COMPUTER CODES

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Jun 14, 2002 | 08:05 AM

mayerst

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From: silver spring usa

COMPUTER CODES

Can anyone tell me what the code 539 (AC or defrost on) means? This truck is a 1994.

Thanks

Jun 14, 2002 | 08:21 AM

mantta

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From: Keweenaw Bay, MI

COMPUTER CODES

My code book does not show a code 539. It shows a 538 and then jumps up to code 542.

Jun 14, 2002 | 02:15 PM

groundrat

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From: New Hampshire

COMPUTER CODES

Code 539 reads: System shows voltage at PCM pin 10. Was your A/C on while running the test?

Jun 17, 2002 | 06:04 AM

mayerst

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From: silver spring usa

COMPUTER CODES

[updated:LAST EDITED ON 17-Jun-02 AT 07:05 AM (EST)]No, the AC wasnt on when I ran the test. Why would that make the check engine light stay on?

Thanks

Jun 17, 2002 | 09:04 AM

groundrat

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From: New Hampshire

COMPUTER CODES

Not too sure on that one. I have never seen the code before. You may want to call your local Ford dealer and ask their opinion. Have you tried to clear all the codes from the computer? Does the truck run any different? ie.. too rich, too lean, no power..etc? Keep us posted.

Bill