Power Solutions International

1173

UnclassifiedGeneral

What This Code Means

EPR/CFV communication lost; CAN-based DST does not connect to ECM; DTC 1173 fault resets

Possible Causes

  • •Intermittent problem
  • •Faulty harness

Suggested Actions

  1. 1Perform the On-Board (OBD) System Check
  2. 2Attempt to connect to ECM with CAN-based DST and clear fault
  3. 3Disconnect ECM header connection and check continuity between diagnostic connector pin 7 and ECM pin 14, and between connector pin 8 and ECM pin 15
  4. 4Check harness continuity of CAN + wire between EPR Pin 2/CFV Pin 2 and ECM pin 14 (CAN1) or Pin 17 (CAN2)
  5. 5Check harness continuity of CAN - wire between EPR Pin 5/CFV Pin 3 and ECM pin 15 (CAN1) or Pin 16 (CAN2)
  6. 6Check resistance between ECM pin 14 and ECM pin 15 on the harness to verify if it is between 115 and 135 ohms

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