Car died, fuel pump whining - Page 2 - JeepForum.com
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post #16 of 30 Old 11-05-2015, 04:52 PM
ZeeJay1997
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Disconnect the crank sensor and see if the fuel gauge and CEL at key on start working. If that doesnt work, reconnect crank sensor and do the same for the cam sensor.



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post #17 of 30 Old 11-05-2015, 05:02 PM Thread Starter
jeepas
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Quote:
Originally Posted by ZeeJay1997 View Post
Disconnect the crank sensor and see if the fuel gauge and CEL at key on start working. If that doesnt work, reconnect crank sensor and do the same for the cam sensor.
Is the CEL (Check Engine Light?) supposed to light up when I switch the key?
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post #18 of 30 Old 11-05-2015, 05:07 PM
ZeeJay1997
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Yes. Click the link in my sig and read the no start section.


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post #19 of 30 Old 11-09-2015, 03:59 PM Thread Starter
jeepas
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I didn't have time to research how to test the camshaft and crankshaft sensors yet, but I did do the quick OBD-II test. I've got a Bluetooth OBD-II device, I've used it quite a few times on the ZJ, but this time it didn't connect!

Grounds for a PCM replacement?

Other than that, I made a video of the no-start:
(turning the headlights on is to disable the kill switch)
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post #20 of 30 Old 11-09-2015, 06:42 PM
ZeeJay1997
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Quote:
Originally Posted by ZeeJay1997 View Post
Disconnect the crank sensor and see if the fuel gauge and CEL at key on start working. If that doesnt work, reconnect crank sensor and do the same for the cam sensor.
x2


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post #21 of 30 Old 11-09-2015, 06:58 PM
ZeeJay1997
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There are a lot of things can cause the problem. It's pretty common for something external to the PCM to short and disable the circuits in the PCM. Sometimes the short has it temporarily disabled and sometimes it damages the PCM. Luck of the draw.

Already told you 2 of them. Other things to check.

Fuse 20 in the PDC, is it blown?
O2 wiring and harness up to the engine bay, is it damaged?

See the list of stuff under cause #2 that are common causes of misdiagnosis.

Or go buy a PCM and stick in there and hope the Jeep doesn't destroy it.


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post #22 of 30 Old 11-09-2015, 07:38 PM Thread Starter
jeepas
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Ok. I did get an O2 sensor warning code a month or so back. It was the second sensor if I recall correctly.

Thank you
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post #23 of 30 Old 11-12-2015, 04:48 PM Thread Starter
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OK so today I did the thing that I should have done at the beginning - checked all the fuses. Oops! Fuse 20 was blown just as you said!

Car now runs. BUT it blew twice in the next 5 miles of driving :\

From the FSM:

"When the PCM grounds the ASD relay, contacts inside the relay close and connect circuit F5 from fuse 20 in the PDC to circuit A142. Circuit A142 splices to the generator field terminal, fuel injectors, ignition coil and the upstream and downstream heated oxygen sensors. Circuit A142 also connects to cavity C12 of the PCM."

Another pointer than those O2 sensors - will check those next. I understand (and please correct me if I'm wrong) that backprobing them doesn't give a great result because the voltage fluctuates too fast. But I do have that Bluetooth OBD-II reader so maybe that can tell me if the sensors are giving normal readings - will check.

Anything other pointers at this point?

Thank you!
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post #24 of 30 Old 11-12-2015, 05:27 PM
ZeeJay1997
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Quote:
Originally Posted by ZeeJay1997 View Post
O2 wiring and harness up to the engine bay, is it damaged?
Most common cause of blown fuse 20. Just need a bright light and good eyeballs


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post #25 of 30 Old 11-14-2015, 11:19 AM Thread Starter
jeepas
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OK so I found the cause of the downstream O2 sensor fault code - 2 wires are broken!

Should the harness be anchored up to the body? It's hanging loose and it looks like the driveshaft might have sheared the wires. I'm going to try soldering them. I can't see how to anchor it up out of the way though :\
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post #26 of 30 Old 11-14-2015, 12:54 PM
ZeeJay1997
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If it were mine I would install a new sensor. It appears that the damaged wire is on the leads from the sensor rather than the harness. But if you decide to repair it use a splice and solder with high temp heat shrink tubing. And there should be a clip on the frame rail that secures the harness.

For now, disconnect the sensor, replace fuse 20, and check if the PCM starts working again.


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post #27 of 30 Old 12-08-2015, 11:24 PM Thread Starter
jeepas
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Jeep's been rolling absolutely fine since I replaced fuse 20. The fuse never blew again in a few hundred km of being driven in the city, mountains and dirt track.

Amazingly, the electrical leak that has plagued my car since I bought it has disappeared! I have absolutely no idea why.

Plus, cleaning the fuel tank fixed the stalling problems and changing the dist cap fixed the long crank time to start. And I learned more about car mechanics and electrics than ever before

But the electrical leak disappearing, I just cannot get over lol

Thank you for all your help!
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post #28 of 30 Old 12-09-2015, 04:16 AM
ZeeJay1997
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Fix the wiring. It will bite you in the ***.


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post #29 of 30 Old 12-09-2015, 04:51 AM
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x2. Just about the first thing I repaired on the jeep,after it took out the pcm.

Info on projects and repairs categorized by system

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Originally Posted by HighLonesome
lol...if life is as a simple as a 5.9 making you happy, I'd say go ahead and buy it on impulse. ZJs are the way of Zen. Wax on, wax off
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post #30 of 30 Old 03-03-2016, 01:24 PM Thread Starter
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Jeep's retiring as a trail truck.

New one's a WJ. Beautiful and crazy powerful, but the ZJ has so much character
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