14TS20
Service Bulletin Details
Public Details for: 14TS20
14ts20 ghg14 auto-elevate feature
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Models from 2009
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Models from 2007
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2007 FCCC XCM |
2007 FCCC XCP |
2007 FREIGHTLINER 122SD |
2007 WESTERN STAR 4700 |
14 TS-20 August 7, 2014 TO: Service Locations FROM: Service Systems Development SUBJECT: GHG14 Auto-Elevate Feature ISSUE During extended periods at idle speed (slow or fast), unburned fuel from the combustion process slowly collects in the Aftertreatment System (ATS). This unburned fuel is also referred to as hydrocarbon. If too much hydrocarbon is allowed to accumulate in the ATS, the next drive cycle could result in higher than normal internal ATS temperatures as the hydrocarbon burns off. This could potentially cause a failure of the Diesel Particulate Filter (DPF). ACTION The Auto-Elevate feature automatically increases engine RPM to manage hydrocarbon buildup and keep it from reaching critical levels. This process results in a temporary increase of exhaust gas temperatures to effectively control burn off of the hydrocarbons within the ATS. If Auto-Elevate feature is enabled, the following safety interlocks must be met for the AutoElevate timer to start: • Transmission in Neutral • Park Brake set to ON • Clutch out (not depressed) • Road speed = 0 • Engine at idle speed (slow or fast) With Auto-Elevate enabled, and after a predetermined amount of idle time, the DDEC 13 Aftertreatment Control Module(ACM) will automatically elevate engine speed to 1100 RPM for up to 20 minutes. This will raise exhaust temperatures and eliminate hydrocarbon buildup in the ATS. The Auto-Elevate feature will only be enabled while the vehicle is not in Power Take Off (PTO) speed control. Specifically, the PTO switch is off (CPC connector 2, pin 9 is not grounded or J1939 (SPN 65264) PTO message for PTO switch is off). NOTE: Auto-Elevate will rapidly increase engine speed to 1100 rpm, and maintain the speed for up to 20 minutes. Vehicles equipped with mechanically driven PTOs (FEPTO or REPTO), or a nonswitched PTO device (without dedicated PTO switch wired to CPC connector 2, pin 9), will be affected by the increase in engine speed. Do not enable Auto Elevate if the PTO equipment cannot accept the increase in engine speed when the PTO is not active. 14 TS-20 8/7/14 When the process of eliminating the hydrocarbon from the ATS is complete, the engine returns to idle speed and the timer for the Auto-Elevate feature resets. DETAILS OF OPERATION Actual idle time needed to activate the Auto-Elevate process varies with engine platform and Clean Idle status. If Auto-Elevate is NOT enabled, excessive idle time may result in the following codes: • SPN 5443 / FMI 15: DPF HC Absorption Warning • SPN 5443 / FMI 16: DPF HC Absorption High • SPN 5443 / FMI 0: DPF HC Absorption Very High Continued idling without the Auto-Elevate feature enabled may result in an engine shutdown, similar to soot buildup in DPF Zone 5. A slight haze may appear out of the exhaust pipe during the Auto-Elevate procedure. The Auto-Elevate procedure can be stopped at any time by voiding any of the safety interlocks listed earlier. When this happens, the engine will do a fast ramp-down to idle speed. Once all safety interlocks have been met again for four minutes, Auto-Elevate will resume (assuming hydrocarbon burn-off has not yet occurred). With the Auto-Elevate feature enabled, there are now TWO timers that control the DPF lamp on the dash. • Soot regeneration - This timer is always running, and the lamps on the dash function as they normally do since the beginning of production for the EPA07 engines. • Hydrocarbon buildup - This timer starts when the engine sees vehicle idle state (slow or fast). This timer can start at any time along with the normal soot regeneration timer. Driver interaction with the DPF lamp has not changed if the Auto-Elevate feature is enabled. The driver will not know whether the DPF lamp is for soot buildup or hydrocarbon buildup. The driver will see the DPF lamp for hydrocarbon buildup if the Auto-Elevate feature is disabled or a fault prevents the Auto-Elevate feature from functioning as designed. If the DPF lamp comes on for hydrocarbon buildup, the driver may cycle the necessary switches and activate the dashmounted Regeneration switch to start burning off the hydrocarbon buildup per the process mentioned earlier. If the unit is in DPF Zone 2 or higher, it will also perform a full parked regeneration of the ATD. ENABLING THE AUTO-ELEVATE FEATURE • • • • • • • It is a programmable feature via DiagnosticLink™. It is defaulted to “OFF”. The Auto-elevate feature is functional on all versions of GHG14 ACM software. The parameter to enable/disable this feature is located in the ACM group “PGR005_DPF,” and is called “Extended Idle Auto RPM Elevate.” For new truck orders, the Auto-Elevate feature can be factory ordered by selecting Freightliner GHG14 Data Book Code 80L-001 ENABLE AUTO ENGINE RPM ELEVATE FOR EXTENDED IDLE. For vehicles with Eaton Ultrashift transmission, low idle speed must be set according to Eaton guidelines. The Auto-Elevate feature is compatible with Optimized Idle configurations. 14 TS-20 • • 8/7/14 Detroit Diesel recommends the use of the Auto-Elevate feature for non-PTO applications, such as over-the-road trucks with sleeper cabs that regularly idle continuously. Thoroughly review this feature with the customer before enabling the Auto-Elevate feature. FAULT REACTION WITH AUTO-ELEVATE DISABLED • • • • The DPF lamp is programmed to work with the Auto-Elevate feature. The indicator lamp will work exactly as it does for the Regeneration process (except that the engine will NOT derate in Zone 4). The DPF lamp will light for hydrocarbon (HC) if the Auto-Elevate feature is disabled, (example PTO enabled as described above) or unable to function due to a fault. The DPF lamp will not light for HC if the Extended Idle Auto RPM Elevate option is enabled and Auto-Elevate is not interrupted. If Auto-Elevate is NOT enabled, the following lamp progression holds true: Indicator Lamps Description Occurs after approximately 10 hours* of idling. No code is logged. Bring vehicle to highway speeds to allow for an Automatic Regeneration OR Perform a Parked Regeneration SOLID FLASHING FLASHING FLASHING AND AND AND Occurs approximately 1 hour* after the DPF lamp illuminates solid. Code 5443/15 is logged. Bring vehicle to highway speeds to allow for an Automatic Regeneration OR Perform a Parked Regeneration as soon as possible. Occurs approximately 1 hour* after the DPF lamp starts to flash. Code 5443/16 is logged. Vehicle must be parked and a Parked Regeneration OR Service Regeneration must be performed. PARKED REGENERATION REQUIRED. Occurs approximately 1 hour* after the DPF lamp (flashing) and Amber Warning Lamp (solid) illuminate. Code 5443/0is logged. Vehicle must be parked and a Parked Regeneration OR Service Regeneration must be performed. PARKED REGENERATION REQUIRED — ENGINE SHUTDOWN. 14 TS-20 8/7/14 * Time intervals are controlled by an algorithm in the software and are approximations based on ideal conditions. Factors, such as the engine rpm at idle and the zone the DPF is in when idling commences, will affect the length of time before the lamp progression starts. CONTACT INFORMATION Please contact the Detroit™ Customer Support Center at 800-445-1980 or email [email protected] if you have any questions.