DTC P0615-19: Starter Relay Circuit Current Above Threshold [11/2021 - 03/2023]: 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
   A28-1 (BIN2) - BBC NO. 2 fuse terminal 2	Always	Below 1 Ω
   A28-3 (BIN1) - BBC NO. 1 fuse terminal 2	Always	Below 1 Ω
   A28-1 (BIN2) - Body ground	Always	10 kΩ or higher
   A28-3 (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 NO. 1 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 ECM connector.
6. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A29-21 (STA) - ST NO. 1 relay terminal 2	Always	Below 1 Ω
   A29-21 (STA) - Body ground	Always	10 kΩ or higher
   ST NO. 1 relay terminal 2 - Body ground	Always	10 kΩ or higher
   A28-1 (BIN2) - A29-21 (STA)	Always	10 kΩ or higher
   A28-3 (BIN1) - A29-21 (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
   A29-21 (STA) - A29-6 (DGND)	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE ENGINE STOP AND START ECU. Refer to  REMOVAL [11/2021 - ] 

Result: 

OK 

See step  4

1. Inspect the ST NO. 1 relay.

   for T24A-FTS: Refer to ON-VEHICLE INSPECTION [11/2021 - ]

   for A25A-FKS: Refer to ON-VEHICLE INSPECTION [11/2021 - ]

   Result

   Proceed to
   OK
   NG

Result: 

OK 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - ] 

Result: 

NG 

REPLACE RELAY (ST NO. 1 RELAY)