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Fan and Fuel relays

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Old 05-18-2007, 07:34 PM
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Default Fan and Fuel relays
What does the PCM use to close the circuit on the fan and fuel pump relays? Is it a 12v signal or a ground?
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Old 05-18-2007, 08:28 PM
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pretty sure it is ground. i know it is on the fans, not positive on the fp maybe someone will back me up on this.
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Old 05-18-2007, 08:43 PM
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I think the fuel pump uses a 12V signal.
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Old 05-18-2007, 10:15 PM
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Cooling fans are ground
fuel pump is +12V
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Old 05-23-2007, 09:43 AM
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the PCM closes a ground circuit to the operating relays
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