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P1689 fault code

My profile explains everything. I am a “diesel dummy” but need a little help to finish diagnosing. I want to check the harness from the ECM to the injector pump. I see where it connects to the injection pump then the harness goes into a main loomed harness. I have probably over looked the ECM but where is it so I can check the connector and pins. Any pictures would be a great help. Thanks

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The ecm is on the block. It’s between, and a little lower than the injection pump (vp44) and firewall. 

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Thank you. I will look today 

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