Section 57.4
SPN 641/FMI 11

This code typically means the Smart Remote Actuator 5 has restricted operability.‪

Section 57.4.1
Actuator Check

Check as follows:‪

1. Check for multiple codes.
   1. If 168/1 (low battery voltage) is present with 641/11 troubleshoot 168/1 first.
   2. If only 641/11 is present, go to the next step.
2. Using DDDL 7.0, perform the Turbo Hysteresis test.
   1. If you are unable to perform the Turbo Hysteresis test, go to step 10 .
   2. If the Turbo Hysteresis test fails, go to step 6 .
   3. If the Turbo Hysteresis test is a pass, repeat the test to see if the results are the same. If the results are the same, refer to "57.4.1.1 Verify Repairs" . If the repeat test fails, go to the next step.
3. Disconnect the turbo actuator.
4. Check the actuator supply voltage.
5. Measure the voltage between pins 1 and 2 of the turbo actuator harness connector.
   1. If the voltage is less than 11 volts, repair the cause of the low voltage. Refer to "57.4.1.1 Verify Repairs" .
   2. If the voltage is greater than 11 volts, go to the next step.
6. Turn the ignition OFF.
7. Disconnect the MCM 120–pin connector.
8. Measure the resistance between pin 3 of the turbo actuator harness connector and pin 74 of the MCM 120–pin connector.
   1. If the resistance is greater than 3 Ω, repair the open circuit between pin 3 of the turbo actuator harness connector and pin 74 of the MCM 120–pin connector. Refer to "57.4.1.1 Verify Repairs" .
   2. If the resistance is less than 3 Ω, go to the next step.
9. Measure the resistance between pin 4 of the turbo actuator harness connector and pin 75 of the MCM 120–pin connector.
   1. If the resistance is greater than 3 Ω, repair the open circuit between pin 4 of the turbo actuator harness connector and pin 75 of the MCM 120–pin connector. Refer to "57.3.1.1 Verify Repairs" .
   2. If the resistance is less than 3 Ω, replace the turbo actuator. Refer to "57.3.1.1 Verify Repairs" .
10. Remove the turbo actuator.
11. Physically move the sector gear on the turbo from 1 to 2, see Figure "Moving the Sector Gear" .
    

    1. Alignment Hole – Alignment pin fits into housing‪

    2. Reference Indentation – Sector shaft covers one-half of indentation‪

    Figure 1. Moving the Sector Gear

12. Check the free movement from 1 to 2 (see Figure "Moving the Sector Gear" ), return back to 1 and install the pin to insure proper alignment. Once you have proper alignment, remove the pin.
    1. If there is free movement, replace the turbo actuator. Refer to "57.4.1.1 Verify Repairs" .
    2. If there is not free movement, go to the next step.
13. Remove the turbocharger and inspect for signs of foreign material contamination.
    1. If foreign material damage is found, repair the source of material entry and contact the Detroit Diesel Customer Support Center at 313–592–5800 for turbocharger replacement authorization.
    2. If no foreign material damage is found but there is no free movement, contact the Detroit Diesel Customer Support Center at 313–592–5800 for turbocharger replacement authorization.

Section 57.4.1.1
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.