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: [BRZ Check] / [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 CHECK PROBLEMS THAT DO NOT CONSTANTLY OCCUR )
A: Go to Next Step
- Reading SSM3 data (wiring harness open circuit check)
SST 09843-18040
- Connect the SSM3 to the DLC3.
- Disconnect the connector of the intake air flow meter sub-assembly.
- Using SST (diagnostic check wire No. 2), short-circuit between terminals 1 and 2 of the intake air flow meter sub-assembly.
- Turn the ignition switch to ON.
- Select the following menu items using the SSM3: [BRZ Check] / [Each System Check] / [Engine Control System] / [Current Data Display & Save] / [Intake Air Temp.]
- Read [Current Data Display & Save].
Standard value: 120°C {248°F}
NG: Go to Step 3.
Courtesy of SUBARU OF AMERICA, INC.
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 ECM TERMINAL ARRANGEMENT
for the terminal arrangement)RESISTANCE (OPEN CIRCUIT CHECK)
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)
- Disconnect the connector of the intake air flow meter sub-assembly.
- Connect the SSM3 to the DLC3.
- Turn the ignition switch to ON.
- Select the following menu items using the SSM3: [BRZ Check] / [Each System Check] / [Engine Control System] / [Current Data Display & Save] / [Intake Air Temp.]
- Read [Current Data Display & Save].
Standard value: -40°C {-40°F}
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) )
- 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 ECM TERMINAL ARRANGEMENT
for the terminal arrangement)RESISTANCE (SHORT CIRCUIT CHECK)
Inspection terminals Inspection conditions Standard value A33-12 (THA) and C16-1 (THA) - other terminals and chassis ground Always 10 k Ωor more A36-29 (E1) and C16-2 (E2) - other terminals and chassis ground Always 10 k Ωor more NG: Repair or replacement of wiring harness or connector
OK: Replacement of the engine control computer (Refer to REMOVAL )