Maintaining the correct transmission fluid level in your Toyota, especially models with sealed transmissions (those without a dipstick), often requires checking the transmission fluid temperature. This is because the fluid expands as it heats up, and the correct level is temperature-dependent. While many generic scan tools might not support the specific transmission temperature Parameter IDs (PIDs) used by Toyota, there are effective methods to monitor this crucial parameter. This article will guide you through using an OBDII scanner, specifically highlighting the Autel Autolink Al319 Obdii Code Reader Sealed Package, and also explain Toyota’s built-in “Transmission Temperature Check Mode.”
For those seeking a digital readout of their transmission temperature, an OBDII scanner paired with a smartphone application is a popular and effective solution. Devices like the Autel AutoLink AL319 OBDII Code Reader sealed package are readily available and compatible with ELM327 protocols, making them versatile tools for this task. Combined with apps like OBD Fusion (available for a small fee) or Torque Pro (also reasonably priced), you can access detailed vehicle diagnostics, including transmission temperature.
To utilize this method, you’ll need an ELM327-compliant OBDII Bluetooth dongle, often costing around $20, and your chosen smartphone app. OBD Fusion may require an additional ‘enhanced diagnostics’ package, specific to your Toyota model, to access transmission temperature PIDs. Torque Pro, on the other hand, might require some manual configuration. You may need to search Toyota forums or the Torque Pro forum to find and manually enter the custom PID data necessary for your specific Toyota model to display transmission temperatures. While this might sound technical, online communities are generally helpful in providing these custom PID sets.
However, if your primary goal is solely to check the transmission temperature to ensure the correct fluid level after a drain and fill or fluid flush on a Toyota sealed transmission, Toyota provides a built-in “Transmission Temperature Check Mode.” This ingenious method, detailed in Toyota Factory Service Manuals, eliminates the need for any scan tool.
To activate this mode, you’ll need to use a jumper wire to connect pins 4 and 13 in your vehicle’s OBD port. Following this, a specific shift sequence is required: slowly shift back and forth between Neutral and Drive for approximately six seconds. If executed correctly, the (D) drive indicator light on your dashboard will illuminate for about two seconds, confirming that you have successfully entered the Transmission Temperature Check Mode.
Once in check mode, let the vehicle idle. Wait for the (D) drive indicator light to illuminate again. This second illumination indicates that the transmission fluid has reached the correct temperature range for checking the fluid level. At this point, you need to be prepared to quickly open the transmission overflow plug and check the fluid level while the engine is still idling. It’s crucial to be prompt, as the indicator light will begin to blink if the transmission temperature rises above the acceptable check range, signaling that it has become too hot.
Detailed instructions and visual guides for this manual method are readily available on numerous Toyota forums and YouTube videos. While this manual procedure is documented in Factory Service Manuals for earlier Toyota models and is highly likely to apply to newer models, such as a 2021, it is always advisable to verify the procedure in your specific model’s Factory Service Manual (FSM). Resources like AllData or Mitchell, or Toyota-specific online forums, can also be valuable for confirming the correct procedure for your exact vehicle year and model. Even your local Toyota dealership’s service department might be able to offer guidance.
In conclusion, whether you opt for the convenience of an OBDII scanner like the Autel AutoLink AL319 OBDII code reader sealed package with a smartphone app or prefer to utilize Toyota’s built-in “Transmission Temperature Check Mode,” monitoring your Toyota’s transmission temperature is achievable. Choosing the best method depends on your tools, technical comfort level, and whether you require a digital temperature readout or simply need to verify the fluid level at the correct temperature. Always prioritize consulting your vehicle’s specific service manual or reliable resources to ensure accurate procedures and maintain your Toyota’s transmission health.
