Question about 1998 Jeep Grand Cherokee

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Will a faulty MAP Sensor on a 1998 Jeep Grand Cherokee cause problems with the Idle Air Control System? I am getting a P0505 diagnostic code and have changed the Idle Air Control Motor. Still receiving the P0505 code and have cleaned the Intake Maniford and trouble shot the electrical connections between the ECU and the IAC and have not found any problems.

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  • Jeep Master
  • 14,036 Answers

YOU HAVE INTAKE VACUUM LEAK AT THROTTLE BODY OR PCM HAS FAILED.NOT CONTROLLING IDLE SPEED CONTROL CIRCUIT.

Posted on Oct 06, 2010

  • skater_bo465 Jul 15, 2011

    check for open or shortened conditions in the idle air control motor curcuits.if you have done all of that and it is running fine i would jus erase the check engine code with a diagnostics scanner.from what i have researched on the 98 jeep grand cherokees after the vehicle has been crunk up 40 times sence the repair it will turn off if the problem is resovled if it stays on jus double check every connection and around and to the idle air control system

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98 JEEP CHEROKEE CODE P0505


That error code is idle control system malfunction.  You need to replace your idle air controller (IAC). IAC basically opens and closes the throttle at idle so it stays at constants RPM.  Hope this helps.  Thanks for an honest rating and for using FixYa.

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Wont stay runing


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