JB4 Port injection and Flex Fuel Analyzer Wiring Guide   
 
 
General Flex Fuel Installation Instructions (V17):  
Red wire:  Connect to 12 volts switched, if you use 12 volts constant, that's fine but install a fuse.  
Black wire:  Connect to chassis ground.  
White wire: This connection is optional, see platform specific instructions below for integration with the JB4.  If connecting to an Analog gauge, it must accept a 0-5 volt input or a .5 to 4.5 volt input.  
NOTE:  White wire connection for ethanol analyzer is optional and does not need to be connected to use the Bluetooth Fuel-It! app.  
NOTE:  Do not attempt to pair the ethanol analyzer to your mobile device, just open the Fuel-It! app and select "CONNECT".  
   
Acura Platform Engine Device Wire Color Connects to… Additional notes    
All All Flex Fuel Analyzer Power Red 12 volts Fuse box    
Ground Black Chassis ground Any good ground point in the engine bay    
Signal White Pin 16 on JB4 DB25 connector (enable ethanol setup bit 1) Set Meth signal scaling to 100    
     
   
Alfa Romeo      
Platform Engine Device Wire Color Connects to… Additional notes  
All All Flex Fuel Analyzer Power Red 12 volts Fuse box  
Ground Black Chassis ground Any good ground point in the engine bay  
Signal White Pin 4 on JB4 DB25 connector (enable ethanol setup bit 0)    
   
   
Aston Martin      
Platform Engine Device Wire Color Connects to… Additional notes    
All All Flex Fuel Analyzer Power Red 12 volts Fuse box  
Ground Black Chassis ground Any good ground point in the engine bay  
Signal White Pin 16 on JB4 DB25 connector (enable ethanol setup bit 1) Set Meth signal scaling to 100  
     
   
       
  Platform Engine Device Wire Color Connects to… Additional notes  
BMW E-Series N54 Port Injection Controller Power Red 12V switched Green connector in DME box, connect to either orange wire  
Ground Black Chassis Shock tower  
RPM Purple Pin 21 on JB4 gray connector As marked on the female connector  
TMAP Yellow Pin 9 on JB4 DB9 connector JB4 USB Cable or JB4 mobile connect kit required  
Signal White Pin 15 on JB4 DB25 Connector Set Meth signal scaling to 99 and all fuel biases to 50  
12V trigger Thick Yellow or Orange 12 volt trigger wire for secondary pump (optional) When using this method to trigger the secondary pump, trigger gound wire goes to chassis ground.  
 
   
Flex Fuel Analyzer Power Red 12 volts Either orange wire on the green connector in the DME box is a good source  
Ground Black Chassis ground Shock tower or ground point in engine bay  
Signal White Pin 15 on JB4 DB25 connector (enable ethanol setup bit 1) Alternate location:  DB25 Pin 2 (enable ethanol setup bit 0)  
   
Full Flex Fuel DME Integration Signal White Small black DME connector pin 16                                                (enable JB4 ethanol setup bit 2)    
Engine Device Wire Color Connects to… Additional notes  
N55  (Requires updated JB4 2431 chip)  Port Injection Controller Power Red 12V switched Large red wire in black connector at back of DME box  
Ground Black Chassis Shock tower or ground point in engine bay  
RPM Purple Dark gray/black textured wire in DME box Alternate RPM signal is available on pin 9 of OBDII port  
TMAP Yellow Pin 1 on JB4 DB25 connector    
Signal White Pin 16 on JB4 DB25 Connector Set Meth signal scaling to 99 and all fuel biases to 50  
12V trigger Thick Yellow or Orange 12 volt trigger wire for secondary pump (optional) When using this method to trigger the secondary pump, trigger gound wire goes to chassis ground.  
 
   
Flex Fuel Analyzer Power Red 12 volts Large red wire in black connector at back of DME box  
Ground Black Chassis ground Shock tower or ground point in engine bay  
Signal White DB25 Pin 16 (enable ethanol setup bit 1) Alternate location:  DB25 Pin 3 (enable ethanol setup bit 0)  
  Platform Engine Device Wire Color Connects to… Additional notes  
BMW F-Series B46 & B48 Flex Fuel Analyzer Power Red 12 volts Fuse box  
Ground Black Chassis ground Shock tower or ground point in engine bay  
Signal White DB25 Pin 4 (enable ethanol setup bit 0) JB4 firmware versions prior to V22 will enable bit 2 instead of 0  
Engine Device Wire Color Connects to… Additional notes  
N20 & N26 Flex Fuel Analyzer Power Red 12 volts Fuse box or jump terminal with fuse  
Ground Black Chassis ground Shock tower or ground point in engine bay  
Signal White DB25 Pin 14 (enable ethanol setup bit 1) Alternate location:  DB25 Pin 3 (enable ethanol setup bit 0)  
Engine Device Wire Color Connects to… Additional notes  
N55 PWG (Requires updated JB4 2431 chip)  Port Injection Controller Power Red 12V Attaches to jump terminal with fuse assembly  
Ground Black Chassis Shock tower  
RPM Purple Pin 3 of JB4 OBDII 4 pin connector Insert pin for purple wire into slot below the green wire   
TMAP Yellow Pin 1 on JB4 DB25 connector    
Signal White Pin 16 on JB4 DB25 Connector Set Meth signal scaling to 99 and all fuel biases to 50  
   
