1st jeep dies - JeepForum.com
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post #1 of 35 Old 09-19-2020, 03:41 PM Thread Starter
carrerajason
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1st jeep dies

I aquired a 2002 tj 4.0. It didn't start and suspected the asd relay. I have it and fuel pump bypassed on toggle switch.

It will start and run great for about 8 seconds before in begins to miss and then dies.

I bought a new cam sensor and tested the crank sensor. The crank read 5 .13 volts in and 5 volts out . Strange I didn't have to bump the motor at all to get the 5 volts out.

I understand the asd gets its info from these 2 above sensors. Then from these it will shut off fuel spark ect .

If the sensors are good then what's my next step? The jeep (with asd bypassed) starts and runs smooth for about 8 seconds then begins to shake back and die.





I

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post #2 of 35 Old 09-19-2020, 03:45 PM
mukluk
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Check your fuel pressure with a gauge, it should read 49 +/- 2psi at the rail.

2000 TJ SE
2005 LJ Rubicon
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post #3 of 35 Old 09-19-2020, 04:03 PM
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[QUOTE=carrerajason;41076811
Strange I didn't have to bump the motor at all to get the 5 volts out. I understand the asd gets its info from these 2 above sensors. Then from these it will shut off fuel spark ect .I[/QUOTE]


Logic is a little flawed, but first lets look at

what Mukluk suggested FUEL pressure. use a gauge often a loaner or rental at auto oart stores.

tell us does your jeep have security light on if applicable?

Did you try to get codes- a code reader or best is a scanner.

Is jeep power train STOCK?

Do you have a test light and comfortable with doing electrical testing and can you read wiriing diagrams?
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When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #4 of 35 Old 09-19-2020, 05:16 PM Thread Starter
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Yes I got 12 codes...lol.

The power train is stock. What I know about the jeep.

The guy had it and a cj5 in his yard. They had sat for 4 years. He would start them on a reg basis. This one I got he said he parked cause the bearings sounded bad. He would start every so often . He noticed a 0340 code..and next time it wouldn't start.

So far I changed the cam sensor. I multimeter the crank sensor orange at constant 5.13. Then moved to the grey wire and got same reading. I didn't turn the engine.

It runs longer each time I start it. It's up to about 45 sec.

As it dies it begins to suck in a lot of air and the tail pipe exhaust pressure goes up. I had checked the tailpipe because it seemed to have same symptoms as a clogged cat converter and I figured a creature may have made a home in it.

Here is the list of codes l have

0031
0032
0443
0353
0352
0351
1389
0051
0052
1495
0136

And one more issue....the odometer stays on
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post #5 of 35 Old 09-19-2020, 05:41 PM
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I always thought that the only thing that would cause the death of a Jeep was rust or an accident. After seeing your code list I may have to rethink my belief.

Some people just call me Doug.
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post #6 of 35 Old 09-19-2020, 05:48 PM
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lets start breaking this down, we can pair several issues.
o2 heater circuits, ign coil, and that ASD relay.

ALL o2 heater circuit
P0031-1/1 O2 SENSOR HEATER CIRCUIT LOW
P0032-1/1 O2 SENSOR HEATER CIRCUIT HIGH
P0051-2/1 O2 SENSOR HEATER CIRCUIT LOW
P0052-2/1 O2 SENSOR HEATER CIRCUIT HIGH
P0136-1/2 O2 SENSOR HEATER CIRCUIT MALFUNCTION

Ign COIL issue
P0351-IGNITION COIL #1 PRIMARY CIRCUIT
P0352-IGNITION COIL #2 PRIMARY CIRCUIT
P0353-IGNITION COIL #3 PRIMARY CIRCUIT

Maybe your wiring ?
P1389-NO ASD RELAY OUTPUT VOLTAGE AT PCM

EVAP codes. lets back burner these,
P1495-LEAK DETECTION PUMP SOLENOID CIRCUIT
P0443-EVAP PURGE SOLENOID CIRCUIT


We need to make a plan - and too much bourbon will need me to say tomorrow...
Tools = test light, fuel pressure gauge. exhaust back pressure gauge. Any available?
What spark plugs are in this engine, how do they look?
Avoid knee jerk solutions.

