AFS ECU Power Source Circuit: Procedure

Fig 1: Identifying AFS ECU Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Measure the voltage of the connector.

   Standard voltage

   Tester Connection	Condition	Specified Condition
   A29-1 - A29-2	Engine switch off	Below 1 V
   A29-1 - A29-2	Engine switch on (IG)	10 to 14 V

NG → See step   2 

OK → PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

Fig 2: Disconnecting A29 Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the A29 connector.
2. Measure the resistance of the wire harness side connector.

   Standard resistance

   Tester Connection	Condition	Specified Condition
   A29-1 - Body ground	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS AND CONNECTOR (AFS ECU - BODY GROUND) 

OK: Go to next step 

Fig 3: Disconnecting A29 Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the A29 connector.
2. Measure the voltage of the connector.

   Standard voltage

   Tester Connection	Condition	Specified Condition
   A29-1 - A29-2	Engine switch on (IG)	10 to 14 V

NG → REPAIR OR REPLACE HARNESS AND CONNECTOR(AFS ECU - BATTERY) 

OK → REPLACE AFS ECU