P0506 Idle Speed Performance Lower Than Excepted

When monitored code P0506 - Engine running at idle, no throttle input requested, vehicle speed equal to zero, engine run time or more than 30.o seconds. Set conditions, engine speed is more than 100rpm below idle speed for 30.0 seconds. Default cctions, the MIL light is illuminate, if the vehicle is equipped the stop/start feature, the system will be disabled when this DTC is active.

P0506 Idle Speed Performance Lower Than Excepted

Possible causes:
  • Air induction system restrictions
  • PCV system restrictions
  • Throttle Body assembly.
  • Powertrain Control Module (PCM).

Diagnose code P0506 Idle Speed Performance Lower Than Excepted

Step 1. Check for an active DTC
If any other throttle body DTC are present, they must be diagnosed and repaired before continuing this test.
Start the engine, test drive or operate the vehicle in accordance with the when monitored and set conditions. With the scan tool, read DTC.

Is the DTC active?

YES, go to step 2.
NO, perform the the PCM intermittent condition.

Step 2. Air induction system
Turn the ignition off. Inspect the air induction system for restrictions, dirty air cleaner, foreign material trapped in the air intake tube, etc.

Were any problems found?

YES, repair as necessary.
NO, go to step 3.

Step 3. PCV system
Inspect the PCV system for restrictions-sticking valve, collapsed hoses or tubes, obstructed passages or ports, etc.

Were any problems found?

YES, repair as necessary.
NO, go to step 4.

Step 4. Throttle body operation
Inspect the throttle body for carbon build up, other restrictions, and a bent throttle plate using a straight edge. If the throttle plate does not close entirely it may be bent and needs to be replaced. Start the engine, while the vehicle is running, lightly tap on ETC motor where applicable, with your hand, and listen for idle to raise.

Were any problems found or did the idle fluctuate while tapping on the ETC motor?

YES, verify that there is good pin to terminal contact at the throttle body and the Powertrain Control Module (PCM) connectors. Repair or replace the throttle body assembly if no problems were found in the customer. Disconnect the battery when the replacing the throttle body assembly. After installation is complete, use a scan tool and select the ETC RELEARN function.

NO, go to step 5.

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