...and we all know what happens when that happens--you go nowhere. I was talking to the guy, and this has happened about 4 times today.

Any known issues that one of you knows about?

5/11/2006 2:27:15 PM

what engine? 4.0, 5.2, 5.9?

5/11/2006 2:49:33 PM

My dumb ass didn't ask.

I'm presuming one of the sensor wires is grounding out intermittently. This was a brief over-the-phone conversation. The truck isn't in front of me, so I can't really do any troubleshooting.

The fuel pump has its own fuse/circuit, right?

[Edited on May 11, 2006 at 2:53 PM. Reason : one more question.]

5/11/2006 2:52:23 PM

yea, the fuel pump should be in a diff relay/circuit. there are a ton of things hooked up to that system/fuse. check the crank positioning sensor, and some ppl have had their 02 sensors get melted some and short out on the header and pop the fuse. could be a ton of things. i'm lookin for some stuff online for you.

is he getting spark at all? i had to replace mine and my engine would turn, but not fire at all, just a whirrrrrrrr of the starter

[Edited on May 11, 2006 at 2:55 PM. Reason : .]

5/11/2006 2:54:45 PM

You're the man. Thanks.

I dunno about the spark thing. He says the PCM/ASD fuse keeps popping and the truck just dies.

I presume it'll crank over, but I don't know if the fuel pump is running or not. If the PCM fuse pops, then there should be no spark and no signal to the fuel pump relay, and therefore no injection.

[Edited on May 11, 2006 at 2:57 PM. Reason : blahblahblah]

5/11/2006 2:55:57 PM

yup, when i did my swap that shit happened. what a pita. i hate electrical shit, yet it's intriguing at the same time. hope that helps.

5/11/2006 3:00:25 PM

Other than Cricket, who do you guys think would be good to work on this one?

I'm not taking it on because I have too much going on right now.

I have a friend or two at Cricket, but if anybody knows anywhere that's better for ZJ or WJ shit, speak up.

5/11/2006 3:05:25 PM

if he just needs a cps swap i can do that for him.

worked on extensively on my sis's old 96 zj and 99 wj, and have wj parts on my tj too

did his jeep throw ne codes?

[Edited on May 11, 2006 at 3:09 PM. Reason : .]

5/11/2006 3:07:52 PM

Don't know about codes...I didn't ask, and he didn't tell. This was per phone, out of the blue this afternoon. Though that would be of an immense help, wouldn't it?

5/11/2006 3:16:52 PM

yup. oh well let me know, i could do it today after 8:30 or tomorrow after 3 or so. quick service

5/11/2006 3:18:43 PM

for the codes you cant flash it with the iginition like the 97 and earlier, have to use a scanner

but it turns out being older than a 98

Cycle the ignition key On/Off/On/Off/On within 5 seconds. Then Count the number of times the "check engine" lamp flashes on and off.


