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 

1. Check the connections of the hybrid vehicle control ECU connectors.

   OK

   The connectors are connected securely and there are no contact problems.

NG → CONNECT SECURELY 

OK: Go to next step 

1. Turn the power switch off.
2. Remove the IGCT2 relay from the engine room No. 2 relay block.
3. Disconnect connector A76 from the hybrid vehicle control ECU.
   Fig 1: Checking Harness And Connector (Hybrid Vehicle Control ECU - IGCT2 Relay)

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

   Standard resistance

   Tester Connection	Switch Condition	Specified Condition
   A76-2 (+B2) - Engine room No. 2 relay block IGCT2 relay terminal 3	Power switch off	Below 1 Ω
   A76-1 (+B1) - Engine room No. 2 relay block IGCT2 relay terminal 3	Power switch off	Below 1 Ω

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 No. 2 relay block.
   2. When the power switch is on (READY), jiggle the connectors and wire harnesses between the hybrid vehicle control ECU and the engine room No. 2 relay block.

NG → REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA 

OK → See step   5