Go here:
http://www.eclassbenz.com/node/27
Check for a loose ground wire
Check fuses
check your alternater
11: No crank signal to computer. Fault in wiring between crankshaft position sensor (CPS) and ECM ( PCM or computer ) or faulty CPS.12: Battery disconnected. Battery or power to the ECM disconnected in the last 50 key cycles.66: TCM to PCM failure. No message from the Transmission Control Module (TCM) to the Powertrain Control Module (PCM)
Have you checked the fuses?
No
With a scan tool.
check on eBay
No
More than likely its a bad purge control solenoid,check your vacuum lines to your EVAP canister as well as your gas cap gasket.
Below the climate control and back of center console.
With a scan tool.With a scan tool.
Trouble code P0446 means:Evaporative emission control system vent control circuit malfunction
under the glove box ,there is a compartment which houses the 2 filters
Error code 66 on a 1997 Jeep Cherokee means TCM to PCM failure. This code means that the transmission control model is not communicating with the powertrain control model.
Blend door on climate control not working properlyAnswerBlend door on climate control not working properly AnswerBlend door on climate control not working properly Go to www.aircondition.com/tech regarding this problem and do the "self test" by following the steps indicated (1-6). This may correct the problem.AnswerBlend door on climate control not working properlyDo this self-test http://www.lincolnsonline.com/tech/00283.htmlIf you get error code "02" you found the problem. The part is available new online for about $35 and the dash board must be pulled to access and replace it.
Check the ignition control module.