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

1. Check the connection of the auxiliary battery terminal.

   Result

   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.
   Fig 1: Checking Connector Connection Condition (HV Control ECU Connector)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Result

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

NG → CONNECT SECURELY 

OK: Go to next step 

1. Remove the integration relay from the engine room R/B No. 1.
   Fig 2: Identifying Integration Relay From Engine Room R/B No. 1

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

   Standard resistance

   Tester Connection	Specified Condition
   +B1 (A54-46) - 1V-8	Below 1 Ω
   +B2 (A54-23) - 1V-8	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 R/B No. 1.
   2. When the power switch is on (READY), jiggle the connectors and wire harnesses between the hybrid vehicle control ECU and the engine room R/B No. 1.

NG → REPAIR MALFUNCTIONING PARTS, COMPONENT AND AREA 

OK → See step   5