Flex Fuel Analyzer Power Red 12 volts Fuse box or jump terminal with fuse  
Ground Black Chassis ground Shock tower or ground point in engine bay  
Signal White DB25 Pin 16 (enable ethanol setup bit 1) Alternate location:  DB25 Pin 3 (enable ethanol setup bit 0)  
Engine Device Wire Color Connects to… Additional notes  
N55 EWG Port Injection Controller Power Red 12V Fuse box or attach to jump terminal with fuse assembly  
Ground Black Chassis Shock tower  
RPM Purple Pin 3 of JB4 OBDII 4 pin connector Insert pin for purple wire into slot below the green wire   
TMAP Yellow Pin 1 on JB4 DB25 connector    
Signal White Pin 14 on JB4 DB25 Connector Set Meth signal scaling to 99 and all fuel biases to 50  
12V trigger Thick Yellow or Orange 12 volt trigger wire for secondary pump (optional) When using this method to trigger the secondary pump, trigger gound wire goes to chassis ground.  
 
   
Flex Fuel Analyzer Power Red 12 volts Fuse box  
Ground Black Chassis ground Shock tower or ground point in engine bay  
Signal White DB25 Pin 14 (enable ethanol setup bit 1) Alternate location:  DB25 Pin 3 (enable ethanol setup bit 0)  
Engine Device Wire Color Connects to… Additional notes  
B58 Port Injection Controller Power Red 12V Fuse box or attach to jump terminal with fuse assembly  
Ground Black Chassis Shock tower  
RPM Purple Pin 3 of JB4 OBDII 4 pin connector Insert pin for purple wire into slot below the green wire   
TMAP Yellow Pin 1 on JB4 DB25 connector    
Signal White Pin 14 on JB4 DB25 Connector Set Meth signal scaling to 99 and all fuel biases to 50  
12V trigger Thick Yellow or Orange 12 volt trigger wire for secondary pump (optional) When using this method to trigger the secondary pump, trigger gound wire goes to chassis ground.  
 
               
Flex Fuel Analyzer Power Red 12 volts Fuse box  
Ground Black Chassis ground Shock tower or ground point in engine bay  
Signal White DB25 Pin 4 (enable ethanol setup bit 0) JB4 firmware versions prior to V22 will enable bit 2 instead of 0  
Engine Device Wire Color Connects to… Additional notes  
N63TU Flex Fuel Analyzer Power Red 12 volts Fuse box  
Ground Black Chassis ground Shock tower or ground point in engine bay  
Signal White DB25 Pin 16 (enable ethanol setup bit 1)    
Engine Device Wire Color Connects to… Additional notes  
S55 Port Injection Controller Power Red 12V Fuse box or attach to jump terminal with fuse assembly  
Ground Black Chassis Shock tower  
RPM Purple Pin 3 of JB4 OBDII 4 pin connector Insert pin for purple wire into slot below the green wire   
TMAP Yellow Pin 1 on JB4 DB25 connector    
Signal White Pin 14 on JB4 DB25 Connector Set Meth signal scaling to 99 and all fuel biases to 50  
12V trigger Thick Yellow or Orange 12 volt trigger wire for secondary pump (optional) When using this method to trigger the secondary pump, trigger gound wire goes to chassis ground.  
 
