Hello Everybody!! I have a 98 xj8l with 138k on it. I have been through the mud and back due to ECM issues. It seems that I might have found the light(Thanks to numbers of knowledgeable members on here ) but now I have all of these Diagnostic Trouble Codes. So here we go. P1112-states "Intake Air Temperature Sensor 2 low input". My problem is that while researching I found something that said I only had one IAT sensor and that the number 2 sensor only exists on AJ27 motors or Supercharged xj8s. Does anyone know the location and if I even have a 2nd IAT??
P1474-states "Intercooler water pump circuit malfunction".
P0405-states Exhaust gas recirculation sensor A circuit"low input". Im confused with this one because according to the dealership I dont have a Exhaust gas recirculator.
Can anyone point me in the right direction as to where I can locate the "egr sensor A" and "intake air temp sensor 2" if I even have one?? Maybe a pic or something. Also in regards to P1474 Im going to replace the fuse to see if maybe it's a simple fix.
. Thanks in advance

 

Odd. Maybe posting your VIN would help.

 

Last 6 are 813400. Do you need the whole vin?

 

My first question is do you have the supercharged engine? The codes are all for a supercharged engine.
Let us know if it is and we can point you in the right direction.

 

No Sir, not supercharged at all. I have the AJ26 engine. The Iat2 code is what led me to believe I possibly recieved the wrong ecm. Am I correct?

 

Where did you say you received an ECM???

Not enough VIN to know but you have DTCs for SC.

 

In my first post on the thread I started, I stated I had been through the mud with ecm issues. Long story, but after the original one was apparently fried, I found a company named foreignautoemn I believe. They got me a remanufactured ecm and implanted my security strip from my orignal ecm to the remanned one. My complete vin is SAJHX6240WC813400. Are you sure ALL of the codes were for a supercharged xj8?? I'm in the middle of shipping it back to the company now for a replacement. Wanted to make sure I had the wrong ecm and I just wasn't receiving generic codes or something. Thanks

 

If not all, definitely many. Hard to have an intercooler water pump giving correct readings, without an intercooler water pump, so that's an obvious code to have, as is the first one. Did you happen to jot down, or take a picture of the part numbers and stickers from your original ECM somewhere? Something that would help you compare.

 

Ok thanks, I had no idea I did not have a intercooler water pump. I still have the original ecm, all the numbers matched, I guess the company just didn't make sure it wasn't from a supercharged xj8. Shipping it back in the next 30 mins, will keep you posted. Thanks for all the help!

 

The ECM is definitely searching for supercharger components. The normally aspirated engine doesn't have IAT2, no auxiliary cooling pump and only supercharged engines have an EGR.
I am not sure what they transplanted but the ECM doesn't have a security strip and has no effect on security.
The start up procedure is the key is on the fuel rack is charged, key excitor ring queries the SCLM with the key transponder code the SCLM then gives permission for the starter to crank. While cranking the Crankshaft Position sensor send a signal that the engine is rotating and the ECM comes alive and gives spark. Bad key the SCLM will not allow cranking.

 

Thanks for the info, what a disparity. I will be forwarding this message to the technician. You are greatly appreciated!

 

Definitely looks like it's an SC one.

 

is there a thread where it discusses a p1112 code on a 98 XJR?

 

P1112 means bad (or missing) signal from the Inlet Air Temp Sensor 2 (IATS 2) which is mounted to the back of the RHS charge cooler. The code means the ECM is getting a signal representing too cold air temp. This can be caused by the sensor not being connected, or there is a poor contact in its connector or in the wiring on the way to the ECM or the sensor itself is bad.

Inspect/clean the pins of the sensor connector. You should also remove the sensor and check its resistance. A good sensor should read about 1.8-1.9 KOhm at 25C, higher if cooler and lower if warmer.

 

are you able to pinpoint where the sensor is via picture please? i am unsure where it is

 

The brass thing screwed into the back of RHS charge cooler.

 

WOW! I OWE YOU A BIG THANK YOU @M. Stojanovic YOU'RE A LIFE SAVER! FOUND AND FIXED!