Toyota Tacoma (2015-2018) Service Manual: Detecting Vehicle Submersion (B2277)

Toyota Tacoma (2015-2018) Service Manual / 2gr-fks Starting / Smart Key System(for Start Function) / Detecting Vehicle Submersion (B2277)

DESCRIPTION

This DTC is stored when a malfunction in the water submersion detection circuit in the certification ECU (smart key ECU assembly) is detected.

HINT:

When the cable is disconnected and reconnected to the negative (-) battery terminal, the power source mode returns to the state it was in before the cable was disconnected.

DTC Code	DTC Detection Condition	Trouble Area	DTC Output Confirmation Operation
B2277	The water submersion detection circuit in the certification ECU (smart key ECU assembly) detects water submersion (1- trip detection logic*).	Submersion of certification ECU (smart key ECU assembly) in water Certification ECU (smart key ECU assembly)	Wait 300 seconds after connecting the cable to the negative (-) battery terminal.

*: Only detected while a malfunction is present.

Vehicle Condition and Fail-safe Function when Malfunction Detected

Vehicle Condition when Malfunction Detected	Fail-safe Function when Malfunction Detected
The engine switch cannot be turned off and the engine cannot be started.	-

CAUTION / NOTICE / HINT

NOTICE:

When using the Techstream with the engine switch off, connect the Techstream to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Key. While using the Techstream, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the Techstream and the vehicle.
The smart key system (for Start Function) uses a multiplex communication system (LIN communication system) and the CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting.
Click here

Troubleshoot the smart key system (for Start Function) after confirming that the communication systems are functioning properly.
Before replacing the certification ECU (smart key ECU assembly), refer to the smart key system (for Start Function) precaution (See page ).
After performing repairs, perform the operation that fulfills the DTC output confirmation operation, and then confirm that no DTCs are output again.

Related Data List and Active Test Items

DTC	Data List Item	Active Test Item
B2277	-	-

HINT:

Before proceeding with troubleshooting, check if there are any signs of water damage to the certification ECU (smart key ECU assembly). If there are any signs of water damage, replace the certification ECU (smart key ECU assembly) and take measures against the cause of the water damage.

PROCEDURE

1.	CHECK WATER INTRUSION

(a) Check that the certification ECU (smart key ECU assembly), its surrounding area and wire harnesses have no signs of water intrusion.

Result

Result	Proceed to
No sign of water intrusion found	A
Signs of water intrusion found	B

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

TAKE MEASURES FOR WATER INTRUSION AND REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

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Diagnostic Trouble Code Chart
DIAGNOSTIC TROUBLE CODE CHART HINT: If a trouble code is output during the DTC check, inspect the trouble areas listed for that code. For details of the code, refer to the "See page" below. Certification ECU (Smart Key ECU Assembly) DTC Code Detection Item ...

Definition Of Terms
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