Code P0505

Tiny
MECANICO3
  • MEMBER
  • 2001 FORD EXPLORER SPORT TRAC
  • 4.0L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 50,000 MILES
Everything in hood checks out except that when I disconnect idle air control valve (new) nothing happens. Has anyone had this problem before? P.S. No vacuum leaks, no electrical shorts in wiring, sufficient fuel pressure. I think it may be PCM, but I lack a live data computer or scanner.
Wednesday, March 13th, 2019 AT 6:24 PM

3 Replies

Tiny
SCGRANTURISMO
  • MECHANIC
  • 4,897 POSTS
Hello,

Is your vehicle idling at all? Usually when the Idle Air Control valve (IAC) has its electrical connector unplugged, or is malfunctioning in any way, the vehicle will be hard pressed to maintain an idle and, in fact, usually shuts off. The Power-train Control Module uses the IAC to maintain the correct amount of air to enter the intake manifold to keep the engine idling because the throttle plate is closed at idle. Air usually enters the intake manifold via the throttle body when the throttle plate is opened as one steps on the gas pedal. It is then mixed with the proper amount of fuel and burned in the engine's combustion process.
Okay enough of that, I have included for you in the diagrams below, a Diagnostic Troubleshooting Flowchart from the vehicle manufacturer on DTC 0505. You will need a multi-meter and possibly a vacuum pump to perform these tests. You can rent vacuum pumps at your local parts store free of charge. I have included a link below on how to use a multi-meter if needed.

https://www.2carpros.com/articles/how-to-use-a-voltmeter

Please go through the flowchart in the diagrams down below and get back to us with what you find out.

Thanks,
Alex
2CarPros
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Wednesday, March 13th, 2019 AT 7:06 PM
Tiny
MECANICO3
  • MEMBER
  • 31 POSTS
All is good. I am pretty sure it is the PCM.
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Friday, March 15th, 2019 AT 3:35 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
Please let us know what you find. We are interested to see what it is.
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Monday, March 18th, 2019 AT 2:36 PM

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