Toyota Yaris Can Bus Circuit

NOTICE:

For vehicles without ABS, go to step 8.

(a) Measure the resistance. HINT:

The resistance must be measured after the D41 D-CAN J/C connector is disconnected.

Result

Go to step 11

Tester Connection

Condition

Specified Condition

Proceed to

D41-1 (ABS) -D41-12 (ABS)

Ignition switch OFF

Below 1 Q

A

D41-1 (ABS) -D41-12 (ABS)

Ignition switch OFF

1 Q or higher

B

CHECK CAN BUS LINES FOR SHORT CIRCUIT (D-CAN J/C - AIR CONDITIONING AMPLIFIER)

Wire Harness Side:

D-CAN J/C Connector isr "nor

C125896E26

NOTICE:

For vehicles without air conditioning or PTC heater, go to step 9.

(a) Measure the resistance. HINT:

The resistance must be measured after the D41 D-CAN

J/C connector is disconnected.

Result

Tester Connection

Condition

Specified Condition

Proceed to

D41-6 (A/C) - D41-17 (A/C)

Ignition switch OFF

Below 1 Q

A

D41-6 (A/C) - D41-17 (A/C)

Ignition switch OFF

1 Q or higher

Go to step 12

CHECK CAN BUS LINES FOR SHORT CIRCUIT (D-CAN J/C - CENTER AIRBAG SENSOR ASSEMBLY)

Wire Harness Side:

D-CAN J/C Connector

C125896E27

(a) Measure the resistance. HINT:

The resistance must be measured after the D41 D-CAN J/C connector is disconnected.

Result

Tester Connection

Condition

Specified Condition

Proceed to

D41-8 (A/B) - D41-19 (A/B)

Ignition switch OFF

Below 1 Q

A

D41-8 (A/B) - D41-19 (A/B)

Ignition switch OFF

1 Q or higher

Go to step 13

REPLACE D-CAN J/C (JUNCTION CONNECTOR)

CHECK CAN BUS LINES FOR SHORT CIRCUIT (ECM MAIN WIRE)

Wire Harness Side:

ECM Connector

Front View

(a) Disconnect the A21 ECM connector.

C125895E08

Wire Harness Side:

D-CAN J/C Connector nor' "non

(b) Measure the resistance. HINT:

The resistance must be measured after the D41 D-CAN

J/C connector is disconnected.

Result

Tester Connection

Condition

Specified Condition

Proceed to

D41-4 (EFI) - D41-15 (EFI)

Ignition switch OFF

1 Q or higher

OK

D41-4 (EFI) - D41-15 (EFI)

Ignition switch OFF

Below 1 Q

REPLACE ECM

REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO ECM (D-CAN J/C - ECM (CAN-H, CAN-L))

CHECK CAN BUS LINES FOR SHORT CIRCUIT (BRAKE ACTUATOR (SKID CONTROL ECU) BRANCH WIRE)

Wire Harness Side:

Brake Actuator (Skid Control ECU)

Connector

A'' A

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tU 1 23 II 24 II25II26I27I2BII29I30I31II32I33I34I Iii

Front View

H

C118165E05

1or" "nor

Wire Harness Side:

D-CAN J/C Connector

(a) Disconnect the A15 brake actuator (skid control ECU) connector.

(b) Measure the resistance. HINT:

The resistance must be measured after the D41 D-CAN

J/C connector is disconnected.

Result

Tester Connection

Condition

Specified Condition

Proceed to

D41-1 (ABS) -D41-12 (ABS)

Ignition switch OFF

1 Q or higher

OK

D41-1 (ABS) -D41-12 (ABS)

Ignition switch OFF

Below 1 Q

REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU)

REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO BRAKE ACTUATOR (D-CAN J/C -BRAKE ACTUATOR (SKID CONTROL ECU) (CAN-H, CAN-L))

CHECK CAN BUS LINES FOR SHORT CIRCUIT (AIR CONDITIONING AMPLIFIER BRANCH WIRE)

Wire Harness Side:

Air Conditioning Amplifier Connector

(a) Disconnect the E8 air conditioning amplifier connector.

ru Ln

Wire Harness Side:

D-CAN J/C Connector

C131847E04

(b) Measure the resistance. HINT:

The resistance must be measured after the D41 D-CAN J/C connector is disconnected.

