DD15 SPN 4258/FMI 3 Troubleshooting

SPN 4258/FMI 3

This diagnosis is typically injector #1, 2, or 3 amplifier control valve circuit is shorted to battery/power.‪

Check as follows:‪

  1. Disconnect the Front Injector Harness 14–pin connector.
  2. Turn the ignition ON (key ON, engine OFF).
  3. Measure the voltage between pin 2 on the MCM side of the Front Injector Harness 14–pin connector and ground.
    1. If there is voltage present, repair the short to power between pin 2 of the Front Injector Harness 14–pin connector and pin 14 of the 120–pin MCM connector. Refer to “132.1.1 Verify Repairs” .
    2. If there is no voltage present, go to the next step.
  4. Measure the voltage between pin 4 on the MCM side of the Front Injector Harness 14–pin connector and ground.
    1. If there is voltage present, repair the short to power between pin 4 of the Front Injector Harness connector and pin 10 of the 120–pin MCM connector. Refer to “132.1.1 Verify Repairs” .
    2. If there is no voltage present, repair the short to power between pin 6 of the Front Injector Harness connector and pin 12 of the 120–pin MCM connector. Refer to “132.1.1 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.
    ENGINE EXHAUST ‪
    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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