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DTC P0A5D: Drive Motor "A" Phase U Current: 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 Phase U Current - Wiring Diagram (1 Of 2)
G09479248Courtesy of SUBARU OF AMERICA, INC.
Fig 2: Drive Motor A Phase U Current - Wiring Diagram (2 Of 2)
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 any other DTCs 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 value of «Phase U Amperage Sensor Voltage». < Ref. to DRIVE MOTOR CONTROL SYSTEM , OPERATION, Read Current Data.>		 Is the value 2.5 V ±0.1 V with IG ON? Go to step 3  . Perform the diagnosis according to DTC P0BE6 and P06B1. < Ref. to DRIVE MOTOR CONTROL SYSTEM , LIST, List of Diagnostic Trouble Code (DTC).>
3 CHECK HARNESS (GATE SIGNAL SHORT TO POWER AND SHORT IN OTHER SIGNAL LINES). 
  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. Remove the service disconnect plug. < Ref. to SERVICE PLUG .>
  4. Wait for 10 minutes.
  5. Disconnect the DMCM connector (R442, R443).
  6. Disconnect the intermediate connector (R436).
  7. Disconnect the drive motor inverter connector.
  8. Using a tester, measure the resistance between terminals in DMCM connectors (R442, R443) and between each terminal in inverter connector.

    Connector & terminal 

    (R442) No. 2 - (R442) No. 1 - 22: 

    (R442) No. 2 - (R443) No. 1 - 26: 

    (R442) No. 2 - (R436) No. 1 - 8: 

    (R442) No. 2 - (R432) No. 7: 

    (R442) No. 1 - (R442) No. 1 - 22: 

    (R442) No. 1 - (R443) No. 1 - 26: 

    (R442) No. 1 - (R436) No. 1 - 8: 

    (R442) No. 1 - (R432) No. 7: 

    (R442) No. 15 - (R442) No. 1 - 22: 

    (R442) No. 15 - (R443) No. 1 - 26: 

    (R442) No. 15 - (R436) No. 1 - 8: 

    (R442) No. 15 - (R432) No. 7: 

    (R442) No. 14 - (R442) No. 1 - 22: 

    (R442) No. 14 - (R443) No. 1 - 26: 

    (R442) No. 14 - (R436) No. 1 - 8: 

    (R442) No. 14 - (R432) No. 7: 

    (R442) No. 13 - (R442) No. 1 - 22: 

    (R442) No. 13 - (R443) No. 1 - 26: 

    (R442) No. 13 - (R436) No. 1 - 8: 

    (R442) No. 13 - (R432) No. 7: 

    (R442) No. 12 - (R442) No. 1 - 22: 

    (R442) No. 12 - (R443) No. 1 - 26: 

    (R442) No. 12 - (R436) No. 1 - 8: 

    (R442) No. 12 - (R432) No. 7: 

 Is the resistance 1 MΩ or more? Go to step 4  . Repair short circuit in harness between DMCM connector and drive motor inverter, or repair the intermediate connector.
4 CHECK DRIVE MOTOR INVERTER (INTERNAL SHORT). 
  1. Disconnects power cable terminals (HV2, HV3) of the drive motor inverter and bus bar (HV5).
    NOTE: Be sure to use insulating tape.
  2. Using a tester, check for continuity between drive motor inverter terminals.
    NOTE: When checking continuity, always follow the combinations as follows with correct polarities. If polarities are reversed when checking, the trouble may not be accurately diagnosed.

    Connector & terminal 

    (HV5) P (+) - (HV2) U (-): 

    (HV2) U (+) - (HV5) N (-): 

    (HV5) P (+) - (HV2) V (-): 

    (HV2) V (+) - (HV5) N (-): 

    (HV5) P (+) - (HV2) W (-): 

    (HV2) W (+) - (HV5) N (-): 

    (HV5) P (+) - (HV5) N (-): 

    (HV2) U (+) - (HV2) V (-): 

    (HV2) U (+) - (HV2) W (-): 

    (HV2) V (+) - (HV2) W (-): 

    (HV5) P (+) - Chassis ground (-): 

    (HV5) N (+) - Chassis ground (-): 

    (HV2) U (+) - Chassis ground (-): 

    (HV2) V (+) - Chassis ground (-): 

    (HV2) W (+) - Chassis ground (-): 

 Is there continuity? Replace the drive motor inverter. < Ref. to INVERTER .> Go to step 13  . Go to step 5  .
5 CHECK DRIVE MOTOR INVERTER (RELEASED). 
Using diode voltage measuring mode on an insulation multimeter, measure the voltage between the terminals of the drive motor inverter.
NOTE: When checking voltage values, always follow the combinations as follows with correct polarities. If polarities are reversed when checking, the trouble may not be accurately diagnosed.
Connector & terminal 
(HV2) U (+) - (HV5) P (-): 
(HV5) N (+) - (HV2) U (-): 
(HV2) V (+) - (HV5) P (-): 
(HV5) N (+) - (HV2) V (-): 
(HV2) W (+) - (HV5) P (-): 
(HV5) N (+) - (HV2) W (-): 
 Is "O.L" indicated? Replace the drive motor inverter. < Ref. to INVERTER .> Go to step 13  . Go to step 6  .
6 CHECK HIGH VOLTAGE UNIT (SHORT). 
  1. Remove electric noise filter, DC/DC converter, and electric oil pump inverter.
  2. Check continuity between each terminal of the unit.
    NOTE:
    • When checking voltage values, always follow the combinations as follows with correct polarities. If polarities are reversed when checking, the trouble may not be accurately diagnosed.
    • For ground measuring points of electric noise filter, DC/DC converter, and electric oil pump inverter, refer to Notes in the margin.

