DTC P2511-149: ECM/PCM Power Relay Sense Circuit Intermittent: Procedure

1. Check the connection of the auxiliary battery terminal.

   OK

   The terminal is connected securely and there is no contact problem.

NG → CONNECT SECURELY 

OK: Go to next step 

NG → CONNECT SECURELY 

OK: Go to next step 

1. Remove the IGCT MAIN relay from the engine room relay block No. 2.
2. Disconnect connectors A65 and A66 from the hybrid vehicle control ECU.
   Fig 1: Checking Harness And Connector (Hybrid Vehicle Control ECU - IGCT Main Relay)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *a	Component without IGCT MAIN relay connected (Engine Room Relay Block No. 2)
   *b	Rear view of wire harness connector (to Hybrid Vehicle Control ECU)

3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   A66-5 (+B1) - 3 (IGCT MAIN relay)	Ignition switch off	Below 1 Ω
   A65-2 (+B2) - 3 (IGCT MAIN relay)	Ignition switch off	Below 1 Ω

4. Install the IGCT MAIN relay.
5. Connect the hybrid vehicle control ECU connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Check for intermittent problems. Refer to CHECK FOR INTERMITTENT PROBLEMS .
   1. Check the connection and terminal contact pressure of connectors and wire harnesses between the hybrid vehicle control ECU and the engine room relay block No. 2.
   2. When the ignition switch is ON (READY), jiggle the connectors and wire harnesses between the hybrid vehicle control ECU and the engine room relay block No. 2.

      Result

      Result	Proceed to
      Problem symptom does not recur.	A
      Problem symptom recurs.	B

B → REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA 

A → See step   5