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Cameldog 04-29-2013 09:10 PM

Need Help Replaced fuel pump-Now getting codes 22 & 17
Last week my 1997 4 cyl Wrangler just quit going down the road. Towed it to a friends house and determined i had spark and power going to the fuel pump, but no fuel pressure. Replaced the pump. I did not have a check engine light or codes before the fuel pump quit.

Now I am getting a check engine light. The temperature gauge moves from just below the lowest line on the cold side to about 1/8" to just above it when I turn on the key. The temp gauge worked properly before the fuel pump quit. Getting Codes 12, 17, 22, 55. I disconnected the battery so I can understand the 12 code and the 55 code.

12 - Direct battery input to PCM was disconnected within the last 50 Key-on cycles.

55 Completion of fault code display on Check Engine lamp.

22 Engine coolant temperature sensor above or below acceptable voltage.

17 Engine did not reach operating temperature within acceptable limits. Engine does not reach 20º F. within 5 minutes with a vehicle speed signal.

Seems odd that all this happened at one time.

I replaced the coolant temp sensor at the thermostat housing and still get the codes. I have continuity in the wires. The engine warms up and runs normally.

The Temp gauge sending unit at drivers side rear of the head is broke off and there is no wire anywhere to connect to a new one. It appears to have been broke for a long time.

I should add my Jeep had a rebuilt engine when I bought it and the harness appears to be a 1998 or later because the 1997 coolant sensor would not fit. I had to get a 1998-2003 sensor to fit the harness.

There is also a little 1" x 1" plastic box with two wires that are spliced into the two wires going to the coolant sensor at the front of the engine. I have no idea what this is for. There are no identifying markings on it.

I have done extensive searches trying to figure this out to no avail.

1. Anyone have any idea what the little box spliced into the coolant temp sensor harness is?

2. Since I replaced the coolant temp sensor, where else should I look to resolve the 22 code? I suspect the 17 code will go away once the 22 code is resolved.

3. What color is the wire that goes to the temp sending unit at the rear of the engine and where in the harness should I look for it?

Thanks for your help!!

Cameldog 04-30-2013 05:26 PM


BlackTJ94 05-02-2013 01:14 AM


Originally Posted by Cameldog (Post 3702651)

Im sorry I don't have the winning answer. But since it's a rebuilt engine something may have gone haywire. I would just take it to a local shop and have them look and it and tell you what's wrong. And if you decide to you can fix it yourself.

Cameldog 05-25-2013 07:57 PM

Ok, I gave up and took it to a shop. One of the wires going to the temperature sensor had a break in it right at the connector. The wires going to the sensor were bent at a 90 degree angle after coming from across the intake to plug into the sensor. Apparently, when I took the connector loose from the sensor to check continuity, I straightened the wire out and the two broken ends made contact. When I bent the wire back over to plug it back on to the sensor the broken wires did not touch.

$100 later I'm back on the road with no codes.

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