## Diesel Engine Management System

#### DTC Troubleshooting (cont'd)

11-135

DTC P1616: RAM Performance

1. Check the ''On Board Diagnostic (OBD) System Check''.

Was the ''OBD System Check'' performed?

YES – Substitute a known-good ECM and recheck. If symptom/indication goes away, replace the original ECM.

NO – Go to OBD System Check.

DTC P1617: ECM Internal Ground Connection Error

1. Check the ''On Board Diagnostic (OBD) System Check''.

Was the ''OBD System Check'' performed?

YES – Substitute a known-good ECM and recheck. If symptom/indication goes away, replace the original ECM.

NO – Go to OBD System Check.

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