Do you have a check engine light?

 

Sounds like something isn't happening with the computer or someone removed the bulb to sell the car. You should see it on start up and then disappear. That should happen every time you start. It also should through codes becasue the "not ready" tells me the ECU is receiving no information from them.

 

sounds like you need a ECM they are expensive and do fail due to water entry.... what exactly are you falling in your inspection?

 

Hi guys,

I am the OP, who had to make a new account because I forgot my password, and recovering it was not working for me. I tried to contact the admin, but had no luck. Sorry to make a new account and bumping this old thread. Mods/ admins please PM me if there is an issue.

Anyways, just wanted to say after 3 years+ I STILL have not found a solution to this problem. No dealer, including jaguar really knows the issue. Like I said, when trying to read the codes, I get a simple "code not ready" thus failing the inspection immediately.

If anyone has any information on what this could be let me know. I tried looking into the ECM, but I couldn't find much on the part online.

Thanks again

 

3 years! Did you find out if indeed the check engine light had been removed?

 

No check engine light is there, it is just off. There is no codes for light to come up because the computer is still saying "code not ready"

With no codes ready, there won't be any codes to throw the light on.

Yes, sadly it has been 3 years. Each time I have to go through a process of obtaining a waiver because I can't renew my registration without passing the inspection (which takes proof of $ spent trying to solve the problem and weeks/months of waiting)

 

Bump? I plugged in obd2 reader and it passes the codes, but the those monitors are still not ready/inc! Also I got a message that MIL is off....

 

You need to find someone knowledgeable about OBDII and the continuous and non-continuous monitors that will not run. For instance a failed O2 sensor will prevent the catalyst monitor from ever running because it needs the O2 sensor to do it. Also, the Check Engine light circuit must be traced to find out why it doesn't come on with the key on and engine not running. The ECM has circuitry to monitor the lamp, and it is possible the monitors won't run because it knows it can't alert you if they did find a fault!

I know that may sound crazy, but that is the logic used by the ECM.

Good luck!

 

Thanks for the insight. I did perform drive cycle and still have the not ready codes. I'll look into the check engine light, but I don't believe it will turn on because there no codes reported by the obd2 code reader when I plug it in. Just under i/m monitors i get these 4 not ready codes.

I just need 2 of them to pass to finally get inspection

 

Hi all.

It's been 5 years and still no fix. I found a jaguar specialist who has had the car for a few months now but he hasn't been able to find anything yet.

He had a customer come in that had some sort of jerking problem with his XJS so he swapped the two ECUs (mine in his, his in mine). We are still doing more tests with the computer so it could be that.

My car doesn't have his problem, and his car doesn't have my problem. It is really weird. I don't want to drop a few grand on an ECU if that really isn't the problem. Now he is saying it could be an O2 sensor that is causing the not ready codess -- but I don't think it would cause 4, maybe 1 or 2.

Seriously -- anyone have ANY clue what this is? The check engine light does come on when you first start the car for that split second.

Thanks all

 

Blimey 5 years!!!!

Whereabouts are you in NC? It is really hard to find a knowledgeable mechanic to work on the car. I've had excellent success with Chris Bechard at Foreign Accents in Greensboro. Chris has worked on just about every kind of Jag from XK120's up to present day vehicles.

A thought, have you tried disconnecting the O2 sensor and see if the ECM will actually throw a code? I think it should be a FF44

Good luck,

Allan

 

Im in Greensboro and have actually been to foreign accents many times. Isn't Chris also good with porsches? He's been there many years (if we are thinking about the same chris!)

I have not taken my jag to him yet, but will be doing so if I cant get it resolved at my current mechanic (who specializes in jags)

Thanks Allan!

 

Not sure if there are other Chris's there but this chap is Chris Bechard, a super nice guy and really knows Jags. While I was there last week he had an e-type, an XK 140, several Xj6/8's there as well as a 90 XJS that he was about to convert to a Tremec T56 manual.

 

ineed....

Your Ck Eng Light should come on when the ignition is on. It should stay on until the engine is started, then go out, PROVIDED no fault codes are stored. If faults exist, it will stay on.

Here is a pretty intricate drive cycle that should make all the monitors run on the AJ16 engine. It's a pain, but it should make the tests run so you can pass inspection.

Service Drive Cycle

1. Allow the car to 'soak' at room temperature until the coolant temperature reaches 60 deg. C.

2. Start engine.

3. Idle for approximately 8 minutes; diagnostics such as a misfire, sensors and actuators will run and produce an outcome. An additional test requiring the engine to run for 15 minutes is present, thus a long idle period is the most appropriate method consuming time without excessive miles being clocked.

4. Accelerate in drive (maximum gear 3rd engine speed 2000 rpm, wide open throttle), up an incline to maintain a high load for approximately 10 seconds, this will test the Neutral Drive switch and Road Speed diagnostics.

5. Drive as normal, whilst driving, change through the gears briskly such that 40 gear changes are requested. This further tests the Neutral Drive Switch.

Note: Required gear changes must be between gears, not between Neutral and Drive.

6. Accelerate in drive to a target road speed in the range of 35-45mph, then cruise at target speed preferably in a flat surface to achieve a steady load. Attempt to maintain the speed for a duration of approximately 3 minutes. This allows adaptations and the Catalyst monitoring routine within the system to take place.

7. Come to idle and park.

8. Rev the engine to 1500I2000 rpm for a duration of approximately one minute.

9. Wait at idle for a period of 2 minutes.

10. Interrogate Generic Scan Tool and establish faults, if any.

11. Switch off engine.

When performing diagnostics on a vehicle technicians should be aware that erroneous codes may be introduced by their actions. In order to ensure correct diagnosis, all codes should be noted, before commencing diagnosis, so that induced codes can be identified on completion and safely cleared without further work.


Good luck!

 

Gave him a call today. It was indeed the same Chris that I knew way back when I had my hifi car audio store. I'll swing by his place soon and see what we can do. Thanks. Will keep everyone updated.