Allison Transmission DDEC IV Service Manual

DDEC IV APPLICAT

ION AND INSTALLATION MANUAL

5 DDEC FEATURES

Section Page

5.1 AIR COMPRESSOR CONTROL ............................................................. 5-3

5.2 ANTI-LOCK BRAKE SYSTEMS .............................................................. 5-9

5.3 CRUISE CONTROL ................................................................................ 5-13

5.4 CRUISE CONTROL FOR DRILLING/PUMPING APPLICATIONS WITH

OPTIONAL DUAL STATION CONTROL ................................................. 5-21

5.5 DIAGNOSTICS ........................................................................................ 5-23

5.6 EDM AND AIM ........................................................................................ 5-27

5.7 ELECTRONIC FIRE COMMANDER ....................................................... 5-31

5.8 ELECTRONIC SPEED SWITCH ............................................................. 5-35

5.9 ENGINE BRAKE CONTROLS ................................................................ 5-39

5.10 ENGINE PROTECTION .......................................................................... 5-45

5.11 ENGINE RATINGS .................................................................................. 5-57

5.12 ETHER START ........................................................................................ 5-61

5.13 EXTERNAL ENGINE SYNCHRONIZATION ........................................... 5-65

5.14 FAN CONTROL ....................................................................................... 5-69

5.15 FUEL ECONOMY INCENTIVE ............................................................... 5-83

5.16 GLOW PLUG CONTROLLER ................................................................. 5-85

5.17 HALF ENGINE IDLE ............................................................................... 5-89

5.18 IDLE SHUTDOWN TIMER AND VEHICLE POWER SHUTDOWN ........ 5-91

5.19 IRIS ......................................................................................................... 5-97

5.20 LOW GEAR TORQUE LIMITING ............................................................ 5-105

5.21 MAINTENANCE ALERT SYSTEM .......................................................... 5-107

5.22 MANAGEMENT INFORMATION PRODUCTS ........................................ 5-131

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DDEC FEATURES

5.23 MARINE CONTROLS ............................................................................. 5-175

5.24 OPTIMIZED IDLE .................................................................................... 5-179

5.25 OPTIMUM LOAD SIGNAL ...................................................................... 5-185

5.26 OVERALL GOVERNOR GAIN ................................................................ 5-187

5.27 PASSMART ............................................................................................. 5-189

5.28 PASSWORDS ......................................................................................... 5-193

5.29 PRESSURE SENSOR GOVERNOR ...................................................... 5-197

5.30 PROGRESSIVE SHIFT ........................................................................... 5-203

5.31 PULSE TO VOLTAGE MODULE ............................................................. 5-209

5.32 TACHOMETER DRIVE ............................................................................ 5-213

5.33 THROTTLE CONTROL/GOVERNORS ................................................... 5-215

5.34 TRANSMISSION INTERFACE ................................................................ 5-233

5.35 TRANSMISSION RETARDER ................................................................ 5-253

5.36 VEHICLE SPEED LIMITING ................................................................... 5-255

5.37 VEHICLE SPEED SENSOR ANTI-TAMPERING .................................... 5-257

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DDEC IV APPLICATION AND INSTALLATION MANUAL

5.1 AIR COMPRESSOR CONTROL

Air Compressor C ontrolis an optional DDEC feature that allows DDEC to regulate engine speed and load/unload a valve in order to maintain a requested compressor outlet air pressure for air compressor applications.

The DDEC A ir Compressor Control Feature is available with the following software releases:

DDEC III - Release 4.0 (only) DDEC IV - all software versions (Release 20.0 or later)

5.1.1 OPERATION

The ECM monitors the air outlet pressure while varying the engine speed and operating load/unload a valve. The valve will be opened or closed. The desired operating pressure may be varied by the operator, within limits preset by the OEM.

The ECM will activate the Air Compressor G overnor Controls when the digital input “Air Compressor Load Switch” is gr ounded. Engine speed is governed based on the actual air compressor outlet pressure versus the desired output pressure. The Air Compressor Pressure Sensor provides a pressure signal to the ECM.

The engine response to various pressure conditions is listed in Table 5-1.

