DTC P2511-149: HV CPU Power Relay Sense Circuit Intermittent No Continuity [12/2014 - ]: Procedure

1. Confirm whether the auxiliary battery terminals have been disconnected recently.

   Result

   Result	Proceed to
   Terminals have been disconnected.	A
   Terminals have not been disconnected.	B

B → See step   5 

A: Go to next step 

1. Turn the ignition switch to ON (READY) from off.
2. Confirm that the master warning light illuminates.

   Result

   Result	Proceed to
   Master warning light illuminates.	A
   Master warning light does not illuminates.	B

   HINT: 

   DTC P2511-149 may be stored after disconnecting and reconnecting the auxiliary battery terminals. If this happens, the DTC will not be output if the ignition switch is turned off and then on (READY) again. In this case, clear DTCs to complete the inspection.

3. Turn the ignition switch off.

B → END 

A: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON (IG).
3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
4. Read and record the DTCs and freeze frame data.
5. Clear the DTCs and freeze frame data.
6. Turn the ignition switch off.

NEXT: Go to next step 

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON (IG).
3. Enter the following menus: Powertrain / Hybrid Control / Trouble Codes.
4. Check if DTCs are output.

   Result

   Result	Proceed to
   DTC P2511-149 is output again.	A
   DTCs other than P2511-149 are also output.	B

5. Turn the ignition switch off.

B → See step   10 

A: Go to next step 

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 relay from the No. 2 engine room relay block and No. 2 junction block assembly.
2. Disconnect connectors A38 and A39 from hybrid vehicle control ECU.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

   *1	No. 2 Engine Room Relay Block and No. 2 Junction Block Assembly	*2	IGCT Relay
   *a	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
   A39-4 (+B1) - 5 (IGCT relay)	Ignition switch off	Below 1 Ω
   A38-1 (+B2) - 5 (IGCT relay)	Ignition switch off	Below 1 Ω

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

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Check for intermittent problems. Refer to CHECK FOR INTERMITTENT PROBLEMS [12/2014 - ] .
   1. Check the connection and terminal contact pressure of connectors and wire harnesses between the hybrid vehicle control ECU and the No. 2 engine room relay block and No. 2 junction block assembly.
   2. When the ignition switch to ON (READY), jiggle the connectors and wire harnesses between the hybrid vehicle control ECU and the No. 2 engine room relay block and No. 2 junction block assembly.

      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   9