Inspection steps

NOTE: Read the freeze frame data using the SSM3. A part of the engine running conditions under which the engine trouble occurred is recorded in the freeze frame data, which is useful for troubleshooting.

Reading SSM3 data ([Intake Air Temp.])

Connect the SSM3 to the DLC3.
Turn the ignition switch to ON.
Turn on the SSM3.
Select the following menu items using the SSM3. [Inspection of BRZ]/[Each System Check]/[Engine Control System]/[Current Data Display & Save]/[Intake Air Temp.]

Read [Intake Air Temp.].

Result

Result	Go to
-40°C {-40°F}	A
120°C {248°F}	B
Equal to ambient temperature	C

NOTE:

If the SSM3 display is -40°C {-40°F}, there is an open circuit.
If the SSM3 display is 120°C {248°F}, there is a short circuit.

B: Go to Step 4.

C: Inspection for problems that do not normally occur (Refer to CHECKING/CLEARING DTC )

A: Go to next step

Reading SSM3 data (wiring harness open circuit check)
SST 09843-18040
1. Connect the SSM3 to the DLC3.
2. Disconnect the connector of the intake air flow meter sub-assembly.
3. Using SST (diagnostic check wire No. 2), short-circuit between terminals 1 and 2 of the intake air flow meter sub-assembly.
4. Turn the ignition switch to ON.
5. Select the following menu items using the SSM3. [Inspection of BRZ]/[Each System Check]/[Engine Control System]/[Current Data Display & Save]/[Intake Air Temp.]
6. Read [Current Data Display & Save].
  Standard value: 120°C {248°F}
  
  Fig 1: Intake Air Flow Meter Sub-Assembly Connector End View (C16)
  Courtesy of SUBARU OF AMERICA, INC.
  
  NG: Go to Step 3.
  
  OK: Replacement of intake air flow meter sub-assembly (Refer to INTAKE AIR FLOW METER S/A (FA20) )

Check wiring harness and connector (engine control computer - intake air flow meter sub-assembly)

NOTE: For the inspection procedure and precautions for wiring harnesses and connectors, refer to INSPECTION PROCEDURES FOR ELECTRICAL CIRCUITS AND HOW TO PERFORM .

Disconnect the connector for the engine control computer.
Disconnect the connector of the intake air flow meter sub-assembly.

Measure the resistance between the terminals. (Refer to TERMINAL ARRANGEMENT )

Resistance (open circuit check)

TORQUE UP PROHIBITION REQUEST (EFI →VSC) ITEM DESCRIPTION

Inspection terminals	Inspection conditions	Standard value
A33-12 (THA) - C16-1 (THA)	Always	Less than 1 Ω
A36-29(E1) - C16-2(E2)	Always	Less than 1 Ω

NG: Repair or replacement of wiring harness or connector

OK: Replacement of the engine control computer (Refer to REMOVAL )

Reading SSM3 data (wiring harness short circuit check)
1. Disconnect the connector of the intake air flow meter sub-assembly.
2. Connect the SSM3 to the DLC3.
3. Turn the ignition switch to ON.
4. Select the following menu items using the SSM3. [Inspection of BRZ]/[Each System Check]/[Engine Control System]/[Current Data Display & Save]/[Intake Air Temp.]
5. Read [Current Data Display & Save].
  Standard value: -40°C {-40°F}
  
  Fig 2: Intake Air Flow Meter Sub-Assembly Circuit Diagram
  Courtesy of SUBARU OF AMERICA, INC.
  
  NG: Go to Step 5.
  
  OK: Replacement of intake air flow meter sub-assembly (Refer to INTAKE AIR FLOW METER S/A (FA20) )