Diagnosis Circuit [08/2015 - 08/2017]: Procedure

1. Check if a CAN communication system DTC is output (Refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2015 - 08/2017] ).
   RESULT
   
   

   Result	Proceed to
   DTC is not output	A
   DTC is output	B

Result: 

B 

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS 

(Refer to DIAGNOSTIC TROUBLE CODE CHART [08/2015 - 08/2017] )

Result: 

A 

See step  2

1. Turn the ignition switch off.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Disconnect the A27 ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H19-13 (TC) - A27-16 (TC)	Always	Below 1 Ω

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   H19-4 (CG) - Body ground	Always	Below 1 Ω

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

1. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A27-16 (TC) - Body ground	Always	1 MΩ or higher

   RESULT
   
   

   Result	Proceed to
   OK (for 3UR-FE)	A
   OK (for 3UR-FBE)	B
   NG	C

Result: 

A 

REPLACE ECM 

(Refer to REMOVAL [08/2015 - ] )

Result: 

B 

REPLACE ECM 

(Refer to REMOVAL [08/2015 - 08/2018] )

Result: 

C 

REPAIR OR REPLACE HARNESS OR CONNECTOR OR EACH ECU