O *2

-

-

Light does not come on, illuminates abnormally, or blinks abnormally

Detectable (Abnormal display)

Buzzer function stops

Detectable

Buzzer control

o

o

O *2

-

-

(Buzzer does not sound)

Illumination control

o

-

-

-

-

Light illumination rheostat inoperative

None (Rheostat inoperative)

Smart entry / Power door lock control*3

-

-

-

-

-

Unlock permitted

None (Wireless door lock operation)

HINT:

Function

Center Airbag Sensor Assembly

Conditioning Amplifier

Combination Meter ECU

Main Body ECU

Certification ECU*3

Condition when communication on impossible

DTC detection (Driver detectable)

VSC control

(Controls driving force while VSC in operation)

-

-

-

-

-

Control inoperative (gradually stops controlling during VSC control)

Detectable (Light comes on)

TRC control

(Controls driving force and engine power when wheel slip detected during acceleration)

-

-

-

-

-

Control inoperative (gradually stops controlling during TRC control)

Detectable (Light comes on)

ABS control

(Controls driving force while ABS in operation)

-

-

-

-

-

Control is inoperative (gradually stops controlling during ABS control)

Detectable (Light comes on)

Security function

-

-

-

O

Theft deterrent system cannot beset

Detectable (Indicator light does not comes on)

Air conditioning control

-

O

o

-

Air conditioning function stops

None (Air conditioning inoperative)

Meter Display (Displays operation condition and DTCs)

O

-

o

O

Light does not come on, illuminates abnormally, or blinks abnormally

Detectable (Abnormal display)

Buzzer control

O

-

-

-

Buzzer function stops

Detectable (Buzzer does not sound)

Illumination control

-

-

o

-

Light illumination rheostat inoperative

None (Rheostat inoperative)

Smart entry / Power door lock control*3

-

-

o

o

Unlock permitted

None (Wireless door lock operation)

HINT:

DIAGNOSTIC TROUBLE CODE CHART

CAN COMMUNICATION SYSTEM

DTC No.

Detection Item

Trouble Area

See page

B1207

Certification ECU Communication Malfunction

1. CAN MS bus wire or connector

2.Certification ECU power source circuit

3. Certification ECU

4. Main Body ECU

CA-32

B2326

CAN MS Bus Line Communication Malfunction

1. CAN MS bus wire or connector

2.Certification ECU power source circuit

3. Certification ECU

4. Main Body ECU

CA-32

DTC

B1207

Certification ECU Communication Malfunction

DTC

B2326

CAN MS Bus Line Communication Malfunction

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Responses

  • robert
    How to fix code U0073 on a 2007 Toyota Camry?
    4 years ago
  • Girma Asmara
    What are the causes of U0100 fault code in Toyota corolla?
    2 years ago

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