DTC P0615-11: Starter Relay Circuit Short to Ground [11/2023 - ]: Procedure

1. Disconnect the engine stop and start ECU connector.
2. Remove the BBC NO. 1 and BBC NO. 2 fuses from the No. 1 engine room relay block and No. 1 junction block assembly.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A33-1 (BIN2) - BBC NO. 2 fuse terminal 2	Always	Below 1 Ω
   A33-3 (BIN1) - BBC NO. 1 fuse terminal 2	Always	Below 1 Ω
   A33-1 (BIN2) - Body ground	Always	10 kΩ or higher
   A33-3 (BIN1) - Body ground	Always	10 kΩ or higher
   BBC NO. 1 fuse terminal 2 - Body ground	Always	10 kΩ or higher
   BBC NO. 2 fuse terminal 2 - Body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  2

1. Disconnect the engine stop and start ECU connectors.
2. Remove the ST relay from the No. 1 engine room relay block and No. 1 junction block assembly.
3. Remove the BBC NO. 1 and BBC NO. 2 fuses from the No. 1 engine room relay block and No. 1 junction block assembly.
4. Disconnect the certification ECU (smart key ECU assembly) connector.
5. Disconnect the park/neutral position switch assembly connector.
6. Disconnect the ECM connector.
7. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A34-21 (STA) - ST relay terminal 2	Always	Below 1 Ω
   A34-21 (STA) - Body ground	Always	10 kΩ or higher
   ST relay terminal 2 - Body ground	Always	10 kΩ or higher
   A33-1 (BIN2) - A34-21 (STA)	Always	10 kΩ or higher
   A33-3 (BIN1) - A34-21 (STA)	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Disconnect the engine stop and start ECU connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a

   Component without harness connected (Engine Stop and Start ECU)

   -

   -

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A34-21 (STA) - A34-6 (DGND)	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE ENGINE STOP AND START ECU. Refer to  REMOVAL [11/2023 - ] 

Result: 

OK 

See step  4

1. Inspect the ST relay.

   Refer to ON-VEHICLE INSPECTION [10/2022 - ]

   Result

   Proceed to
   OK
   NG

Result: 

OK 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ] 

Result: 

NG 

REPLACE RELAY (ST RELAY)