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DTC P0A90: Drive Motor "A" Performance: Wiring Diagram

WARNING: This page is about a different car, the 2015 Subaru XV Crosstrek. However, it is still accessible from the selected car via links, so may be relevant.

Hybrid system < Ref. to WIRING DIAGRAM , Hybrid Electric Vehicle System.>

Fig 1: Drive Motor A Performance - Wiring Diagram
G09479249Courtesy of SUBARU OF AMERICA, INC.
DTC PROCEDURE

Step Check Yes No
1 CHECK DTC. 
Read the DTC. < Ref. to DRIVE MOTOR CONTROL SYSTEM , OPERATION, Read Diagnostic Trouble Code (DTC).>		 Are DTCs (relating to current sensors, speed sensors) detected? (current malfunction) Perform the diagnosis according to DTC. < Ref. to DRIVE MOTOR CONTROL SYSTEM , LIST, List of Diagnostic Trouble Code (DTC).> Go to step 2  .
2 CHECK CURRENT DATA. 
Using the Subaru Select Monitor, confirm the current data of drive motor control system, the values of «Phase U Amperage Sensor Voltage »«Phase V Amperage Sensor Voltage »«Phase W Amperage Sensor Voltage». < Ref. to DRIVE MOTOR CONTROL SYSTEM , OPERATION, Read Current Data.>		 Is the value 2.5 V±0.1 V? Go to step 3  . Perform the diagnosis according to DTC P0BE6. < Ref. to DTC P0BE6 DRIVE MOTOR "A" PHASE U CURRENT SENSOR CIRCUIT RANGE/PERFORMANCE , Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
3 CHECK DRIVE MOTOR AND POWER CABLE (DEMAGNETIZATION, SHORT). 
  1. With the 12 V battery connected, remove the service disconnect plug. < Ref. to SERVICE PLUG .>
    CAUTION: Watch for an electrical short at each harness because the 12 V battery is connected.
  2. Lift up the vehicle.
  3. Start the engine, and set the shift lever to "D" range.
  4. Using the Subaru Select Monitor, confirm the current data of drive motor control system, the values of «A/T Oil Temperature»«Drive Motor Speed»«Drive Motor Inverter Input High Voltage Sensor (Serial)». < Ref. to DRIVE MOTOR CONTROL SYSTEM , OPERATION, Read Current Data.>
 Are any of the following statements relevant?
  • «Drive Motor Inverter Input High Voltage Sensor (Serial)» is out of the standard specified in Note when «ATF Temperature » is 20 - 60°C (68 - 140°F) and «Drive Motor Speed» is 600 - 1400 rpm.
  • Abnormal noise and changes in rotation speed occur near 600 rpm.
 If you have a milliohm tester at hand, Go to step 6  . If a milliohm tester is NOT at hand, Go to step 11  . If you have a milliohm tester at hand, Go to step 4  . If a milliohm tester is NOT at hand, Go to step 10  .
4 CHECK DRIVE MOTOR AND POWER CABLE (SHORT). 
  1. Leave the vehicle under temperature of 40°C (104°F) or less for 10 minutes.
  2. Using the Subaru Select Monitor, confirm the current data of drive motor control system, the values of «Drive Motor Temperature A»«Drive Motor Temperature B» are 40°C (104°F) or less. < Ref. to DRIVE MOTOR CONTROL SYSTEM , OPERATION, Read Current Data.>
  3. Turn the ignition switch to OFF.
  4. Disconnect the ground cable of the 12 volt auxiliary battery, and as for the 12 volt engine restart battery, disconnect the ground cable from the 12V engine restart battery sensor. < Ref. to BATTERY , NOTE, Note.>
  5. Disconnect the power cable (HV2) of drive motor inverter.
  6. Using a milliohm tester, measure the resistance between power cable terminals.

    Connector & terminal 

    (HV2) U - (HV2) V: 

    (HV2) U - (HV2) W: 

    (HV2) V - (HV2) W: 

 Is either resistance value 25 mΩ or less? Go to step 5  . Replace the drive motor assembly. < Ref. to appropriate DRIVE MOTOR ASSEMBLY in Continuously Variable Transmission TH58A article.>
5 CHECK DRIVE MOTOR (SHORT). 
  1. Disconnect the drive motor power cable (HV1).
    NOTE: The gasket is NOT reusable.
  2. Using a milliohm tester, measure the resistance between power cable terminals.

