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Key On Engine Run test

1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Key On Engine Run test

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Old

Nov 29, 2005 | 05:49 PM

#1

spag

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Key On Engine Run test

I ran the KOER test (ACTRON CP9145) on my 1994 F150 5.0L and received a code 538 "insufficiant rpm during selftest".
Does that mean I need to increase the RPM's during the test or is it pointing out a problem. And if it is a problem what is it pointing to?

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Nov 29, 2005 | 06:05 PM

#2

andym

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From: Bonita Springs FL

When you're running the test, you're supposed to rev the engine when it prompts you. If you didn't, that will cause the error you're getting.

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Nov 29, 2005 | 06:25 PM

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spag

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Thanks, I will try it again.

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