Without Scan Tool

CHECK ENGINE LIGHT Pattern:

Turn the ignition switch ON, OFF, ON, OFF, ON and observe the CHECK ENGINE LIGHT. The CHECK ENGINE LIGHT should begin to flash a series of codes. The flashes will be separated by short an long pauses. The long pauses separate the "ones" and "tens" positions, and each code from the next. A code 55 will be displayed at the end of the test.

NOTE: The above information is provided to accommodate users who do not have the proper scan tool available. It should be noted, however, that in order to properly diagnose and repair these vehicles, the proper scan tool should be used.