Inspection Procedure

NOTE: Turn the ignition switch off before measuring the resistances of CAN bus main wires and CAN bus branch wires.

CHECK FOR OPEN IN CAN BUS WIRE (ECU MAIN BUS WIRE)

Disconnect the ECM connector (E5).

Measure the resistance according to the value(s) in the table below.

Standard resistance

RESISTANCE SPECIFIED CONDITIONS

Tester Connection	Condition	Specified Condition
E5-15 (CANH) - E5-31 (CANL)	Ignition switch off	108 to 132 Ω

Fig 1: Identifying Terminal CANL And CANH Of E5 ECM Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR

OK: Go to next step

CHECK ECM POWER SOURCE CIRCUIT

Check the ECM power source circuit (See ECM POWER SOURCE CIRCUIT ).

Result

RESULT CHART

Result	Proceed
OK (w/VSC)	A
OK (w/o VSC)	B
NG	C

B: Go to step 3

C : REPLACE ECM POWER SOURCE CIRCUIT

A: Go to next step

CHECK DLC3

Turn the ignition switch off.

Measure the resistance according to the value(s) in the table below.

Fig 2: Identifying DLC3 Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard resistance

RESISTANCE SPECIFIED CONDITIONS

Tester Connection	Condition	Specified Condition	Result
D1-6 (CANH) - D1-14 (CANL)	Ignition switch off	54 to 69 Ω	Below 53 Ω: Short in line
			108 to 132 Ω or more: Open in main wire
			133 Ω, or more: Open in DLC3 branch wire
D1-6 (CANH) - D1-16 (BAT)	Negative battery terminal disconnected	6 kΩ or more	Below 6 kΩ: +B short
D1-14 (CANL) - D1-16 (BAT)	Negative battery terminal disconnected	6 kΩ or more	Below 6 kΩ: +B short
D1-6 (CANH) - D1-4 (CG)	Ignition switch off	200 Ω or more	Below 200 Ω: GND short
D1-14 (CANL) - D1-4 (CG)	Ignition switch off	200 Ω or more	Below 200 Ω: GND short

Result

RESULT CHART

Result	Proceed
OK	A
Open in DLC3 branch wire	B
Open in main wire	C
Short in line, +B short, GND short	D

B: REPAIR OR REPLACE DLC3 BRANCH WIRE OR CONNECTOR

C: Go to step 4

D: Go to step 6

A: REPLACE ECM (See REMOVAL )

CHECK FOR OPEN IN CAN BUS WIRE

Disconnect the ECM main wire connector from CAN junction connector.

Fig 3: Identifying J16 CAN Junction Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance according to the value(s) in the table below.

Standard resistance

RESISTANCE SPECIFIED CONDITIONS

Tester Connection	Condition	Specified Condition
D1-6 (CANH) - D1-14 (CANL)	Ignition switch off	108 to 132 Ω

Fig 4: Identifying Terminal CANL And CANH Of DLC3 Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPLACE JUNCTION CONNECTOR

OK: Go to next step

CHECK FOR OPEN IN CAN BUS WIRE

Reconnect the ECM main wire connector to CAN junction connector.
Disconnect ECM connector (E5).

Measure the resistance according to the value(s) in the table below.

Standard resistance

RESISTANCE SPECIFIED CONDITIONS

Tester Connection	Condition	Specified Condition
E5-15 (CANH) - E5-31 (CANL)	Ignition switch off	108 to 132 Ω

Fig 5: Identifying Terminal CANL And CANH Of E5 ECM Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: REPAIR OR REPLACE CAN BUS MAIN WIRE (CAN JUNCTION CONNECTOR - ECM)

OK: REPLACE ECM (See REMOVAL )

CHECK FOR SHORT IN CAN BUS WIRES (DLC3)

Disconnect the DLC3 branch wire connector from the CAN junction connector.

Fig 6: Identifying J15 CAN Junction Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance according to the value(s) in the table below.

Standard resistance

RESISTANCE SPECIFIED CONDITIONS

Tester Connection	Condition	Specified Condition
D1-6 (CANH) - D1-14 (CANL)	Ignition switch off	1 MΩ or more
D1-6 (CANH) - D1-16 (BAT)	Negative battery terminal disconnected	6 kΩ. or more
D1-14 (CANL) - D1-16 (BAT)	Negative battery terminal disconnected	6 kΩ or more
D1-6 (CANH) - D1-4 (CG)	Ignition switch off	200 Ω or more
D1-14 (CANL) - D1-4 (CG)	Ignition switch off	200 Ω or more

Fig 7: Identifying DLC3 Connector Terminals

NG: CHECK FOR OPEN IN CAN BUS WIRE

OK: Go to next step

CHECK FOR SHORT IN CAN BUS WIRES (CAN JUNCTION CONNECTOR - ECM)

Reconnect the DLC3 branch wire connector to CAN junction connector.
Disconnect the ECM main wire connector from the CAN junction connector.

Fig 8: Identifying J16 CAN Junction Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance according to the value(s) in the table below.

Standard resistance

RESISTANCE SPECIFIED CONDITIONS

Tester Connection	Condition	Specified Condition
D1-6 (CANH) - D1-14 (CANL)	Ignition switch off	1 MΩ or more
D1-6 (CANH) - D1-16 (BAT)	Negative battery terminal disconnected	6 kΩ or more
D1-14 (CANL) - D1-16 (BAT)	Negative battery terminal disconnected	6 kΩ or more
D1-6 (CANH) - D1-4(CG)	Ignition switch off	200 Ω or more
D1-14 (CANL) - D1-4 (CG)	Ignition switch off	200 Ω or more

Fig 9: Identifying DLC3 Connector Terminals

NG: REPLACE JUNCTION CONNECTOR

OK: Go to next step

CHECK FOR SHORT IN CAN BUS WIRES (CAN JUNCTION CONNECTOR - ECM)

Reconnect the ECM main wire connector to CAN junction connector.
Disconnect the ECM connector (E5).

Fig 10: Identifying Terminal CANH And CANL Of E5 ECM Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Measure the resistance according to the value(s) in the table below.

Standard resistance

RESISTANCE SPECIFIED CONDITIONS

Tester Connection	Condition	Specified Condition
D1-6 (CANH) - D1-14 (CANL)	Ignition switch off	1 MΩ or more
D1-6 (CANH) - D1-16 (BAT)	Negative battery terminal disconnected	6 kΩ or more
D1-14 (CANL) - D1-16 (BAT)	Negative battery terminal disconnected	6 kΩ or more
D1-6 (CANH) - D1-4 (CG)	Ignition switch off	200 Ω or more
D1-14 (CANL) - D1-4 (CG)	Ignition switch off	200 Ω or more

Fig 11: Identifying DLC3 Connector Terminals

NG: REPAIR OR REPLACE CAN BUS MAIN WIRE (CAN JUNCTION CONNECTOR - ECM)

OK: REPLACE ECM (See REMOVAL )