DTC B1207: Smart ECU Stop: Procedure

1. Remove the SECURITY fuse from the main body ECU LH (cowl side junction block LH).
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   SECURITY fuse	Always	Below 1 Ω

NG → REPLACE FUSE (SECURITY) 

OK: Go to next step 

1. Disconnect the P33 connector.
   Fig 1: Identifying P33 Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage and resistance according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   P33-1 (+B1) - Body ground	Always	11 to 14 V

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   P33-17 (E) - Body ground	Always	Below 1 Ω

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

OK: Go to next step 

1. Disconnect the P33, RJ and M18 connectors.
   Fig 2: P33, RJ And M18 Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   P33-27 (MPX1) - RJ-21 (MPX1)	Always	Below 1 Ω
   P33-28 (MPX2) - M18-2 (MPX2)	Always	Below 1 Ω

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   4