JET Accu-Speed Installation Instructions
Contents
1. T determine the correct number of turns for the new tire size Using CHART W determine the correct number of turns for the new gear ratio Use the following calculation to determine the correct number of turns of turns for tire size change of turns for gear ratio change 8 correct of turns Set the Accu Speed to the number of turns determined by the above calculation and refer to steps 4 thru 6 above to complete the installation Page 5 YEAR 1992 1997 1998 2004 2007 2008 2009 1992 1997 1998 2002 2003 2005 2003 2005 2006 2007 2010 2006 2010 1992 1993 1994 1996 1994 1996 1997 1998 1999 2006 1998 2001 2002 2003 2004 2005 2006 2007 1995 1997 1992 1993 1994 1996 1997 1998 1999 2001 2002 2004 2005 2008 2009 2010 1997 1998 1999 2001 2002 2004 2005 2007 2008 2010 1998 2000 2001 2005 2006 2007 2009 1992 2001 CHART W Dodge Trucks MODEL Dakota Dakota Durango Dakota Dakota Ram Truck Ram Truck Ram Truck 3 7 4 7 L Ram Truck 5 7 L Ram Truck 3 7L Ram Truck 3 7L Ram Truck 4 7 5 7 L FORD Trucks Bronco Bronco Bronco w 4 wh ABS Expedition Navigator Expedition Navigator Explorer Mountaineer Explorer Mountaineer Explorer Mountaineer Explorer Mountaineer 4 0L Explorer Ranger F 150 F 250 F 350 F 150 F 250 F 350 F 150 F 250 LD 4WD F 150 F 250 LD 4WD F 150 F 250 Classic LD F 150 F250 LD F 150 F250 LD F 250 F 350 HD 2W ABS F 250 F 350 SD Excur2. Grey Black Grey Black Dk Blu Yellow Yellow Orange Grey Black Red Pink Red Pink Grey Black Dark Blue Yellow Lt Green Blk Dark Blue Yellow Brown Green Red Pink Grey Black Grey Black Grey Black Yellow Blue Grey Black Grey Black Grey Black Wht Brown White Orange 1993 1998 1999 2001 2003 2004 2005 2009 2002 2005 1992 1993 2004 2005 2006 2007 2009 1993 1994 1995 2005 2006 2009 1993 1997 1998 2004 2005 2008 1992 1997 1998 2005 2006 2009 2000 2005 2006 04 13 12 Grand Cherokee Grand Cherokee Grand Cherokee Grand Cherokee Liberty Transmission Tranfer case ABS controller pin 13 ABS controller pin 13 Transmission Tranfer case ABS controller pin 13 Wrangler Wrangler Wrangler Wrangler Toyota Trucks 4 Runner 4 Runner 4 Runner Landcruiser Landcruiser Landcruiser Tacoma Tacoma Tacoma Tundra Tundra Transfer case Transfer case Transfer case Transmission Vehicle Speed Sensor Transmission Transmission Transmission Transmission Transmission left side Transmission Transmission Transmission Transmission Transmission Transmission White Orange White Orange Dk Grn Yellow Dark Grn Brown Dk Grn Orange Blue White Orange DrkBlu Orange DkGrn Brown Grey Blue Grey Blue Red Blue Red Green Red Green Red Green Red Green Red Red Blue Yellow Yellow Red E ema size a O 25 26 27 so A CERACSAQA 53 4 43 4 3 3 4 23 4 1 3 4 _3 4 fo 2 11 1410 VAL
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4. JET Accu Speed Installation Instructions Information about your JET Accu Speed The JET Accu Speed interacts with the vehicle speed sensor VSS on your Truck In these vehicles the speed sensor sends pulses to the computer to indicate vehicle speed The computer uses these signals to set speedometer calibration and transmission shift points based on the number of pulses per revolution being sent to it from the VSS By changing the tire size and or gear ratio the number of pulses to the computer are changed Changing these pulses results in the computer reading that the vehicle is at a different speed than it really is As a result the Speedometer calibration is not correct and the transmission shift points are not calibrated correctly The Accu Speed corrects these problems by intercepting the pulses from the VSS and recalibrating them to proper values and sending the corrected signal to the computer BEFORE YOU START THE INSTALLATION READ THIS What you will need to perform the installation of the Accu Speed The Accu Speed installation requires the following tools and materials not supplied with the kit have these on hand before you start the installation Wire Crimping pliers Wire Cutters Phillips Screwdriver Small Flat Blade screwdriver inch nut driver or equivalent Factory Service Manual for Reference Voltmeter or 12v test light Se Ga a Notes on the installation of the JET Accu Speed 1 JET recommends that
