KTronic79

Hello, If you have already replaced the ECU and the Throttle Body without any vacuum leaks, you are likely looking in the wrong place. On manual transmission cars like the Lacetti, the most common cause of RPM flaring (or rev hang) when shifting gears is a faulty Clutch Pedal Position Switch. When you press the clutch to shift, the engine loses its mechanical load. If the clutch switch is broken or disconnected, the ECU does not know you are shifting. It fails to cut the fuel in time, causing the RPM to suddenly spike by about 500 RPM. Connect your scanner, go to Live Data, and check if the state of the Clutch Switch changes from OFF to ON when you press the pedal. Good luck!

Hello StanleyJones, Yes, exactly! What you attached in the picture are the SMD (Surface Mount) versions of the ceramic resonator. That is exactly what the factory used originally. However, for a manual repair at the shop, the original SMD pads on the board are often damaged or too small. That is why modifying it with a through-hole version (like the ZTT series I mentioned) is much easier to solder and holds up much better against mechanical vibration on off-road vehicles like BRP. Good find on the picture!

Hello Igor-67, Yes, mathematically you are correct. The Motorola MC68HC908AZ60A processor can easily support an 8.00 MHz oscillator based on its datasheet. However, in automotive dashboards, you cannot simply choose a frequency. The frequency is strictly tied to the software firmware programmed inside the MCU. It calculates the Baud Rate for the CAN bus communication and the timing for the stepper motors (gauges). If the original factory design for your specific BRP cluster was 4.00 MHz, and you install an 8.00 MHz resonator, the MCU will run twice as fast. This will immediately cause a CAN Bus communication failure with the ECU, and your gauges will not work. Depending on the year and version of the BRP cluster, they used either 4.00 MHz or 8.00 MHz. They are NOT interchangeable. If you are 100% sure your exact board version used 8.00 MHz, then buy the 8.00 MHz version. If you are not sure, try the 4.00 MHz first, as it is very common on these specific boards. Best regards!

Hello Igor-67, Looking closely at the PCB footprint in your picture, it has 3 solder pads, not 2. This means the missing component is not a standard two-pin Quartz Crystal, but a 3-pin Ceramic Resonator. For this BRP dashboard, it is highly likely a 4.00 MHz Ceramic Resonator. You can easily replace it with a standard through-hole 3-pin 4.00 MHz resonator. To make it easy for you to buy, you can search for the generic part number ZTT 4.00MG or Murata CSTLS4M00. Just solder the middle pin to the center pad (which is Ground/GND), and the two outer pins to the other two pads. The orientation of the outer pins does not matter. This is a very reliable fix for dashboards exposed to vibration. I have attached a reference picture of the component for you. Good luck with the repair!

Hello, Your basic logic for an engine to run is correct: we need Air, Spark, and Fuel. Since you already confirmed there is a spark, we can skip the ignition system and focus entirely on the fuel system based on your Live Data. The most critical clue in your post is: "Techstream shows fuel pressure is ZERO". If Techstream can read fuel pressure, this car likely has a Direct Injection (GDI/D-4S) system with a High-Pressure Fuel Pump (HPFP). Here is my advice on what to check next: 1. Verify the Fuel Pressure Sensor: Is the pressure actually zero, or is the sensor dead? Unplug the sensor on the fuel rail and check for a 5V reference and ground using a multimeter. If the wiring is good, the sensor might be stuck. 2. Old Fuel Issue (2 Years Sitting): Gasoline goes bad and turns into varnish after 2 years. This stale fuel can completely destroy or stick the mechanical High-Pressure Fuel Pump (driven by the camshaft) or stick the injectors wide open. 3. Mechanical Test: You confirmed the low-pressure pump in the tank works. Now, you need to check if the HPFP is generating pressure. If the injectors are stuck open due to bad gas, it will dump all the fuel pressure into the cylinders (check if the spark plugs are wet or if the oil smells like gas). Clear the old gas, check the HPFP, and monitor the Live Data again. Good luck!