Recent content by b17gsr

Good to know. I’ll have to open it up and see what’s worn out. To be expected with that many miles.

Replaced the PCM and all the gauges worked. Fuel pump primes. Didn’t start on first few tries. Then I realized CPS was unplugged. Now it fires up and idles quite nicely!! Ignition sticks when turning it off, so that needs fixing.

Interesting how some systems work. Only time I’ve seen the fuel pump operate is when I bypass the relay. Planning to get a PCM and TCM tomorrow. Fingers crossed!

My first goal is to get the fuel pump to prime when the ignition is on... Seems like something is corrupting the CDD bus and preventing the PCM from doing its thing. I wonder if the 1694 was stored when I tried starting it with the TCM unplugged. Will have to clear code and check if it comes...

Also, switched the starter relay with ASD relay and results were the same. With ASD relay removed, voltage on pins 2 and 4 were battery voltage with ignition in on position.

Had a bit of time to do some troubleshooting, but too cold to do more this evening. Checked all fuses in PDC. All were fine (battery voltage on bother terminals), except two fuses F20-20A and F23-15A, which are controlled by the ASD relay The F20 and F23 fuses were only reading 2-3V while...

Yes, the inside fuse box is referred as the Junction Box in the FSM. I know fuse 11 is for the fuel pump and it was good when I was doing the testing. A sheet I found does mention power train control module as one of the devices connected to this fuse. I assume fuse 10 works, since the back up...

Will do. Fuses in PDC were fine, but will check again. Didn’t check all fuses in the Junction box, so got to verify all are in good order. After the recent snow, will be fun moving it away from the house to open the passenger door...

To summarize my ToDo list: Check for spark & power at ignitor Unplug all sensors and double check if there’s 5V on the sensor bus, and that the harness is intact. See if the 1694 error code disappears when unplugging the TCM, air bag module and other devices. Check if the CDD + and - bus wires...

Agreed. I even tried starting the engine with the TCM unplugged and no changes (Fuel pump didn’t prime). When plugged, the TCM is giving me a transmission solenoid error code, so thought it was operating well. I’ll have to check if I still get the 1694 code with the TCM unplugged (and The other...

We have NAPA Part stores around here as well. Good to know. I was going to change the fuel pump, but it works fine when relay is by-passed (good voltage and ground at harness near tank). The only reason the relay isn’t completing the circuit is the PCM isn’t giving it a ground signal. I didn’t...

Interesting info. The only code I could pull was 1694. At the DTC, read 2.41V between pins 3 - 5 and 11 - 5 with ignition set to run (battery voltage was over 12V during this test). With ignition in lock position and negative battery terminal disconnected, resistance between pins 3 and 11 was...

Thanks for the suggested debugging steps. First thing I tried was moving the relays around. I know the starter relay works, and any relay moved to that socket continues to crank over the engine. I did buy a new Mopar CPS, but haven’t installed it. With the existing CPS unplugged, no...

Hi all, New member with a new to us ride. This XJ currently does not start (does crank over) and has 370,000kms. When ignition is turned to on, only oil pressure gauge moves and odometer displays. Fuel pump won’t prime. Fuel pump works if relay is removed and wires shorted. After more...

Hi all, New here after recently picking up a non starting XJ as a project vehicle for my son. It’s a 1998 4dr 4x4 Sport, 4.0 with AW4. Here’s the debugging we’ve done to date (won’t bore you with things corrected to get to this point...): When turning ignition key to run, fuel pump does not...