Thank you in advance for any helpful reply.

I took a ride with my 1997 XK8, everything was fine. I have owned the car for a little over 3 years, no problems. She is a Sunday driver, never out in the winters, 70,000 miles on her. I put my foot on the gas pedal, and lost my power, RESTRICTED PERFORMANCE on my speedo. It went into limp mode. My mechanic did a diagnostic, showed code, p0335, so he installed a new crankshaft position sensor. The car rode fine for about a mile, then the same thing happened. Now it is showing no codes. The strange thing, is that my console button for the cruise control stays lit up, wether in the up or down position, the red light is on. I have it in my garage now, bringing it down to my mechanic this week. Please, if anyone has had this issue, let me know what it might be.

Thank you, Rich in Pa.

 

Bigrichfish

That's the crank position sensor code but it indicates other problems with the sensor circuit beyond just the sensor itself. There could just as easily be a short in the circuit itself that causes the sensor to malfunction and replacing the sensor won't cure the short.

From the 1999 second edition of the svc. manual for XK8's is this section starting on page 1499.

"Q : DTC P0335, P0336; CRANKSHAFT POSITION (CKP) SENSOR CIRCUIT MALFUNCTION

Q1 : CHECK THE CKP SENSOR FOR CORRECT INSTALLATION

1. Turn the ignition switch to the OFF position.

2. Check the CKP sensor for correct installation.

Is the CKP sensor correctly installed?

-> Yes

Goto <<Q2>>

-> No INSTALL the CKP sensor correctly. Reconnect the sensor. CLEAR the DTCs. TEST the system for normal operation.

Q2 : CHECK THE CKP SENSOR FOR DEBRIS

1. Remove the CKP sensor and inspect for debris.

Is the CKP sensor free of debris?

-> Yes

-> No

CLEAN the sensor and wheel. INSTALL the sensor. Reconnect the sensor. CLEAR the DTCs. TEST the system for normal operation.

Q3 : CHECK THE CKP SENSOR SENSE CIRCUIT FOR HIGH RESISTANCE

1. Disconnect the battery negative terminal.

2. Disconnect the ECM electrical connector, EM83.

3. Measure the resistance between EM83, pin 08 (Y) and PI17, pin 02 (Y).

Is the resistance greater than 5 ohms?

-> Yes

REPAIR the high resistance circuit. For additional information, refer to the wiring diagrams. CLEAR the DTC. TEST the system for normal operation.

-> No

Goto <<Q4>>

Q4 : CHECK THE CKP SENSOR SENSE CIRCUIT FOR SHORT TO HIGH VOLTAGE

1. Reconnect the battery negative terminal.

2. Turn the ignition switch to the ON position.

3. Measure the voltage between PI17, pin 02 (Y) and GROUND.

Is the voltage greater than 3 volts?

-> Yes

REPAIR the short circuit. For additional information, refer to the wiring diagrams. CLEAR the DTC. TEST the system for normal operation.

-> No

Goto <<Q5>>

Q5 : CHECK THE CKP SENSOR SENSE CIRCUIT FOR SHORT TO GROUND

1. Turn the ignition switch to the OFF position.

2. Measure the resistance between EM83, pin 08 (Y) and GROUND.
Is the resistance less than 10,000 ohms?

-> Yes

REPAIR the short circuit. For additional information, refer to the wiring diagrams. CLEAR the DTC. TEST the system for normal operation.

-> No INSTALL a new CKP sensor. CLEAR the DTC. TEST the system for normal operation.

 

Chances are, there are Jaguar-specific codes to help you diagnose what is happening. You need to ask your mechanic to read those as a starting point.

Best of luck, keep us posted.

 

Welcome to the forums Rich,

I've rotated your vertical photo to horizontal. Smartphones and tablets have an orientation attribute that makes them display correctly but many forums can't interpret this.

When you get a minute, please follow this link New Member Area - Intro a MUST - Jaguar Forums - Jaguar Enthusiasts Forum to the New Member Area - Intro a MUST forum and post some information about yourself and your vehicle for all members to see. In return you'll get a proper welcome and some useful advice about posting to the forum.

Graham

 

Bigrichfish,

I suspect an electrical ground connection issue as you seem to have a few gremlins in addition to the P0335. Check out this 2009 thread where Jag-off had identical symptoms
https://www.jaguarforums.com/forum/x...t-crank-15786/
He found it was the LF1 Engine ground.

 

It was a bad ECU all along. I sent it out to ASI in Memphis Tennessee. Got it back in 3 days rebuilt, cost me $120, delivered. She is running at 100%, better than ever.

Took this picture today, when we got home.