    Connector & terminal 

    (HV1) U - (HV1) V: 

    (HV1) U - (HV1) W: 

    (HV1) V - (HV1) W: 

 Is either resistance value 20 mΩ or less? Replace the drive motor assembly. < Ref. to appropriate DRIVE MOTOR ASSEMBLY in Continuously Variable Transmission TH58A article.> Replace the power cable. < Ref. to POWER CABLE .> Go to step 16  .
6 CHECK BUS BAR. 
  1. Turn the ignition to OFF.
  2. Disconnect the ground cable of the 12 volt auxiliary battery, and as for the 12 volt engine restart battery, disconnect the ground cable from the 12V engine restart battery sensor. < Ref. to BATTERY , NOTE, Note.>
  3. Remove the service disconnect plug. < Ref. to SERVICE PLUG .>
  4. Wait for 10 minutes.
  5. Check the bus bar.
 Is the condition normal? (Check for loose bolts, insecure connection, foreign matter caught, trace of arc (burnt terminals) etc.) Go to step 7  . Retighten the bolts. Or replace the bus bar.
7 CHECK DRIVE MOTOR AND POWER CABLE. 
  1. Leave the vehicle under temperature of 40°C (104°F) or less for 10 minutes.
  2. Using the Subaru Select Monitor, confirm the current data of drive motor control system, the values of «Drive Motor Temperature A»«Drive Motor Temperature B» are 40°C (104°F) or less. < Ref. to DRIVE MOTOR CONTROL SYSTEM , OPERATION, Read Current Data.>
  3. Turn the ignition switch to OFF.
  4. Disconnect the ground cable of the 12 volt auxiliary battery, and as for the 12 volt engine restart battery, disconnect the ground cable from the 12V engine restart battery sensor. < Ref. to BATTERY , NOTE, Note.>
  5. Disconnect the power cable (HV2) of drive motor inverter.
  6. Using a milliohm tester, measure the resistance between power cable terminals.

    Connector & terminal 

    (HV2) U - (HV2) V: 

    (HV2) U - (HV2) W: 

    (HV2) V - (HV2) W: 

 Is either resistance value out of 25 - 80 mΩ range? Go to step 8  . Go to step 9  .
8 CHECK DRIVE MOTOR. 
  1. Disconnect the drive motor power cable (HV1).
    NOTE: The gasket is NOT reusable.
  2. Using a milliohm tester, measure the resistance between power cable terminals.

    Connector & terminal 

    (HV1) U - (HV1) V: 

    (HV1) U - (HV1) W: 

    (HV1) V - (HV1) W: 

 Is either resistance value out of 20 - 70 mΩ range? Replace the drive motor assembly. < Ref. to appropriate DRIVE MOTOR ASSEMBLY in Continuously Variable Transmission TH58A article.> Replace the power cable. < Ref. to POWER CABLE .> Go to step 16  .
9 CHECK DRIVE MOTOR INVERTER. 
  1. Replace the drive motor inverter. < Ref. to INVERTER .>
  2. Replace the removed/disconnected parts back to the vehicle.
  3. Perform drive cycle B. < Ref. to DRIVE CYCLE B , PROCEDURE, Drive Cycle.>
 Is the same DTC detected? (current malfunction) Replace DMCM. < Ref. to appropriate DRIVE MOTOR CONTROL MODULE in Continuously Variable Transmission TH58A article.> Problem is present in drive motor inverter.
10 CHECK POWER CABLE (SHORT). 
  1. Turn the ignition switch to OFF.
  2. Disconnect the ground cable of the 12 volt auxiliary battery, and as for the 12 volt engine restart battery, disconnect the ground cable from the 12V engine restart battery sensor. < Ref. to BATTERY , NOTE, Note.>
  3. Disconnect the power cable (HV2) of drive motor inverter.
  4. Using an insulation multimeter (250 V range), measure the resistance between power cable terminals.

