Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSSUBARU2014IMPREZA SPORT LIMITEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 2 (AUTOMATIC TRANSMISSION - MECHANISM & FUNCTION (5AT))ON-BOARD DIAGNOSTIC SYSTEMFUNCTION
2014 Subaru Impreza Sport Limited
On-board Diagnostic System: Function
2014 Subaru Impreza Sport LimitedSECTION Function
WARNING: This page does not describe the selected car, but rather 15 other vehicles, including the 2014 Subaru Tribeca, 2014 Subaru Outback, 2014 Subaru Legacy, 2013 Subaru Tribeca, and 2013 Subaru Outback. However, it is still accessible from the selected car via links, so may be relevant.
- The on-board diagnostic system detects malfunction and generates and displays the codes corresponding to the location of each malfunction. The malfunction indicator light (AT OIL TEMP light) on the combination meter blinks to indicate occurrence of a failure or error.
- If the malfunction indicator light lights up as a result of TCM detecting a malfunction, the diagnostic trouble code (DTC) corresponding to the malfunction is stored in TCM.
- When checking DTC on the models supporting OBD-II, it is required to connect Subaru Select Monitor (SSM) to data link connector.
- To facilitate each function and failure diagnosis, a diagnostic system that supports SSM is used.
- The on-board diagnostic system detects electrical failures or system errors as shown below.
| Front brake oil pressure switch | Front and rear wheel speed sensor |
| Input clutch oil pressure switch | Turbine speed sensor 1 and 2 |
| Forward brake oil pressure switch | Brake signal |
| Direct clutch oil pressure switch | ATF temperature sensor |
| High&low reverse clutch oil pressure switch | Lateral G sensor |
| Line pressure solenoid (circuit) | CAN communication system |
| Transfer solenoid (circuit) | SPORT shift mode switch |
| Lock-up solenoid (circuit, function) | Range switch system |
| Front brake solenoid (circuit, function) | Back lamp relay output circuit |
| Input clutch solenoid (circuit, function) | PN signal output circuit |
| Forward brake solenoid (circuit, function) | Reverse inhibitor circuit |
| Direct clutch solenoid (circuit, function) | 1, 2, 3, 4, 5, R gear ratio |
| High&low reverse clutch solenoid (circuit, function) |
If a malfunction is detected, the system notifies the malfunction by blinking the AT OIL TEMP light.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.