Inspection Procedure

WARNING: This page is about a different car, the 2009 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

Turn the ignition switch off before measuring the resistance of the main CAN bus wires and the CAN Bus 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 any doors need to be opened in order to check the connectors, open the doors and leave them open.

HINT:

Operating the ignition switch, any other switches, or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.
Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below will help determine the cause of the malfunction.

CHECK CAN BUS WIRE (MAIN WIRE FOR DISCONNECTION, CAN BUS LINES FOR SHORT CIRCUIT)

Turn the ignition switch off.
Measure the resistance according to the value (s) in the table below.

Standard Resistance

STANDARD RESISTANCE SPECIFICATION

Tester Connection	Switch Condition	Result	Proceed to
E11-6 (CANH) - E11-14 (CANL)	Ignition switch off	54 to 69 Ω	A
E11-6 (CANH) - E11-14 (CANL)	Ignition switch off	70 Ω or higher	B
E11-6 (CANH) -E11-14 (CANL)	Ignition switch off	Below 54 Ω	C

B: CHECK FOR OPEN IN CAN MAIN BUS LINE (See OPEN IN CAN MAIN BUS LINE )

C: CHECK CAN BUS LINES FOR SHORT CIRCUIT (See CHECK CAN BUS LINES FOR SHORT CIRCUIT )

Fig 1: Identifying E11 DLC3

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

A: Go to Next Step

CHECK FOR SHORT TO B+ IN CAN BUS WIRE

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

Standard Resistance

STANDARD RESISTANCE SPECIFICATION

Tester Connection	Condition	Specified Condition
E11-6 (CANH) - E11-16 (BAT)	Cable is disconnected from negative (-) battery terminal	6 kΩ or higher
E11-14 (CANL) - E11-16 (BAT)	Cable is disconnected from negative (-) battery terminal	6 kΩ or higher

Fig 2: Identifying E11 DLC3

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG: CHECK CAN BUS LINE FOR SHORT TO +B (See CHECK CAN BUS LINE FOR SHORT TO +B )

OK: Go to Next Step

CHECK FOR SHORT TO GND IN CAN BUS WIRE

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

Standard Resistance

STANDARD RESISTANCE SPECIFICATION

Tester Connection	Switch Condition	Specified Condition
E11-6 (CANH) - E11-4 (CG)	Ignition switch off	200 Ω or higher
E11-14 (CANL) - E11-4 (CG)	Ignition switch off	200 Ω or higher

Fig 3: Identifying E11 DLC3

NG: CHECK CAN BUS LINE FOR SHORT TO GND (See CHECK CAN BUS LINE FOR SHORT TO GND )

OK: GO TO HOW TO PROCEED WITH TROUBLESHOOTING (See HOW TO PROCEED WITH TROUBLESHOOTING )