DTC P2530-14: Ignition Switch Circuit Short to Ground or Open [11/2018 - 10/2023]: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Turn the Techstream on.
4. Enter the following menus: Powertrain / Stop and Start / Data List / IG Switch.

   Powertrain > Stop and Start > Data List 

   Tester Display
   IG Switch

5. According to the display on the Techstream, read the Data List.

   Result

   Techstream Display	Result	Proceed to
   IG Switch	ON	A
   	OFF	B

Result: 

A 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - ] 

Result: 

B 

See step  2

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Turn the ignition switch to ON.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A32-18 (IG2) - Body ground	Ignition switch ON	9.5 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  6

Result: 

OK 

See step  3

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Turn the ignition switch to ON.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   A34-1 (+B) - Body ground	Ignition switch ON	9.5 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE ENGINE STOP AND START ECU. Refer to  REMOVAL [11/2018 - 10/2019]  , or refer to  REMOVAL [10/2019 - 08/2020]  , or refer to  REMOVAL [08/2020 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023] 

Result: 

NG 

See step  4

1. Disconnect the engine stop and start ECU connector.
2. Remove the EFI-MAIN NO. 1 relay 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
   A34-1 (+B) - 5 (EFI-MAIN NO. 1 relay)	Always	Below 1 Ω
   A34-1 (+B) or 5 (EFI-MAIN NO. 1 relay) - Body ground and other terminals	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

1. Inspect the EFI-MAIN NO. 1 relay.

   Refer to PROCEDURE - Step 1

   Result

   Proceed to
   OK
   NG

Result: 

OK 

GO TO ECM POWER SOURCE CIRCUIT. Refer to  ECM Power Source Circuit [11/2018 - 08/2020]  , or refer to  ECM Power Source Circuit [08/2020 - ] 

Result: 

NG 

REPLACE EFI-MAIN NO. 1 RELAY 

1. Disconnect the engine stop and start ECU connector.
2. Disconnect the instrument panel junction block assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A32-18 (IG2) - 4D-32	Always	Below 1 Ω
   A32-18 (IG2) or 4D-32 - Body ground and other terminals	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  7

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the instrument panel junction block assembly connector.
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   4L-1 - Body ground	Always	11 to 14 V

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) 

Result: 

OK 

See step  8

1. Remove the instrument panel junction block assembly.
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   4L-1 - 4D-32	Battery positive (+) → 4A-17 Battery negative (-) → 4D-3	Below 1 Ω
   4L-1 - 4D-32	Battery not connected to 4A-17 and 4D-3	10 kΩ or higher

   Result

   Result	Proceed to
   OK (w/ Smart Key System)	A
   OK (w/o Smart Key System)	B
   NG	C

Result: 

B 

See step  10

Result: 

C 

REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (IG2 NO. 2 RELAY) 

Result: 

A 

See step  9

1. Disconnect the instrument panel junction block assembly connector.
2. Disconnect the certification ECU (smart key ECU assembly) connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   4A-17 - G54-17 (IG1D)	Always	Below 1 Ω
   4A-17 or G54-17 (IG1D) - Body ground and other terminals	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

GO TO SMART KEY SYSTEM. Refer to  Power Source Mode does not Change to ON (IG) [11/2018 - ] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Disconnect the instrument panel junction block assembly connector.
2. Disconnect the ignition or starter switch assembly connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   4A-17 - G28-8 (IG1)	Always	Below 1 Ω
   4A-17 or G28-8 (IG1) - Body ground and other terminals	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  11

1. Inspect the ignition or starter switch assembly.

   Refer to INSPECTION [11/2018 - ]

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - IGNITION OR STARTER SWITCH ASSEMBLY) 

Result: 

NG 

REPLACE IGNITION OR STARTER SWITCH ASSEMBLY. Refer to  REMOVAL [11/2018 - ]