08-28-2012, 07:15 PM
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#1
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Where is the OCR relay
I'm hunting for my fuel pump problem. Got a new pump, it works but only when I jump the FP to the battery on the test terminal. Jumping the B+ to the FP doesn't send juice to the pump. When I go straight to the battery, the pump starts and the engine will turn over and run for a few seconds. I'm trying to figure out what the deal is.
I've been told I could have a faulty Open Circuit relay, or a bad EFI relay, or...... a bad ECU modual
any help would be great!
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Last edited by smallstar; 08-28-2012 at 08:40 PM.
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08-28-2012, 09:01 PM
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#2
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Are you putting the Ign in the RUN position when you jump when you jump the +B and FP terminals?
That energizes the EFI relay which supplies the 12V to the +B terminal and the COR relay, which in turn supply +12V to the Fuel Pump.
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'89 4Runner SR5 - stock
Last edited by fourwd1; 08-28-2012 at 09:05 PM.
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08-28-2012, 09:20 PM
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#3
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ignition in run
Yes the ignition is in the run position. b+ to FP, produces no volts to the fuel pump. But, FP straight to the battery does.
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08-28-2012, 09:53 PM
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#4
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That points to either a bad EFI relay or an open in the wiring on the +B side of the relay to the COR/Engine Check Connector.
OR, if that 7.5A IGN fuse is bad, the EFI relay won't energize, so no +B to the COR/Chk Conn.
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'84 4Runner - ARBed 5.29s F&R, 4.7 & 2.28 t-cases, 2" drive train lift, BudBuilt x-member/skid, 30 spl Longs
'83 Toy P/U - Buick 231 V6, Holley 4 bbl, Weiand intake, Downey headers, TH350 w/700R4 low gearset,
'89 4Runner SR5 - stock
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08-28-2012, 09:58 PM
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#5
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Oh yeah, the COR is located above the ECM behind the pass side kick panel.
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- the Internet - the mother-ship of people who don't know much and aren't afraid to go public
'84 4Runner - ARBed 5.29s F&R, 4.7 & 2.28 t-cases, 2" drive train lift, BudBuilt x-member/skid, 30 spl Longs
'83 Toy P/U - Buick 231 V6, Holley 4 bbl, Weiand intake, Downey headers, TH350 w/700R4 low gearset,
'89 4Runner SR5 - stock
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08-28-2012, 10:12 PM
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#6
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THankyou Thankyou... I'm gonna go straight to that in the morning.
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08-28-2012, 10:21 PM
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#7
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I have been through 2 EFI relays-- I would replace that first.
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08-29-2012, 12:53 PM
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#8
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Yes!!!!!!!!
Quote:
Originally Posted by fourwd1
That points to either a bad EFI relay or an open in the wiring on the +B side of the relay to the COR/Engine Check Connector.
OR, if that 7.5A IGN fuse is bad, the EFI relay won't energize, so no +B to the COR/Chk Conn.
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Thank you. It was the 7.5amp fuse, not the relay. I finished up replacing the line with fuel injector line, replaced the fuse and it started right up, no leaks. 
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08-29-2012, 01:03 PM
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#9
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Quote:
Originally Posted by smallstar
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Glad I could help.
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- the Internet - the mother-ship of people who don't know much and aren't afraid to go public
'84 4Runner - ARBed 5.29s F&R, 4.7 & 2.28 t-cases, 2" drive train lift, BudBuilt x-member/skid, 30 spl Longs
'83 Toy P/U - Buick 231 V6, Holley 4 bbl, Weiand intake, Downey headers, TH350 w/700R4 low gearset,
'89 4Runner SR5 - stock
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04-04-2022, 11:13 AM
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#10
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Howdy yall, same kinda problem, no power to EFI, not sure where the 7.5 ign or efi fuse is, this is a 95, checked every fuse I can find, initial problem was kind of intermittent in nature by the way. If I jump the efi relay it runs find but no power to the efi relay, the COR is functional but havent checked if its getting power. At wits end!!
I have no clue where the various test points everybody keeps talking about lol, guess I need a pressure washer first, everythings grimy!!
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