ECM Power Source Circuit [10/2017 - ]: Procedure

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the semiconductor power integration ECU connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   2B-1 - Body ground	Always	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - SEMICONDUCTOR POWER INTEGRATION ECU) 

Result: 

OK 

See step  2

1. Disconnect the semiconductor power integration ECU connector.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   2D-14 - Body ground	Always	Below 1 Ω
   2G-5 - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Inspect the semiconductor power integration ECU (EFI-MAIN relay, IG2 relay).

   Refer to INSPECTION [04/2013 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE SEMICONDUCTOR POWER INTEGRATION ECU. Refer to  REMOVAL [04/2013 - ] 

Result: 

OK 

See step  4

1. Disconnect the semiconductor power integration ECU connector.
2. Disconnect the ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   2F-4 - A106-4 (IGSW)	Always	Below 1 Ω
   2G-6 - A106-46 (MREL)	Always	Below 1 Ω
   2G-8 - A106-2 (+B)	Always	Below 1 Ω
   2G-7 - A106-3 (+B2)	Always	Below 1 Ω
   2F-4 or A106-4 (IGSW) - Body ground and other terminals	Always	10 kΩ or higher
   2G-6 or A106-46 (MREL) - Body ground and other terminals	Always	10 kΩ or higher
   2G-8 or A106-2 (+B) - Body ground and other terminals	Always	10 kΩ or higher
   2G-7 or A106-3 (+B2) - Body ground and other terminals	Always	10 kΩ or higher

   HINT: 

   If a short is detected in any of the above circuits, there may be a malfunction in the circuit of a connected ECU.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   F102-53 (E1) - Body ground	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  6

1. Disconnect the certification ECU (smart key ECU assembly) connector.
2. Disconnect the semiconductor power integration ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A13-3 (IG1D) - 2E-1	Always	Below 1 Ω
   A13-3 (IG1D) or 2E-1 - Body ground and other terminals	Always	10 kΩ or higher

   HINT: 

   If a short is detected in any of the above circuits, there may be a malfunction in the circuit of a connected ECU.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

CHECK SMART ACCESS SYSTEM WITH PUSH-BUTTON START. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2015 - 11/2021]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - 09/2022]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2022 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR