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75E17 Non start edc no comms
Topic Started: Jan 5 2013, 06:31 PM (10,661 Views)
seven of nine
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Hi All

Just been having problems with my iveco tector 75E17 2004 i bought. When ignition is switched on edc light and abs light flash on and then off, also the temp and oil pressure gauges shoot up to limit and then go off again. I have no comms with engine ecu.

I have an ignition live to ecu, also good earths and live feeds.

Immobiliser light will go out and all seems ok there.

The edc bulb was fused and i replaced it.

Has anyone got any other tests i could do?

Your thoughts are appreciated
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Vector
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Hi.

Possible engine EDC ECU.
If you have bulb tested all the earths and powers and that is good. Have you check can line resistance down at the edc ecu?

Have you got communication with the immobiliser?
If so what are the faults?
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seven of nine
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Hi

Can you tell me the pin no`s for can? I dont have that info

thanks for your help
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Vector
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Hi

On the EDC ECU plug B which is the biggest plug on the ecu.
PIN number 52 CAN line low white wire and PIN number 53can line high green wire.
Check the resistance between the 2 wires.
The resistance should be 60 ohms. If you get a reading of 120 ohms or 0 ohms there is something
Wrong with the CAN lines.

Check it out and let me know how you get on.
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andrusca
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Vector
Jan 9 2013, 02:21 PM
Hi

On the EDC ECU plug B which is the biggest plug on the ecu.
PIN number 52 CAN line low white wire and PIN number 53can line high green wire.
Check the resistance between the 2 wires.
The resistance should be 60 ohms. If you get a reading of 120 ohms or 0 ohms there is something
Wrong with the CAN lines.

Check it out and let me know how you get on.
Hello Vector,
I have a similar problem with an Iveco Eurocargo Tector. All problems starts when 24V batteries were connected with polarity reversed. I have repalced the internal EDC ECU protection and short circuit between ECU power supply inputs that previously existed is now fixed. But when it is powered with 24V and receives contact signal (pin B-39) it turns on (internal power supplies +5V, +3.3V, +6.8V, etc are stablished) and after aprox 500ms it turns off completely, so no communication with scanner is possible. In the past I have faced exactly the same situation when testing another tector ECU alone, without connection with the truck, that underwent the same fault but after installing the EDC ECU onto the truck, it works perfectly, i.e., the ECU dos not turn off after 500ms after receiving contact signal though pin B-39 and the truck starts fine. I think perhaps the ECU is waiting some confirmation signal from the truck during power up process that it is not receiving in this last case, because perhaps there is some faulty truck commponent or module that suffers the initial battery reversal. I have tried connecting this ECU in an Eurocargo Attack truck, but got the same behaviour. I have measured resistance between CAN lines with ECU connected to the truck and it is 60 ohms. This truck does not have immobilizer because pin 12 of diagnostic connector is not populated.
I would really appreciate any guiding advice. Thank you very much.
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Bazil-S
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andrusca
 
EDC has to detect the remote relay coil resistance from the electric motor. If 8888 wire is broken, than the EDC is not initialized, so... communication failed!!!
8888 = green/white wire between starter solenoid and EDC pin 37.
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Troglodyte
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There is a connector in the chass close to the starter for the wire 8888 check to make sure that is not crushed or corroded
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andrusca
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Thanks Brazil-S and Troglodyte for your help. The wire 8888 was not broken, instead and internal PCB track to pin 37 of EDC connector was cut and so EDC7 could not detect the coil resitance. After fixing this issue, the truck started normally.
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