DTC P0A93-00: Inverter "A" Cooling System Performance: Notes

1. - 

Outline of diagnosis: 

The inverter coolant temperature rises, and temperature at any portion related to the inverter rises at the same time

Actual inverter coolant temperature is higher than the sensor value by a predetermined value or more, and also the actual value is high

(1 trip detection logic)

Trouble symptom: 

• Greatly reduced output power
• A driving range is limited

Courtesy of SUBARU OF AMERICA, INC.

1. CHECK DTC  .

   Read the following DTCs using Subaru Select Monitor. Ref. to P-HEV HYBRID POWERTRAIN CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) . Ref. to P-HEV DRIVE MOTOR (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) . Ref. to ENGINE (DIAGNOSTICS) (H4DO (HEV))>DIAGNOSTIC TROUBLE CODE (DTC) .

   • P-HEV Hybrid Powertrain Control
   • P-HEV Drive Motor
   • Engine Control System
   NOTE:

   Malfunction contents	System	Related DTC
   Insulation malfunction	P-HEV Hybrid Powertrain Control	P1C7C49	HYBRID/EV BATTERY VOLTAGE SYSTEM ISOLATION (A/C AREA) INTERNAL ELECTRONIC FAILURE
   		P1C7D49	HYBRID/EV BATTERY VOLTAGE SYSTEM ISOLATION (HYBRID/EV BATTERY AREA) INTERNAL ELECTRONIC FAILURE
   		P1C7E49	HYBRID/EV BATTERY VOLTAGE SYSTEM ISOLATION (TRANSAXLE AREA) INTERNAL ELECTRONIC FAILURE
   		P1C7F49	HYBRID/EV BATTERY VOLTAGE SYSTEM ISOLATION (DIRECT CURRENT AREA) INTERNAL ELECTRONIC FAILURE
   Sensor and actuator circuit malfunction	P-HEV Hybrid Powertrain Control	P0C7396	MOTOR ELECTRONICS COOLANT PUMP "A" COMPONENT INTERNAL FAILURE
   		P314A31	MOTOR ELECTRONICS COOLANT PUMP "A" NO SIGNAL
   	P-HEV Drive Motor	P0A0011	MOTOR ELECTRONICS COOLANT TEMPERATURE SENSOR CIRCUIT SHORT TO GROUND
   		P0A0015	MOTOR ELECTRONICS COOLANT TEMPERATURE SENSOR CIRCUIT SHORT TO BATTERY OR OPEN
   System malfunction	Engine	P059F	ACTIVE GRILLE AIR SHUTTER "A" PERFORMANCE/STUCK OFF
   		P05A0	ACTIVE GRILLE AIR SHUTTER "A" STUCK ON
   		P05A1	ACTIVE GRILLE AIR SHUTTER "A" POSITION SENSOR MINIMUM/MAXIMUM STOP PERFORMANCE
   		P059A	ACTIVE GRILLE AIR SHUTTER "A" POSITION SENSOR CIRCUIT
   		P05A2	ACTIVE GRILLE AIR SHUTTER "A" CONTROL CIRCUIT/OPEN
   		U0077	LIN COMMUNICATION BUS "ECM/PCM" OFF
   		U0284	LOST COMMUNICATION WITH ACTIVE GRILLE SHUTTER MODULE "A"

   When "Only DTC P0A9300 is displayed" or "DTC other than above is displayed", go to  A.

   When DTCs related to [P-HEV Hybrid Powertrain Control] mentioned above are simultaneously displayed, go to  B.

   When DTCs related to [P-HEV Drive Motor] mentioned above are simultaneously displayed, go to  C.

   When DTCs related to [Engine Control System] mentioned above are simultaneously displayed, go to  D.

   Yes  :

   1. Go to  2.
   2. Perform the diagnosis for the simultaneously displayed DTCs.
      NOTE: If more than one DTC is simultaneously displayed, perform the diagnosis in the order described in the above.
   3. Perform the diagnosis for the simultaneously displayed DTCs.
      NOTE: If more than one DTC is simultaneously displayed, perform the diagnosis in the order described in the above.
   4. Perform the diagnosis for the simultaneously displayed DTCs.
   NOTE: If more than one DTC is simultaneously displayed, perform the diagnosis in the order described in the above.

   No  : -

2. CHECK CONNECTION CONDITION OF CONNECTOR (Inverter with converter assembly LOW PRESSURE CONNECTOR)  .
   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. Check the connecting condition of connectors (HV23) and (HV24) in Inverter with converter assembly and check the relevant terminals for contact pressure, deformation and intrusion of water and foreign matter. Ref. to HYBRID ELECTRIC VEHICLE>INVERTER AND CONVERTER ASSEMBLY .
      NOTE: To connect the connector, insert to the end with the lock lever raised, then fold the lock lever completely until a click is heard. After connected, make sure that the lock claw does not loosen and pull the connector to see that it does not come off.

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

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

   No  : Go to  3.

3. CHECK Cooling System  .

   Check Cooling System. Ref. to P-HEV HYBRID POWERTRAIN CONTROL (DIAGNOSTICS)>DIAGNOSTICS WITH PHENOMENON>INSPECTION>COOLING SYSTEM .

   Is the Cooling System OK?

   Yes  : Replace the coolant. Ref. to COOLING (H4DO (HEV))>ENGINE COOLANT .

   No  : Repair according to Cooling System inspection. Ref. to P-HEV HYBRID POWERTRAIN CONTROL (DIAGNOSTICS)>DIAGNOSTICS WITH PHENOMENON>INSPECTION>COOLING SYSTEM .