LEMON Manuals: Even more car manuals for everyone
Home >> Subaru >> 2020 >> Crosstrek Base, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 6 (P-HEV Hybrid Powertrain Control System (Diagnostics) (1 Of 2)) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P0A1B-94: Drive Motor "A" Control Module Unexpected Operation >> Notes

DTC P0A1B-94: Drive Motor "A" Control Module Unexpected Operation: Notes

WARNING: This page is about a different variant/trim than selected.

1. - 

Outline of diagnosis: 

Information of Motor generator control ECU was received at Hybrid vehicle control ECU assembly, and an unexpected value continued for a predetermined period of time

(1 trip detection logic)

Trouble symptom: 

  1. Normal driving
  2. When malfunction continues
    • Hybrid system stopped

Wiring diagram: 

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

G13617954Courtesy of SUBARU OF AMERICA, INC.
CAUTION: Before performing diagnosis, refer to "CAUTION" in "General Description". Ref. to P-HEV HYBRID POWERTRAIN CONTROL (DIAGNOSTICS)>GENERAL DESCRIPTION>CAUTION .
G13617955Courtesy of SUBARU OF AMERICA, INC.
  1. CHECK Battery (12V) terminal  .
    NOTE: To check if DTC is reproduced, turn to IG ON before checking DTC, and shake Wire harness vertically or horizontally.

    Check the connecting condition of Battery (12V) terminal. Ref. to REPAIR CONTENTS>REPAIR CONTENTS>NOTE>BATTERY .

    Is there looseness or poor contact in the terminal?

    Yes  : Connect Battery (12V) terminal securely.

    No  : Go to  2.

  2. CHECK GROUND WIRE CONNECTION  .
    NOTE: To check if DTC is reproduced, turn to IG ON before checking DTC, and shake the wire harness vertically or horizontally.

    Check connection of the ground wire on the body side that is connected to the ground terminal.

    Is the ground wire connected to the body securely?

    Yes  : Go to  3.

    No  : Connect the ground wire securely.

  3. CHECK Slow blow fuse  .
    1. Disconnect the ground terminal of Battery (12V). Ref. to REPAIR CONTENTS>REPAIR CONTENTS>NOTE>BATTERY .
    2. Disconnect the positive terminal of Battery (12V). Ref. to STARTING/CHARGING SYSTEMS (H4DO (HEV))>BATTERY .
    3. Check the installation condition of Slow blow fuse. Ref. to STARTING/CHARGING SYSTEMS (H4DO (HEV))>BATTERY CABLE ASSEMBLY .

    Is it tightened securely, and free from poor contact?

    Yes  : Go to  4.

    No  : Install securely. Or repair the poor contact.

  4. CHECK Slow blow fuse  .

    Using a tester, measure the resistance of Slow blow fuse.

    Connector & terminal

    Slow blow fuse (Battery (12V) side) - Slow blow fuse (M/B side):

    Is the resistance less than 1 Ω?

    Yes  : Go to  5.

    No  : Replace Slow blow fuse (BATT-MAIN). Ref. to STARTING/CHARGING SYSTEMS (H4DO (HEV))>BATTERY CABLE ASSEMBLY .

  5. CHECK FUSE (SBF-8 30A)  .
    NOTE: To check if DTC is reproduced, turn to IG ON before checking DTC, and apply vibration to the fuse by tapping by hand and so on.
    1. Remove the SBF-8 30A FUSE from the Main fuse box (M/B). Ref. to HYBRID ELECTRIC VEHICLE>RELAY AND FUSE .
    2. Using a tester, measure the resistance between SBF-8 30A FUSE terminals.

      Connector & terminal

      SBF-8 30A FUSE (Battery (12V) side) - SBF-8 30A FUSE (IGCT IG relay side):

    Is the resistance less than 1 Ω?

    Yes  : Go to  6.

    No  : Replace the fuse.

  6. CHECK RELAY UNIT (IGCT IG)  .
    NOTE: To check if DTC is reproduced, turn to IG ON before checking DTC, and apply vibration to the relay by tapping by hand and so on.
    1. Remove the IGCT IG relay from the Relay holder. Ref. to HYBRID ELECTRIC VEHICLE>RELAY AND FUSE .
    2. Using a tester, measure the resistance between IGCT IG relay terminals.

      Connector & terminal 

      (B225) No. 32 - (B225) No. 33:

    Is the resistance as follows?

    When Battery (12V) voltage is applied between terminals of (B225) No. 31 (+) - (B225) No. 34 (-): Less than 1 Ω

    When Battery (12V) voltage is not applied between terminals of (B225) No. 31 (+) - (B225) No. 34 (-): 10 kΩ or more

    Yes  : Go to  7.

    No  : Replace IGCT IG relay. Ref. to HYBRID ELECTRIC VEHICLE>RELAY AND FUSE .

  7. CHECK DTC  .

    Read the DTC of [P-HEV Hybrid Powertrain Control] using the Subaru Select Monitor. Ref. to P-HEV HYBRID POWERTRAIN CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

    Is DTC other than P0A1B94 displayed?

    Yes  : Perform the diagnosis for DTC other than P0A1B94. Ref. to P-HEV HYBRID POWERTRAIN CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

    No  : Replace Inverter with converter assembly. Ref. to HYBRID ELECTRIC VEHICLE>INVERTER AND CONVERTER ASSEMBLY .

scientia non olet · About LEMON Manuals