DTC B2281: "P" Signal Malfunction: Procedure

1. Connect Techstream to the DLC3.
2. Turn the engine switch on (IG) and turn Techstream main switch on.
3. Read the DATA LIST according to the displays on the tester.
   MAIN BODY:
   
   

   Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
   SHIFT P SIG	Shift P Signal / ON or OFF	ON: Shift P signal ON (Shift position is P) OFF: Shift P signal OFF (Shift position is not P)	-

   OK

   "ON" (P signal is ON) and "OFF" (P signal is OFF) appear on the screen.

NG → GO TO SHIFT CONTROL SYSTEM 

OK: Go to next step 

1. Disconnect the D10 and D21 ECU connectors.
   Fig 1: Identifying D10 And D21 ECU Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard resistance

   Terminal No. (Symbol)	Condition	Specified Condition
   D10-2 (P) - D21-11 (P2)	Always	Below 1 Ω
   D10-2 (P) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. After replacing the main body ECU (instrument panel junction block) with a normally functioning ECU, check that the engine can start normally.

   OK

   Engine can start normally.

NG → See step   4 

OK → END (MAIN BODY ECU DEFECTIVE)