1006-12.pdf - SPN 2791/FMI 0,2,3,4,5,7,11,12,14, and 31 · PDF fileSPN 2791/FMI 14 - ALL YEARS Modification in Step 7 SPN 2791/FMI 31 - ALL YEARS Modification in Step 12 SPN 2791/FMI - [PDF Document] (2024)

  • 1 10 06-12

    SUBJECT DATE

    SPN 2791/FMI 0,2,3,4,5,7,11,12,14, and 31 October 2012

    Additions, Revisions, or Updates

    Publication Number / Title Platform Section Title Change

    DDC-SVC-MAN-0084 DD Platform

    SPN 2791/FMI 0 - GHG14These are new sections.

    SPN 2791/FMI 2 - GHG14

    SPN 2791/FMI 3 - ALL YEARS Procedure has been updated.

    SPN 2791/FMI 4 - ALL YEARSModification in Step 4

    SPN 2791/FMI 5 - ALL YEARS

    SPN 2791/FMI 7 - ALL YEARSModification in Step 12

    SPN 2791/FMI 11 - ALL YEARS

    SPN 2791/FMI 14 - ALL YEARS Modification in Step 7

    SPN 2791/FMI 31 - ALL YEARS Modification in Step 12

    SPN 2791/FMI 12 -GHG14 This is a new section.

    10 06-12

    All information subject to change without notice. 310 06-12Copyright 2012 DETROIT DIESEL CORPORATION

  • 2 SPN 2791/FMI 0 - GHG14

    This diagnostic is typically the result of high load operation in high ambient temperatures. No action is necessary; this is a'silent' fault where the fan will be turned on.

    NOTE: This fault is a concern only if the fan-on times are excessive but coolant temperatures are in the normaloperating range.

    1. Check for multiple codes:a. If SPN 110/FMI 0 is also present, repair the cooling system first. Verify repairs.b. If only SPN 2791/FMI 0 is present, Go to step 2.

    2. Visually inspect for signs of exhaust leaks in the area of the Exhaust Gas Recirculation (EGR) valve actuator.a. If exhaust leaks are present, repair as necessary. Verify repairs.b. If no exhaust leaks are present, Go to step 3.

    3. Remove and inspect the actuator cooler lines and fittings.a. If the coolant lines or fittings are kinked or plugged, repair or replace any damaged component.b. If no restrictions are present, Go to step 4.

    4. Blow through the actuator and make sure nothing is stuck in the coolant passage.a. If the actuator is plugged, repair or replace component.b. If no problem found, verify repairs. Call Support Center at 800-445-1980.

    2 SPN 2791/FMI 0 - GHG14

    4 All information subject to change without notice.Copyright 2012 DETROIT DIESEL CORPORATION10 06-12

  • 3 SPN 2791/FMI 2 - GHG14

    This diagnostic is typically the result of high load operation in high ambient temperatures. No action is necessary; this is a"silent" fault where the fan will be turned on.

    NOTE: This fault is a concern only if the fan-on times are excessive but coolant temperatures are in the normaloperating range.

    1. Check for multiple codes:a. If SPN 110/FMI 0 is also present, repair the cooling system first. Verify repairs.b. If only SPN 2791/FMI 2 is present, Go to step 2.

    2. Visually inspect for signs of exhaust leaks in the area of the Exhaust Gas Recirculation (EGR) valve actuatora. If exhaust leaks are present, repair as necessary. Verify repairs.b. If no exhaust leaks are present, Go to step 3.

    3. Remove and inspect the actuator cooler lines and fittings.a. If the coolant lines or fittings are kinked or plugged, repair or replace any damaged component.b. If no restrictions are present, Go to step 4.

    4. Blow thru the actuator and make sure nothing is stuck in the coolant passage.a. If the actuator is plugged, repair or replace component.b. If no problem found, verify repairs. Call Support Center at 800-445-1980.

    10 06-12

    All information subject to change without notice. 510 06-12Copyright 2012 DETROIT DIESEL CORPORATION

  • 4 SPN 2791/FMI 3 - ALL YEARS

    This diagnostic is typically Circuit Failed High.

    1. Disconnect the Exhaust Gas Recirculation (EGR) valve connector.2. Turn the ignition ON (key ON, engine OFF).3. Measure the voltage between pin 1 of the EGR valve connector and ground.

    a. If the voltage is greater than 11.5 volts, repair the short to power between pin 1 of the EGR valve connector andpin 61 of the 120-pin MCM connector.

    b. If the voltage is less than 11.5 volts, replace the EGR valve.For the DD13: Refer to section "Removal of the Exhaust Manifold".For the DD15 and DD16: Refer to section "Removal of the DD15 and DD16 Exhaust Gas Recirculation Valve".

