DTC B2281: "P" Signal Malfunction [08/2013 - ]: Procedure

1. Use the Data List to check if the shift position signal is functioning properly.
   MAIN BODY
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   Shift P Signal	Shift P position signal/ON or OFF	ON: Shift lever in P OFF: Shift lever not in P	-

   RESULT
   
   

   Result	Proceed to
   Display on the Techstream does not change according to shift lever operation	A
   Display on the Techstream changes according to shift lever operation	B

B → REPLACE MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH) 

A: Go to next step 

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the E4 main body ECU connector.
2. Disconnect the E51 shift lock control ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E4-2 (P) - E51-11 (P2)	Always	Below 1 Ω
   E51-3 (E) - Body ground	Always	Below 1 Ω
   E4-2 (P) or E51-11 (P2) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Check the signal waveform according to the condition(s) in the table below.
   REFERENCE
   
   

   Terminal No. (Symbol)	Tool Setting	Condition
   E51-11 (P2) - E51-3 (E)	2 V/DIV., 20 msec./DIV.	Shift lever in P

   OK

   The waveform is similar to that shown in the illustration.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

NG → See step   4 

OK → REPLACE MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)