    Connector & terminal 

    (HV6) P (+) - (HV7) N (-): 

    (HV6) P (+) - Electric noise filter ground (-): 

    (HV6) N (+) - Electric noise filter ground (-): 

    (HV3) P (+) - (HV3) N (-): 

    (HV3) P (+) - DC/DC converter ground (-): 

    (HV3) N (+) - DC/DC converter ground (-): 

    (HV9) P (+) - (HV9) N (-): 

    (HV9) P (+) - (HV10) U (-): 

    (HV9) P (+) - (HV10) V (-): 

    (HV9) P (+) - (HV10) W (-): 

    (HV10) U (+) - (HV9) N (-): 

    (HV10) V (+) - (HV9) N (-): 

    (HV10) W (+) - (HV9) N (-): 

    (HV10) U (+) - (HV10) V (-): 

    (HV10) U (+) - (HV10) W (-): 

    (HV10) V (+) - (HV10) W (-): 

    (HV9) P (+) - Electric oil pump inverter ground (-): 

    (HV9) N (+) - Electric oil pump inverter ground (-): 

    (HV10) U (+) - Electric oil pump inverter ground (-): 

    (HV10) V (+) - Electric oil pump inverter ground (-): 

    (HV10) W (+) - Electric oil pump inverter ground (-): 

    (HV8) P (+) - (HV8) N (-): 

    (HV8) P (+) - Chassis ground (-): 

    (HV8) N (+) - Chassis ground (-): 

 Is there continuity? Replace the unit that has continuity. Go to step 13  . Go to step 7  .
7 CHECK POWER CABLE AND DRIVE MOTOR (SHORT TO GROUND). 
Using an insulation multimeter (250 V range), measure the resistance between power cable terminal (HV2) of the drive motor inverter and the ground bolt of inverter frame body.
Connector & terminal 
(HV2) U - Ground bolt of inverter frame body: 
(HV2) V - Ground bolt of inverter frame body: 
(HV2) W - Ground bolt of inverter frame body: 		 Is the resistance 2 MΩ or more? If you have a milliohm tester at hand, Go to step 8  . If a milliohm tester is NOT at hand, Go to step 1  . Go to step 9  .
8 CHECK POWER CABLE AND DRIVE MOTOR (SHORT). 
Using a milliohm tester, measure the resistance between terminals of drive motor inverter power cable.
Connector & terminal 
(HV2) U - (HV2) V: 
(HV2) U - (HV2) W: 
(HV2) V - (HV2) W: 		 Is resistance between either lines less than 25 mΩ? Go to step 1  . Replace DMCM. < Ref. to appropriate DRIVE MOTOR CONTROL MODULE in Continuously Variable Transmission TH58A article.>
9 CHECK DRIVE MOTOR (SHORT TO GROUND). 
  1. Leave the vehicle under temperature of 40°C (104°F) or less for 10 minutes.
  2. Disconnect the drive motor power cable (HV1).
    NOTE: The gasket is NOT reusable.
  3. Using an insulation multimeter (250 V range), measure the resistance between each terminal and chassis ground.

    Connector & terminal 

    (HV1) U - Chassis ground: 

    (HV1) V - Chassis ground: 

    (HV1) W - Chassis ground: 

 Does the resistance between any points show less than 2 MΩ? Replace the drive motor assembly. < Ref. to appropriate DRIVE MOTOR ASSEMBLY in Continuously Variable Transmission TH58A article.> Repair or replace the short circuit of the power cable. Go to step 13  .
10 CHECK DRIVE MOTOR (SHORT). 
  1. Leave the vehicle under temperature of 40°C (104°F) or less for 10 minutes.
  2. Disconnect the drive motor power cable (HV1).
    NOTE: The gasket is NOT reusable.
  3. 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 resistance between either lines less than 20 mΩ? Replace the drive motor assembly. < Ref. to appropriate DRIVE MOTOR ASSEMBLY in Continuously Variable Transmission TH58A article.> Repair or replace the short circuit of the power cable. Go to step 13  .
11 CHECK DRIVE MOTOR (SHORT). 
  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.>
 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.
 Go to step 1  . Replace DMCM. < Ref. to appropriate DRIVE MOTOR CONTROL MODULE in Continuously Variable Transmission TH58A article.>
12 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. Remove the service disconnect plug. < Ref. to SERVICE PLUG .>
  4. Wait for 10 minutes.
  5. Disconnect the drive motor power cable (HV1).
    NOTE: The gasket is NOT reusable.
  6. Disconnect the power cable (HV2) of drive motor inverter.
  7. 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.> Repair or replace the short circuit of the power cable. Go to step 13  .
13 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: Ground measuring points
NOTE: Value of «Drive Motor Inverter Input High Voltage Sensor (Serial)» is proportional to «Drive Motor Speed».
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