DTC P0ADD-11: Hybrid/EV Battery Negative Contactor Circuit Short To Ground: Notes

1. - 

Outline of diagnosis: 

Short circuit to ground of system main relay SMRG system

Defective circuit on primary side of SMR (-)

(2 trip detection logic)

Trouble symptom: 

Hybrid system stopped

Wiring diagram: 

Hybrid system Ref. to WIRING SYSTEM (CROSSTREK MODEL (HEV))>HYBRID ELECTRIC VEHICLE SYSTEM>WIRING DIAGRAM .

Courtesy of SUBARU OF AMERICA, INC.

Courtesy of SUBARU OF AMERICA, INC.

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK Wire harness AND CONNECTOR (Hybrid vehicle control ECU assembly - CHASSIS GROUND)  .
   1. Disconnect Hybrid vehicle control ECU assembly connector (i369).
   2. Using a tester, measure the resistance between Hybrid vehicle control ECU assembly connector and chassis ground.

      Connector & terminal 

      (i369) No. 1 - Chassis ground:

   Is the resistance 20.6 - 40.8 Ω?

   Yes  : Replace Hybrid vehicle control ECU assembly. Ref. to HYBRID ELECTRIC VEHICLE>HYBRID POWERTRAIN CONTROL MODULE .

   No  : Go to  2.

2. CHECK CONNECTION CONDITION OF CONNECTOR (Rear harness LH CONNECTOR)  .

   Check the connecting condition of connector (R467) in Rear harness LH and check the relevant terminals for contact pressure, deformation and intrusion of water or foreign matter.

   Is there looseness at the connector mating, or any poor contact, deformation or intrusion of water or foreign matter at the relevant terminals?

   Yes  : Connect the connector securely. Or repair the poor contact of connector.

   No  : Go to  3.

3. CHECK CONNECTION CONDITION OF CONNECTOR (Rear harness LH CONNECTOR)  .

   Check the connecting condition of connector (R534) in Rear harness LH and check the relevant terminals for contact pressure, deformation and intrusion of water or foreign matter.

   Is there looseness at the connector mating, or any poor contact, deformation or intrusion of water or foreign matter at the relevant terminals?

   Yes  : Connect the connector securely. Or repair the poor contact of connector.

   No  : Go to  4.

4. CHECK Wire harness AND CONNECTOR (Hybrid vehicle control ECU assembly - HV battery junction block) (SHORT TO GROUND OR LINE-TO-LINE SHORT)  .
   CAUTION: Make sure to wear insulated gloves and protective goggles during the work.
   1. Check that the Service plug is disconnected. Ref. to HYBRID ELECTRIC VEHICLE>SERVICE PLUG .
   2. Disconnect HV battery junction block connector (HV51).
   3. Using a tester, measure the resistance between terminals in Hybrid vehicle control ECU assembly connector, and between Hybrid vehicle control ECU assembly connector and chassis ground.

      Connector & terminal 

      (i369) No. 1 - (i369) No. 1 - 35:

      (i369) No. 1 - Chassis ground:

   Is the resistance 10 kΩ or more?

   Yes  : Replace HV battery junction block. Ref. to HYBRID ELECTRIC VEHICLE>RELAY AND FUSE .

   No  : Repair or replace the Wire harness between Hybrid vehicle control ECU assembly connector and HV battery junction block connector.