Buy Now | Log In | ALLDATA Corporate Site |
Back To Home Page
Log In To Your Subscription
Go To ALLDATA Back Home
Buy A Subscription! Back Home About ALLDATA Information View Sample Vehicles Read Testimonials View Factory Service Bulletins and Recall Titles Contact Us
Dowload Our Navigation Chart
February 2015: New vehicles added including 2014 GM.
• View New Vehicles
October 2014: Release of 2013 along with initial 2014 Vehicles
• View Vehicles
View All News and Updates:
• Go To News
Tech Tips
  Read All Tech Tips

ALLDATA Tech Articles Are Updated Weekly
• View All Tech Articles

  Dodge Durango: Brake Pulsation Problems In Paul's Durango
• Read Dodge Article
Fixing A Smelly Audi Audi Tech Tip: A4 begins to Smell caused by a Faulty Hose Composition
• Read Audi Article
Why Do You Need To Change Your Timing Belt? Why Replace Your Timing Belt
• Read Belt Article
Jim Grant Tech Tips Jim Grant Tech Tips
A collection of helpful articles based on reader submissions
Home >> Featured Tech Articles >> Go Back
  Jim Grant's Tech TipsJim Grant's Tech Tips
Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by users over the course of many years.
If you have any questions, please feel free to email us.



Lincoln - Mercury
  Jim Grant's Tech Tips

'97 Pontiac Grand AM, A-lot of Parts and Computer Code

Q: My ’97 Pontiac Grand AM has a computer code #1336 that has been down loaded in the last 6 months. I have changed the oxygen sensor, crankshaft position sensor, PCM, plugs, ignition cap assembly, catalytic converter, air filter, thermostat, temperature sensor for the coolant and the engine light is still on. So do you have any recommendations?

- Fred Z.

A: Your vehicle’s computer is only telling you that it wants to learn something. Diagnostic Trouble Code (DTC) # P1336 simply means that the computer has not learned and recorded the variations in crankshaft of the engine. The crankshaft in your vehicle’s engine has a wheel with notches that corresponds with piston position. The crankshaft position sensor reports to the computer each time one of the notches passes by the sensor. After all the computer needs to know where the piston is so it can add fuel or create spark at the spark plug at the right time. But the computer needs to take this knowledge of crankshaft position to the next level. It needs to know and record any variations. Engines and computer sensors are mass-produced and, in theory, all of these parts should be identical. But it is not the case and the engineers allowed for this in the software of the computer. Once in your vehicle’s lifetime the computer needs to learn crankshaft variations and this is performed at the factory. This lifetime information is fine unless the crankshaft position sensor is disturbed (unbolted), replaced or if the vehicle computer is replaced. You’ve done both! The check engine light will not turn off until the computer is commanded to perform a Crankshaft Position Sensor Variation Learning Procedure. To perform this step requires a computer scan tool to access the learn command mode of the software. A little class time should be all that is needed to turn your check engine light off.

Have any Questions About Please Email Us
Buy Now | Log In | About | Sample Vehicles | Testimonials | Join Affiliate Program