Displaying & Reading Trouble Codes

Check Engine Lamp:

A stored diagnostic trouble code (DTC) can be displayed by cycling the ignition key ON-OFF-ON-OFF-ON within three seconds and observing the malfunction indicator lamp. This lamp was formerly referred to as the check engine lamp. The lamp is located on the instrument panel.

EXAMPLES:

- If the lamp flashes 4 times, pauses and flashes 1 more time, a diagnostic trouble code (DTC) number 41 is indicated.
- If the lamp flashes 4 times, pauses and flashes 6 more times, a diagnostic trouble code (DTC) number 46 is indicated.
- If the lamp flashes 1 time, pauses and flashes 2 more times, a diagnostic trouble code (DTC) number 12 is indicated. If the sequence of codes begins with a DTC number 12, this indicates direct battery input to the Powertrain Control Module (PCM) was disconnected within the last 50 key-on cycles. Old codes may have been erased.

After any stored DTC information has been observed, the display will end with a flashing DTC number 55. This will indicate the end of all stored information.

If the problem is repaired or ceases to exist, the PCM cancels the DTC after 51 engine starts.

Diagnostic trouble codes indicate the results of a failure, but never identify the failed component directly