17-2713b

Page 1 of 7WAUKESHA ENGINEDRESSER, INC.WAUKESHA, WI 53188-4999Waukesha

TOPIC: Electronic ControlsIDENT NO: 17--2713B

SUPERSEDES: 17--2713ADATE: May 15, 2001

SUBJECT: CEC AFM Software Version Update And Retrofit Instructions

MODELS AFFECTED: ATGL, VHP, VGF

The purpose of this service bulletin is to identify thecurrent software version of the Custom Engine Con-trol Air/Fuel Module (AFM) User Interface Program,provide retrofit information, explain software andEPROM chip compatibility, and provide atmosphericpressure transducer installation instructions.

The AFM User Interface Program has been updated.The current version of the AFM software is version 4.0a(P/N 740411D) replacing version 4.0 (P/N 740411C)and version 2.8a (P/N 740411B). All existing AFMmodules in the field, regardless of software version, canbe retrofitted to AFM version 4.0a.

The upgrade to version 4.0a allows the AFM UserInterface Program to run on PCs with high speedprocessors (750 MHz or less). With previous versionsof AFM software, PCs with high speed processorscould not be used to program the AFM. This latestsoftware release corrects this error. If you are currentlyrunning your AFM system using version 4.0 and areunable to program the AFM system due to a highprocessor speed, you must upgrade your AFM softwareto version 4.0a.

NOTE: Refer to the Custom Engine Control Air/FuelModule Installation, Operation and MaintenanceManual, Form 6286 (First Edition) for more informationon the AFM system, installation, and programming.

AFM FEATURES(SOFTWARE VERSION 4.0a)

DUAL FUEL CAPABILITY

The AFM allows for dual fuel applications. Dual fuelcapability allows for control of air/fuel ratio on enginesthat have two discrete fuel sources. Dual fuel engineapplications can either be designed to be a “simple” fuelsystem or “complex” fuel system.

• Simple Fuel Systems: A “simple” fuel system iswhen the same regulators and actuators are used forboth primary and secondary fuels.

•• On VHP inline, all VGF and all ATGL engines, theprimary and secondary fuels are regulated byone actuator and one regulator.

•• On VHP vee engines one actuator is used oneach engine bank (a total of two actuatorsinstalled on the engine). On each engine bank,the primary and secondary fuels are regulated byone actuator and one regulator.

When operating a simple fuel system, a differentdata--set for each fuel is programmed, but the AFMUser Interface Program only tracks for the fuelcurrently being used. Because there is only oneactuator, the engine will have to be shut down and thestart position re--initiated to switch fuels/maps.

• Complex Fuel Systems: A “complex” fuel system iswhen both fuels have their own regulator andactuator.

•• On VHP inlines, all VGF, and all ATGL enginestwo actuators are used: one actuator for primaryfuel and one for secondary fuel.

•• On VHP vee engines, four actuators are used onthe engine. Two actuators are used per enginebank. On each bank, one actuator regulatesprimary fuel and one regulates secondary fuel.

When operating a complex fuel system, a differentdata--set for each fuel is programmed and the AFMUser Interface Program keeps track of each actuatorposition. Because two positions are tracked, there isno need to shut down the engine or re--initiate thestart position when switching fuels (as long as thestart positions were initiated once before starting theengine).

REMOTE START CAPABILITY

The AFM offers remote start capability that allows anoperator to activate certain AFM functions from aremote location. The operator can operate the AFM’scontrol logic remotely over telephone lines or a networkusing on--site logic controls. Instead of being at theengine and using the manual mode to start the engine

CECCEC

Service Bulletin No. 17--2713B


with AFM, the start position can be set for auto modeand closed loop control.

INTAKE MANIFOLD PRESSURE TRANSDUCERRANGE

The intake manifold pressure transducer range is0 -- 100 psi. Maps in the AFM User Interface Programare designed to run at high pressures (up to 60 psia).With this pressure range, engines with higher intakemanifold pressure requirements can be accommo-dated. The intake manifold pressure transducer is usedin catalyst and lean burn applications only.

In addition, a pressure snubber is installed between theintake manifold pressure transducer and the intakemanifold to protect the transducer from exposure toexcessive pressures that can result from intake man-ifold explosions or surges.

ATMOSPHERIC PRESSURE TRANSDUCER(LEAN BURN ONLY)

An atmospheric pressure transducer is installed in theAFM module to improve overall system accuracy whenusing lean burn control mode (see Figure 1).

