Performing a transmission fluid pressure test on a Subaru Impreza WRX STI involves several steps and requires specific tools and equipment. click here for more details on the download manual…..
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below is a detailed guide on how to conduct this test, including descriptions of the necessary components:
### Tools and Equipment Needed
1. **Transmission Pressure Gauge Kit**:
– A gauge that can measure hydraulic pressure, typically ranging from 0 to 300 PSI.
– Includes adapters for various transmission lines.
2. **Wrenches and Sockets**:
– Standard and metric wrenches for removing components.
– Ratchet and socket set for bolts.
3. **Screwdriver Set**:
– Flathead and Phillips screwdrivers for various fasteners.
4. **Pliers**:
– To remove clamps or hoses.
5. **Fluid Catch Pan**:
– A container to catch any fluid that may spill during the process.
6. **Transmission Fluid**:
– Ensure you have the correct type of fluid for your Subaru (typically Subaru ATF for automatic transmissions).
7. **Safety Gear**:
– Gloves, safety glasses, and possibly a face mask for protection against fluid.
### Preparation Steps
1. **Safety First**:
– Park the vehicle on a level surface and engage the parking brake. Ensure that the engine is off and cool before beginning.
2. **Gather Materials**:
– Have all tools and equipment ready and easily accessible.
3. **Lift the Vehicle**:
– If necessary, use a hydraulic jack to lift the front of the vehicle and secure it with jack stands to access the transmission area.
### Conducting the Pressure Test
1. **Locate the Transmission Test Port**:
– On the Subaru Impreza WRX STI, the test port is usually located on the transmission itself. Refer to the service manual for the exact location, as it may vary by year.
2. **Remove the Test Port Plug**:
– Use the appropriate wrench to carefully remove the test port plug. Be prepared for some fluid to spill out. Use a catch pan to collect any fluid.
3. **Install the Pressure Gauge**:
– Take the transmission pressure gauge and attach it to the test port. Ensure it is securely connected to avoid leaks.
– If necessary, use the appropriate adapter to make the connection.
4. **Start the Engine**:
– With the gauge connected, start the engine and allow it to idle. Make sure the vehicle is in park (for automatic transmissions) or neutral (for manual transmissions).
5. **Check Pressure Readings**:
– Observe the pressure gauge readings. You will typically want to check the pressure at various points:
– **Idle**: Note the pressure at idle. The typical range should be specified in the service manual.
– **In Gear**: Shift the transmission into gear (Drive or Reverse) and observe the pressure reading.
– **WOT (Wide Open Throttle)**: If specified, perform this test to measure pressure at full throttle.
6. **Compare Readings**:
– Compare the readings to the specifications in the service manual. Abnormal readings can indicate issues such as low fluid levels, pump problems, or internal leaks.
7. **Shut Off the Engine**:
– After taking the necessary readings, turn off the engine.
8. **Remove the Gauge**:
– Carefully unscrew the pressure gauge from the test port. Be cautious of any remaining fluid that may spill.
9. **Reinstall the Test Port Plug**:
– Use a new sealing washer if necessary
and reinstall the test port plug securely.
### Final Steps
1. **Check Fluid Level**:
– After the test, check the transmission fluid level. If any fluid was lost during the test, top it off using the correct type of transmission fluid.
2. **Inspect for Leaks**:
– Start the vehicle again and inspect the test port for any leaks.
3. **Lower the Vehicle**:
– If the vehicle was lifted, safely lower it back to the ground after ensuring all tools and equipment are removed from underneath.
### Conclusion
A transmission fluid pressure test helps diagnose potential transmission issues on a Subaru Impreza WRX STI. Properly interpreting the pressure readings is crucial for identifying problems. If you find any anomalies in the pressure readings, consult a professional mechanic or refer to the service manual for further diagnostic steps. Always follow safety precautions when working under the vehicle and handling transmission fluid.
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