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Need to
know why that Check Engine light on the dash is glowing?
The light will remain lit until the problem is corrected
and the code is cleared. The codes below give an
indication of the type of failure(s) and can be
extracted using a SCAN tool.
However, by doing an ignition key
dance, you can place your 91-95 YJ into its diagnostics
mode and extract the trouble code(s) from the PCM via
flashes of the Check Engine light.
Perform the following steps to
extract the code(s):
-
Without starting the engine, turn the ignition key
ON, OFF, ON, OFF and ON. The Check Engine light on
the dash will begin to flash.
- If any trouble codes
are stored in the PCM memory, the CHECK ENGINE light
will flash the number of the first digit, pause and
flash the number of the second digit. For example,
Code 51, Oxygen sensor - lean condition would be
indicated by five flashes, pause, and one flash. A
long pause will appear between individual codes if
more than one code is present. Carefully observe the
flashes and record the code.
- After the stored
codes have been indicated (or if everything in the
self diagnosis system is functioning properly), the
Check Engine light will flash a Code 55.
- If the ignition key
is turned OFF during the code extraction process and
possibly turned back ON, the self diagnostic system
will fail and must be restarted.
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