Pressure Set Point

Current outlet pressure is below the pressure set point

Pressure in the system continues to increase and a threshold pressure is exceeded

Current outlet pressure is above the pressure set point

* The engine will continue to run at PTO maximumuntil the outlet pressure matches the sensor pressure. † DDEC will open and close the loading valve as a function of pressure with hysteresis. When the pressure

reaches a programmable limit above the pressure set point the DDEC digital output will be grounded. This output may be used to either open an air compressor vent or close the air inlet. Once the air pressure has dropped to a lower programmable limit, the digital output will be open circuited which will either close the vent

Engine speed increases as required up to PTO maximum speed*

The air compressor solenoid digital output is enabled† (opened)

Engine speed decreases as required down to the minimum PTO speed.

Result

Table 5-1 Engine Operation with Air Compressor Controls

Each horsepower rating has an associated pressure range. Horsepower ratings are defined at time of orde r entry. The minimum and maximum pressure setting for each of the horsepower curves is set with the DDDL/DDR, Vehicle Ele ctronic Programming System (VEPS), or DRS. The initial pressure set point is saved between ignition cycles.

Increase (Resume/Acceleration On)

Momentarily toggling and releasing the Increase Switch (grounding the "Resume/A

cceleration On" digital input) increases set point pressure by 4% of the pressure range. Holding the switch in the incr ease position (gr ounding the digital input), will increase the set point pressure at a rate of two increments per second. Releasing the switch sets the compressor controls to

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the higher setting.

DDEC FEATURES

Decrease (Set/Coast On)

Momentarily toggling and re leasing the decrease switch decr eases set point pressure by 4% of the pressure range. See Figure 5-1. Holding the switch in the decrease position (grounding the digital input), will decrease the set point pressure at a rate of two increments per second. Releasing the switch sets the compressor controls to the lower setting.

Air Compressor Load Switch

Closing (grounding) the air compressor load switch digital input activates the air compressor control system. See Figure 5-1. Opening the air compressor load switch digital input deactivates the air compressor control system.

Air Compressor Solenoid

When the pressure reaches a programmable limit above the pressure set point the D DEC digital output will be grounded. This output may be use d to either open an air compressor vent or close the air inlet. Once the air pressure has dropped to a lower programmable limit, the digital output will be open circuited which will either close the vent or open the air inlet.

Air Compressor Shutdown

DDEC will respond to a proprietary immediate engine shut down message sent over the SAE J1587/J1708 data link by the Electronic Display Module (EDM). This feature requires both an EDM and an Auxiliary Information Module (AIM); refer to section 5.6 for addition information on EDM and AIM.

Multiple Pressure Ratings

The pressure ranges are linked to the engine ratings. A pressure range can be associated with each rating. The maximum number of engine ratings and pressure ranges is three. Choosing the rating, with the DDR/DDDL or rating switches will automatically select the associated pressure range. The proper 6N4D group with multiple 6N4M groups must be specified. For additional information, contact your DDC Applications Engineer.

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DDEC IV APPLICATION AND INSTALLATION MANUAL

5.1.2 INSTALLATION

See Figure 5-1 for the Air Compressor Control Harness.

Figure 5-1 Air Compressor Control Harness

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DDEC FEATURES

5.1.3 PROGRAMMING REQUIREMENTS AND FLEXIBILITY

Air Compressor Controls must be specified at the time of engine order or added to the ECM calibration by Detroit Diesel Technical Service. An Application Code (6N4C) Group must be selected that is configured for Air Compressor Control at order entry or by contacting Detroit Diesel Technical Service.

The digital outputs and inputs listed in Table 5-2 are required for Air Compressor Controls and must be configured by order entry, VEPS, or the DRS.

Description Type Function Number

Set/Coast On (Decrease) Digital Input 20 Resume/Acceleration On

(Increase)

Air Compressor Load Switch Digital Input 35

Air Compressor Solenoid Digital Output 21

Table 5-2 Air Compressor Con trol Required Digital Inputs and Outputs

Digital Input 22

At order entry, the Application Code System (ACS) sets the default values for the parameters listed in Table 5-3. These parameters may be modified using either VEPS or DRS.

