Circuit/System Testing

Verify none of the following conditions exist:

P0506

• Excess deposits in the Q38 throttle body. Refer to Throttle Body Cleaning .
• Restricted exhaust
• Mechanical conditions that limits engine speed
• Parasitic load on the engine--For example, a transmission condition, a belt driven accessory condition.
  • If a condition is found, repair as necessary.

P0507

• Vacuum leaks
• A throttle valve that does not close correctly
• Verify the correct operation of the crankcase ventilation system. Inspect for the following conditions:
  • The routing of the positive crankcase ventilation (PCV) system
  • Vacuum leaks in the PCV system--Refer to Crankcase Ventilation System Inspection/Diagnosis .
  • If a condition is found, repair as necessary.