    Connector & terminal 

    (HV2) U - (HV2) V: 

    (HV2) U - (HV2) W: 

    (HV2) V - (HV2) W: 

 Does the resistance between any points show 2 MΩ or more? Replace the drive motor assembly. < Ref. to appropriate DRIVE MOTOR ASSEMBLY in Continuously Variable Transmission TH58A article.> Replace the power cable. < Ref. to POWER CABLE .> Go to step 16  .
11 CHECK BUS BAR. 
Check the bus bar.		 Is the condition normal? (Check for loose bolts, insecure connection, foreign matter caught, trace of arc (burnt terminals) etc.) Go to step 12  . Retighten the bolts. Or replace the bus bar.
12 CHECK DRIVE MOTOR AND POWER CABLE. 
  1. Leave the vehicle under temperature of 40°C (104°F) or less for 10 minutes.
  2. Using the Subaru Select Monitor, confirm the current data of drive motor control system, the values of «Drive Motor Temperature A»«Drive Motor Temperature B» are 40°C (104°F) or less. < Ref. to DRIVE MOTOR CONTROL SYSTEM , OPERATION, Read Current Data.>
  3. Turn the ignition switch to OFF.
  4. Disconnect the ground cable of the 12 volt auxiliary battery, and as for the 12 volt engine restart battery, disconnect the ground cable from the 12V engine restart battery sensor. < Ref. to BATTERY , NOTE, Note.>
  5. Disconnect the power cable (HV2) of drive motor inverter.
  6. Using an insulation multimeter, measure the resistance between power cable terminals.

    Connector & terminal 

    (HV2) U - (HV2) V: 

    (HV2) U - (HV2) W: 

    (HV2) V - (HV2) W: 

 Is either resistance value 0.3 Ω or more? Go to step 13  . Go to step 14  .
13 CHECK DRIVE MOTOR. 
  1. Disconnect the drive motor power cable (HV1).
    NOTE: The gasket is NOT reusable.
  2. Using an insulation multimeter, measure the resistance between power cable terminals.

    Connector & terminal 

    (HV1) U - (HV1) V: 

    (HV1) U - (HV1) W: 

    (HV1) V - (HV1) W: 

 Is either resistance value 0.3 Ω or more? Replace the drive motor assembly. < Ref. to appropriate DRIVE MOTOR ASSEMBLY in Continuously Variable Transmission TH58A article.> Replace the power cable. < Ref. to POWER CABLE .>
14 CHECK DRIVE MOTOR AND POWER CABLE. 
  1. Replace the drive motor assembly. < Ref. to appropriate DRIVE MOTOR ASSEMBLY in Continuously Variable Transmission TH58A article.>
  2. Replace the power cable. < Ref. to POWER CABLE .>
  3. Replace the removed/disconnected parts back to the vehicle.
  4. Perform drive cycle B. < Ref. to DRIVE CYCLE B , PROCEDURE, Drive Cycle.>
 Is the same DTC detected? (current malfunction) Go to step 15  . Problem is present in drive motor assembly or power cable.
15 CHECK DRIVE MOTOR INVERTER. 
  1. Replace the drive motor inverter. < Ref. to INVERTER .>
  2. Perform drive cycle B. < Ref. to DRIVE CYCLE B , PROCEDURE, Drive Cycle.>
 Is the same DTC detected? (current malfunction) Replace DMCM. < Ref. to appropriate DRIVE MOTOR CONTROL MODULE in Continuously Variable Transmission TH58A article.> Problem is present in drive motor inverter.
16 CHECK OF DRIVE MOTOR (DEMAGNETIZATION). 
  1. Replace the removed/disconnected parts back to the vehicle.
  2. With the 12 V battery connected, remove the service disconnect plug. < Ref. to SERVICE PLUG .>
    CAUTION: Watch for an electrical short at each harness because the 12 V battery is connected.
  3. Lift up the vehicle.
  4. Start the engine, and set the shift lever to "D" range.
  5. Using the Subaru Select Monitor, confirm the current data of drive motor control system, the values of «A/T Oil Temperature»«Drive Motor Speed»«Drive Motor Inverter Input High Voltage Sensor (Serial)». < Ref. to DRIVE MOTOR CONTROL SYSTEM , OPERATION, Read Current Data.>
 «Drive Motor Inverter Input High Voltage Sensor (Serial)» is within the standard specified in Note when «ATF Temperature » is 20 - 60°C (68 - 140°F) and «Drive Motor Speed» is 600 - 1400 rpm. Even if DTC is detected, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.
NOTE: In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.
 Replace the drive motor assembly. < Ref. to appropriate DRIVE MOTOR ASSEMBLY in Continuously Variable Transmission TH58A article.>
NOTE: Value of «Drive Motor Inverter Input High Voltage Sensor (Serial)» is proportional to «Drive Motor Speed».
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