Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Lost Communication with Airbag System Control Module Circuit Short to Ground (P310711)

Toyota Corolla Cross (2022-2024) Service Manual / Engine & Hybrid System / Hybrid / Battery Control / Hybrid Control System / Lost Communication with Airbag System Control Module Circuit Short to Ground (P310711)

DESCRIPTION

The hybrid vehicle control ECU detects a problem in the collision signal line from the airbag ECU assembly and alerts the driver.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Warning Indicate

Note

P310711

Lost Communication with Airbag System Control Module Circuit Short to Ground

Short to ground in the communication circuit:

Communication from the airbag ECU assembly stopped and Circuit Low has been detected for a certain period.

(1 trip detection logic)
  • Wire harness or connector
  • Airbag ECU assembly
  • Hybrid vehicle control ECU

Does not come on

Master Warning:

Comes on

SAE Code:

P3107

CONFIRMATION DRIVING PATTERN

HINT:

After repairs have been completed, clear the DTCs and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

Click here

  1. Connect the GTS to the DLC3.
  2. Turn the ignition switch to ON and turn the GTS on.
  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
  4. Turn the ignition switch off and wait for 2 minutes or more.
  5. Turn the ignition switch to ON and turn the GTS on.
  6. With ignition switch to ON and wait for 2 minutes or more.
  7. Enter the following menus: Powertrain / Hybrid Control / Utility / All Readiness.
  8. Check the DTC judgment result.

    HINT:

    • If the judgment result shows NORMAL, the system is normal.
    • If the judgment result shows ABNORMAL, the system has a malfunction.
    • If the judgment result shows INCOMPLETE or N/A, perform driving pattern again.

WIRING DIAGRAM

PROCEDURE

1.

CHECK DTC OUTPUT (SRS AIRBAG)

(a) Check for DTCs.

Body Electrical > SRS Airbag > Trouble Codes
Result

Proceed to

DTCs are not output

A

DTCs are output

B
B

GO TO DTC CHART (AIRBAG SYSTEM)

A

2.

CHECK AIRBAG ECU ASSEMBLY (CHECK WAVEFORM)

(a) Connect an oscilloscope between the airbag ECU assembly terminals specified in the table below.

(b) Turn the ignition switch to ON (READY).

(c) Measure the waveform.

Item

Contents

Terminal

I47-24 (GSW2) - I47-33 (E1)

Equipment Setting

5 V/DIV., 500 ms./DIV.

Condition

Ignition switch ON (READY)

Result:

Result

Proceed to

The waveform appears as shown in the illustration.

A

The waveform differs from the one shown in the illustration.

B

*a

Component with harness connected

(Airbag ECU Assembly)

(d) Turn the ignition switch off.

B

GO TO STEP 6

A

3.

CLEAR DTC

Click here

NEXT

4.

CHECK DTC OUTPUT (HYBRID CONTROL)

(a) Check for DTCs.

Powertrain > Hybrid Control > Trouble Codes
Result

Proceed to

P310711 is not output

A

P310711 is output

B
B

REPLACE HYBRID VEHICLE CONTROL ECU

A

5.

CHECK FOR INTERMITTENT PROBLEMS

Click here

OK

REPLACE HYBRID VEHICLE CONTROL ECU

NG

REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA

6.

CHECK AIRBAG ECU ASSEMBLY

(a) Disconnect the airbag ECU assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

I47-24 (GSW2) - I47-33 (E1)

Ignition switch off

10 kΩ or higher

*a

Component without harness connected

(Airbag ECU Assembly)

(c) Reconnect the airbag ECU assembly connector.

NG

REPLACE AIRBAG ECU ASSEMBLY

OK

7.

CHECK HARNESS AND CONNECTOR (HYBRID VEHICLE CONTROL ECU - AIRBAG ECU ASSEMBLY)

(a) Disconnect the hybrid vehicle control ECU connector.

(b) Disconnect the airbag ECU assembly connector.

(c) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

I249-12 (ABFS) or I47-24 (GSW2) - Body ground and other terminals

Ignition switch off

10 kΩ or higher

(d) Reconnect the airbag ECU assembly connector.

(e) Reconnect the hybrid vehicle control ECU connector.

OK

REPLACE HYBRID VEHICLE CONTROL ECU

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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