Section 123.2 SPN 3661/FMI 14

Section 123.2
SPN 3661/FMI 14

This diagnosis is typically the Electronic Unit Pump current is below normal or an open circuit fault.‪

Section 123.2.1
Check for Open Circuits

Check as follows:‪

  1. Check for multiple codes.
    1. If fault 3659/14 and 3660/14 are active in addition to 3661/14, contact the Detroit Diesel Customer Support Center (313–592–5800) for MCM replacement authorization.
    2. If only fault code 3661/14 is active, go to the next step.
  2. Measure the resistance across Electronic Unit Pump #3. See Figure "Electronic Unit Pump #3" .
    Click to see this graphic in a separate window

    Figure 1. Electronic Unit Pump #3

    1. If the resistance is greater than 3 Ω, replace Electronic Unit Pump # 3.
    2. If the resistance is less than 3 Ω, go to the next step.
  3. Disconnect the MCM 120–pin connector.
  4. Measure the resistance between either pin of the Electronic Unit Pump #3 connector and pin 13 of the MCM 120–pin connector.
    1. If the resistance is greater than 3 Ω, repair the open between pin 13 of the 120–pin MCM connector and Electronic Unit Pump #3. Refer to "123.2.1.1 Verify Repairs" .
    2. If the resistance is less than 3 Ω, repair the open between pin 12 of the 120–pin MCM connector and Electronic Unit Pump #3. Refer to "123.2.1.1 Verify Repairs" .
Section 123.2.1.1
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.
  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.


EPA07 MBE 4000 DDEC VI Troubleshooting Guide - 6SE568
Generated on 10-13-2008

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