Retrieving Codes
When the Check Engine warning light has been reported on, pull down the passenger's side carpet from under the dashboard, turn the ignition on, and observe the LED on the top of the ECU. The LED indicates a system failure code by blinking frequency. The ECU LED can indicate any number of simultaneous component problems by blinking separate codes, one after another. See Fig 1 .
See TROUBLE CODE IDENTIFICATION CHART . Proceed to appropriate code for testing. All voltage tests should be performed with a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless specifically stated differently in testing procedures.