Parameter Description

Air Compressor Integral Gain Integral Gain 0-128 RPM/(PSI x SEC)

Air Compressor ProportionalGain Proportional Gain 0-128 RPM/PSI

Air Compressor Pressure

Increment

Percent Pressure Increment

Choice/Display

0-50% (of fuel scale pressure

range)

Table 5-3 Air Compressor Control Parameters

Multiple pressure ratings can be selected with the use of ra ting switches. The proper 6N4D groups with multiple 6N4M groups must be specified at engine order or by Detroit Diesel Technica l Service. The digital inputs listed in Table 5-4 are required.

Description Type Function Number

Rating Switch #1 Digital Input 12 Rating Switch #2 Digital Input 13

Table 5-4 Multiple Pressure Ratings Required Digital Inputs

The VSG maximum and minimum RPM can be set with VEPS, DRS, DDR or DDDL as listed in Table 5-5.

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DDEC IV APPLICATION AND INSTALLATION MANUAL

Parameter Description

VSG Minimum RPM Sets the VSG minimum speed. Idle to VSG, Maximum RPM VSG Maximum RPM Sets the VSG maximum speed. VSG Minimum RPM to (Rated Speed

Table 5-5 Variable Speed Gove

rnor Maximum and Minimum RPM

Choice/Display

+ LSG Droop)

The minimum and maximum pressure is set with the DDDL/DDR, DRS or VEPS as listed in Table 5-6. There is a minimum and maximum pressure setting for each of the horsepower cur v es.

Parameter Description Range

Indicates the delta value above the current air

LOAD PSI

UNLOAD PSI

MAX RAT#1 PSI

MIN RAT#1 PSI

MAX RAT #2 PSI

MIN RAT#2 PSI

MAX RAT#3 PSI

MIN RAT #3 PSI

pressureset point thatwill initiate theair compressor governor to reload the system.

Indicates the delta value above the current air pressureset point thatwill initiate theair compressor

nor to unload the system.

gover Indicates the maximum allowable air pressure set

point for engine rating #1 Indicates the minimum allowable air pressure set

point for engine rating #1. Indicates the maximum allowable air pressure set

point for engine rating #2. Indicates the minimum allowable air pressure set

point for engine rating #2. Indicates the maximum allowable air pressure set

point for engine rating #3. Indicates the minimum allowable air pressure set

point for engine rating #3.

0toUNLOADPSI

LOAD PSI to 31 PSI

MIN RAT#1 to 999 PSI

0toMAXRAT#1

MIN RAT#2 to 999 PSI

0toMAXRAT#2

MIN RAT#3 to 999 PSI

0toMAXRAT#3

Table 5-6 Air Compressor Parameters

5.1.4 INTERACTION WITH OTHER FEATURES

Air Compressor Control may not be used with Cruise Control or the Pressure Sensor Governor. A proprietary immediate engine shut down message for immediate air compressor shutdown is sent over the SAE J1587/J1708 data link by the EDM. This feature requires both an EDM and an AIM; refer to section 5.6 for addition information on EDM and AI M.

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DDEC IV APPLICATION AND INSTALLATION MANUAL

5.2 ANTI-LOCK BRAKE SYSTEMS

Anti-lock Brake Systems (ABS) are electronic systems that monitor and control wheel speed during braking. The systems are compatible with standard air brake systems. The system monitors wheel speed at all times, and controls bra k ing during emergency situations. Vehicle stability and control are impr oved by reducing wheel lock during braking.

5.2.1 OPERATION

The ECM transmits engine data via SAE J1587, SAE J1922, or SAE J1939. Anti-lock brake systems monitor data on one or more of these communication links. In the event that an excessive wheel spin is de tected, the ECM receives a message from the ABS requesting a 0% output torque limit. The message is transmitted on SAE J1922 or SAE J1939.

SAE J1922 and SAE J1939 both implement the same message set. The difference being hardware and performance. SAE J1922 transmits and rec eives data at 9.6 K baud while SAE J1939 transmits/receives data at 250 K baud. SAE J1939 has a much higher bit rate so messages reach their de stination very quickly nearly eliminating the latency found with SAE J1922.

