DTC B2271 Ignition Hold Monitor Malfunction: Wiring Diagram

1. Delete the DTC (See DIAGNOSIS SYSTEM  ).

   HINT:

   After all DTCs are cleared, check if the trouble occurs again 6 seconds after the engine switch is turned on (IG).

2. Check for DTCs again.

   OK: No DTC is output. 

   Result 

   RESULT CHART
   
   

   Result	Proceed to
   OK (When troubleshooting according to the DTC Chart)	A
   OK (When troubleshooting according to the PROBLEM SYMPTOMS TABLE)	B
   NG	C

B : PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

C : Go to step 2 

A : CHECK INTERMITTENT PROBLEMS 

1. Remove the AM2 fuse from the cowl side J/B RH.
2. Measure the resistance of the fuse.

   Standard resistance: Below 1 Ω 

3. CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BATTERY AND BODY GROUND) 
   1. Disconnect the J55 ECU connector.
   2. Measure the voltage and resistance of the wire harness side connector.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION CHART
      
      

      Tester Connection (Symbols)	Specified Condition
      J55-33 (AM1) - Body ground	10 to 14 V
      J55-12 (AM2) - Body ground	10 to 14 V

   Standard resistance 

   TESTER CONNECTION SPECIFIED CONDITION CHART
   
   

   Tester Connection (Symbols)	Specified Condition
   J55-6 (GND2) - Body ground	Below 1 Ω

   Fig 2: Identifying J55 Power Source Control ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK : REPLACE POWER SOURCE CONTROL ECU 

NG : GO TO NEXT STEP 

REPAIR OR REPLACE HARNESS OR CONNECTOR