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So from what I have found one is a Service Connector and the other is a Data Link Connector???
I'm still none the wiser, why there is two. I can only assume one is for checking the ECU service codes and the other is to program the ECU???
Is there a way to get a bit more out of the ECU?
no,
DLC is for Honda HDS or PGMFI tester, you can also get aftermarket readers that connect to the 3 pin DLC
the SCS is only for reading codes and setting the ignition timing
sorry to dig this up but are there any conversion plug to turn these 3 pin DLC and 2 pin SCS into OBD port ??