DTC B2278-62: Engine/Power Switch Signal Compare Failure [12/2021 - ]: 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	Engine switch 1 status	OFF or ON	OFF: Engine switch not pressed ON: Engine switch pressed	If the engine switch is pressed for a short time, the display may not change. Use this item to determine if the engine switch input signal is malfunctioning.
   Push Start Switch 2	Engine switch 2 status	OFF or ON	OFF: Engine switch not pressed ON: Engine switch pressed	If the engine switch is pressed for a short time, the display may not change. Use this item to determine if the engine switch input signal is malfunctioning.
   Push Start Switch 3	Engine switch 3 status	OFF or ON	OFF: Engine switch not pressed ON: Engine switch pressed	If the engine switch is pressed for a short time, the display may not change. Use this item to determine if the engine 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 engine 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	Engine switch 1 status	OFF or ON	OFF: Engine switch not pressed ON: Engine switch pressed	If the engine switch is pressed for a short time, the display may not change. Use this item to determine if the engine switch input signal is malfunctioning.
   Push Start Switch 2	Engine switch 2 status	OFF or ON	OFF: Engine switch not pressed ON: Engine switch pressed	If the engine switch is pressed for a short time, the display may not change. Use this item to determine if the engine switch input signal is malfunctioning.
   Push Start Switch 3	Engine switch 3 status	OFF or ON	OFF: Engine switch not pressed ON: Engine switch pressed	If the engine switch is pressed for a short time, the display may not change. Use this item to determine if the engine 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 engine switch operation.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPAIR OR REPLACE HARNESS OR CONNECTOR IN CIRCUIT CONNECTED TO POWER SOURCE 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Pre-procedure1

1. Disconnect the I39 certification ECU (smart key ECU assembly) connector.
2. Disconnect the I75 engine switch connector.

   Procedure1

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   I39-19 (SSW1) - I75-12 (SS1)	Always	Below 1 Ω
   I39-27 (SSW2) - I75-6 (SS2)	Always	Below 1 Ω
   I39-23 (SSW3) - I75-11 (SS3)	Always	Below 1 Ω
   I39-30 (AGND) - I75-3 (GND)	Always	Below 1 Ω
   I39-19 (SSW1) or I75-12 (SS1) - Other terminals and body ground	Always	10 kΩ or higher
   I39-27 (SSW2) or I75-6 (SS2) - Other terminals and body ground	Always	10 kΩ or higher
   I39-23 (SSW3) or I75-11 (SS3) - Other terminals and body ground	Always	10 kΩ or higher
   I39-30 (AGND) or I75-3 (GND) - Other terminals and 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  4

Refer to INSPECTION [12/2021 - ]

Result

Result: 

OK 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [12/2021 - ] 

Result: 

NG 

REPLACE ENGINE SWITCH. Refer to  REMOVAL [12/2021 - ]