SAE J1922 is enabled on all DDEC IV ECMs. SAE J1939 is enabled on a ll DDEC IV ECMs (Release 24.0 or later). ECMs prior to Release 24.0 must be configured if SAE J1939 is required.

See F igure 5-2 and Figure 5-3 for interface with Meritor/WABCO and Bosch respectively.

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DDEC FEATURES

Figure 5-2 Meritor/WABCO ABS/ATC Interface

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Figure 5-3 Bosch ABS/ATC Interface

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DDEC IV APPLICATION AND INSTALLATION MANUAL

5.3 CRUISE CONTROL

Cruise Control is ava ilable with any DDEC engine. Cruise Control will operate in either Engine or Vehicle Speed Mode and maintain a targeted speed (M PH or RPM) by increasing or decreasing fueling. The targeted speed can be selected and adjusted with dash-mounted switches. Up to five digital inputs are required (four for automatic transmission) for Cruise Control operation and a digital output is optional (refer to section 4.1.1 for additional information on digital inputs). A Vehicle Speed Sensor (VSS) is required for Vehicle Speed Cruise Control.

5.3.1 OPERATION

There are two types of Cruise Control: Engine Speed Cruise Control and Vehicle Speed Cruise Control.

Engine Speed Cruise Control

Power is varied under Engine Speed Cruise Control to maintain constant engine speed. Vehicle speed will vary depending on powertrain components. Engine Speed Cruise Control does not need a VSS. Engine Speed Cruise Control cannot be used with automatic transmissions.

Vehicle Speed Cruise Control

Vehicle Speed Cruise is enabled when "Enable Cruise" and a Vehicle Speed Sensor (VSS) are installed. Engine speed and power are varied under Vehicle Speed Cruise Control to maintain the set vehicle speed. The maximum Cruise Control speed cannot exceed the programmed maximum Vehicle Speed Limit (when programmed). The vehicle speed must be above 20 MPH and the engine speed above 1,100 RPM (1,000 RPM for on-highway 1999 model year or later engines) to set Cruise Control.

This type of Cruise Control is required when either of the following conditions exists:

Vehicle Speed Limiting -- Vehicle Speed Cruise Control is mandatory if the vehicle speed limit is programmed and Cruise Control is desired. This will prevent the ECM from fueling the engine at speeds greater than the vehicle speed limit.

Automatic Transmissions -- Vehicle Speed Cruise Control must be selected if the vehicle is equipped with an automatic transmission. This will ensure proper transmission upshifts while in Cruise Control. Refer to the transmission manufacturer's manual for more information and see the Vehicle Interface Harness schematic.

Cruise c ontrol can be overridden at any time with the foot pedal if the vehicle is not operating at the programmed Vehicle speed Limit.

Smart Cruise

The Eaton®Smart Cruise™ system will send a "he art beat" message on the SAE J1939 Data Link. Manual C ruise Control and Smart Cruise will be disabled if the message is not received over the data link or the message indicates that there is a failure in Smart Cruise. To regain manual control, the driver must toggle the Cruise Master Switch twice within 10 seconds.

Eaton

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and Smart Cruise™ trademarks of the Eaton Corporation.

DDEC FEATURES

This feature is available with Release 27.0 or later. Smart Cruise must be configured by VEPS (Release 27.0 or later), WinVeps (Release 2.0 or later) or the DRS. F or additional information on Smart Cruise, contact Eaton Corporation.

Cruise Enable

Cruise Control is enabled, but not active when the Cruise Control Enable digital input is switche d to battery ground.

Set / Coast On

Set: Cruise Speed is set by momentarily contacting the switch to the ON position

(switching the digital input to battery ground). Cruise Control will become active a nd maintain the engine or vehicle speed present at the time.

Coast: When Cruise Control is active, the Set/Coast input can

be used to reduce power and speed by toggling the switch. Momentarily toggling a nd releasing the Set/Coast switch will decrease the set point by 1 MPH increments for Vehicle Speed Cruise Control and 25 RPM increments

for Engine Speed Cruise Control. Holding the Set/Coast will decrease the set point by 1 MPH per second (Vehicle Spee d CC) or 25 RPM per seconds (Engine Speed CC). When released the Cruise Control set point will

be at the new speed.