   
Flex Fuel Analyzer Power Red 12 volts Fuse box  
Ground Black Chassis ground Shock tower or ground point in engine bay  
Signal White DB25 Pin 14 (enable ethanol setup bit 1) Alternate location:  DB25 Pin 3 (enable ethanol setup bit 0)  
Engine Device Wire Color Connects to… Additional notes  
S63TU Flex Fuel Analyzer Power Red 12 volts Fuse box  
Ground Black Chassis ground Shock tower or ground point in engine bay  
Signal White DB25 Pin 16 (enable ethanol setup bit 1)    
  Platform Engine Device Wire Color Connects to… Additional notes  
BMW G-Series B46 & B48 Flex Fuel Analyzer Power Red 12 volts Fuse box or jump terminal with fuse  
Ground Black Chassis ground Shock tower or ground point in engine bay  
Signal White DB25 Pin 4 (enable ethanol setup bit 0) JB4 firmware versions prior to V22 will enable bit 2 instead of 0  
Engine Device Wire Color Connects to… Additional notes  
B58 Port Injection Controller Power Red 12V Fuse box or attach to jump terminal with fuse assembly  
Ground Black Chassis Shock tower  
RPM Purple Pin 3 of JB4 OBDII 4 pin connector Insert pin for purple wire into slot below the green wire   
TMAP Yellow Pin 1 on JB4 DB25 connector    
Signal White Pin 14 on JB4 DB25 Connector Set Meth signal scaling to 99 and all fuel biases to 50  
12V trigger Thick Yellow or Orange 12 volt trigger wire for secondary pump (optional) When using this method to trigger the secondary pump, trigger gound wire goes to chassis ground.  
 
               
CPI FSB Signal Blue JB4 DB25 Pin 14 Enable ethanol setup bit 7 and set all fuel biases to 50  
               
Flex Fuel Analyzer Power Red 12 volts Fuse box  
Ground Black Chassis ground Shock tower or ground point in engine bay  
Signal White DB25 Pin 4 (enable ethanol setup bit 0) JB4 firmware versions prior to V22 will enable bit 2 instead of 0  
Engine Device Wire Color Connects to… Additional notes  
N63TU Flex Fuel Analyzer Power Red 12 volts Fuse box  
Ground Black Chassis ground Shock tower or ground point in engine bay  
Signal White DB25 Pin 16 (enable ethanol setup bit 1)    
Engine Device Wire Color Connects to… Additional notes  
S58 Port Injection Controller Power Red 12V Fuse box or attach to jump terminal with fuse assembly  
Ground Black Chassis Shock tower  
RPM Purple Pin 3 of JB4 OBDII 4 pin connector Insert pin for purple wire into slot below the green wire   
TMAP Yellow Pin 1 on JB4 DB25 connector    
Signal White Pin 16 on JB4 DB25 Connector Set Meth signal scaling to 99 and all fuel biases to 50  
12V trigger Thick Yellow or Orange 12 volt trigger wire for secondary pump (optional) When using this method to trigger the secondary pump, trigger gound wire goes to chassis ground.  
 
   
Flex Fuel Analyzer Power Red 12 volts Fuse box  
Ground Black Chassis ground Shock tower or ground point in engine bay  
Signal White DB25 Pin 4 (enable ethanol setup bit 0)    
Engine Device Wire Color Connects to… Additional notes  
S63TU Flex Fuel Analyzer Power Red 12 volts Fuse box  
Ground Black Chassis ground Shock tower or ground point in engine bay  
Signal White DB25 Pin 16 (enable ethanol setup bit 1)    
  Engine Device Wire Color Connects to… Additional notes  
  S68 Flex Fuel Analyzer Power Red 12 volts Fuse box  
  Ground Black Chassis ground Shock tower or ground point in engine bay  
  Signal White DB25 Pin 4 (enable ethanol setup bit 0)    
     
   
Fiat Abarth      
Platform Engine Device Wire Color Connects to… Additional notes  
All All Flex Fuel Analyzer Power Red 12 volts Fuse box  
Ground Black Chassis ground Any good ground point in the engine bay  
Signal White Pin 16 on JB4 DB25 connector (enable ethanol setup bit 1) Set Meth signal scaling to 100  
   
   
Ford      
Platform Engine Device Wire Color Connects to… Additional notes  
All All Flex Fuel Analyzer Power Red 12 volts Fuse box  
Ground Black Chassis ground Any good ground point in the engine bay  
Signal White Pin 16 on JB4 DB25 connector (enable ethanol setup bit 1) Set Meth signal scaling to 100  
   
   
General Motors      
Platform Engine Device Wire Color Connects to… Additional notes  
All All Flex Fuel Analyzer Power Red 12 volts Fuse box  
Ground Black Chassis ground Any good ground point in the engine bay  
Signal White Pin 16 on JB4 DB25 connector (enable ethanol setup bit 1) Set Meth signal scaling to 100  
   
   
Honda      
Platform Engine Device Wire Color Connects to… Additional notes  
All All Flex Fuel Analyzer Power Red 12 volts Fuse box  
Ground Black Chassis ground Any good ground point in the engine bay  
Signal White Pin 16 on JB4 DB25 connector (enable ethanol setup bit 1) Set Meth signal scaling to 100  
   
   
Infiniti      
Platform Engine Device Wire Color Connects to… Additional notes  
All All Flex Fuel Analyzer Power Red 12 volts Fuse box  
Ground Black Chassis ground Any good ground point in the engine bay  
Signal White Pin 4 on JB4 DB25 connector (enable ethanol setup bit 0)    
   