Result

Tester Connection

Condition

Specified Condition

Proceed to

D41-6 (A/C) - D41-17 (A/C)

Ignition switch OFF

1 Q or higher

OK

D41-6 (A/C) - D41-17 (A/C)

Ignition switch OFF

Below 1 Q

NG

REPLACE AIR CONDITIONING AMPLIFIER

REPLACE AIR CONDITIONING AMPLIFIER

REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO AIR CONDITIONING AMPLIFIER (D-CAN J/C - AIR CONDITIONING AMPLIFIER (CAN-H, CAN-L))

CHECK CAN BUS LINES FOR SHORT CIRCUIT (CENTER AIRBAG SENSOR ASSEMBLY BRANCH WIRE)

Wire Harness Side:

Center Airbag Sensor Assembly Connector

C131069E01

Wire Harness Side:

D-CAN J/C Connector ior" "nor

(a) Disconnect the D16 center airbag sensor assembly connector.

(b) Measure the resistance. HINT:

The resistance must be measured after the D41 D-CAN J/C connector is disconnected.

Result

Tester Gonnection

Condition

Specified Gondition

Proceed to

D41-B (A/B) - D41-1S (A/B)

Ignition switch OFF

1 Q or higher

OK

D41-B (A/B) - D41-1S (A/B)

Ignition switch OFF

Below 1 Q

REPLACE CENTER AIRBAG SENSOR ASSEMBLY

REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO CENTER AIRBAG SENSOR ASSEMBLY (D-CAN J/C - CENTER AIRBAG SENSOR ASSEMBLY (CAN-H, CAN-L))

CHECK CAN BUS LINES FOR SHORT CIRCUIT (P-CAN J/C - POWER STEERING ECU)

Wire Harness Side:

P-CAN J/C Connector

1ST "TOT

(a) Measure the resistance. HINT:

The resistance must be measured after the D42 P-CAN J/C connector is disconnected. Standard resistance

Tester Connection

Condition

Specified Condition

D42-4 (EPS) - D42-15 (EPS)

Ignition switch OFF

Go to step 17

C125896E28

CHECK CAN BUS LINES FOR SHORT CIRCUIT (P-CAN J/C - MAIN BODY ECU)

(a) Measure the resistance. HINT:

The resistance must be measured after the D42 P-CAN J/C connector is disconnected.

Result

Tester Connection

Condition

Specified Condition

Proceed to

D42-5 (J/B) - D42-16 (J/B)

Ignition switch OFF

Below 1 Q

A

D42-5 (J/B) - D42-16 (J/B)

Ignition switch OFF

1 Q or higher

Go to step 18

CHECK CAN BUS LINES FOR SHORT CIRCUIT (P-CAN J/C - COMBINATION METER ECU)

Wire Harness Side:

P-CAN J/C Connector isr "nor

IP"

MET

C125896E32

(a) Measure the resistance. HINT:

The resistance must be measured after the D42 P-CAN J/C connector is disconnected.

Result

Tester Connection

Condition

Specified Condition

Proceed to

D42-7 (MET) -D42-18 (MET)

Ignition switch OFF

Below 1 Q

A

D42-7 (MET) -D42-18 (MET)

Ignition switch OFF

1 Q or higher

Go to step 19

REPLACE P-CAN J/C (JUNCTION CONNECTOR)

CHECK CAN BUS LINES FOR SHORT CIRCUIT (POWER STEERING ECU MAIN WIRE)

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

Don't pay hundreds of dollars to find out what is wrong with your car. This book is dedicated to helping the do it yourself home and independent technician understand and use OBD-II technology to diagnose and repair their own vehicles.

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