How to Check the ECU Code Flashes
- 1). Turn the car's ignition to the "Off" position.
- 2). Find the vehicle’s ECU connector. All vehicles equipped with OBD-II have a connector in the vehicle’s passenger compartment. Check under the dashboard and near the ashtray. The ECU port must be within three feet of the driver and not require any tools to access.
- 3). Connect the ODB-II scanner to the ECU port. The port has 16 pins, with eight pins on top and eight on the bottom; the connector is in the shape of a trapezoid.
- 4). Insert the key into the ignition and turn the key to the “On” position. Do not start the car.
- 5). Turn on the OBD-II scanner.
- 6). Press the “Read” button on the scanner.
- 7). Follow the instructions on the scanner’s LCD screen. Each manufacturer’s directions will be slightly different, so read the owner’s manual.
- 8). Write down the codes displayed on the scanner’s screen.
- 9). Look up the codes to find the specific problem (see Resources).
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