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ECU reconditioning, ECU repair, ECU testing. New remanufactured & used ECU’s
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Nottingham Topper/motoring article
By David Peacock, Peacock & Purvey
 Honda Prelude 2.0ltr 8v (F20A4) 1997 - 2002
Some of the car's that we feature do not have the most common faults- if they did then we would soon run out of cars to write about, but they are the most interesting cars to work on since they stop boredom from setting in -just when you think you know it all another jumps out of the woodwork to stop complacency taking over. I'm sure that they are the most interesting to read about to - I love reading about the latest car model out even though ownership is totally out of reach, so in a rather different way though people like reading about weird faults even though they are not likely to experience one.
This Honda Prelude Kept breaking down intermittently despite having had everything that could be renewed changed - including the distributor, Ignition pick up coil, and ignition ECU. The car still refused to idle below 1500 RPM. We then found that the ignition Ecu was causing the intermittent cutting out, and because the price of a new one was a fairly significant proportion of the cost of the car a second hand one was fitted. We then found the reason why the Ignition Ecu had failed since a further fault emerged - the engine refused to idle below about 1500 RPM caused by the dwell on the ignition oscilloscope trace decreasing too low below this engine speed. This was found to be caused by the HT coil being the wrong type for the car and had been damaging all Ecu's fitted to the car. Renewal of the Coil for the correct one ensured that the new Ecu would continue operating without getting damaged and the car also then idled normally.
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Nottingham Evening Post article
by David Peacock, Peacock & Purvey.
Honda Civic Coupe 1.7ltr (D17A2) 2001 - 2002
The Honda brought to us had developed a problem after the clutch had been renewed - the engine would not idle but ran at over 3000 Rpm when warm. The car was a fuel injection model fitted with an idle speed control valve and the cause of the high idle was soon traced down to this unit. The unit itself though was checked out and found to be Ok, it was only doing what the Engine Management Control Unit was telling it to do. At this stage of the investigations a full engine management systems diagnosis was required so the Control Unit was found and a diagnostic adaptor inserted between it and the wiring loom. This showed an abnormal signal from the throttle potentiometer so we traced the wiring back to that unit. The three wire loom to it had been damaged at one point, probably in the course of fitting the clutch. The throttle potentiometer tells the Control Unit the amount of accelerator pedal movement, and because the wiring damage told it that the accelerator pedal was full throttle it sent a signal to the idle speed control valve to open fully. Repairing the wiring brought the idle back down to a sane level.
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Honda, all models 1993 - 2004 onwards
Emission Failures -
High CO & low lamna reading. common causes of rich running faults are the lamna sensor or the ECU (engine control unit) both of these parts are relatively simple to check, to check the sensor strip back the insulation on the signal wire from the lamna sensor, this wire is usually black. Then hold the bare wire between your finger and thumb then touch your other hand on to the battery positive the internal resistance of your body will give 1volt at your finger tips which is what the sensor would give out when the engine runs rich, if the emissions come down then you have a faulty lamna sensor or wiring but if the emissions remain the same then the ECU is a possible fault. For more information on ECU testing click on ECU
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High CO with normal lamna reading. If the oxygen level is below 1% then a high CO with a normal lamna reading can only be one thing - the catalytic converter, when ever you get this reading the catalyst should be condemed. But always make sure you check the oxygen level first, if its high (over 1% at speed) then you’ve got a leaking exhaust or engine runing problems.
Honda, all models 1986 - onwards
Hessitation, power loss, missfire. This type of problem can be one of the most time consuming faults to find because the problem often is only slight and the fault only shows up when the car is being driven under load. One common cause of this is a fouled or sticking injector.
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