bvines18

Ive got another thread on this so Im basically wrapping all my issues into one:
This might get long but bear with me. I’m having problems with my 98 xj 4.0. Multiple problems and would appreciate any help y’all could give me. Just as a little background, I replaced the head gasket a couple months ago and drove it on a 300 mile roundtrip in a weekend. The only CEL code I get is P1694. I try to clear it, but that doesn’t seem to work. About a month ago, the battery was completely dead. I charged it overnight and nothing happened so I went and bought a brand new one. Jeep started up just fine. I was out of town for a few days and when I came back about a week later, the battery was dead again. I did a parasitic drain test and the fuse is F22 under the hood, amp meter showed 1.6amps. Removing the fuse reduced the current draw to very little. A chart shows this fuse is the fuel pump relay. Not sure where to start to look because when I bypass the actual relay by connecting pins 30 & 87, the pump runs. Fuse 11 in the junction box is good.
just to break up the story a little

The second issue is that it doesn’t start. Even with a fully charged battery (12.6v) it will crank but never starts, and I can’t hear the fuel pump running. I haven’t checked for spark because I’ve already pulled the CPS thinking it was bad. Ran a resistance test on the CPS and between B and C got about 16k ohms on the 20k ohm setting. Not sure if that means it works or not, especially because that test isn’t always conclusive. The fuel and voltage gauge do not move when the key is turned, with or without the CPS installed. Also, when I turn the key to on (not start) I would expect to hear the fuel pump turn on to get some fuel to the rail, and I don’t hear anything.

bvines18

edit: the code was p1694. i mistyped.

Radi

Have you tried swapping fuel pump relay with a different one?

You might find this thread useful:
https://www.cherokeeforum.com/f2/rep...94-code-97095/

bvines18

Today's excitement on this effort...
The orange wire from the PCM, black plug, pin A17, only shows .5V. This is still true after disconnecting all the sensors I could find.

bvines18

I disconnected most of the sensors and pin 17 (orange wire) continues to only carry 0.5V. So I cut the wire about a foot from the PCM, and it still only shows 0.5V, with the key on. Based on a few other postings, I feel a new computer is needed.
Does a 98 require the programming of the VIN and mileage?
What is a good source for them?

Also, there is resistance between pin B&C on the crank position sensor, i.e. not "infinite resistance". Based on a few other postings, I feel a new sensor is needed.

bvines18

A new crank sensor did not fix the issue; however, a junkyard computer fixed it! She started right up, kept the original odometer values.