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Old Sep 7, 2009, 01:23 PM   #1
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HOW TO: Check Fuel Relay with Multimeter

Since there has been a bit of confusion on how to check the fuel relay that people are having issues with, I decided to make a mini write up.

Items Required:
Multimeter
About 2-4ft. of wire red/black
Fuel Relay
A Brain
Beer

1.)Locate the Fuel Pump Relay


2.)Pull out Fuel Pump Relay

3.)Connect Red Wire to (+) and Black Wire to (-). I chose to use the RED for the 12v and the jump start terminal in the engine bay, the engine as the ground.

Perform this test for continuity or if the current flows through the relay.



NOTE: Note that while the probes are not touching anything, the multimeter will indicate a reading of infinity (OL). A reading of infinity means that the circuit is open. When you touch the two probes together, the reading changes to zero. A reading of zero indicates that the circuit is closed or complete. A complete circuit is one that can conduct electricity; an open circuit cannot.

Check if the relay is any good. It says for headlights, but it works the same for the fuel pump relay since all the relays are the same part.



When I had current applied, I read 0.00 OHM, meaning that I had continuity and current flowed. Then when I checked relay it read less than two OHMs.

Hope this helps people. It literally took me 10 minutes to check mine.
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Old Sep 7, 2009, 04:46 PM   #2
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I want to specify that when you check continuity between pins 1 and 2, the resistance there should be 142 Ohm (tolerance: 10%), as you can read from the relay NAIS ACV31212 datasheet here: http://www.datasheetarchive.com/pdf-...DSA-104509.pdf
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Last edited by therocket; Sep 7, 2009 at 04:56 PM.
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Old Sep 7, 2009, 07:03 PM   #3
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Quote:
Originally Posted by therocket View Post
I want to specify that when you check continuity between pins 1 and 2, the resistance there should be 142 Ohm (tolerance: 10%), as you can read from the relay NAIS ACV31212 datasheet here: http://www.datasheetarchive.com/pdf-...DSA-104509.pdf
Bye
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List:
-CBRD Tune -COBB AP -COBB UICP, LICP, BOV HP -COBB SFI -COBB Turbo Inlet Pipe -COBB Sway Bars -ETS 4" FMIC -AMS DP -T1R Exhaust -MXP TP -FORGE WGA -xMR Catch Cans -AMS Front Rollerstop -AMS Fuel Rail -evoDynamics 3 Port -Deatschwerks 800cc -Techna-Fit SS Lines -TWM Short Shifter -WORKS Bushings -SWIFT Sport-Mach's -Whiteline Kit -AEM UEGO -STRI PSI Gauge -Rally Armor Mudflaps -PERRIN 3" Ant.

Future:
ROTA Torque
CBRD BBK Turbo
Kelford Stg.2 w Springs
SteepSpeed Exhaust Manifold
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acv31212, check, continuity, fuel, infinity, meter, multi, multimeter, pump, read, relay, relays, terminal, test, testing, works

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