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Mustang Forums
2011-2014 Mustangs
Engine/Tuning
Trouble with vehicle stalling
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<blockquote data-quote="Shaun@AED" data-source="post: 14782452" data-attributes="member: 32381"><p>If you datalog battery voltage you will likely find a massive drop as the high speed fan kicks on, which is causing the stall.</p><p>We've found the cause to be the ECU defaulting to high speed cooling fan when the low speed relay goes out.</p><p>It's the huge amperage draw from the fan going from zero to full speed instantly that causes the voltage drop. Normally the fan will already be at 40-50% speed before the high speed kicks in, which does not have the huge amperage pull and therefore no stall. It's when the fan goes from 0 to 100% that we normally see this issue pop up. Every time I've seen this issue it's been a faulty relay, but there could be other reasons for the high speed fan to kick on without the low speed first I suppose. (If that is the problem here, which you can diagnose by logging voltage.)</p></blockquote><p></p>
[QUOTE="Shaun@AED, post: 14782452, member: 32381"] If you datalog battery voltage you will likely find a massive drop as the high speed fan kicks on, which is causing the stall. We've found the cause to be the ECU defaulting to high speed cooling fan when the low speed relay goes out. It's the huge amperage draw from the fan going from zero to full speed instantly that causes the voltage drop. Normally the fan will already be at 40-50% speed before the high speed kicks in, which does not have the huge amperage pull and therefore no stall. It's when the fan goes from 0 to 100% that we normally see this issue pop up. Every time I've seen this issue it's been a faulty relay, but there could be other reasons for the high speed fan to kick on without the low speed first I suppose. (If that is the problem here, which you can diagnose by logging voltage.) [/QUOTE]
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Trouble with vehicle stalling
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