Alright guys this is where I need your help. Here is the skinny on the problem, when we bought my truck two years ago the check engine light was on. It kept reading mis-fire. We did everything we could think to fix it but the engine didn't have time to wait and it blew up. We replaced it with a newer used motor that has given me no trouble thank the lord!! The check engine light is still on and the engine was replaced about a year ago now. I finally got it scanned at Autozone like 10 minutes ago and it reads code P1309, on the Autozone computer system inside it say's this

"misfire monitor aice chip fault
monitor disabled

The engine runs like a champ but this check engine light is killing me in more than one way, I believe the computer is faulty or something along the lines, can anyone help me. I am gonna research the aice chip online but I trust you guys more than anyone else when it comes to these trucks. You know as always it is greatly appreciated, Blades

P.S. newer used engine is the same, 4.0L OHV V6

 

did you reset the computer when you replaced the engine? what you can do is to remove the negative side of the battery and let it set for about 10 minutes....then put the negative back on and start it.....if the check engine light comes back on, then you have to worry about the problem....if it doesn't it is because you needed to reset the computer...

 

Yes, I am no rookie to this damn light lol, the computer has been reset numerous times and the light continues to come back on, actually twice last week. What gets me is that the engine runs fine, no mis-firing, no hesitation etc.

 

then i can't help ya there.....i would suggest waiting for Bob or John to chim in...

 

Bob save's me everytime lol!! He's like Superman or something......

Thanks for tryin though, appreciate it bud!!

 

I could be wrong... but I think P1309 is a camshaft position sensor code, so I would try and test that sensor with a multimeter or something or if it isnt too expensive get a new one and see what happens.

 

This is what I found on a fellow forum site but I don't understand this jibber jabber, help? This code is from a Explorer 5.0L engine and the response was meant for that vehicle, maybe it is different for my case.

HD40 CHECK CMP SENSOR OUTPUT

Diagnostic Trouble Code (DTC) P1309 indicates Misfire Detection Monitor is not enabled.

Breakout box installed, PCM disconnected.
Connect digital multimeter between PCM test pin 85 and test pins 51 or 103.
Bump engine in short burst with the starter without starting engine for at least 10 engine revolutions.
Does digital multimeter reading switch between low (less than 2.0 volts DC) and high (greater than 8.0 volts DC)?

Yes
Note: A Hall effect type CMP sensor that is installed out of synchronization will produce a DTC. VERIFY the correct installation by referring to the Powertrain/Engine Group in the Workshop Manual. If the CMP is installed properly, REPLACE PCM. RESTORE vehicle. RERUN Quick Test .

No
REPLACE CMP sensor. RESTORE vehicle. COMPLETE Misfire Monitor Repair Verification Drive Cycle. RERUN Quick Test .

 

Diagnostic codes are standard so they apply to everything as long as it has those parts, the breakout box is something that the Ford dealer is going to have..

Pretty much the only way you will be able to test that sensor (assuming you have one, being a 2000 I'm 99% sure you do) is to use a multimeter set to test voltage, and have a buddy crank the starter, without starting the motor, and watch for voltage between the recomended 2 and 8 DC volts.

If it goes above or below the recommended specs then you have a bad sensor and it needs to be replaced.

You could also use some electrical cleaner and make sure the connector is clean and installed correctly.

 

I looked up the sensor on Autozone and they have it listed at $29.99, and it should be located behind the rear of the intake manifold in the engine block.. if that helps you out..

 

I appreciate the help I also looked it up on Autozone and I believe that I found it where it is supposed to be, its a PITA getting the connector off but I did after 30 minutes and nothing seemed to be wrong, I put some dialectic grease on it and plugged it back in, we will see if it comes back on but from everything I have read on other forums it seems that when this code occurs it really never goes away, I'm unhappy. And it looks like to me in order to replace that sensor or recalibrate that stuff back there you either have to unbolt the motor mounts and rock the engine forward or take off the intake manifold. I hate working in places I can't see.

