What dose c/opn relay in the engine compartment fuse box mean

Discussion and technical advice the SW20 MR2. 3S-GTE, 3S-GE, 3S-FE etc
Anything and everything to do with maintenance, modifications and electrical is in here for the Mk2.

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asbestos
Posts: 54
Joined: Mon Mar 10, 2008 4:01 pm
Location: Tamworth

What dose c/opn relay in the engine compartment fuse box mean

Post by asbestos »

What dose c/opn relay in the engine compartment fuse box mean or what dose it control,
thanks all.
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gazrev1tubby
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Joined: Sun Jul 19, 2009 5:47 pm
Location: Eastwood, Essex

Re: What dose c/opn relay in the engine compartment fuse box mean

Post by gazrev1tubby »

The circuit opening relay is for the fuel pump
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Peter Gidden
IMOC Affiliated Trackday Organiser
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Joined: Tue Jan 25, 2005 9:49 am
Location: South Yorkshire

Re: What dose c/opn relay in the engine compartment fuse box mean

Post by Peter Gidden »

gazrev1tubby wrote:The circuit opening relay is for the fuel pump


Correct.

More specifically, it has a double ended coil. One end pulls the relay in when cranking, engaging the fuel pump.

When the engine fires, the first coil is switched off (since no more cranking), but the ECU pulls in the other end of the coil, re-engaging the fuel pump.

If the engine is stalled but igntion is still live, ECU will terminate it's signal to the relay, causing fuel pump to swtich off. e.g. in event of accident.
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