Displaying & Reading Trouble Codes

To start this function, cycle the ignition switch ON-OFF-ON-OFF-ON within 5 seconds. This will cause any DTC stored in the PCM memory to be displayed. The malfunction indicator (Check Engine) lamp will display a DTC by flashing on and off. There is a short pause between flashes and a longer pause between digits. All DTC's displayed are two-digit numbers, with a four-second pause between codes.

An example of a DTC is as follows:
1. Lamp on for 2 seconds, then turns off.
2. Lamp flashes 4 times pauses and then flashes 1 time.
3. Lamp pauses for 4 seconds, flashes 4 times, pauses, then flashes 7 times.
4. The two DTC's are 41 and 47. Any number of DTC's can be displayed, as long as they are in memory. The lamp will flash until all stored DTC's are displayed, then it will flash a DTC 55 to indicate the test is complete.