Buly, In all the responses to your problem everyone has mentioned EC2 power and ground. Since the other functions of the EC2 are working that is obviously not the problem. The one place that I would have looked, at first, is the Injector current returns on pins 19 and 37. If these are not grounded then the injectors will not work. This is easy to check. Just disconnect the plug from the EC2 and assure that these pins are connected to ground. You may have thought of this already but that is where I would start. Good luck. Jim
jewen@comporium.net wrote:
Buly,
I would add one thing to Al's info on the NOP. There are three wires
required for the serial communications, one is RX, one is TX these would
be the 2
refered to as serial commumications. The third wire (electron
flow path) is ground. Lack of a common ground between the 2 units would
prevent communications. Also a high resistance ground would hamper comms
(communication level is TTL or <5V.) Noise into that ground lead may also
corupt the data stream resulting in invadild data or failure of a checksum
(if the EM2 uses a checksum.) I do not have an EM2, but have set up
serial comms from the EC2 to my on board computer.
A ground problem would also explain why the injectors do not fire. The
injector triggers are sinking, which means when on the driver connects the
injector wiring to ground to complete the circuit. If a poor ground path
exists it may not be enough to support the current load from the
injectors.
Joe
On Sat, May 19, 2007 7:47 pm, Bulent Aliev wrote:
> Al,
> I have two EC2's. Bob White sent me his to test against mine. The NOP
> is
flashing on both and A/B processors too. I have power to pins 33 and 34.
> Spark plug / ignition test on Mode 8 works fine.
> 2 Serial leads have connectivity between EC and EM.
> Since I have a second EC to swap, the EC is not a suspect.
> During the Tracy's update I replaced the single wires to the
> injectors with two pairs of shielded 18 gauge I got at S&F. I started
> suspecting the wire, since it has one blue and one white wire inside. The
> number on the wire is: 2112/202SJ-18 1F2Y2. I thought it may be a some
> kind of resistor wire? But we tested resistance, and checked fine? Thanks
> Al. Looks like I need dumb luck to get out of this one :)
> Buly
>
>
> On May 19, 2007, at 8:29 PM, Al Gietzen wrote:
>
>
>> Buly;
>>
>>
>> Two things: Have you checked that the processor chip(s) are fully
>> seated in plug (base); and - is the
behavior the same for both
>> controllers?
>>
>> If you have +12 power to pins 33 or 34, and you have the serial lead
>> connected to the EM2, and the processor in functioning, you should not
>> see NOP. Possibly something has happened in shipping or handling. If
>> the processor is not functioning of course you can not trigger the
>> injectors.
>>
>> Good luck,
>>
>>
>> Al
>>
>>
>>
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