Section 7.1 SPN 97/FMI 3

Section 7.1
SPN 97/FMI 3

SPN 97/FMI 3 indicates a Water-in-Fuel Sensor open circuit.‪

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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 "7.1.1 Verify Repairs" .
    2. If only fault 97/3 is active, go to the next step.
  2. Disconnect the Water-in-Fuel Sensor.
  3. Turn the ignition ON (key ON, engine OFF).
  4. Measure the voltage between pins 1 and 3 of the Water-in-Fuel Sensor harness connector.
    1. If the voltage is between 2.75 and 3.25 volts, go to step 6 .
    2. If the voltage is less than 2.75 volts, go to the next step.
  5. Measure the voltage between pin 1 of the Water-in-Fuel Sensor harness connector and ground.
    1. If the voltage is between 2.75 and 3.25 volts, repair the open circuit between pin 3 of the Water-in-Fuel Sensor harness connector and pin 55 of the MCM 120-pin connector. Refer to "7.1.1 Verify Repairs" .
    2. If the voltage is less than 2.75 volts, repair the open circuit between pin 1 of the Water-in-Fuel Sensor harness connector and pin 71 of the MCM 120-pin connector. Refer to "7.1.1 Verify Repairs" .
  6. Disconnect the MCM 120-pin connector and measure the resistance between pin 57 and pin 2 of the Water-in-Fuel Sensor harness connector.
    1. If the resistance is less than 5 Ω, repair the short between pin 2 and 57 of the MCM 120-pin connector. Refer to "7.1.1 Verify Repairs" .
    2. If the resistance is greater than 5 Ω, replace the sensor. Refer to "7.1.1 Verify Repairs" .

Section 7.1.1
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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