DTC P2530-14: Ignition Switch Circuit Short to Ground or Open [09/2023 - ]: Procedure

1. According to the display on the GTS, read the Data List.

   Powertrain > Stop and Start > Data List 

   Tester Display
   IG Switch

   Result

   Tester Display	Result	Proceed to
   IG Switch	ON	A
   	OFF	B

Result: 

A 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2023 - ] 

Result: 

B 

See step  2

Pre-procedure1

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

• Turn the ignition switch to ON.

• Measure the voltage according to the value(s) in the table below.

  Standard Voltage

  Tester Connection	Switch Condition	Specified Condition	Result
  D26-18 (IGP) - Body ground	Ignition switch ON	9.5 to 14 V	V

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None.

Result: 

NG 

See step  5

Result: 

OK 

See step  3

Pre-procedure1

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

• Turn the ignition switch to ON.

• Measure the voltage according to the value(s) in the table below.

  Standard Voltage

  Tester Connection	Condition	Specified Condition	Result
  B25-1 (+B) - Body ground	Ignition switch ON	9.5 to 14 V	V

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None.

Result: 

OK 

REPLACE ENGINE STOP AND START ECU. Refer to  REMOVAL [09/2023 - ] 

Result: 

NG 

See step  4

Pre-procedure1

• Disconnect the engine stop and start ECU connector.
• Remove the EFI-MAIN NO. 1 relay from the No. 1 engine room relay block and No. 1 junction block assembly.

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

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  B25-1 (+B) - 5 (EFI-MAIN NO. 1 relay holder)	Always	Below 1 Ω	Ω
  B25-1 (+B) - Body ground and other terminals	Always	10 kΩ or higher	kΩ
  5 (EFI-MAIN NO. 1 relay holder) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None.

Result: 

OK 

GO TO ECM POWER SOURCE CIRCUIT. Refer to  ECM Power Source Circuit [09/2023 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Pre-procedure1

• Disconnect the engine stop and start ECU connector.
• Remove the IGP NO. 1 relay from the No. 1 engine room relay block and No. 1 junction block assembly

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

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  D26-18 (IGP) - 5 (IGP NO. 1 relay holder)	Always	Below 1 Ω	Ω
  D26-18 (IGP) - Body ground and other terminals	Always	10 kΩ or higher	kΩ
  5 (IGP NO. 1 relay holder) - Body ground and other terminals	Always	10 kΩ or higher	kΩ

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None.

Result: 

OK 

GO TO SMART ACCESS SYSTEM. Refer to  Power Source Mode does not Change to ON (IG) [09/2023 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR