1 Drive vehicle until it reaches operating temperature.
2 Stop the vehicle, place it in park or neutral and turn ignition OFF.
4 Turn ignition ON, the Check Engine Light (CEL) (Check Engine Light) will illuminate.
5 Immediately CLOSE the switch. The light will extinguish and then illuminate for one short flash.
6 Immediately OPEN the switch.
7 Read codes as described in the Code Format Description below.
Note:To retrieve the next code, close the switch and wait for the Check Engine Light (CEL) to flash once. Immediately open the switch and it will display the next 5-digit fault code.
Note 2:If you receive code 13231 or 12231 (no ignition signal), crank engine and re-test. If code dissapears, disregard code.
8 Press the continue button to enter the code numbers and get the code description(s).