Section 7.2 SPN 97/FMI 4

Section 7.2
SPN 97/FMI 4

SPN 97/FMI 4 indicates a Water-in-Fuel circuit short to ground.‪

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Check as follows:‪

  1. Check for multiple codes.
    1. If any EGR faults are active at the same time, repair the open circuit between pin 67 of the MCM 120-pin connector and pin 3 of the Water-in-Fuel Sensor. Refer to "7.2.1 Verify Repairs" .
    2. If only fault 97/4 is active, go to the next step.
  2. Disconnect the Water-in-Fuel Sensor.
  3. Disconnect the MCM 120-pin connector.
  4. Measure the resistance between pin 1 of the Water-in-Fuel Sensor connector and ground.
    1. If resistance is less than 5 Ω, repair short between pin 1 and ground. Refer to "7.2.1 Verify Repairs" .
    2. If resistance is greater than 5 Ω, go to the next step.
  5. Measure the resistance between pin 2 of the Water-in-Fuel Sensor harness connector and ground.
    1. If resistance is less than 5 Ω, repair the short circuit between pin 2 of the Water-in-Fuel Sensor harness connector and ground. Refer to "7.2.1 Verify Repairs" .
    2. If resistance is greater than 5 Ω, go to the next step.
  6. Measure the resistance between pin 3 of the Water-in-Fuel Sensor harness connector and ground.
    1. If resistance is less than 5 Ω, repair the short circuit between pin 2 of the Water-in-Fuel Sensor harness connector and ground. Refer to "7.2.1 Verify Repairs" .
    2. If resistance is greater than 5 Ω, review the previous steps. If the results are the same, contact Detroit Diesel Customer Support Center (313-592-5800).

Section 7.2.1
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.
    warning

    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. If assistance is required, call the Detroit Diesel Customer Support Center at 313–592–5800.


DD15 Fuel System Technician's Guide - DDC-SVC-MAN-0037
Generated on 10-13-2008

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