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Home >> Subaru >> 2020 >> Crosstrek Base, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 16 (P-HEV Hybrid Powertrain Control System (Diagnostics) (2 Of 2)) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P3107-64: Lost Communication With Airbag System Control Module Signal Plausibility Failure >> Notes

DTC P3107-64: Lost Communication With Airbag System Control Module Signal Plausibility Failure: Notes

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

1. - 

Outline of diagnosis: 

Fault of communication signal pulse

Communication signal pulse from AIRBAG CONTROL MODULE was lost, and signal validity fault continued for a predetermined period of time

(1 trip detection logic)

Trouble symptom: 

Normal driving

Wiring diagram: 

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

G13618132Courtesy 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 .
G13618140Courtesy of SUBARU OF AMERICA, INC.
G13618141Courtesy of SUBARU OF AMERICA, INC.
  1. CHECK DTC  .

    Read the DTC of [Airbag] using the Subaru Select Monitor. Ref. to AIRBAG (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

    Are any DTCs displayed?

    Yes  : Perform the diagnosis for the displayed DTCs. Ref. to AIRBAG (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

    No  : Go to  2.

  2. CHECK DTC  .
    1. Turn to IG ON.
    2. Using the Subaru Select Monitor, perform the clear memory of [P-HEV Hybrid Powertrain Control]. Ref. to COMMON (DIAG)>CLEAR MEMORY .
    3. 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 P310764 displayed?

    Yes  : Go to  3.

    No  : Even if DTC is displayed, 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, or temporary open or short circuit of the Wire harness may be the cause.
  3. CHECK AIRBAG CONTROL MODULE (WAVEFORM MEASUREMENT)  .
    CAUTION: To measure the voltage and resistance of airbag system component, be sure to use the specified test Wire harness. Ref. to AIRBAG (DIAGNOSTICS)>GENERAL DESCRIPTION>PREPARATION TOOL .
    1. Turn the ignition to OFF.
    2. Connect an oscilloscope to each terminal of AIRBAG CONTROL MODULE.
    3. Turn to READY ON.
    4. Using an oscilloscope, measure the waveform between the connector terminals of each terminal in AIRBAG CONTROL MODULE. (With the connector connected)

      Connector & terminal 

      (AB6) No. 14 - (AB6) No. 25:

      Gauge set: 5 V/DIV, 500 ms/DIV

      Measurement condition: READY ON

      G13238067Courtesy of SUBARU OF AMERICA, INC.

    Can the reference waveform above be measured?

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

    No  : Go to  4.

  4. CHECK CONNECTION CONDITION OF CONNECTOR (Hybrid vehicle control ECU assembly CONNECTOR)  .
    1. Turn the ignition to OFF.
    2. Check the connecting condition of connector (i369) in Hybrid vehicle control ECU assembly and check the relevant terminals for contact pressure, deformation and intrusion of water or foreign matter. Ref. to HYBRID ELECTRIC VEHICLE>HYBRID POWERTRAIN CONTROL MODULE .

    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  5.

  5. CHECK CONNECTION CONDITION OF CONNECTOR (AIRBAG CONTROL MODULE CONNECTOR)  .

    Check the connecting condition of connector (AB6) in AIRBAG CONTROL MODULE and check the relevant terminals for contact pressure, deformation and intrusion of water or foreign matters. Ref. to AIRBAG SYSTEM>AIRBAG CONTROL MODULE .

    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  6.

  6. CHECK Wire harness AND CONNECTOR (Hybrid vehicle control ECU assembly - AIRBAG CONTROL MODULE) (SHORT TO POWER SUPPLY)  .
    1. Disconnect Hybrid vehicle control ECU assembly connector (i369).
    2. Disconnect AIRBAG CONTROL MODULE connector (AB6).
    3. Connect the Battery (12V) ground terminal. Ref. to REPAIR CONTENTS>REPAIR CONTENTS>NOTE>BATTERY .
    4. Turn to IG ON.
    5. Using a tester, measure the voltage between Hybrid vehicle control ECU assembly connector and chassis ground.

      Connector & terminal 

      (i369) No. 7 (+) - Chassis ground (-):

    Is the voltage less than 1 V?

    Yes  : Go to  7.

    No  : Repair or replace the Wire harness between Hybrid vehicle control ECU assembly connector and AIRBAG CONTROL MODULE connector.

  7. CHECK Wire harness AND CONNECTOR (Hybrid vehicle control ECU assembly - AIRBAG CONTROL MODULE) (OPEN CIRCUIT)  .
    CAUTION: To measure the voltage and resistance of airbag system component, be sure to use the specified test Wire harness. Ref. to AIRBAG (DIAGNOSTICS)>GENERAL DESCRIPTION>PREPARATION TOOL .
    1. Turn the ignition to OFF.
    2. Disconnect the ground terminal of Battery (12V). Ref. to REPAIR CONTENTS>REPAIR CONTENTS>NOTE>BATTERY .
    3. Using a tester, measure the resistance between Hybrid vehicle control ECU assembly connector and AIRBAG CONTROL MODULE connector.

      Connector & terminal 

      (AB6) No. 14 - (i369) No. 7:

    Is the resistance less than 1 Ω?

    Yes  : Go to  8.

    No  : Repair or replace the Wire harness between Hybrid vehicle control ECU assembly connector and AIRBAG CONTROL MODULE connector.

  8. CHECK Wire harness AND CONNECTOR (Hybrid vehicle control ECU assembly - AIRBAG CONTROL MODULE) (SHORT TO GROUND OR LINE-TO-LINE SHORT)  .

    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.

    CAUTION: To measure the voltage and resistance of airbag system component, be sure to use the specified test Wire harness. Ref. to AIRBAG (DIAGNOSTICS)>GENERAL DESCRIPTION>PREPARATION TOOL .

    Connector & terminal 

    (i369) No. 7 - (i369) No. 1 - 35:

    (i369) No. 7 - Chassis ground:

    Is the resistance 10 kΩ or more?

    Yes  : Replace AIRBAG CONTROL MODULE. Ref. to AIRBAG SYSTEM>AIRBAG CONTROL MODULE .

    No  : Repair or replace the Wire harness between Hybrid vehicle control ECU assembly connector and AIRBAG CONTROL MODULE connector.

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