Inspection Procedure

HINT:

• The following is the troubleshooting procedures of an open in either CANH or CANL of the ECU A (SENSOR A).
• 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 the CAN communication.

1. CHECK FOR AN OPEN IN ONE SIDE OF THE CAN SUB BUS LINE 
   1. Disconnect the connector with terminals CANH and CANL of the ECU A (SENSOR A).
   2. Select "Check the ECU connected to CAN BUS" on the intelligent tester.

      Result 

      RESULT CHART
      
      

      A	Only ECU is not displayed in the intelligent tester.
      B	Several ECUs and sensor are not displayed on the intelligent tester.

   Fig 1: Identifying ECU Connector With Terminals CANH And CANL

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   B: CHECK FOR MALFUNCTIONING ECU (SENSOR) BY CONNECTING CONNECTOR OF ECU A 

   A: Go to next step 

2. CHECK FOR AN OPEN IN ONE SIDE OF THE CAN SUB BUS LINE 
   1. Measure the resistance according to the value (s) in the table below.

      Standard resistance: 

      54 to 69 Ω 

   Fig 2: Identifying ECU Connector With Terminals CANH And CANL

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE ECU A SUB BUS LINE OR CONNECTOR 

   OK: REPLACE ECU A (SENSOR A)