http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service
which engine, why not post engine your fixing.??????
chapter emissions...... cht.25
see that? then go to 36 code
page 3.
oxy 1/2 heater relay problem.
then page 19 explains the tests.
1/2 means the down stream 02
and the PCM tests the relay.
and fails.
so a fuse is blown or the relay is bad. is my guess.
fuse 10 or 17?
on car i dont guess, test the relay in place.
the Fsm does not tell you , how this is checked.
does the PCM monitor the coil pin, or the output pin of the relay.
wiring page 135 (pdf page) shows the wiring
my guess is the PCM watches the relay coil, and if not 12vdc
disabled. the coil is open or fuse blow, or as is true ,endlessly
wires bad, or bad connectors.
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