DTC B228A: Engine Speed Signal Circuit; DTC P0335: Crankshaft Position Sensor Circuit Malfunction (NE Signal) [03/2017 - ]: 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 or Starting Control / Data List.
5. Read the Data List according to the display on the Techstream.

   Body Electrical > Power Source Control > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Engine Condition	Engine state	Stop or Run	Stop: Engine stopped Run: Engine running	-

   Body Electrical > Power Source Control > Data List 

   Tester Display
   Engine Condition

   Body Electrical > Starting Control > Data List 

   Tester Display	Measurement Item	Range	Normal Condition	Diagnostic Note
   Engine Speed	Engine speed	0 to 16383 rpm	Fluctuates in accordance with actual engine speed	-

   Body Electrical > Starting Control > Data List 

   Tester Display
   Engine Speed

   OK

   The Techstream display changes correctly in response to the engine condition.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE ECM. Refer to  REMOVAL [03/2017 - 05/2023]  , or refer to  REMOVAL [05/2023 - ] 

Result: 

NG 

See step  2

1. Disconnect the A20 certification ECU (smart key ECU assembly) connector.
2. Disconnect the A58 ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   A20-16 (NE) - A58-30 (NEO)	Always	Below 1 Ω
   A20-16 (NE) or A58-30 (NEO) - Other terminals and body ground	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Connect the A20 certification ECU (smart key ECU assembly) connector.
2. Connect the A58 ECM connector.
3. Using an oscilloscope, check the engine speed input signal waveform at the terminal of the certification ECU (smart key ECU assembly).

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

   OK

   Tester Connection	Condition	Specified Condition
   A20-16 (NE) - Body ground	Engine stopped	No pulse generation
   	Engine running	Pulse generation

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to  REMOVAL [03/2017 - 05/2023]  , or refer to  REMOVAL [05/2023 - ] 

Result: 

NG 

REPLACE ECM. Refer to  REMOVAL [03/2017 - 05/2023]  , or refer to  REMOVAL [05/2023 - ]