DTC B1207: Smart ECU Stop: Procedure

1. Remove the SECURITY 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 

1. Disconnect the P33 ECU connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Measure the voltage and resistance of the wire harness side connector.

   Standard voltage

   Tester Connection	Condition	Specified Condition
   +B1 (P33-1) - Body ground	Always	10 to 14 V

   Standard resistance

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

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the P33, RJ and M17 ECU connectors.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Measure the resistance between the specified terminals on the wire harness side connectors.

   Standard resistance

   Tester Connection	Specified Condition
   MPX1 (P33-27) - MPX1 (RJ-21)	Below 1 Ω
   MPX2 (P33-28) - MPX2 (M17-2)	Below 1 Ω

   Result

   Result	Proceed to
   Both are OK	A
   One is OK	B
   Both are NG	C

B → REPAIR OR REPLACE HARNESS OR CONNECTOR AND REPLACE CERTIFICATION ECU 

C → REPAIR OR REPLACE HARNESS OR CONNECTOR 

A → REPLACE CERTIFICATION ECU