Code Description
11 No crank reference signal detected during engine cranking. Intermittent loss of either camshaft or crankshaft position sensor. CKP sensor target windows have too much variation.
12 Direct battery input to PCM was disconnected within the last 50 Key-on cycles.
13 No difference recognized between the engine MAP reading and the barometric (atmosphere) pressure reading from start-up.
14 MAP sensor input above or below acceptable voltage. 5 volt output to MAP sensor open.
15 No vehicle speed sensor signal detected during road load conditions.
17 Engine did not reach operating temperature within acceptable limits. Engine does not reach 20º F. within 5 minutes with a vehicle speed signal.
21 Upstream oxygen sensor response slower than minimum required switching frequency. Upstream oxygen sensor heating element circuit malfunction. Downstream oxygen sensor heating element circuit malfunction. Downstream oxygen sensor input voltage maintained above the normal operating range. Oxygen sensor voltage too low, tested after cold start. (Upstream or Downstream) Left oxygen sensor input voltage maintained above the normal operating temperature.
22 Engine coolant temperature sensor above or below acceptable voltage.
23 Intake air temperature sensor input above or below acceptable voltage..
24 Throttle position sensor input above or below acceptable voltage. TPS signal does not correlate to MAP sensor.
25 A shorted or open condition detected in one or more of the idle air control motor circuits. Actual idle speed does not equal target idle speed.
27 Injector #3, and/or 4, and/or 5, and/or 6 output driver does not respond properly to the control signal.
31 An open or shorted condition detected in the A/C clutch relay circuit. Insufficient or excessive vapor flow detected during evaporative emission system operation.
32 An open or shorted condition detected in the EGR solenoid circuit. Possible air/fuel ratio imbalance not detected during diagnosis.
33 An open or shorted condition detected in the duty cycle purge solenoid circuit. (air conditioning clutch relay)
34 An open or shorted condition detected in the Speed Control vacuum or vent solenoid circuits. Speed control switch input below the minimum acceptable voltage.
35 Fan control relay
37 Relationship between engine speed and vehicle speed indicates no torque converter clutch engagement. Auto. only.
37 An open or shorted condition detected in the torque converter part throttle unlock solenoid control circuit. (3 speed auto RH trans. Only). Incorrect input state detected for the Park/Neutral switch. Auto. only.
41 An open or shorted condition in the generator field control circuit.
42 An open or shorted condition detected in the auto shutdown relay circuit. An open condition detected in the ASD relay output circuit. An open or shorted condition detected in the fuel pump relay control circuit. An open circuit between PCM and fuel gauge sending unit. Circuit shorted to voltage between PCM and fuel gauge sending unit. No movement of fuel level sender detected.
43 Peak primary circuit current not achieved with maximum dwell time.
43 Misfire detected in one or more cylinders 1 thru 6. (4 and 6 cyls.)
44 Battery temperature sensor in voltage above or below acceptable range.
45 Overdrive solenoid - open or shorted condition detected in overdrive solenoid circuit.
46 Battery voltage sense input above target charging voltage during engine operation. (voltage too high)
47 Battery voltage sense input below target charging during engine operation. Also, no significant change detected in battery voltage during active test of generator output circuit. (voltage too low)
51 A lean air/fuel mixture has been indicated by an abnormally rich correction factor. (O2 sensor)
52 A rich air/fuel mixture has been indicated by an abnormally rich correction factor. (O2 sensor)
53 PCM Internal fault condition detected.
54 No camshaft signal detected during engine cranking.
55 Completion of fault code display on Check Engine lamp.
62 Emissions Maintenance Reminder (EMR) triggered by mileage accumulator
63 Unsuccessful attempt to write to an EPROM location by the PCM..
64 Catalyst efficiency below required level. (Same as code 72)
65 Power steering high pressure seen at high speed. (2.5L only)
72 Catalyst efficiency below required level. (Same as code 64)
76 Fuel pump resistor bypass relay
77 Malfunction detected with poser feed to speed control servo solenoids.

5/12/2006 11:55:50 PM

it's a 98, said it in the title man. so he should be able to scantool the codes, if there are any, but i think he can still do the key on/off thing you described

5/13/2006 12:00:58 AM

if PCM fuse is popping its not gonna be setting any fucking codes. not any that mean anything.

5/13/2006 1:30:21 AM

Quote :

"for the codes you cant flash it with the iginition like the 97 and earlier, have to use a scanner but it turns out being older than a 98 Cycle the ignition key On/Off/On/Off/On within 5 seconds. Then Count the number of times the "check engine" lamp flashes on and off"

Thanks for the advice and all, but I been pulling codes on MoPars since Jesus drove one.

Looking for known issues. Not advice on how to troubleshoot. This truck ain't even in my possession and most likely won't be.

5/13/2006 2:53:15 AM

So it turns out that this truck will be in my possession Wednesday.

And it's a '93 ZJ with a 5.2.

Anyway, maybe I need to hit up 69 for wiring schematics...

5/30/2006 12:47:17 AM

ive got a fsm if that helps

5/31/2006 12:32:43 AM

^^ i'll pull some stuff up for ya tonight

5/31/2006 1:32:09 PM

Talk about conflicting info. I was told '98 to begin with, then '93, and then I find out when I get to it that it's a '98 after all.

No big deal. This one turned out to be a walk in the park. Looked on the topside, nothing out of place. Cranked 'er up, wiggled the wiring harness in all the obvious places, nothing. Crawled underneath, looked at the pre-cat O2 sensor harness, all fine. Then I take a look back and see the post-cat O2 sensor harness...lying across the top of the driveshaft.

I looked at it closely, and sure enough, the driveshaft had rubbed through one of the O2 heater wires, shorting it out. Every time the truck would hit a bump or come to an abrupt stop, the PCM fuse would blow when the bare wire made good contact with the shaft.

While the truck was running, I pushed the harness against the shaft, blew the fuse, and killed the engine. One butt connector, one piece of heatshrink tube, a zip tie, and a new fuse later, everything's cool.

I love quick and easy electrical fixes. They never seem to happen.

6/1/2006 1:20:48 PM

^ if you had a dealership you could have charged him like $400 for that

6/4/2006 9:46:54 AM