#1
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EEC IV problems - No start
Hi folks, tried to start the car today but no joy whatsoever. I have the earths and +12 permanent and 12 v switched all going to the ECU but when I turn it on the pump does not run. If I measure the output from the ecu it seems to be trying to do something as it switches from 0 volts to about 0.35 volts for a couple of seconds. Looking at the Haynes diagram the pump relay has a live on one side, the ecu feeds the other side so I would expect to see 12 volts between pin 22 and the 12 volt terminal when first switched on.
Just to expand a bit I have earth on pins 16, 40 and 60, perm 12 volts on pin 1 and switched 12 volts on pins 37 and 57 of the ECU. I have tried hooking up a strobe and there is no spark when cranking. Am I missing something obvious? Everything looks connected up ok but I am scratching my head at the moment. Thanks in advance, Enoch |
#2
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I think there is a pinout on my website for the noncat twincam.
Do you have +12v switched live to the coil? TT
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You only get a woosh with a dump valve Build Thread Man Cave Mantiques Cecil Street Auto Repairs Garage Carlisle Build Cost £4181.65 - Last - Wheel Cylinders |
#3
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Whats switching to .35v??
TT
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You only get a woosh with a dump valve Build Thread Man Cave Mantiques Cecil Street Auto Repairs Garage Carlisle Build Cost £4181.65 - Last - Wheel Cylinders |
#4
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Is the fuel pump feed from the ecu to the relay an earth or +12v?
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#5
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Pin 22 should drop from floating to earth. So measured with a meter from the +12V on the battery to pin 22 should give a few seconds of +12V to prime the pump. Do this with relay D disconected.
IS 20 Grounded? TT
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You only get a woosh with a dump valve Build Thread Man Cave Mantiques Cecil Street Auto Repairs Garage Carlisle Build Cost £4181.65 - Last - Wheel Cylinders |
#6
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Hi folks, thanks for taking an interest in this - a bit more info. When the ignition is off the pump is running. When I turn the ignition on the pump stops. Pin 20 is grounded, sorry missed it off the list.
The 0.35 volts is the reading from ground to pin 22 when I switch the ignition on. All I seem to get is a click ( sounds like an injector) when I switch on, nothing else seems to happen - no spark - nuffink, the injectors don't fire. Most confusing. |
#7
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have you been rewiring? the pump should never run with the ignition off.
TT
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You only get a woosh with a dump valve Build Thread Man Cave Mantiques Cecil Street Auto Repairs Garage Carlisle Build Cost £4181.65 - Last - Wheel Cylinders |
#8
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Don't measure voltage to ground from pin 22, you won't get any sensible reading. 22 is pulled to ground inside the ecu, you either need to try a continuity test from ground via pin 22 ( no continuity ignition off , 2 seconds with ignition on whilst prime takes place ). Or the same with +12V from the battery through the meter using 22 as the ground and meter on voltage.
TT
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You only get a woosh with a dump valve Build Thread Man Cave Mantiques Cecil Street Auto Repairs Garage Carlisle Build Cost £4181.65 - Last - Wheel Cylinders |
#9
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Hi there, you are quite correct - it should not run with ign off. I just went and redid it so that the +ve side of the relay goes to a switched live instead of perm live. What now happens is that when the ignition is switched on the pump runs for about 3 seconds then stops (I think this is correct?). Still not getting any spark or sound of injectors firing. Think I am getting CPS signal because when I stop cranking the pump runs again for a couple of seconds - I assume the pump will run when the cpu sees crank pulses and the rail pressure is low?
Bloody witchcraft |
#10
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Also Have you bypassed the antitheaft module? You won't get +12V at the coil or to the engine management relay XI if the imobaliser module is not bypassed or the module is in alarmed mode ( it's a black module about 3" x 2" 16pins in 2 rows).
TT
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You only get a woosh with a dump valve Build Thread Man Cave Mantiques Cecil Street Auto Repairs Garage Carlisle Build Cost £4181.65 - Last - Wheel Cylinders Last edited by twinturbo : 26th June 2010 at 08:37 PM. |
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