DD15 SPN 2791/FMI 4 Troubleshooting

SPN 2791/FMI 4

This diagnosis is typically short to ground.‪

Check as follows:‪

  1. Disconnect EGR valve connector.
  2. Disconnect 120–pin MCM connector.
  3. Measure the resistance between pin 1 of the EGR valve connector and ground.
    1. If the resistance is less than 5 Ω, repair the short circuit between pin 1 of the EGR valve connector and ground. Refer to “97.2.1 Verify Repairs” .
    2. If the resistance is greater than 5 Ω, replace the EGR valve.

Verify Repairs

Verify repairs as follows:‪

  1. Turn ignition OFF.
  2. Reconnect any electrical connections that were disconnected to perform the diagnosis.
  3. Clear codes with DDDL 7.0 or latest version.
    To avoid injury from inhaling engine exhaust, always operate the engine in a well-ventilated area. Engine exhaust is toxic.‪
  4. Start and bring engine up to operating temperature (over 140°F/60°C).
  5. Verify operation is satisfactory and no warning lamps illuminate. If warning lamps illuminate, troubleshoot the codes.

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