Circuit/System Testing

P0506

1. Verify the conditions listed below do not exist.
   • 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.

   • If a condition is not found 
2. All OK.

P0507

1. Verify the conditions listed below do not exist.
   • Vacuum leaks
   • A throttle valve that does not close correctly
   • Verify the correct operation of the crankcase ventilation system. Inspect for the conditions listed below:
     • Improper routing of the positive crankcase ventilation (PCV) system
     • Vacuum leaks in the PCV system.
   • If a condition is found 

     Repair as necessary.

   • If a condition is not found 
2. All OK.