Hi guys i posted a thread asking advice on my non starting 96 X300. Below is the things to note

RPM stays at 0 when cracking
Battery light stays on

Check Engine light has now come on.

The battery charge needle drops into the red when cranking.

I have replaced the crank sensor, battery and all 6 spark plugs. Im suspecting it could be the fuel pump but have no idea how to replace it. Have undone the bracket in the trunk but it still dnt seem to want to move.

Any help would be great as i really want the old girl on bk on the road with my XJS.

Kind Regards
Dave

 

Have you checked the connections on the ECU for corrosion? That can happen due to water ingress if you have a sunroof. If you are correct about the rpm staying at zero, then I think your fuel diagnosis is not correct.

And what is the error code behind the CEL?

 

Hi Dave,

I discovered the hard way that the pins in the electrical connector for the CKPS can be pushed backward, out the back side of the connector, when you connect it to the harness connector. So even though you have installed a new CKPS, it may not be electrically connected. It might be worth checking to be certain the pins in the connector are actually making good contact with the harness. The tach reading of 0 rpm while cranking is a classic symptom of CKPS failure (or no CKPS connected).

Before you worry about replacing the fuel pump it will be possible to either confirm or disprove that it is the problem, so please check the CKPS connection first and report back.

Cheers,

Don

 

Hi there thank you for the response where would i find the ecu and the code?

 

I will check the ckps pins now

 

Hi again i have just checked the CKSP pins and they are all fine. How would i find out the CEL error code? And where is the ecu?

 

The ecu is in the kickboard on the right side of th ecar here, and I think it is still on the right for right hand drive cars, which I assume applies to your car. The codes are read with a OBDII scanner. Here in the US, many auto parts will read them for free, but I think it is still an entrepreneurial venture in the UK to read them for folks. Nowadays, if you have an android device, you can get a scanner for less than $25.00 that will read the codes nicely.

 

Ok thanks i'll look in the kick board. And yes i have the right hand side as im in the uk

 

Ross, I thought the X300 ECU was behind the passenger-side kickboard (or knee bolster or dash underscuttle) also. On the XJ40 it's always behind the passenger side, whether the car is RHD or LHD. The X300 parts diagrams at jaguarclassicparts.com make it appear that the ECU (ECM) is on the right regardless of whether the car is RHD or LHD:

U.K.

Electronic Control Module-4.0 Litre - Parts For XJ Series from (V)720125 to (V)812255 (X300) | Jaguar Classic Parts UK

LHD Countries:

Electronic Control Module-4.0 Litre - Parts For XJ Series from (V)720125 to (V)812255 (X300) | Jaguar Classic Parts UK

Here's a link to pix showing the ECU/ECM and other components behind the passenger side knee bolster of our LHD XJ40:

Welcome to Jag-lovers - Members Photo Viewing Page


The X300 Workshop Manual may be more specific.

Cheers,

Don

 

what is CKPS as it is not a known acronym.

 

Cool:
Well, it may not be known to you, and it may not even be the "official" Jaguar designation, (Don?), but CKPS is used by many of us to mean "Crank Position Sensor". and there are 5,970 results on Google for "CKPS Jaguar"

And... I now realize you are trying to make a point about "known acronyms", as you were part of this thread ( https://www.jaguarforums.com/forum/x...m-loss-113171/ )

But, CKPS is used in the Jaguar literature, so I suggest you find another dead horse to whip!

 

Ross and Cool,

Prior to the X300, Jaguar used the acronym CPS when referring to the Crankshaft Position Sensor. Beginning with the X300 and the introduction of a Camshaft Position Sensor (Jaguar acronym CMP or sometimes CMPS) to the AJ16 Engine Management System (EMS), Jaguar adopted the use of the acronym CKPS (or sometimes "CKP Sensor") when referring to the Crank Position Sensor, apparently to avoid potential confusion between the two sensors. The acronym CPS was essentially discontinued except when referring to models with engines prior to the AJ16.

I speak not as an authority on Jaguar terminology, but simply as one who, prior to last summer, had studied most of the existing literature on the XJ40 and much of the Series III service literature, and since last summer has studied most of the existing service literature on the X300, X308 and X350. For skeptics, reading the workshop manuals for any of these later models will confirm the terminology mentioned in the paragraph above.

Cheers,

Don