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Diagnostic Procedure

WARNING: This page is about a different car, the 2005 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
P0506-IDLE SPEED PERFORMANCE LOWER THAN EXPECTED DIAGNOSTIC TEST REFERENCE

TEST ACTION APPLICABILITY
1
NOTE: If any other DTCs are present, they must be diagnosed and repaired before continuing this test.
Ignition on, engine not running.With the DRBIII®, read DTCs and record the related Freeze Frame data.Is the Good Trip Counter displayed and equal to zero?Yes --> Go To 2No --> Refer to the INTERMITTENT CONDITION SYMPTOM .Perform POWERTRAIN VERIFICATION TEST VER - 5 .		 All
2 Inspect the Air Induction System for the following problems.
Restrictions: Dirty Air Cleaner, Foreign material trap in the air intake tube, etc.
Leaks: Air Intake tube connection, Air Cleaner housing, etc.
Remove the IAC and inspect for foreign debris.
Check the MAP Sensor for proper installation.
Were any problems found?
Yes --> Repair or replace as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 5 .
No --> Go To 3		 All
3 Inspect the throttle plate for carbon build up or other restrictions.
Verify that the throttle cable between the Accelerator Pedal and the Throttle body is not binding.
Make sure the throttle plate is in the idle position.
Remove the IAC Motor and actuate the IAC Motor with the DRBIII® to verify proper operation.
Install the IAC Motor.
WARNING: WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.

With the vehicle is running, lightly tap on IAC Motor, with your hand, and listen for idle to raise.
Were any problems found?
Yes --> Repair or replace as necessary.
Perform POWERTRAIN VERIFICATION TEST VER - 5 .
No --> Go To 4		 All
4
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.If there are no possible causes remaining, view repair.RepairReplace and program the Powertrain Control Module per Service Information.Perform POWERTRAIN VERIFICATION TEST VER - 5 .		 All
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