Resume / Accel On

Resume: If Cruise Control has been disabled with the service brake or the clutch switch,

momentary contact to the ON position (switching the input to battery ground) restores the previously set cruise speed.

Accel: When Cruise Control is active, the Resume/Accel input c an be used to increase

power and speed by toggling the switch. Momentarily toggling and releasing the Resume/Accel switch will increase the set point by 1 MPH increments for Vehicle Speed Cruise Control and 25 RPM increments for Engine Speed Cruise Control. Holding the Resume/Accel will increase the set point by 1 MPH per second (Vehicle Speed CC) or 25 RPM per seconds (Engine Speed CC). When released the Cruise Control set point will be at the new speed.

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DDEC IV APPLICATION AND INSTALLATION MANUAL

Clutch Released (Manual Transmissions)

This input indicates that the clutch is released and is used for suspending Cruise Control and Auto Resume.

When the clutch is released, the input is at battery ground. Cruise Control is suspended if the clutch is depressed once. If the clutch is depressed twice within three seconds, Cruise Control is automatically resumed.

NOTE:

When engine brake is configured and auto resume is enabled, the first time the clutch is depressed to suspend Cruise Control, the engine brakes will be delayed for three seconds.

The digital input logic for the Clutch Switch disables Cruise Control in the unlikely event of a broken clutch switch wire.

Service Brake Released (Automatic and Manual Transmissions)

This input indicates that the brake is released when switched to battery ground. If the bra ke is activated, then the input is not grounded and Cruise Control is suspended. Cruise Control is resumed by using the Resume/Accel Switch.

The input logic for the Brake Switch disables Cruise C ontrol in the unlikely event of a broken brake switch wire.

5.3.2 INSTALLATION

The following is a list of switches that are required for Cruise Control operation.

Cruise Enable Switch Brake Switch Clutch Switch -- optional for automatic transmissions Set/Coast Switch Resume/Accel Switch Cruise Active Light -- optional

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DDEC FEATURES

See Figure 5-4 for a diagram of the Cruise Control circuit.

Figure 5-4 Cruise Control Circuit

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5.3.3 PROGRAMMING REQUIREMENTS AND FLEXIBILITY

To configure an engine f or Cruise Control, the digital inputs, output and VSS settings listed in Table 5-7 must be selected either with the Vehicle Electronic Programming System (VEPS), the DDEC Reprogramming System (DRS) or on engine order entry. The required and optional digital inputs and outputs are listed in Table 5-7.

Description Type Function Number

Service Brake Released Digital Input 17

Set/Coast Digital Input 20

Resume/Accel Digital Input 22

Cruise Control Enable Digital Input 23

Clutch Released

(required for manual transmissions)

Cruise Control Active Light

(optional for Cruise Control)

Table 5-7 Cruise Control Related Digital Input and Output Signals

Digital Input 18

Digital Output 11

AVeh

icle Speed Sensor must be configured for Vehicle Speed Cruise Control.

Refer to section 3.14.25, "Vehicle Speed Sensor," for additional inf ormation. If Eaton Smart Cruise is installed on the ve hicle, the feature as listed in Table 5-8 must be

abledbyVEPSorDRS.

Parameter Description

Adaptive Cruise Control

(Smart Cruise)

Enables or disables the Smart Cruise Control feature. YES, NO

Choice

Table 5-8 Smart Cruise Parameter

The Cruise Control parameters listed in Table 5-9 can be set by order entry, DDR, DDDL, the DRS, or VEPS.

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DDEC FEATURES

Parameter Description Range

CRUISE CONTROL

MIN CRUISE SPEED Sets the maximum cruise speed in MPH or KPH.

MAX CRUISE MPH or KPH Sets the maximum cruise speed in MPH or KPH.

AUTO RESUME

CRUISE SWITCH VSG

INITIAL VSG SET SPEED Sets the cruise switch VSG initial set speed.