Figure 1. Atmospheric Pressure Transducer InstalledIn AFM Module

ATMOSPHERICPRESSURE

TRANSDUCER

ENGINE LOADED PRECAUTION

If the intake manifold pressure is greater than 17 psia,the operator cannot set the actuator(s) to the startposition using the <F1> <STRT POS> command. If theoperator presses <F1> and then <STRT POS> on theAFM module keypad, a message will be displayed onthe AFM LCD telling the operator that the request wasignored because the engine is loaded. This preventserrant shutdowns and damage to engine componentsthat might occur should the engine be loaded and the<F1> <STRT POS> command used.

ACTUATOR DESIGN

The actuator was designed for operator convenience.The proximity switch is located inside the actuatorhousing to prevent accidental breakage. The small sizeand weight of the actuator results in less chance ofvibration damage to engine components and makes iteasier to package the actuator to the engine.

HIGHER PROCESSOR SPEED

Version 4.0a has the system capability to run the AFMUser Interface Program on PCs with high speedprocessors (750 MHz or less).

AFM RETROFIT INFORMATION ANDPART NUMBERS

All existing AFM modules in the field, regardless ofsoftware version, can be retrofitted to AFM version 4.0a.

COMPONENTS NEEDED FOR RETROFIT FROMVERSION 4.0

To upgrade to version 4.0a from version 4.0, it is onlynecessary to install the new software on your PC andthen program the AFM system using the new software.Program your AFM module using software version 4.0afollowing the programming instructions provided in oneof the following chapters in the Custom Engine ControlAir/Fuel Module Installation, Operation and MaintenanceManual Form 6286 (First Edition): Chapter 3 for CatalystProgramming, Chapter 4 for Best Power/Economy Pro-gramming, or Chapter 5 for Lean Burn Programming.

COMPONENTS NEEDED FOR RETROFIT FROMVERSION 2.8a

To upgrade to AFM version 4.0a and use the featuresassociated with the new software, you need to upgradeor install the components listed in Table 1. On lean burnengines, you must also install the atmospheric pressuretransducer assembly. The components of the atmo-spheric pressure transducer are listed in Table 2.



Table 1. Components Needed For AFM 4.0a Retrofit(Rich Burn And Lean Burn)

QTY. DESCRIPTION P/N

1 Core EPROM Chip 740407B

1 Display EPROM Chip 740408B

1 Software/Manual Assembly C740015B

1 Intake Manifold Pressure Transducer1,2 740111C

1 Pressure Snubber2(If Not Already Installed) 211893

NOTE: 1 You must use intake manifold pressure transducerP/N 740111C (or superceding P/N) with AFM version 4 seriessoftware. This pressure transducer has a range of 0 -- 100 psi.Using an incorrect pressure transducer, will cause the AFM’s mapstructure to be incorrect resulting in poor engine performance.2 The intake manifold pressure transducer with pressure snubber isnot used in Best Power/Economy operation.

Table 2. Atmospheric Pressure Transducer AssemblyComponents (Lean Burn Only)

QTY. DESCRIPTION P/N

1 MAP Sensor 740113

1 MAP Sensor Connector Assembly 740115

2 #10--24 x 3/4″ Headscrew 21834

2 #10 Flat Washer Y18813E

2 #10--24Flex Lock Nut 28700

1 1/4--20 Flex Lock Nut 28102

1 Mounting Plate Assembly A214027

1 3/16″ OD Tubing 296438

NOTE: The actuator used with previous AFM versionsis interchangeable and can be used with AFM version4.0a. You do not need to retrofit the actuator. Thecurrent actuator features a smaller size and relocatedproximity switch. If you want to upgrade your actuator(s),refer to Table 3 for correct part numbers.

Table 3. Upgraded Actuator Part Numbers

ENGINES USING ... ORDER ACTUATORP/N1

S211, S201, 66, 66Z, or 133LFisher gas regulator(s) A740500A

99 or 1098 Fisher gas regulator(s) A740502A

NOTE: 1If you upgrade your actuator(s), you will also need to ordera new harness(es) (P/N 740207C). The same harness is used forboth actuator sizes. The harness being replaced is the harness thatconnects the actuator to the junction box. The harness thatconnects the junction box to the AFM module does not need to bereplaced.

