Inspection Procedure

WARNING: This page is about a different car, the 2008 Toyota Yaris. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

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 Techstream. 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))

NOTE: For vehicles without ABS, go to step 3.

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

Select "Communication Bus Check" on the Techstream (See DIAGNOSIS SYSTEM ).

Result

RESULT CHART

Result	Proceed to
"ABS/VSC/TRAC" not displayed on Techstream.	A
Several ECUs and sensors other than "ABS/VSC/TRAC" not displayed on Techstream.	B

Fig 1: Checking CAN Bus Lines For Short Circuit

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

B: Go to step 3

A: GO TO NEXT STEP

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

Measure the resistance.

HINT:

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

Standard resistance

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Condition	Specified Condition
A15-6 (CANH) -A15-5 (CANL)	Ignition switch OFF	54 to 69 Ω

Fig 2: Checking Open In One Side Of CAN Branch Wire (Brake Actuator Branch Wire)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

OK: REPLACE BRAKE ACTUATOR (SKID CONTROL ECU)

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

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

Disconnect the E8 air conditioning amplifier connector.

Select "CAN Bus Check" on the Techstream (See DIAGNOSIS SYSTEM ).

Result

RESULT CHART

Result	Proceed to
"Air Conditioner" not displayed on Techstream.	A
Several ECUs and sensors other than "Air Conditioner" not displayed on Techstream.	B

Fig 3: Checking CAN Bus Lines For Short Circuit

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

B: Go to step 5

A: GO TO NEXT STEP

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

Measure the resistance.

HINT:

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

Standard resistance

RESISTANCE SPECIFICATION CONDITION CHART

Tester Connection	Condition	Specified Condition
E8-2 (TX+) - E8-3 (TX-)	Ignition switch OFF	54 to 69 Ω

Fig 4: Checking Open In One Side Of CAN Branch Wire (Air Conditioning Amplifier Branch Wire)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

OK: REPLACE AIR CONDITIONING AMPLIFIER

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

Disconnect the D16 center airbag sensor assembly connector.

Select "CAN Bus Check" on the Techstream (See DIAGNOSIS SYSTEM ).

Result

RESISTANCE SPECIFICATION CONDITION CHART

Result	Proceed to
"SRS Airbag" not displayed on Techstream.	A
Several ECUs and sensors other than "SRS Airbag" not displayed on Techstream.	B

Fig 5: Checking CAN Bus Lines For Short Circuit (Center Airbag Sensor Assembly Branch Wire)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

B: Go to step 7

A: GO TO NEXT STEP

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

Measure the resistance.

HINT:

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

Standard resistance

RESISTANCE SPECIFICATION CONDITION CHART

Tester Connection	Condition	Specified Condition
D16-13(CANH)-D16-22 (CANL)	Ignition switch OFF	54 to 69 Ω

Fig 6: Checking Open In One Side Of CAN Branch Wire (Center Airbag Sensor Assembly Branch Wire)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

OK: REPLACE CENTER AIRBAG SENSOR ASSEMBLY

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

Disconnect the D33 main body ECU connector.

Select "CAN Bus Check" on the Techstream (See DIAGNOSIS SYSTEM ).

Result

RESULT CHART

Result	Proceed to
"Main Body" not displayed on Techstream.	A
Several ECUs and sensors other than "Main Body" not displayed on Techstream.	B

Fig 7: Checking CAN Bus Lines For Short Circuit (Main Body ECU Branch Wire)

B: Go to step 9

A: GO TO NEXT STEP

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

Measure the resistance.

HINT:

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

Standard resistance

RESISTANCE SPECIFICATION CONDITION CHART

Tester Connection	Condition	Specified Condition
D33-23(CANH)-D33-22 (CANL)	Ignition switch OFF	54 to 69 Ω

Fig 8: Checking Open In One Side Of CAN Branch Wire (Main Body ECU Branch Wire)

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

OK: REPLACE MAIN BODY ECU

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

Disconnect the D1 combination meter ECU connector.

Measure the resistance.

Standard resistance

RESISTANCE SPECIFICATION CONDITION CHART

Tester Connection	Condition	Specified Condition
D1-20(CANH)-D1-20 (CANL)	Ignition switch OFF	54 to 69 Ω

Fig 9: Checking Open In One Side Of CAN Branch Wire (Combination Meter ECU)

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

OK: REPLACE COMBINATION METER ECU