RPM INCREMENT Sets the cruise switched VSG RPM increment. 1to255RPM

CRUISE/ENGINE BRAKE

FEATURE

CRUISE/ENGINE BRAKE

ACTIVATION SPEED

ENG BRAKE INCREMENT

MPH or KPH

MAX OVERSPEED LIMIT

MAX SPEED NO FUEL

Enables or disables the vehicle speed Cruise Control feature.

20 MPH to MAX

MIN CRUZ to Vehicle

Speed Limit or 127 mph

Enables or disables the automatic Cruise Control set speed resume feature.

Enables or disables the cruise switch VSG set speed feature.

VSG MIN RPM to

VSG MAX RPM

Enables or disables the feature that allows the engine brake to be used while on Cruise Control if the vehicle exceeds the cruise set speed.

Sets the additional speed before the engine brake is applied to slow down the vehicle. The engine brake is activated at low level unless the operator has turned off the engine brakes with the dash board switches.

Sets the additional incremental speed that must be reached before the engine brake will activate the medium and/or high level of retardation.

Sets the vehicle speed above which a diagnostic code will be logged if the driver fuels the engine andexceedsthislimit.Enteringa0willdisable this option.

Sets the vehicle speed above which a diagnostic code will be logged if the vehicle reaches this speed without fueling the engine. Entering a 0 will disable this option.

YES, NO

CRUZ SPD

if VSL = NO

YES, NO

0to10MPH

1to5MPH

0to127MPH

Table 5-9 Cruise Control Parameters

5.3.4 DIAGNOSTICS

Two faults (SID 216 FMI 14 and PID 86 FMI 14) will be logged simultaneously if Smart Cruise is enabled and the data is not being received, the received data is ba d or the Smart Cruise unit has been removed.

If these faults are received in addition to an SAE J1939 Data Link failure (SID 231 FMI 12) , then the problem is with the SAE J1939 Data Link itself.

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5.3.5 INTERACTION WITH OTHER FEATURES

The Cruise Control logic i s also used with the DDEC Pressure Sensor Governor in fire trucks. Both systems cannot be configured on the same engine. Refe r to section 5.29 for more information on the Pressure Sensor Governor. DDEC can be configured to allow the engine brakes to a ctivate during Cruise Control operation.

NOTE:

Cruise Control maximum speed cannot exceed the vehicle speed limit.

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5.4 CRUISE CONTROL FOR DRILLIN G/PUMPING APPLICATIONS WITH OPTIO NAL DUAL STATION CONTROL

Cruise control for drilling/pumping applications is an optional DDEC feature that allows the setting of a targeted engine speed and a easy return to the targeted speed from idle.

For example, petroleum mud pumps are used to supply fluid to a drilling bit when a well is being drilled. The operator will carefully adjust engine speed until he/she achieves the desired pumping rate. The optimum speed will vary from job to job. The operator will continue until a new section of drilling pipe must be added. At that point, the engine must be brought back to idle and the transmission or clutch disengaged while new pipe is threaded in place. The operator can then bring the engine back up to operating speed and continue the drilling and pumping operation.

5.4.1 OPERATION

This feature allows the operator to set an engine speed during the drilling and pumping process, drop to idle speed, and then return to the original speed. Returning to the original set speed is desirable since it has been carefully dialed in by the operator and is ideal for the particular job. The Engine Speed Cruise Control feature would work to provide the desired engine set speed for the pumping operation, but it is not configured to resume speed from engine idle.

This process operates as follows:

1. Start the engine, idle, and warm up.

2. Engage the ALT_MIN_VSG Switch - engine goes to ALT_MIN_VSG speed (e.g. 650 rpm).

3. Engage the Cruise Enable Switch.

4. Adjust the hand throttle to the desired speed, e.g. 1700 rpm.

5. Engage set/coast - sets speed to the desired speed, 1700 rpm.

6. Adjust the hand throttle back to idle position.

7. When the need to add pipe arises, engage the brake switch. The engine drops to 650 r pm.

8. When ready to continue, engage Resume/Accel and the spee d returns to 1700 rpm.

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DDEC FEATURES

5.4.2 PROGRAMMING REQUIREMENTS & FLEXIBILITY

The hardware and software configuration include the proper 6N4C group for VSG engine governing such as 06N04C0720 a nd customer selectable parameters.