5. eed to start over lost count etc turn the adjusting screw 20 turns counterclockwise to put the Accu Speed back to its zero position and start over 3 Remove the rubber plug on the side of the Accu Speed and turn the screw that 1s inside clockwise for the number of turns indicated in the chart 4 Calibration is now complete reinstall the plug in the side of the Accu Speed Recheck all wiring and connections to make sure they all have good contact and make sure all the wires are away from anything hot 5 Reconnect the negative battery cable 6 Test drive the vehicle to verify that the speedometer is functioning correctly The Accu Speed is accurate to within 1 2 there are many ways to verify the calibration of the speedometer including Dynomometer testing checking mile markers comparing to a vehicle with a known correct speedometer or a GPS system If the calibration seems to be off drastically use one of these methods to verify the calibration of the Accu Speed For reference every turn of the adjusting screw is equal to a 1 change Turning the screw counter clockwise will increase the speedometer reading and clockwise will decrease it Page 4 Calibration for GEAR Change Only 1 Use this method if the ONLY change to the vehicle is a gear change Determine the original gear ratio by referring to the build codes located on the inside of the glove box or your original paperwork such as the window sticker from the vehicle U
6. from the factory connector and strip the wires about 14 inch on each end Using the supplied crimp connectors connect one to each end of the wires that you just stripped 4 THIS PART IS CRITICAL IF YOU HOOK THE REMAINING TWO WIRES UP BACKWARDS YOU COULD CAUSE DAMAGE TO THE ACCU SPEED AND OR YOUR VEHICLE SO READ THIS CAREFULLY 5 Connect the Light Green wire from the Accu Speed to the wire still connected to the vehicle speed sensor or the ABS unit using the crimp connector you already installed 6 Connect the Purple wire from the Accu Speed to the remaining wire on the harness side using the crimp connector you already installed Page 3 Calibration procedures for the JET Accu Speed The following information contains the details on how to calibrate the Accu Speed There are multiple ways that the unit can be calibrated please review the following procedures to determine which on is best for your application 1 Calibration for TIRE size change ONLY Use this method if the ONLY change to the vehicle is a tire size change Determine the original factory tire size by either using the chart on page 6 or by measuring the actual tire diameter The original tire size is usually located inside the drivers door jamb 2 Using the stock tire size and the new tire size refer to CHART T to determine the number of turns for the correct setting on the Accu Speed Note One turn means 360 degrees a full turn If for any reason you n
7. sing the stock gear ratio and the new gear ratio refer to CHART G to determine the number of turns for the correct setting on the Accu Speed Note One turn means 360 degrees a full turn If for any reason you need to start over lost count etc turn the adjusting screw 20 turns counterclockwise to put the Accu Speed back to 1ts zero position and start over Remove the rubber plug on the side of the Accu Speed and turn the screw that 1s inside clockwise for the number of turns indicated in the chart Calibration is now complete reinstall the rubber plug in the side of the Accu Speed Recheck all the wiring connections to make sure they all have good contact and make sure all the wires are away from anything hot Reconnect the negative battery cable Test drive the vehicle to verify that the speedometer is functioning correctly The Accu Speed is accurate to within 1 29 there are many ways to verify the calibration of the speedometer including Dynomometer testing checking mile markers comparing to a vehicle with a known correct speedometer or a GPS system If the calibration seems to be off drastically use one of these methods to verify the calibration of the Accu Speed For reference every 4 turn of the adjusting screw is equal to a 1 change Turning the screw counter clockwise will increase the speedometer reading and clockwise will decrease it Calibration for BOTH Tire Size AND Gear Ratio Change 1 Zo 3 Using CHART
