Section 55.3 SPN 641/FMI 5

Section 55.3
SPN 641/FMI 5

This diagnosis is typically an open circuit.‪

Section 55.3.1
Open Circuit Check

Check for an open circuit as follows:‪

  1. Disconnect the wastegate control actuator connector.
  2. Turn the ignition ON (key ON, engine OFF).
  3. Measure the voltage between pins 1 and 4 of the wastegate control actuator connector.
    1. If the voltage is between 11 and 13 volts, go to step 5 .
    2. If the voltage is less than 11 volts, go to step 4 .
    3. Click to see this graphic in a separate window

      Figure 1. Wastegate

  4. Measure the voltage between pin 4 of the wastegate control actuator connector and ground.
    1. If the voltage is between 11 and 13 volts, then repair the open in the wire between pin 38 of the 120–pin MCM connector and pin 1 of the wastegate control actuator connector. Refer to "55.3.1.1 Verify Repairs" .
    2. If the voltage is less than 11 volts, Repair the open in the wire between pin 93 of the 120–pin MCM connector and pin 4 of the wastegate control actuator connector.
  5. Turn the ignition OFF.
  6. Disconnect the 120–pin MCM connector.
  7. Measure the resistance between pin 3 of the wastegate control actuator connector and pin 35 of the 120–pin MCM connector.
    1. If the resistance is less than 3 Ω, repair the open circuit in the wire between pin 3 of the wastegate control actuator connector and pin 35 of the 120–pin MCM connector. Refer to "55.3.1.1 Verify Repairs" .
    2. If the resistance is greater than 5Ω, replace the wastegate control actuator . Refer to "55.3.1.1 Verify Repairs" .
Section 55.3.1.1
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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