AFM 4.0a RETROFIT INSTRUCTIONSFROM AFM 2.8a

The following sections provide AFM 4.0a retrofit instruc-tions from version 2.8a for the EPROM chips, UserInterface Program, intake manifold pressure transducerwith snubber, actuator, and atmospheric pressuretransducer (lean burn only). Complete the entire AFM4.0a retrofit following the instructions in this servicebulletin.

When the entire retrofit is complete, program your AFMmodule using software version 4.0a following theprogramming instructions provided in one of thefollowing chapters in the Custom Engine Control Air/FuelModule Installation, Operation and Maintenance ManualForm 6286 (First Edition): Chapter 3 for CatalystProgramming, Chapter 4 for Best Power/EconomyProgramming, or Chapter 5 for Lean Burn Programming.

CORE AND DISPLAY EPROM CHIP RETROFIT

If you upgrade to version 4.0a from version 2.8a, thecore and display EPROM chips inside the AFM modulemust be updated. EPROM chip upgrading is necessarybecause the core and display EPROM chips must be“matched” with the AFM software version number forcorrect compatibility. If the versions of the EPROM chipsare not the same as the software version number, thepotential for errant operation exists and programmingwill not work.

NOTE: If you are upgrading to version 4.0a fromversion 4.0, you do not need to upgrade EPROM chips.

Refer to Section 6.05 “EPROM Chip Replacement” inthe Custom Engine Control Air/Fuel Module Installation,Operation and Maintenance Manual Form 6286(First Edition) for instructions on replacing the core anddisplay EPROM chips inside the AFM module.

The version number is labeled on the top of the EPROMchips. AFMDXX is labeled on the display EPROM andAFMCXX is labeled on the core EPROM (where XX isthe version number) (see Figure 2). Table 4 lists thesoftware and EPROM chip part numbers required forproper operation.



Figure 2. Core And Display EPROM Chips

LABEL WITHVERSION NUMBER

Table 4. AFM User Interface Program Version 4.0aEPROM Requirements

VERSION DISK P/N DISPLAYEPROM P/N

COREEPROM P/N

4.0A 740411D 740408B 740407B

For example: AFMD40 (display EPROM P/N 740408B)and AFMC40 (core EPROM P/N 740407B) are thechips that have been programmed for AFM UserInterface Program version 4.0a.

NOTE: The display EPROM is visible inside the AFMmodule on the back of the door. To view the coreEPROM, the control board assembly must be removedand disassembled. Refer to Section 6.05 “EPROM ChipReplacement” in the Custom Engine Control Air/FuelModule Installation, Operation and Maintenance ManualForm 6286 (First Edition) for disassembly instructions.

USER INTERFACE PROGRAM SOFTWAREINSTALLATION

For information on installing the AFM User InterfaceProgram, refer to the white card at the back of theCustom Engine Control Air/Fuel Module Installation,Operation and Maintenance Manual Form 6286(First Edition) that holds the 3-1/2 inch diskette.

INTAKE MANIFOLD PRESSURE TRANSDUCERAND PRESSURE SNUBBER RETROFIT

NOTE: The intake manifold pressure transducer withpressure snubber is used in catalyst and lean burnapplications only.

Refer to Section 2.00 “Mounting AFM System Compo-nents” in the Custom Engine Control Air/Fuel ModuleInstallation, Operation and Maintenance ManualForm 6286 (First Edition) for instructions on mountingthe intake manifold pressure transducer with pressuresnubber. The mounting instructions are onPage 2.00-16 of the manual under the heading, “Mount-ing The Intake Manifold Pressure Transducer WithPressure Snubber.”

The wiring schematics for the AFM system are locatedin Section 2.05 AFM System Electrical Connections ofthe manual. Refer to the appropriate wiring schematic toconnect the intake manifold pressure transducer to theAFM system. The intake manifold pressure transducerhas three wires identified “1,” “2,” and “3.” See Table 5for wire identification.

Table 5. Intake Manifold Pressure Transducer WireIdentification

WIRE NUMBER FUNCTION

1 SUPPLY +

2 SUPPLY / SIGNAL --

3 SIGNAL +

ACTUATOR RETROFIT

NOTE: The actuator used with previous AFM versionsis interchangeable and can be used with AFM ver-sion 4.0a. You do not need to upgrade the actuator.

Refer to Section 2.00 “Mounting AFM System Compo-nents” in the Custom Engine Control Air/Fuel ModuleInstallation, Operation and Maintenance ManualForm 6286 (First Edition) for instructions on mountingthe upgraded actuator(s). The mounting instructionsbegin on Page 2.00-16 of the manual under theheading, “Mounting The Stepper Motor(s).”