    4 SPN 2791/FMI 3 - ALL YEARS

    6 All information subject to change without notice.Copyright 2012 DETROIT DIESEL CORPORATION10 06-12

  • 5 SPN 2791/FMI 4 - ALL YEARS

    This diagnostic is typically Circuit Failed Low.

    1. Check for multiple codes.a. If SPN 3598/FMI 4 is also present, troubleshoot SPN 3598/FMI 4 first.b. If only SPN 2791/FMI 4 is present, Go to step 2.

    2. Disconnect the Exhaust Gas Recirculation (EGR) valve connector.3. Disconnect the 120pin Motor Control Module (MCM) connector.4. Measure the resistance between pin 1 of the EGR valve connector and ground.

    a. If the resistance is less than 10K , repair the short circuit between pin 1 of the EGR valve connector andground.

    b. If the resistance is greater than 10K , replace the EGR valve.For the DD13: Refer to section "Removal of the Exhaust Manifold"For the DD15 and DD16: Refer to section "Removal of the DD15 and DD16 Exhaust Gas Recirculation Valve"

    10 06-12

    All information subject to change without notice. 710 06-12Copyright 2012 DETROIT DIESEL CORPORATION

  • 6 SPN 2791/FMI 5 - ALL YEARS

    This diagnostic is typically an Open Circuit.

    1. Check for multiple codes.a. If SPN 2791/FMI 5, SPN27/FMI 4, and SPN1073/FMI 4 are present, repair the open circuit between pin 62 of

    the 120pin Motor Control Module (MCM) connector and Exhaust Gas Recirculation (EGR) valve and front JakeBrake solenoid.

    b. If only SPN2791/FMI 5 is present, Go to step 2.2. Disconnect the EGR valve.3. Disconnect the 120pin MCM connector.4. Measure the resistance between pin 1 of the EGR valve harness connector and pin 61 of the 120pin MCM connector.

    a. If the resistance is greater than 3 , repair the open circuit between pin 1 of the EGR valve harness connector andpin 62 of the 120pin MCM connector.

    b. If the resistance is less than 3 , replace the EGR valve.For the DD13: Refer to section "Removal of the Exhaust Manifold"For the DD15 and DD16: Refer to section "Removal of the DD15 and DD16 Exhaust Gas Recirculation Valve"

    6 SPN 2791/FMI 5 - ALL YEARS

    8 All information subject to change without notice.Copyright 2012 DETROIT DIESEL CORPORATION10 06-12

  • 7 SPN 2791/FMI 7 - ALL YEARS

    This diagnostic is typically the Exhaust Gas Recirculation (EGR) Actuator, Failsafe Mode, Motor On.

    1. Check for additional voltage fault codes SPN 168 FMI (any).a. If fault codes are present, troubleshoot and repair them first.b. If no additional voltage fault codes are present, Go to step 2.

    2. Using DDDL 7.x, check SPN 2791/FMI 7 extended data record #3 physical data; refer to chart below for the"Reserved for Extreme Parameter" value.

    10 06-12

    All information subject to change without notice. 910 06-12Copyright 2012 DETROIT DIESEL CORPORATION

  • Table 1.Reserved for Extreme Parameter Action to take

    3 Go to step 3.

    8,11 Go to step 9.

    3. Turn the ignition OFF (key OFF, engine OFF).4. Disconnect the EGR valve actuator pull rod. Inspect the ball sockets on the pull rod for free movement. For DD13,

    ensure part number is A4711401646 or higher; for DD15/16, ensure part number is A4721400646 or higher.a. If the ball sockets do not rotate/move freely or the rod is not the most recent part number, replace the EGR valve

    actuator pull rod.For the DD13, Refer to section "Removal of the Exhaust Gas Recirculation Valve Actuator Pull Rod"For the DD15 and DD16, Refer to section "Removal of the Exhaust Gas Recirculation Valve Actuator Pull Rod"

    b. If the ball sockets move freely and the part number is recent, Go to step 5.

    NOTE: Some resistance is normal; however, the actuator should not bind in any particular spots.

    5. With the EGR valve actuator pull rod disconnected, physically sweep the EGR actuator throughout its travel.a. If actuator binds at any point in its travel, replace the EGR actuator.