8. sion F 250 F 350 SD Excursio F 250 F 350 SD F 250 F 350 SD Ranger Ranger Ranger Ranger Jeep Cherokee P N 50109 50110 Sensor Locations Transfer case transmission ABS controller pin 12 VSS sensor on left rear of transmission VSS sensor on left rear of transmission Transfer case transmission ABS controller pin 12 ABS controller pin 12 ABS controller pin 12 ABS controller pin 21 VSS sensor on left rear of transmission VSS sensor on left rear of transmission Rear Axle Housing Rear Axle Housing ABS controller pin 99 Left side of Transmission Left side of Transmission ABS controller pin 19 PCM Connector pin 68 VSS sensor on left rear of transmission VSS sensor on left rear of transmission Left side of Transmission at Rear Rear Axle Housing Rear Axle Housing Left side of Transmission at Rear Left side of Transmission towards top Rear Axle Housing Left Side of Transmission at Rear Left Side of Transmission at Rear Rear Axle Housing ABS Controller Pin 16 ABS Controller Pin 11 ABS Controller Pin 21 ABS Controller Pin 21 ABS Controller Pin 10 GEM Module Conn Pin 14 PCM Connector pin 68 ABS Controller Pin 21 Transmission Tranfer case WIRE COLOR White Orange White Orange Yellow Pink Yellow Black White Orange White Orange White Orange Dk Grn Yellow Dk Blu Orange Dk Grn Brown Dk Grn Brown Red Pink Red Pink Orange Light Blue Grey Black Dark Blue Yellow
9. that has a 12volt signal any time the ignition switch is in the start or run position only in these positions NOT 12volts all time Use a voltmeter or test light to determine which circuit to use in the fuse block and remove the fuse from that circuit Insert the correct fuse tap there are two different sizes supplied in the kit into the circuit and replace the fuse Disconnect the Negative Battery Cable Cut the RED wire from the Accu Speed to the correct length to reach the fuse box strip the wire about inch and crimp the supplied female spade terminal to the wire Attach the spade terminal to the fuse tap in the fuse box See CHART W to locate the Vehicle Speed Sensor Input wire that you will connect to the remaining two wires on the Accu Speed On some vehicles you will be connecting to wires on the transmission or transfer case and on others you will be connecting to the ABS unit read the chart carefully to determine the correct location for your vehicle and proceed to pages 3 or 4 for the correct instructions for your application Page 2 Connecting the Accu Speed to the Vehicle Speed Sensor 1 Refer to CHART W for the location of the Vehicle Speed Sensor VSS or ABS unit and the wire color for your application Route the remaining two wires Purple and Light Green from the Accu Speed to the VSS or ABS unit keep the wires away from anything hot under the hood 3 Cut the wire in half about 3 4 inches away
10. the Accu Speed be mounted inside the passenger compartment of the vehicle this will protect the unit from the elements and the heat of the engine 2 Mount the unit where you can get to the adjusting screw easily 3 Route all the wires away from anything hot under the hood 4 ALWAYS disconnect the negative battery cable when installing electrical parts Page 1 Detailed Installation Procedures ALL DODGE and FORD Trucks 1 Mount the Accu Speed in the passenger compartment of the vehicle in a location that is accessible so you can adjust it later Use either the supplied sheet metal screws or the supplied Velcro for mounting the unit Make sure the unit is not attached to anything that gets hot Connect the BLACK wire coming out of the Accu Speed to a good ground point using the supplied round terminal Cut the wire to the correct length strip the wire about Y4 inch and crimp the terminal onto the stripped wire Attach the terminal to the ground using an existing screw or one of the supplied sheet metal screws in the kit TIP It s much easier to find an existing screw to attach the terminal to than drilling a new hole Locate the factory fuse block usually located under the dash on the driver s side or on the side of the dash on the drivers side Applications do vary and the correct location of the fuse box can be found in the factory service manual and or the owners manual for the vehicle Find a fuse circuit in the fuse box
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