The wiring schematics for the AFM system are locatedin Section 2.05 AFM System Electrical Connections ofthe manual. Refer to the appropriate wiring schematic toconnect the actuator to the AFM system.



INSTALLING ATMOSPHERIC PRESSURETRANSDUCER (LEAN BURN ONLY)

When using lean burn control mode, an atmosphericpressure transducer must be installed in the AFMmodule to improve overall system accuracy (seeFigure 3). Follow the instructions provided to install theatmospheric pressure transducer in the AFM module.

ATMOSPHERIC PRESSURETRANSDUCER

Figure 3. Atmospheric Pressure Transducer InstalledIn AFM Module

Do not install, set up, maintain, or operate anyelectrical components unless you are a technicallyqualified individual who is familiar with the electri-cal elements involved. Electrical shock can causesevere personal injury or death.

Disconnect all electrical power supplies beforemaking any connections or servicing any part of theelectrical system. Electrical shock can cause se-vere personal injury or death.

1. Turn off 24 VDC power to the AFM module.

2. Open the AFM module.

3. Remove the two #10--24 x 1/2″ screws (locationshown in Figure 4) from the plate on the bottom of theAFM module and discard.

SCREWS TO BEREMOVED

Figure 4. Location Of Screws To Be Removed FromBottom Of AFM Module

4. Replace the two screws removed in Step 3 with#10 flat washers (P/N Y18813E) and #10--24 x 3/4″head screws (P/N 21834) (see Figure 5).

5. Place the mounting plate (P/N A214027) inside theAFM module over the threads from the screws installedin Step 4. Make sure the stud on the mounting plate isup and that the tab on the plate is in front (see Figure 5).

6. Secure the mounting plate inside the AFM modulewith two #10--24 lock nuts (P/N 28700).



Figure 5. Atmospheric Pressure Transducer Components Installed In AFM Module

#10 FLAT WASHERP/N Y18813E

#10--24 HEAD SCREWP/N 21834

#10--24 LOCK NUTP/N 28700

MOUNTING PLATEP/N A214027


P/N 740113

SENSOR CONNECTOR ASSEMBLYP/N 740115

3/16″ OD TUBINGP/N 296438

1/4--20 LOCK NUTP/N 28102

Figure 6. Pressure Transducer Aligned With Mounting Plate

VIEW FROM BOTTOM OF AFM MODULE

ALIGN ATMOSPHERIC PRESSURETRANSDUCER WITH TAB ON

MOUNTING PLATE

MOUNTING PLATE


7. Slide the atmospheric pressure transducer(P/N 740113) over the mounting plate stud (seeFigure 5). Align the pressure transducer with the tab onthe mounting plate as shown in Figure 6.

8. Secure the atmospheric pressure transducer to themounting plate stud with the 1/4--20 lock nut(P/N 28102).

9. Locate the sensor connector assembly(P/N 740115).

10. Align plug tabs of sensor connector with theatmospheric pressure transducer.

11. Snap sensor connector into the atmospheric pres-sure transducer (see Figure 5).

12. Route the sensor connector assembly wires insidethe AFM module to the correct location on the terminalidentification strip: ANALOG IN 2+, ANALOG IN 2--,and LEFT HOME + (see Figure 7).

13. Cut wires to length and strip ends of wire.



14. Loosen the screws at the ANALOG IN 2+,ANALOG IN 2--, and LEFT HOME + terminals in theAFM module (see Figure 7).

15. Insert wires into the correct terminal and tightenterminal screws. Wires are marked for proper locationon the terminal strip.

16. Locate 3/16″ tubing (P/N 296438).

17. Slide one end of 3/16″ tube over the orifice on theatmospheric pressure transducer.

18. Using a nylon cable strap, secure the other end ofthe tubing to the pressure transducer bracket. Makesure tube opening faces down as shown in Figure 5.

19. Complete entire AFM 4.0a retrofit including the newEPROM chips, software, and intake manifold pressuretransducer with pressure snubber following the instruc-tions in this service bulletin.

20. Program the AFM module using softwareversion 4.0a following the programming instructionsprovided in Chapter 5 “Lean Burn Programming” of thethe Custom Engine Control Air/Fuel Module Installation,Operation and Maintenance Manual Form 6286(First Edition). -

Figure 7. Atmospheric Pressure Transducer Wiring Inside AFM Module

24V

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17-2713b