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The mkiv Supra Owners Club

fuel pump problems


Guest Rsand85

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would anybody be able to tell me if the fuel pump control module inside the rear wing is controlled by the ecu?have power coming into it but no power getting to the pump itself and also no spark at the plugs wandering if these are both controlled by the ecu and it wont give spark as it cant pick up on the pump running?thinking the ecu has packed in!any help on this would be much appreciated

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i can bypass the pump control to run pump but it dosent help as i have no spark just floods the plugs.was over the alarm system it all seems to be ok was working perfect one day then next day it was not car never moved from the spot! that's even more confusing now if the 2 aren't connected really not sure whats next.

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will do that i have checked every fuse and relay with no joy im afraid cant understand what it would be mite get another ecu and fuel pump control unit to see if it sorts it

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ok still haven't got this going getting power to both fuel pump control and the coil yet the pump is not working and im getting no spark also getting power at injectors.also i cant read the engine fault codes as the engine management light will not come on!!tried 3 fuel pump control modules and 2 ecus also new rotor arm and cap along with new coil and leads!!!running out of ideas any help would be much appreciated

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The engine management light is fused in the footwell fuse box 7.5amps not sure which one but it also feeds the MAIN ecu check to see if you have voltage. also the fuel pump ecu has a live feed via relay BUT has another signal feed that comes from the MAIN ecu if there is no crank signal the ecu will not switch the pump on. or create a SPARK

Edited by absz (see edit history)
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ok checked that out tonite dude no fuses blown.checked the following fuses for power IGN 7.5A-no power

ECU-IG 10A-no power

ECU-B10A-no power

also checked at the igniter getting 12 v on 2 out of the 5 wires black/red and black/orange :(

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do you have a wiring diagram that i can look at to see were the feeds come from? as the last time i stuck my head under a NA engine bay was over 6 years ago, i'm sure that the ignition feed is direct from ignition switch to fuse and then to MAIN ecu. if you have lost power feeds it can be alarm wiring or fusebox connector plugs as a guess.

Edited by absz (see edit history)
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its possible if you remove the steering column cover and have a look at the ignition switch the alarm will be connected to the ignition circuit between there and the footwell fuse box might be worth bypassing it or just connecting a bridge link to that wire. ALSO the clifford alarm will have its own fuses approx 3 if i'm right.might be worth looking for them aswell

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theres 5 fuses as i fitted the lot myself all connections are soldered and heat shrunk opposed to the cowboys who fitted it by twisting the wires together and taping over them!!it was forever giving bother so rewired it and added the intellistart its never given any hassle for 2 years thats not to say it wouldn't be the prob tho.

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ok stripped the wiring out or the engine bay as im in the process of re spraying replaced all the wiring as it was once it was painted problem was the timing was off as i had the distributor out but was getting plenty fuel and strong spark just wouldnt fire due to timing!timed it up and had to start it with booster as batt was flat thats why i thought i maybe spiked the ecu!!the alarm is working fine but as i say now lost spark and fuel.

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did you remove the wiring loom from the ecu as there is some additional plugs white plug and a grey one along with the ecu plugs MAKE sure these plugs are firmly in place and pushed all the way home. apart from the engine light is there any other dash warning lights that are not working?

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i did but after it had stoped working i only removed 2 plugs tho one large one with a 10mm bolt and a smaller one clipped in.and no the engine management is tho one and only light thats not working.

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