DD15 SPN 647/FMI 3 Troubleshooting

SPN 647/FMI 3

This fault code indicates that there is a short to power.‪

Check as follows:‪

  1. Turn the ignition OFF.
  2. Disconnect the fan control solenoid connector.
  3. Turn the ignition ON (key On, engine OFF).
  4. Measure the voltage between pin 1 of the fan control solenoid connector and ground.
    1. If the voltage is greater than 11.5 volts, repair the short to power between pin 1 of the fan control solenoid connector and pin 98 of the 120–pin MCM connector. Refer to “57.1.1 Verify Repairs” .
    2. If the voltage is less than 11.5 volts, replace the fan control solenoid. Refer to “57.1.1 Verify Repairs” .

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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