DTC B2278-62: Engine/Power Switch Signal Compare Failure [11/2021 - ]: Procedure

1. Read the Data List according to the display on the GTS.

   Body Electrical > Power Source Control > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Push Start Switch 1	Power switch 1 status	OFF or ON	OFF: Power switch not pressed ON: Power switch pressed	If the power switch is pressed for a short time, the display may not change. Use this item to determine if the power switch input signal is malfunctioning.
   Push Start Switch 2	Power switch 2 status	OFF or ON	OFF: Power switch not pressed ON: Power switch pressed	If the power switch is pressed for a short time, the display may not change. Use this item to determine if the power switch input signal is malfunctioning.
   Push Start Switch 3	Power switch 3 status	OFF or ON	OFF: Power switch not pressed ON: Power switch pressed	If the power switch is pressed for a short time, the display may not change. Use this item to determine if the power switch input signal is malfunctioning.

   Body Electrical > Power Source Control > Data List 

   Tester Display
   Push Start Switch 1
   Push Start Switch 2
   Push Start Switch 3

   OK

   The GTS display changes correctly in response to the power switch operation.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  3

Result: 

OK 

See step  2

1. According to the display on the GTS, read the Data List while wiggling the wire harness.

   Body Electrical > Power Source Control > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Push Start Switch 1	Power switch 1 status	OFF or ON	OFF: Power switch not pressed ON: Power switch pressed	If the power switch is pressed for a short time, the display may not change. Use this item to determine if the power switch input signal is malfunctioning.
   Push Start Switch 2	Power switch 2 status	OFF or ON	OFF: Power switch not pressed ON: Power switch pressed	If the power switch is pressed for a short time, the display may not change. Use this item to determine if the power switch input signal is malfunctioning.
   Push Start Switch 3	Power switch 3 status	OFF or ON	OFF: Power switch not pressed ON: Power switch pressed	If the power switch is pressed for a short time, the display may not change. Use this item to determine if the power switch input signal is malfunctioning.

   Body Electrical > Power Source Control > Data List 

   Tester Display
   Push Start Switch 1
   Push Start Switch 2
   Push Start Switch 3

   OK

   The GTS display changes correctly in response to the power switch operation.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

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

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Disconnect the D58 certification ECU (smart key ECU assembly) connector.
2. Disconnect the D60 power switch connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D58-19 (SSW1) - D60-12 (SS1)	Always	Below 1 Ω
   D58-27 (SSW2) - D60-6 (SS2)	Always	Below 1 Ω
   D58-23 (SSW3) - D60-11 (SS3)	Always	Below 1 Ω
   D58-30 (AGND) - D60-3 (AGND)	Always	Below 1 Ω
   D58-19 (SSW1) or D60-12 (SS1) - Other terminals and body ground	Always	10 kΩ or higher
   D58-27 (SSW2) or D60-6 (SS2) - Other terminals and body ground	Always	10 kΩ or higher
   D58-23 (SSW3) or D60-11 (SS3) - Other terminals and body ground	Always	10 kΩ or higher
   D58-30 (AGND) or D60-3 (AGND) - Other terminals and body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

Refer to INSPECTION [11/2021 - ]

Result

Result: 

OK 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [11/2021 - ] 

Result: 

NG 

REPLACE POWER SWITCH. Refer to  REMOVAL [11/2021 - ]