DTC P0615-19: Starter Relay Circuit Current Above Threshold [12/2021 - 10/2023]: Procedure

Pre-procedure1

1. Disconnect the engine stop and start ECU connector.
2. Remove the BBC NO. 1 and BBC NO. 2 fuses from the NO. 2 engine room relay block and junction block assembly.

   Procedure1

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   B37-1 (BIN2) - BBC NO. 2 fuse terminal 2	Always	Below 1 Ω
   B37-3 (BIN1) - BBC NO. 1 fuse terminal 2	Always	Below 1 Ω
   B37-1 (BIN2) - Body ground	Always	10 kΩ or higher
   B37-3 (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

   Post-procedure1

4. None

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  2

Pre-procedure1

1. Disconnect the engine stop and start ECU connectors.
2. Remove the ST NO. 1 and ST NO. 2 relays from the NO. 2 engine room relay block and junction block assembly.
3. Remove the BBC NO. 1 and BBC NO. 2 fuses from the NO. 2 engine room relay block and 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.

   Procedure1

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   B38-21 (STA) - ST NO. 1 relay terminal 2	Always	Below 1 Ω
   B38-23 (STA2) - ST NO. 2 relay terminal 2	Always	Below 1 Ω
   B38-21 (STA) - Body ground	Always	10 kΩ or higher
   ST NO. 1 relay terminal 2 - Body ground	Always	10 kΩ or higher
   B38-23 (STA2) - Body ground	Always	10 kΩ or higher
   ST NO. 2 relay terminal 2 - Body ground	Always	10 kΩ or higher
   B37-1 (BIN2) - B38-21 (STA)	Always	10 kΩ or higher
   B37-3 (BIN1) - B38-21 (STA)	Always	10 kΩ or higher
   B37-1 (BIN2) - B38-23 (STA2)	Always	10 kΩ or higher
   B37-3 (BIN1) - B38-23 (STA2)	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

   Post-procedure1

8. None

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

Pre-procedure1

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)

   -

   -

   Procedure1

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   B38-21 (STA) - B38-6 (DGND)	Always	10 kΩ or higher
   B38-23 (STA2) - B38-6 (DGND)	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

   Post-procedure1

3. None

Result: 

NG 

REPLACE ENGINE STOP AND START ECU. Refer to  REMOVAL [12/2021 - ] 

Result: 

OK 

See step  4

• for ST NO. 1 relay:

  Refer to PROCEDURE - Step 1

• for ST NO. 2 relay:

  Refer to PROCEDURE - Step 2

Result

Result: 

OK 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2021 - ] 

Result: 

NG 

REPLACE RELAY (ST NO. 1, ST NO. 2 RELAY)