Inspection Procedure

HINT:

When "+B of GND short malfunction of communication bus" DTCs (B1266 and B1267) are detected at the same time as "communication stop" DTC B1205, repair the "+B or GND short malfunction of communication bus" DTCs first.

1. INSPECT FUSE (H-LP LVL) 
   1. Remove the H-LP LVL fuse from the cowl side J/B LH.
   2. Measure the resistance of the fuse.

      Standard resistance: 

      Below 1 Ω 

   NG: REPLACE FUSE 

   OK: Go to next step 

2. CHECK WIRE HARNESS (AFS ECU - BATTERY AND BODY GROUND) 
   1. Disconnect the A27 ECU connector.
   2. Turn the engine switch on (IG).
   3. Measure the voltage and resistance of the wire harness side connector.

   Standard voltage 

   TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART
   
   

   Tester Connection	Condition	Specified Condition
   IG (A27-2) - Body ground	Engine switch on (IG)	10 to 14 V

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION REFERENCE CHART
   
   

   Tester Connection	Specified Condition
   E1 (A27-1) - Body ground	Below 1 Ω

   Fig 1: Identifying A27 ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   OK: Go to next step 

3. CHECK RESISTANCE OF COMMUNICATION LINE 
   1. Disconnect the A27, J58 and J34 ECU connectors.
   2. Measure the resistance between the specified terminals on the wire harness side connectors.

   Standard resistance 

Result 

Fig 2: Identifying A27, J58 And J34 ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

B: REPLACE AFS ECU AND REPAIR OR REPLACE HARNESS OR CONNECTOR 

C: REPAIR OR REPLACE HARNESS OR CONNECTOR 

A: REPLACE AFS ECU