How to Check the Engine in an Infiniti G35

A diagnostic scanner is one of the most reliable ways to check an Infiniti G35's engine. The G35 uses a computer commonly called a Powertrain Control Module, which consistently monitors a sensors and functions within the engine. As soon as a malfunction or fault occurs, the computer assigns it a code. If the problem persists, the code becomes classified as "trouble" and your check engine light switches on. A diagnostic scanner can not only check for current trouble codes, but all other less frequent malfunctions.

Things You'll Need

  • OBD-II scanner
  • Connect a diagnostic cable to your OBD-II scanner, and then connect the cable to the Infinit G35's computer outlet. This port is commonly referred to as a Data Link Connector, and it can be found underneath the Infiniti's dash, near the hood release. It will not be covered, and you need no tools access it.

  • Turn the Infiniti G35's ignition key to the "On" position. Some diagnostic handhelds require not just the electronic system to be active, but the Infiniti's engine running.

  • Retrieve the codes by pressing the appropriate command buttons. OBD-II code readers and scanners all have different physical layouts with buttons located in different places. You will need to consult your handheld's user manual for the exact, appropriate procedure. If you own a preset scanner that automatically pulls OBD-II codes upon connection, then you need not worry about any of this.

  • Look at the codes on your screen. For the time being, you only need to be concerned with OBD-II codes that start with the letter "P." Those are powertrain codes. Also, look at how the your device distinguishes the codes. There should be an icon or some other indicator for "trouble" and "pending" code status.

  • Find the definitions and explanations for the OBD-II codes on your screen. Your Infiniti G35 will not have these within its pages. Generic OBD-II codes are used on all OBD-II compliant vehicles, and these will more than likely be found in your scanner's manual. If you cannot find them there, you can easily locate OBD-II codes online. Infiniti has a separate set of codes unique to their vehicles. Those are also not in your vehicle's manual, but they will likely not be in your scanner's manual. You will need to find this online, as well.

  • Compile a list of problems suggested by your Infiniti's computer, based on the coding definitions. Read over this list and consider your own level of expertise and experience. You are confident in your ability, open the Infiniti's hood and troubleshoot the engine in further detail. If the problems are beyond your capabilities, seriously consider driving the G35 to a repair shop.