    For the DD13, Refer to section "Removal of the Exhaust Manifold"For the DD15 and DD16, Refer to section "Removal of the DD15 and DD16 Exhaust Gas Recirculation Valve"

    b. If EGR actuator does not bind, Go to step 6.6. With the EGR valve actuator pull rod disconnected, turn the ignition ON and monitor SRA3 status using DDDL.

    Table 2.SRA3 Status Value Action to Take

    EPA07 EPA10

    9 or 10 Learn: Span too large, using initial valueOR Learn: Stops invalid using initialvalue.

    Do not replace the actuator. Cycle ignition2 more times and continue to monitorSRA3 status; if SRA3 status continues tobe the same, Go to step 7.

    Any other value. Any other value. Replace the EGR valve actuator and Go tostep 16.

    7. Turn the ignition OFF (key OFF, engine OFF).8. With the EGR actuator pull rod disconnected, physically move the EGR valve butterfly from stop to stop to check for

    full travel (some drag is normal).a. If EGR butterfly does not move fully from stop to stop, replace the EGR valve. Go to step 16.

    For the DD13, Refer to section "Removal of the Exhaust Manifold"For the DD15 and DD16, Refer to section "Removal of the DD15 and DD16 Exhaust Gas Recirculation Valve"

    b. If EGR butterfly moves stop to stop, reconnect the EGR valve actuator rod to the EGR valve and EGR actuator.Go to step 16.

    9. Turn the ignition OFF and disconnect the EGR actuator harness connector.10. Measure the resistance between pins 3 and 4 of the EGR actuator connector (engine harness side).

    a. If the resistance is between 55 and 65 ohms, replace the EGR actuator.b. If the resistance is not between 55 and 65 ohms, Go to step 11.

    11. Disconnect the MCM 120-pin connector.12. Measure the resistance between pins 3 and 4 of the EGR valve actuator co

1006-12.pdf - SPN 2791/FMI 0,2,3,4,5,7,11,12,14, and 31 · PDF fileSPN 2791/FMI 14 - ALL YEARS Modification in Step 7 SPN 2791/FMI 31 - ALL YEARS Modification in Step 12 SPN 2791/FMI - [PDF Document] (2024)

FAQs

What is freightliner code spn 2791 fmi 2? ›

This diagnostic is typically EGR Valve Actuator, Position Deviation Error.

How to fix fmi 13 code? ›

If the SPN 13 FMI 13 code is active, the engine may be derating due to a loss of power. The most likely cause is a low battery voltage. Check the battery voltage and charging system. If the battery voltage is low, charge the battery.

What does SPN mean in diagnostics? ›

SPN stands for Suspect Parameter Number. It's a diagnostic trouble code that provides detailed information about specific faults detected by the vehicle's ECU, making it easier to identify and address issues within the vehicle's electronic systems.

What does SPN mean in fault codes? ›

SPN stands for Suspected Parameter Number which tells you the circuit where the fault occurred. For example, if you had a SPN 1791 code, it would point to a fault detected in the EGR Valve Control Circuit. FMI stands for Failure Mode Indicator which tells you the reason the fault code was set.

What is the FMI code 14? ›

FMI 14 – Special Instructions: The TECU has detected an abnormally long up or down button request.

What is the fault code FMI 12? ›

An FMI 12 code will tell us that the module or a component that is monitored by this module has gone bad and needs replaced. Data Communication errors are usually going to come from issues in CAN communication.

What is code spn 2791 fmi 14? ›

SPN 2791/FMI 14 - GHG14

This diagnostic is typically Exhaust Gas Recirculation (EGR) Valve Actuator Wrong Failsafe Calibration.

What is the code FMI 2 on a Freightliner? ›

SPN 51/FMI 2 - ALL YEARS

This diagnostic is typically Intake Throttle Position Deviation Error. This code sets when the intake throttle valve position has a 30% deviation from the position commanded by the Motor Control Module (MCM) when the engine coolant temperature is above 60°C (140°F).

What is the FMI code? ›

FAILURE MODE IDENTIFIERS (FMI) Now that we have defined MID (The component) and PID (types of data), we can talk about Failure Mode Identifiers (FMI). Every diagnostic trouble code (DTC) that you find will have an FMI.

Where is the EGR actuator on a DD15? ›

On the DD15 with an asymmetrical turbocharger, the Exhaust Gas Recirculation (EGR) actuator is located on the cylinder block as opposed to the turbo-compound model DD15, where the EGR actuator is mounted in a bracket on the exhaust manifold.

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