Inspection procedure

NOTICE:

• Turn the ignition switch OFF before measuring the resistances of the CAN main wire and the CAN branch wire.

• After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not in operation.

• 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. If doors need to be opened in order to check connectors, open the doors and leave them open.

HINT:

Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

HINT:

• Perform the following inspection for the ECUs (sensors) which are not displayed on the intelligent tester. If malfunction cannot be identified, then perform the following inspections for the ECUs (sensors) connected to CAN communication.

• Do not remove the power steering ECU and ECM, as they are the end parts of the circuit. If removed, CAN communication will not be possible.

• The open circuit confirmation of the power steering ECU, ECM and main wire is performed in the CHECK CAN BUS LINE procedure of HOW TO PROCEED WITH TROUBLESHOOTING. This inspection only has procedures for checking for an open circuit on one side of the CAN branch wire.

CHECK OPEN IN ONE SIDE OF CAN BRANCH WIRE (BRAKE ACTUATOR (SKID CONTROL ECU))

Wire Harness Side:

Brake Actuator (Skid Control ECU) Connector

Front View

C118165E05

NOTICE:

For vehicles without ABS, go to step 3.

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

(b) Select "BUS CHECK" on the intelligent tester via the CAN VIM (See page CA-22).

Result

Result

Proceed to

"ABS/VSC/TRAC" not displayed on intelligent tester.

A

Several ECUs and sensors other than "ABS/VSC/TRAC" not displayed on intelligent tester.

Go to step 3

CHECK OPEN IN ONE SIDE OF CAN BRANCH WIRE (BRAKE ACTUATOR (SKID CONTROL ECU) BRANCH WIRE)

Wire Harness Side:

Brake Actuator (Skid Control ECU) Connector

CANL

CANL

CANH

Front View

Front View

CANH

(a) Measure the resistance. HINT:

The resistance must be measured after the A15 brake actuator (skid control ECU) connector is disconnected. Standard resistance

Tester Connection

Condition

Specified Condition

A15-6 (CANH) - A15-5 (CANL)

Ignition switch OFF

54 to 69 Q

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

C118165E03

REPLACE BRAKE ACTUATOR (SKID CONTROL ECU)

CHECK OPEN IN ONE SIDE OF CAN BRANCH WIRE (AIR CONDITIONING AMPLIFIER)

Wire Harness Side:

Air Conditioning Amplifier Connector n_i L_n

C131847E04

NOTICE:

For vehicles without air conditioning or PTC heater, go to step 5.

(a) Disconnect the E8 air conditioning amplifier connector.

(b) Select "BUS CHECK" on the intelligent tester via the CAN VIM (See page CA-22).

Result

Result

Proceed to

"A/C" not displayed on intelligent tester.

A

Several ECUs and sensors other than "A/C" not displayed on intelligent tester.

Go to step 5

CHECK OPEN IN ONE SIDE OF CAN BRANCH WIRE (AIR CONDITIONING AMPLIFIER BRANCH WIRE)

(a) Measure the resistance. HINT:

The resistance must be measured after the E8 air conditioning amplifier connector is disconnected. Standard resistance

Tester Connection

Condition

Specified Condition

E8-2 (TX+) - E8-3 (TX-)

Ignition switch OFF

54 to 69 Q

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

REPLACE AIR CONDITIONING AMPLIFIER

CHECK OPEN IN ONE SIDE OF CAN BRANCH WIRE (CENTER AIRBAG SENSOR ASSEMBLY)

Wire Harness Side:

Center Airbag Sensor Assembly Connector

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

(b) Select "BUS CHECK" on the intelligent tester via the CAN VIM (See page CA-22).

Result

Result

Proceed to

"SRS AIRBAG" not displayed on intelligent tester.

A

Several ECUs and sensors other than "SRS AIRBAG" not displayed on intelligent tester.

Go to step 7

CHECK OPEN IN ONE SIDE OF CAN BRANCH WIRE (CENTER AIRBAG SENSOR ASSEMBLY BRANCH WIRE)

Wire Harness Side:

Center Airbag Sensor Assembly Connector

CANH

CANH

CANL

C131069E06

(a) Measure the resistance. HINT:

The resistance must be measured after the D16 center airbag sensor assembly connector is disconnected. Standard resistance

Tester Connection

Condition

Specified Condition

D16-13 (CANH) - D16-22 (CANL)

Ignition switch OFF

54 to es Q

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

REPLACE CENTER AIRBAG SENSOR ASSEMBLY

CHECK OPEN IN ONE SIDE OF CAN BRANCH WIRE (MAIN BODY ECU)

Wire Harness Side:

Main Body ECU Connector

(a) Disconnect the D33 main body ECU connector.

(b) Select "BUS CHECK" on the intelligent tester via the CAN VIM (See page CA-22).

Result

Result

Proceed to

"MAIN BODY" not displayed on intelligent tester.

A

Several ECUs and sensors other than "MAIN BODY" not displayed on intelligent tester.

Go to step S

CHECK OPEN IN ONE SIDE OF CAN BRANCH WIRE (MAIN BODY ECU BRANCH WIRE)

Wire Harness Side:

Main Body ECU Connector

CANL

CANL

CANH

(a) Measure the resistance. HINT:

The resistance must be measured after the D33 main body ECU connector is disconnected. Standard resistance

Tester Connection

Condition

Specified Condition

D33-23 (CANH) - D33-22 (CANL)

Ignition switch OFF

54 to 69 Q

REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO MAIN BODY ECU (CAN-H, CAN-L)

C131840E01

REPLACE MAIN BODY ECU

CHECK OPEN IN ONE SIDE OF CAN BRANCH WIRE (COMBINATION METER ECU)

Wire Harness Side:

Combination Meter ECU Connector

CANH

CANL

P|11|12

Front View

(a) Disconnect the D1 combination meter ECU connector.

(b) Measure the resistance. Standard resistance

Tester Connection

Condition

Specified Condition

D1-20 (CANH) - D1-20 (CANL)

Ignition switch OFF

54 to 69 Q

REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO COMBINATION METER ECU (CAN-H, CAN-L)

C139156E02

REPLACE COMBINATION METER ECU

CHARGING SYSTEM PRECAUTION

1. Check that the battery cables are connected to the correct terminals.

2. Disconnect the battery cables when the battery is given a quick charge.

3. Never disconnect the battery while the engine is running.

4. Check that the charging cable is tightly connected to terminal B of the generator.

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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