key code 27 on my project xj

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Nov 13, 2010 | 10:20 PM

limegreentj

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Joined: Apr 2010

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Model: Cherokee

key code 27 on my project xj

i finally got the thing to idle pretty well, went to the yard and got a map sensor and IAC and it sat and idled fine, put it in drive and it stalled out, when it stalled out the check engine light was on, so i flashed the key code and got 12 (battery unhooked) 27 (Injector circuit isn’t switching when it’s told to (TBI)
OR (MPI) injector circuit #1 not switching right
OR (turbo) injector circuit #2 not switching right
OR (all 1990-) injector output driver not responding
- check computer, connections)

im thinking bad fuel injector? or could it be something else? im getting closer...haha.

Nov 14, 2010 | 08:34 AM

limegreentj

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Model: Cherokee

ok, so i let the dogs out in the yard and pissed with the jeep a little more, i did the key trick to make sure the code was correct, when i did it, after the key was turned forward, the fuel pump kept clicking on and off every couple seconds, the relays under the hood kept clicking, and it seemed like the 1 fuel injector was clicking, i pushed on the connector, and the clicking injector stopped, and the cycling fuel pump slowed to every 10 seconds, in sync with the relays, but no more clicking from FI

Nov 14, 2010 | 04:36 PM

limegreentj

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Model: Cherokee

heres a video of what is happening

Nov 14, 2010 | 05:28 PM

phoenix901223

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Joined: May 2010

Posts: 406

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From: Suffolk long island

Year: 1994

Model: Cherokee

Engine: 4.0 L I6

bad relay? swap it with the fan relay im pretty sure there the same..

Nov 15, 2010 | 10:22 PM

limegreentj

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Model: Cherokee

but if it was a bad relay, wouldnt the fuel pump not work at all?

Nov 15, 2010 | 10:28 PM

mwdouglas

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Joined: Feb 2010

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From: gloucester va

Year: 1990

Model: Cherokee

Engine: 4.0

not if the relay is not blown but worn out to were its not opening enough to completely open the electrical circuit

Nov 16, 2010 | 11:13 AM

phoenix901223

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Joined: May 2010

Posts: 406

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From: Suffolk long island

Year: 1994

Model: Cherokee

Engine: 4.0 L I6

X2^^ my fan relay decided to work on some days and not on others and sometimes intermittently. since I live up north it doesnt get too hot, the only time i really need it is summer on the beaches in 4x4