 

That does suck, so hopefully you have better luck then everybody else.. If its really that hard to get off I would want to be 100% sure its bad before replacing it or trying too, but I would never be satisfied driving a truck with a constant CEL, and with it always on you will never know if something else is bad unless you check for codes constantly..

Good luck, I hope it turns out well for you and your truck.. maybe someone else will have some better info for you..

 

Thanks man, much appreciated!!

 

If all else fails, take the bulb out of the check engine light..LOL

 

P1309: Misfire Monitor Hardware
CMP misaligned
CMP/CKP noise
PCM AICE chip

I don't know much about this but I'll give it a shot.

The AICE chip could be at fault and that would require a new PCM. My gut feeling is that your code is more likely due to a problem with the Camshaft Position (CMP) sensor.

The CMP sensor on a 4.0L OHV fits into a hole where you would find the ignition distibutor on an earlier engine. The sensor gear must be timed to the camshaft just like a distributor, too. Ford dealers have a synchronizing tool that sets the CMP to the correct position.

Since you have a used engine, there's no way to know if the timing of the CMP has ever been disturbed. And, until you test it, you won't know if the voltage readings are within spec.

Also, the drive shaft to the CMP runs in an aluminum housing that does not have pressure lubrication. This usually works OK but sometimes the shaft and housing wear, especially at higher miles. There may be a chirping sound at idle when this happens but not always. If you get it opened up, you should check for side clearance of the shaft within the housing.

 

Thank you Bob, I got the connector off of the CMP today but I have no way to get my eyes back there to see what it is that I am dealing with. The Hayne's manual says there are two bolts that must be removed in order to pull the CMP off. It can be replaced with a new one without disturbing the rest of the CMP area but my problem is I am blind with no room to work. Would I need to take off the intake manifold in order to address the area in question? If so would that require, what, new gasket, etc. I don't have much exp. in engine work but I would like to do it myself for the knowledge, and I am very low on money currently. I will look into it all more soon, it will be a little while before I can afford the CMP, and I have heard the tool can get costly as well. Thanks again!! Ben

 

Before you do anything, I believe there may have been a Tech Bulletin on that a while back, it applied to '99 or 2000 4.0L Rangers. There may be a factory fix for that code. Call your local dealer to check, they should be able to tell you.
I think the TSB was a 13437, but I'm not sure, I'm not at my main computer now.

 

Where would one look for such a thing?@?@

 

The test you posted is the same for a 4.0L OHV, even the pin #s match up. The objective is to measure the voltage between the CMP signal (pin 85) and PWR GND (pin 51 or 103) circuits at the PCM harness connector with the engine cranking. Note the PCM harness connector is to be disconnected for the test.

There is another test of the CMP output with the PCM still connected and engine running:

CHECK CMP SENSOR OUTPUT — PCM CONNECTED

Connect PCM.
Connect digital multimeter.
Start engine and vary engine RPM.
Measure voltage between CMP and PWR GND circuits at the PCM harness connector.

Does AC voltage vary greater than 0.1 volt AC?

Yes
VERIFY the correct installation by referring to the Electronic Engine Controls, Section 303-14 in the Workshop Manual. If CMP is installed properly, REPLACE PCM (refer to Section 2, Flash Electrically Erasable Programmable Read Only Memory (EEPROM) ). COMPLETE Misfire Monitor Repair Verification Drive Cycle. RERUN Quick Test.

No
REPLACE CMP sensor. COMPLETE Misfire Monitor Repair Verification Drive Cycle.

(Note that you are measuring AC here, not DC as in the other test).

 

Thanks for the info Rockledge, I will be busting into this fix real soon, I will let you all know how it goes!!

 

FYI - if you are to remove the CMP, it does require removal of the intake. The screws that are holding it in are in this position:



hope this helps some.

 

I appreciate your help but the pic is a nice red x. I hope that this thread will help in the future searches for others because so far it has alot of good info. When I get the finances to tear into this I will make sure to let you all know how it goes, maybe me and whoever helps will make a how to for future endeavors!!

 

LOL it sure is... umm anyone on AIM? Send me a IM at INVADERSMN and I can send you the image for you to post it for me.

THANKS!