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #7 of 35 Old 09-19-2020, 05:54 PM
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Between being parked in a yard for four years and that list of codes, I'm thinking that Jeep has been turned into a rodent hors d'oeuvre...

2000 TJ SE
2005 LJ Rubicon
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post #8 of 35 Old 09-19-2020, 06:05 PM Thread Starter
carrerajason
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I've gone over wires with magnify glass. Guess I'll throw some pics so y'all can see what I'm working with.

Hand Tools I have are endless , meters and such not so much but I can get them.

I'm not afraid to spend a lil.....I got this for... Well...let's just say I could put 9g into it And still come out like a rose.
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post #9 of 35 Old 09-19-2020, 06:07 PM Thread Starter
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Came with hard top soft top n doors and other good
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post #10 of 35 Old 09-20-2020, 12:55 AM
jtec
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My thinking is -
there is nothing wrong with ASD, and that fuel pump circuit tests* were not done.
What made you think fuel pump and or ASD relays were an issue?
Tell us about the wiring you did for the fuel pump and ASD. A drawing but thats asking alot.

Do you know if the jeep is Federal or California emissions, there should be a decal on radiator support to ID system- dont guess let us know if your not sure -



*TMI the ASD RELAY does NOT power your fuel pump.

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #11 of 35 Old 09-20-2020, 10:09 AM Thread Starter
carrerajason
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From what I've read and heard the asd shut off coils fuel.

What I did to bypass was connect slot 30 and 87 on both asd and fuel pump.

From what I've read the cam and crank sensors are the 2 that control the asd.

If I don't bypass the asd, it just cranks....no start.

What's weird is it starts with asd bypassed and runs smooth for now for about 45 sec then becomes jerky and finally just dies. It will restart immediately and do the same. Each time it runs longer.

I'm thinking one of either the cam or crank are faulty and may begin to screwup after some amount of cycles. The misfire that begins to happen maybe the culprit of the o2 readings as emission is rich from unburnt raw fuel is dumped thru the exhaust due to misfire.

I'm trying to find someone around laffayete louisiana that specializes in jeeps. The engine runs great , so I believe it'sa simple fix of some kind of some kind sensor maybe the pcm.
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post #12 of 35 Old 09-20-2020, 10:47 AM
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lets try this - remove jumper in PDC.

look at attachment diagram of PDC, jeep to confuse things has changed the cavity numbers, your jump of 30 to 87 is seen in diagram as 14 to 15 - understand?

We are going to check ASD -
SO with key in RUN* -
1) is there 12v at 13 and 15?
2) is 11 grounded.

Tell us what was result to question 1 and 2 above.


* NOTE jeep PCM logic is that if engine does NOT start in 3seconds it will shut OFF relays.
This makes checking relays (ASD Fuel) tricky suggest a 2 man operation.








remove the jumper wires in the PDC, get a test light.

Look at the attached diagram of the PDC, jeep just to complicate this, changed the cavity numbers. We are looking at ASD first.
what you referance as 30 and 87 is # 14 and 15. got it?
What we will need to look at is with key in RUN*
is there 12v at 15 and 13?
Is there a good ground at #11?


* jeep (PCM logic) will shut down relays if the engine does NOT start in @3seconds SO a 2 person job is advised.
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PDC cavitys.jpg  

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #13 of 35 Old 09-20-2020, 10:49 AM
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IDK why it double posted - is that confusing? I will try to clear it up if you need.

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #14 of 35 Old 09-21-2020, 02:07 PM Thread Starter
carrerajason
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Ok.....

So I have 12.52 at #15
12.50 at #13.
.
Note....I left my key to on and checked before and after the 3 seconds.... Readings the same




At 11 with my meter on 20k ohm....it o.oo when touch red and black together but 8.43 when I neg battery and red wire to #11
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post #15 of 35 Old 09-21-2020, 02:51 PM Thread Starter
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All my grounds for horn starter ect read 8.43
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