Toyota Tacoma manuals

Toyota Tacoma 2015-2018 Service Manual: Runnable Signal Malfunction (B2286,P0335)

DESCRIPTION

These DTCs are stored when the engine speed signal sent by the ECM via direct line and the engine speed signal sent via CAN communication do not match.

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

B2286

The engine speed signal sent by the ECM via direct line and the engine speed signal sent via CAN communication (1- trip detection logic*) do not match.

  • AM2 NO. 2 fuse
  • SFI system
  • Certification ECU (smart key ECU assembly)
  • Wire harness or connector

Disconnect the cable from the negative (-) battery terminal, wait 30 seconds and reconnect the cable to the negative (-) battery terminal. Wait 20 seconds or more with the engine switch off, then start the engine and maintain an engine speed of 1000 rpm or more for 20 seconds or more.

P0335

The engine speed signal sent by the ECM via direct line and the engine speed signal sent via CAN communication (1- trip detection logic*) do not match.

  • AM2 NO. 2 fuse
  • SFI system
  • Certification ECU (smart key ECU assembly)
  • Wire harness or connector

Allow the engine to idle for 10 seconds or more.

  • *: Only detected while a malfunction is present and the engine switch is on (IG)
Vehicle Condition and Fail-safe Function when Malfunction Detected

Vehicle Condition when Malfunction Detected

Fail-safe Function when Malfunction Detected

  • When the signal sent via either the direct line or CAN communication is malfunctioning and indicates no vehicle speed, there is no effect on vehicle behavior. (A malfunction is detected after the engine switch is turned on (IG).)
  • When the signal sent via either direct line or CAN communication is malfunctioning and indicates that the vehicle is moving, the engine cannot be started. However, the engine can be started after the engine switch has been turned off.
  • When the signal sent via either direct line or CAN communication is malfunctioning and indicates no vehicle speed, there is no effect on vehicle behavior.
  • When the signal sent via either direct line or CAN communication is malfunctioning and indicates that the vehicle is moving:
    • If the following conditions are met, it is determined that the malfunction is not in CAN communication but in the direct line (NE).
      • When the engine switch is pressed, the system controls the engine based on the starter OFF permission flag (perfect injection signal judgment) via CAN communication, causing the engine to stop cranking.
      • When the engine switch is pressed and held, the system controls the engine based on the engine speed signal via CAN communication, causing the engine to stop cranking.
    • If the following conditions are met, it is determined that the malfunction is not in the direct line (NE) but in CAN communication.
      • When the engine switch is pressed, the system controls the engine based on the engine speed signal via direct line, causing the engine to stop cranking.
      • When the engine switch is pressed and held, the system controls the engine based on the engine speed signal via direct line, causing the engine to stop cranking.
    • If the following conditions are met, it is determined that there is a malfunction in both CAN communication and the direct line (NE).
      • When the engine switch is pressed, the engine stops cranking after 6 seconds.
      • When the engine switch is pressed and held, the engine remains cranking for up to 30 seconds.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

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

    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 Inspect the fuses of circuits related to this system before performing ).
  • Inspect the fuses of circuits related to this system before performing the following inspection procedure.
  • 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

B2286

P0335

Power Source Control
  • Engine Condition
Starting Control
  • Engine Speed

-

PROCEDURE

1.

READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Power Source Control or Starting Control / Data List.

(e) According to the display on the Techstream, read the Data List.

Power Source Control

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Engine Condition

Engine state/Stop or Run

Stop: Engine stopped

Run: Engine running

-

Starting Control

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Engine Speed

Engine speed/0 to 16383 r/min

Fluctuates in accordance with engine speed

-

OK:

The Data List item changes in accordance with the engine condition.

NG

GO TO SFI SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

OK

2.

CHECK HARNESS AND CONNECTOR (POWER SOURCE)

NG

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

OK

3.

CHECK HARNESS AND CONNECTOR (GROUND)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECUASSEMBLY) - ECM)

(a) Disconnect the C27 certification ECU (smart key ECU assembly) connector.

(b) Disconnect the E14 ECM connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

C27-14 (NE) - E14-15 (NEO)

Always

Below 1 Ω

C27-14 (NE) - E14-15 (NEO) - Body ground

Always

10 kΩ or higher

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(a) Reconnect the C27 certification ECU (smart key ECU assembly) connector.

(b) Reconnect the E14 ECM connector.

(c) Using an oscilloscope, check the engine speed input signal waveform at the terminal of the certification ECU (smart key ECU assembly).

Standard Frequency:

Tester Connection

Condition

Specified Condition

C27-14 (NE) - Body ground

Engine stopped

No pulse generated

Engine running

Pulse generated

Text in Illustration

*a

Component with harness connected

(Certification ECU (Smart Key ECU Assembly))

OK

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

NG

GO TO SFI SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING)

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