The customer selectable parameters settings are listed in Table 5-10.

Parameter Description

Cruise Control Enable Enables the engine speed cruise control feature. YES

Alternate Minimum VSG Sets the Alternate Minimum VSG speed

(set above the idle speed)

Setting

650 RPM

Table 5-10 Customer Selectable Parameters

The digital inputs listed in Table 5-11 must be programme d.

Description Type Function Number

Cruise Enable Digital Input 23

Set/Coast Digital Input 20 Resume/Accel Digital Input 22 Service Brake Digital Input 17

Alt Min VSG Digital Input 16

Table 5-11 Digital Inputs

5.4.3 DUAL STATION CONTROLS

This feature will also work with dual control stations. The operator has the capability of starting the engine at Station 1 mounted near the engine, follow the operation procedure above, and while at the desired operating speed, switch to throttle Station 2 and adjust engine speed remotely, if desired. The operator could then switch back to Station 1 when pipe was to be added.

For dual station controls, the digital inputs listed in Table 5-10 are required in addition to the digital inputs listed in Table 5-12.

Description Type Function Number

VSG Station Change Digital Input 33

VSG Station Change C omplement Digital Input 34

Table 5-12 Additional Dual Station Control Digital Inputs

For additional installation information on VSG Dual Station Controls, refer to section, 4.31 "Throttle Controls/Governors".

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5.5 DIAGNOSTICS

Diagnostics is a standard feature of the DDEC system. The purpose of this feature is to provide information for problem identification and problem solving in the form of a code. The ECM continuously performs self diagnostic checks and monitors the other system components. Information for problem identification and problem solving is enhanced by the detection of faults, retention of fault codes and separation of active from inactive codes.

5.5.1 OPERATION

The e ngine-mounted ECM includes control logic to provide overall engine management. System diagnostic checks are made at ignition on and continue throughout all engine operating modes.

Sensors provide information to the ECM regarding various engine and vehicle performance characteristics. The information is used to regulate engine and vehicle per forma nce, provide diagnostic information, and activate the engine protection system.

Instrument panel warning lights (see Figure 5-5), the Check Engine Light (CEL) and the Stop Engine Light (SEL), warn the engine operator. The CEL is an amber light and the SEL is a red light.

Figure 5-5 Typical Diagnostic Request/SEO Switch and Warning Lights

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DDEC FEATURES

The C EL is illuminated and a code is stored if an electronic system fault occurs. This indicates the pr oblem should be diagnosed as soon as possible. The ECM illuminates the CEL and SEL and stores a malfunction code if a potentially engine damaging fault is detected. Th ese codes can be accessed in one of four ways:

Using the Diagnostic Data Reader (DDR) Flashing the CEL and SEL with the Diagnostic Request Switch (may be combined with

Stop Engine Override switch, see Figure 5-5) Using the Detroit Diesel Diagnostic Link™ (DDDL) PC software package By ProDriver®, Electronic Fire Commander™, Electronic Display Module (EDM), or

other display

There are two types of diagnostic codes:

An active code - a fault present at the time when checking for codes An inactive code - a fault which has previously occurred; inactive codes are logged into

the ECM and time stamped with the following information:

First occurrence of each diagnostic code in engine hours

Last occurrence of each diagnostic code in engine hours

Total time in seconds that the diagnostic code was active

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Diagnostic Request Switch

The Diagnostic Request Switch is used to activate the CEL/SEL to flash codes. Active codes are flashed on the SEL and inactive codes are flashed on the CEL (see Figure 5-6). Inactive c odes are flashed in numeric al order, a ctive codes are flashed in the order received, most recent to least recent. The Diagnostic Request Switch can also be used as the Stop Engine Override (SEO) Switch. The codes are flashed out of the ECM connected to the switch.

Figure 5-6 Flash Codes NOTE:

For multi-ECM installations, the Diagnostic Request Switch and SEO are combined on the master ECM. All receiver ECMs have a separate Diagnostic Request Switch.

The Diagnostic Request Switch is used to flash codes in the following circumstances:

The engine is not running a nd ignition is ON The engine is idling

In both circumstances, activating and holding the Diagnostic Request Switch will flash out the diagnostic codes.

