immobilizer light flashing and now wont start

[MarkJordive]

Went out for the may run and the liberty worked great all day until I got stuck and had to do some heavy winching to get out . After that driving down the trail the guages kept turning on and off and the temp started climbing so next spot on the trail I could get pulled over I stopped and shut it off to let it cool . So after about and hour tryed to start it and it rolled over fine but wouldnt go . So I waited a little longer tryed it and still no kicking just rolled over so I disconnected the battery let it sit for 20 minutes and tryed again and nothing finally one of the local mechanics came by and we took out the asd relay and put a jumper wire in and got it started and drove it home but the battery boiled over in the process and now its running 14.9 volts at an idle installed new relay and still wont start. Im lost need help

 

[MarkJordive]

No body has any ideas

 

[LibertyTC]

When you were winching out was the KJ engine still running?
Sounds like something got overloaded....Boiled battery not good. Is there a new battery installed now? Use a load test on current battery...hydrometer on each cell?
I would want to get a good code reader plugged in and see what codes may be present.

 

[MarkJordive]

Ya the engine was running while I was winching. I replaced the battery sensor last night anded tryed it again still have to cross the asd relay to get it to start . it was putting out 18.5volts and burnt out my headlights as soon as I started the jeep . I took the alternator out and will take it to a shop to be tested today. The whole deal has me very confused . The little amber light on the dash is still coming on . Ive scanned it with my code reader a nd most times it comes up with a error message and when the asd is crossed it says no codes but lights up the yellow light

 

[tjkj2002]

Ya the engine was running while I was winching. I replaced the battery sensor last night anded tryed it again still have to cross the asd relay to get it to start . it was putting out 18.5volts and burnt out my headlights as soon as I started the jeep . I took the alternator out and will take it to a shop to be tested today. The whole deal has me very confused . The little amber light on the dash is still coming on . Ive scanned it with my code reader a nd most times it comes up with a error message and when the asd is crossed it says no codes but lights up the yellow light

The voltage regulator is in the PCM,not the alternator.I'd also look at the positive battery cable assembly going to the alternator and make sure the "trigger" wire for the alternator(from PCM) is not shorted to power.

 

[Billwill]

You need to plug a voltmeter into your front cigar lighter or power point so you can monitor the voltage while you are driving to see if it suddenly goes up.

I had this problem on my 2002 Export CRD whereby I could see that the voltage would rise up to about 17 volts whenever I turn on the front wipers or turned on the air con.

This caused a "ping" to occur and would power the Jeep down...also fried the battery.

I traced this to some wiring problems...probably damage caused to the wiring up front from an incident with a tree...I ended up replacing 5 wires all in.

I agree with tkj2002 to check the wiring going to the alternator but on the 2003 KJs this is not a "Trigger" wire but rather a pair of wires that carries varying voltage to power the field coil in the alternator. The one wire goes direct to +12 volts when the ignition is ON and the other wire goes to the PCM which switches this wire to ground in varying pulses, Pulse Width Modulation, to vary the period of the ground being sent to the alternator field coil. If this wire is shorted to ground then you get continuous 12 volts applied to the field coil and the voltage rises.

I also had a problem whereby the SKIS light stayed on solid and I had to jumper pin 30 and 87 in the ASD to get going. In my case it was because the one lead going to energize the ASD relay had broken so although the PCM (ECM for CRD) was happy with the SKIM signal from the chipped key...the ASD relay did not energize. In your case perhaps the ASD relay is not being energized because the PCM is not happy with something...maybe the PCM is picking up that the field coil is being energized full time as soon as ignition is turned ON.

I will have a look through the 2003 circuit diagrams to check which wire on the alternator should have +12 volts on it and which should be the varying ground....you can pull this plug off the alternator and with ignitio ON... one of the wires should show +12 volts while the other wire should be floating.

You could try disconnecting the battery and pull off the connectors to the PCM. Then apply a hair dryer to the connector and PCM contacts to dry them out.....do the same with the Alternator connector.

If you do not have the circuit diagrams for your KJ you can download the Service Manual for your year KJ here...includes all circuit diagrams..have fun!

Index of /manuals/Jeep/KJ

 

[MarkJordive]

You need to plug a voltmeter into your front cigar lighter or power point so you can monitor the voltage while you are driving to see if it suddenly goes up.

I had this problem on my 2002 Export CRD whereby I could see that the voltage would rise up to about 17 volts whenever I turn on the front wipers or turned on the air con.

This caused a "ping" to occur and would power the Jeep down...also fried the battery.

I traced this to some wiring problems...probably damage caused to the wiring up front from an incident with a tree...I ended up replacing 5 wires all in.