   
Jeep      
Platform Engine Device Wire Color Connects to… Additional notes  
All All Flex Fuel Analyzer Power Red 12 volts Fuse box  
Ground Black Chassis ground Any good ground point in the engine bay  
Signal White Pin 16 on JB4 DB25 connector (enable ethanol setup bit 1) Set Meth signal scaling to 100  
   
   
Kia Hyundai Genesis      
Platform Engine Device Wire Color Connects to… Additional notes  
All All Flex Fuel Analyzer Power Red 12 volts Fuse box  
Ground Black Chassis ground Any good ground point in the engine bay  
Signal White Pin 4 on JB4 DB25 connector (enable ethanol setup bit 0)    
               
CPI FSB Signal Blue JB4 DB25 Pin 16 Enable ethanol setup bit 7, set meth scaling to 98,                                                       and set all fuel biases to 50 to get started.  
   
   
Lexus      
Platform Engine Device Wire Color Connects to… Additional notes  
All All Flex Fuel Analyzer Power Red 12 volts Fuse box  
Ground Black Chassis ground Any good ground point in the engine bay  
Signal White Pin 16 on JB4 DB25 connector (enable ethanol setup bit 1) Set Meth signal scaling to 100  
   
   
Mazda      
Platform Engine Device Wire Color Connects to… Additional notes  
All All Flex Fuel Analyzer Power Red 12 volts Fuse box  
Ground Black Chassis ground Any good ground point in the engine bay  
Signal White Pin 4 on JB4 DB25 connector (enable ethanol setup bit 0)    
   
   
Maserati      
Platform Engine Device Wire Color Connects to… Additional notes  
All All Flex Fuel Analyzer Power Red 12 volts Fuse box  
Ground Black Chassis ground Any good ground point in the engine bay  
Signal White Pin 16 on JB4 DB25 connector (enable ethanol setup bit 1) Set Meth signal scaling to 100  
   
   
Mclaren      
Platform Engine Device Wire Color Connects to… Additional notes  
All All Flex Fuel Analyzer Power Red 12 volts Fuse box  
Ground Black Chassis ground Any good ground point in the engine bay  
Signal White Pin 16 on JB4 DB25 connector (enable ethanol setup bit 1) Set Meth signal scaling to 100  
   
   
Mercedes Benz      
Platform Engine Device Wire Color Connects to… Additional notes  
All All Flex Fuel Analyzer Power Red 12 volts Fuse box  
Ground Black Chassis ground Any good ground point in the engine bay  
Signal White Pin 16 on JB4 DB25 connector (enable ethanol setup bit 1) Set Meth signal scaling to 100  
   
   
Mini      
Platform Engine Device Wire Color Connects to… Additional notes  
All All Flex Fuel Analyzer Power Red 12 volts Fuse box  
Ground Black Chassis ground Any good ground point in the engine bay  
Signal White Pin 16 on JB4 DB25 connector (enable ethanol setup bit 1) Set Meth signal scaling to 100  
   
   
Subaru      
Platform Engine Device Wire Color Connects to… Additional notes  
All All Flex Fuel Analyzer Power Red 12 volts Fuse box  
Ground Black Chassis ground Any good ground point in the engine bay  
Signal White Pin 16 on JB4 DB25 connector (enable ethanol setup bit 1)    
   
   
Porsche      
Platform Engine Device Wire Color Connects to… Additional notes  
All All Flex Fuel Analyzer Power Red 12 volts Fuse box  
Ground Black Chassis ground Any good ground point in the engine bay  
Signal White Pin 4 on JB4 DB25 connector (enable ethanol setup bit 0)    
   
   
Toyota      
Platform Engine Device Wire Color Connects to… Additional notes  
All All Flex Fuel Analyzer Power Red 12 volts Fuse box  
Ground Black Chassis ground Any good ground point in the engine bay  
Signal White Pin 4 on JB4 DB25 connector (enable ethanol setup bit 0)    
   
   
Volkswagen Audi      
Platform Engine Device Wire Color Connects to… Additional notes  
All All Flex Fuel Analyzer Power Red 12 volts Fuse box  
Ground Black Chassis ground Any good ground point in the engine bay  
Signal White Pin 16 on JB4 DB25 connector (enable ethanol setup bit 1)    
   
   
Volvo      
Platform Engine Device Wire Color Connects to… Additional notes  
All All Flex Fuel Analyzer Power Red 12 volts Fuse box  
Ground Black Chassis ground Any good ground point in the engine bay  
Signal White Pin 16 on JB4 DB25 connector (enable ethanol setup bit 1) Set Meth signal scaling to 100