DTC B2286: Runnable Signal Malfunction: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the engine switch on (IG).
3. Turn the Techstream on.
4. Enter the following menus: Body Electrical / Power Source Control / Data List.
5. 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	Condition of engine / Stop or Run	Stop: Engine is stopped Run: Engine is running	-

6. Enter the following menus: Powertrain / Engine / Data List.
7. According to the display on the Techstream, read the Data List.
   ENGINE
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Engine Speed	Engine speed / 0 to 16383 r/min	Changes according to engine speed	-

   OK

   The Data List items change in accordance with the engine condition.

   RESULT
   
   

   Result	Proceed to
   NG	A
   OK	B

B → See step   7 

A: Go to next step 

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

OK: Go to next step 

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the D48 certification ECU (smart key ECU assembly) connector.
2. Disconnect the A35 ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   D48-17 (TACH) - A35-15 (TACH)	Always	Below 1 Ω
   D48-17 (TACH) or A35-15 (TACH) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Reconnect the A35 ECM connector.
2. Reconnect the D48 certification ECU (smart key ECU assembly) connector.
   Fig 1: Identifying D48 Certification ECU (Smart Key ECU Assembly) Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Check the signal waveform according to the condition(s) in the table below.

   OK

   Tester Connection	Condition	Specified Condition
   D48-17 (TACH) - Body ground	Engine is stopped	No pulse generated
   	Engine is running	Pulse generated

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Certification ECU (Smart Key ECU Assembly))

NG → See step   7 

OK → See step   6