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DDEC FEATURES

Diagnostic Request Switch/Stop Engine Override

If no separate Diagnostic Request Switch is configured, the SEO Switch serves as both a Diagnostic Request Sw itch and an SEO Switch.

The Diagnostic Request/Stop Engine Override Switch is used to flash codes in the following circumstances:

The engine is not running and ignition is on The engine is idling

In both circumstances, activating and releasing the switch will flash out the diagnostic codes; activating and releasing the switch a second time will stop the ECM from flashing the diagnostic codes. Codes will also cease flashing if the engine is no longer at idle. The codes are flashed out of the ECM connected to the switch.

NOTE:

For multi-ECM installations, the Diagnostic Request Switch and SEO Switch are combined on the master ECM. All receiver ECMs have a separate Diagnostic Request Switch.

5.5.2 DEFINITIONS AND ABBREVIATIONS

Parameter Identification Character (PID): A PID is a single byte character used in SAE J1587 messages to identify the data byte(s) that follow. PIDs in the range 0-127 identify single byte data, 128-191 identify double byte data, and 192-253 identify data of varying length.

Subsystem Identification Character (SID): A SID is a single byte cha racter used to identify field-repairable or replaceable subsystems for which failures can be detected or isolated. SIDs are used in conjunction with SAE standard diagnostic codes defined in SAE J1587 within PID 194.

Failure Mode Identifier (FMI): The FMI describes the type of failure detected in the subsystem and identified by the PID or SID. The FMI and either the PID or SID combine to form a given diagnostic code defined in SAE J1587 within PID 194.

Flashing Codes: Provides a two digit number (see Figure 5-6). This code may cover several specific faults. It is provided to advise the operator of the general severity of the fault so the operator can decide if engine operation can continue without damaging the engine.

Refer to Appendix A for a list of codes, the code number when flashed, the SAE J1587 number and a description of each code.

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DDEC IV APPLICATION AND INSTALLATION MANUAL

5.6 EDM AND AIM

The Construction and Industrial Electronic Display Module (EDM) and Auxiliary Information Module (AIM) are the two components which comprise the Detroit Diesel Construction and Industrial Electronic Display system for engine and equipment parameters.

5.6.1 OPERATION

The EDM (see Figure 5-7) m ay be used alone to display engine parameters or in conjunction with the AIM to display additional equipment parameters. AIM cannot be used without the EDM.

Figure 5-7 Electronic Display Module

The EDM will display the following parameters at all times if the sensor is installed on the equipment:

Engine RPM Engine Coolant or Oil Temperature (Oil Temperature only when coolant temperature is unavailable from the ECM) Engine Oil Pressure ECM Battery Voltage or Auxiliary Current (Requires AIM) - (Battery Voltage display) Vehicle Speed or Auxiliary Pump Pressure or Engine Load Equipment Temperature or Pressure (Requires AIM) Equipment Temperature or Pressures (Requires AIM) or Engine Turbo Boost Pressure Fuel Level (Requires AIM)

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DDEC FEATURES

Check and Stop Indicators

The AI M (see Figure 5-8) is used in conjunction with the EDM to display additional equipment parameters.

Figure 5-8 Auxiliary Interfa

ce Module

5.6.2 INSTALLATION

For information on installing the Construction and Industrial EDM and AIM refer to the Construction & Industrial EDM and AIM Installation and Troubleshooting manual ( 7SA801).

5.6.3 PROGRAMMING REQUIREMENTS AND FLEXIBILITY

Refer to Const (7SA801).

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DDEC IV APPLICATION AND INSTALLATION MANUAL

5.6.4 INTERACTION WITH OTHER FEATURES

DDEC installations equipped with both the EDM and AIM may initiate engine shutdowns based on equipment parameters. The shutdown option include the standard 30 second shutdown as well as an option for an immediate engine shutdown.

5.6.5 DIAGNOSTICS

Refer to the Construction & Industrial EDM and AIM Installation and Troubleshooting manual (7SA801).

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Allison Transmission DDEC IV Service Manual

Specifications and Main Features

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User Manual