I agree with tkj2002 to check the wiring going to the alternator but on the 2003 KJs this is not a "Trigger" wire but rather a pair of wires that carries varying voltage to power the field coil in the alternator. The one wire goes direct to +12 volts when the ignition is ON and the other wire goes to the PCM which switches this wire to ground in varying pulses, Pulse Width Modulation, to vary the period of the ground being sent to the alternator field coil. If this wire is shorted to ground then you get continuous 12 volts applied to the field coil and the voltage rises.

I also had a problem whereby the SKIS light stayed on solid and I had to jumper pin 30 and 87 in the ASD to get going. In my case it was because the one lead going to energize the ASD relay had broken so although the PCM (ECM for CRD) was happy with the SKIM signal from the chipped key...the ASD relay did not energize. In your case perhaps the ASD relay is not being energized because the PCM is not happy with something...maybe the PCM is picking up that the field coil is being energized full time as soon as ignition is turned ON.

I will have a look through the 2003 circuit diagrams to check which wire on the alternator should have +12 volts on it and which should be the varying ground....you can pull this plug off the alternator and with ignitio ON... one of the wires should show +12 volts while the other wire should be floating.

You could try disconnecting the battery and pull off the connectors to the PCM. Then apply a hair dryer to the connector and PCM contacts to dry them out.....do the same with the Alternator connector.

If you do not have the circuit diagrams for your KJ you can download the Service Manual for your year KJ here...includes all circuit diagrams..have fun!

Index of /manuals/Jeep/KJ

thanks for the input i'll go through the wiring under the hood tonight and see if i can figure anything out . the alternator is still putting out a continuous 18.5 volts and starts boiling the battery as soon as you start the jeep if put power to the asd fuse it trips the relay and you can start the jeep and remove the power wire and it will stay running and no light on the dash from the skis..

 

[MarkJordive]

Still no luck can't find any wires burnt or anything wrong with the harness I'm going to put a external regulator on it so I can start driving it again .ill get back at it in about a week ill be away for work so hopefully with a fresh perspective and so more patience ill br able to figure it out

 

[Billwill]

Still no luck can't find any wires burnt or anything wrong with the harness I'm going to put a external regulator on it so I can start driving it again .ill get back at it in about a week ill be away for work so hopefully with a fresh perspective and so more patience ill br able to figure it out

Yeah a normal regulator may help overide the problem....the 2005/6 CRDs went back to having a standard regulator built into the alternator.

On your Jeep the PCM constantly monitors the battery voltage...on one of the "battery voltage" pins on the PCM...I am not sure which one.
The PCM then makes the appropriate adjustment of the alternator field voltage duration to keep the charge voltage up to around the 13.5 voltage mark while running. Your PCM may not be picking up this Battery voltage at all so the PCM panics and orders maximum voltage to the alternator field coils.

 

[MarkJordive]

installed a external regulator and now i'm getting a constant 14.3 volts and the jeep works perfect again except that i have to apply power to the asd fuse to get it to start once its going if you disconnect power it will stay running but the no key light comes on in the dash but if you leave power to it the light stays off and you can restart it at any time ???? not sure if the jeep forgot the key or whats happening any ideas

 

[Billwill]

installed a external regulator and now i'm getting a constant 14.3 volts and the jeep works perfect again except that i have to apply power to the asd fuse to get it to start once its going if you disconnect power it will stay running but the no key light comes on in the dash but if you leave power to it the light stays off and you can restart it at any time ???? not sure if the jeep forgot the key or whats happening any ideas

Which ASD fuse are you having to apply power to?

Fuse 6 or 26 in the PDC under the hood or fuse 15 inside the cabin?

I presume that you have recently swapped over the ASD relay!

 

[MarkJordive]

Fuse # 16 the asd feed under the hood

 

[MarkJordive]

Heres the fuse box the jeep deisels every on e and a while I imagine its from the asd being powered all the time

 

[Billwill]

Fuse # 16 the asd feed under the hood

That indicates to me that:
--The ASD relay is faulty or making bad contact inside the Relay socket...slightly bend the female contacts together inside the socket to give a better grip on the male pin of the relay.

--The Dark Green/Orange wire coming off of pin 87 on the ASD relay is supposed to find its way to Fuse 26 via the splice S121 that goes off to the Fuse 16 you are refering to....the connection from pin 87 to fuse 26 may be broken ..check it with an Ohm-meter.

--The ASD relay might not be energizing at all...check for +12 volts on pin 86 (Dark/Blue) and for Ground on pin 85 (Dark Blue/Yellow) at the time of starting the engine (and while running)...if one of these pins does not have the required voltage the relay will not energize and we need to trace why that is not happening. Chances are that pin 85 is not going to ground...the PCM is controlling this so either the PCM is not happy with something or there is a broken wire going from pin 85 to the PCM pin C3...this broken wire is what I had on my CRD.:shrug: