DTC B227B: Push Engine Switch Input Performance [11/2021 - ]: Procedure

1. Turn the ignition switch to ON.
2. Using the GTS, perform the clear DTCs of [Keyless Access with Push Button Start(Power Supply)].
3. Press the engine switch to perform OFF → ACC ON → IGN ON respectively for one minute.
4. Turn the ignition switch to OFF.
5. Disconnect the connector from the smart key ECU assembly and reconnect it.
6. Turn the ignition switch to ON.
7. Read the DTC of [Keyless Access with Push Button Start(Power Supply)] using the GTS.

   Is DTC B227B displayed? (Current code)

   Result	Proceed to
   Yes	A
   No (Even if DTC is displayed, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.) HINT:  In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.	B

Result: 

B 

END 

1. Even if DTC is displayed, the circuit has returned to a normal condition at this time.
2. Reproduce the failure, and then perform the diagnosis again.

   HINT: 

   In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.

Result: 

A 

See step  2

1. Turn the ignition switch to OFF.
2. Disconnect the connector from the engine switch.
3. Disconnect the connector from the smart key ECU assembly.
4. Using a tester, measure the resistance between the engine switch connector and the smart key ECU assembly connector and chassis ground.

   Connector & terminal

   F20-1 - F8-9 (SWW2)

   F20-5 - F8-8 (SWW1)

   F20-6 - F9-24 (AGND)

   Is the resistance less than 1 Ω?

   Result	Proceed to
   Yes	A
   No (Repair or replace the open circuit of harness.)	B

Result: 

B 

REPAIR OR REPLACE THE OPEN CIRCUIT OF HARNESS 

Result: 

A 

See step  3

1. Perform individual inspection of the engine switch.

   Refer to INSPECTION [11/2021 - ]

   Is the check result OK?

   Result	Proceed to
   Yes	A
   No (Replace the engine switch.)	B

Result: 

B 

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

Result: 

A 

See step  4

1. Connect the disconnected connectors.
2. Turn the ignition switch to ON.
3. Using the GTS, check the following items in the [Data Monitor] of [Keyless Access with Push Button Start(Power Supply)].

   Refer to DATA LIST / ACTIVE TEST [11/2021 - ]

   • Push start SW 1
   • Push start SW 2

   Is it turned [ON] when pressing the engine switch?

   Result	Proceed to
   Yes (Even if DTC is displayed, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.) HINT:  In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.	A
   No (Replace the smart key ECU assembly.)	B

Result: 

A 

END 

1. Even if DTC is displayed, the circuit has returned to a normal condition at this time.
2. Reproduce the failure, and then perform the diagnosis again.

   HINT: 

   In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.

Result: 

B 

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