14 POINT 7
CUTTING EDGE IN MOTION
Warning
- Do not connect or disconnect the Lambda Sensor while Spartan 3 Lite is powered.
- The Lambda Sensor will get very hot during normal operation, please be careful when handling it.
- Do not install the Lambda Sensor in such a manner that the unit is powered before your engine is running. An engine start can move condensation in your exhaust system to the sensor, if the sensor is already heated this can cause thermal shock and cause the ceramic internals inside the sensor to crack and deform.
- While the Lambda Sensor is in an active exhaust stream, it must be controlled by Spartan 3 Lite. Carbon from an active exhaust can easily build up on an unpowered sensor and foul it.
- Lambda sensor life when used with leaded fuels is between 100-500 hrs.
Package Contents
1x Spartan 3 Lite, 1x blade fuse holder, 2x 5 Amp blade fuse, 1x LED
Exhaust Installation
The Lambda sensor should be installed between the 10 o’clock and the 2 o’clock position, less than 60 degrees from vertical, this will allow gravity to remove water condensation from the sensor.
For all Oxygen sensor installations, the sensor must be installed before the catalytic converter.
For normally aspirated engines the sensor should be installed about 2ft from the engine exhaust port. For Turbocharged engines the sensor should be installed after the turbocharger. For Supercharged engines the sensor should be installed 3ft from the engine exhaust port. 
Fuse
Insert 5 amp fuse into fuse holder, cut wire at midpoint, and secure lid. One end of the fuse holder connects to Spartan 3 Lite red wire the other end of the fuse holder connects to a switched 12[v] source, fuel pump relay is normally recommended.
Wiring
| Wire Color | Name | Connects to | Note |
| Red | Power | Switched 12[v] | Use fuse holder, 12[v] should be live only when engine is running. |
| Black | Electronics Ground | Ground | Ground where interfacing device is grounded |
| White | Heater Ground | Ground | Ground to chassis or engine block |
| Green | Linear Output | Interfacing device; ECU/Gauge/datalogger/etc… | 0[v] @ 0.68 [Lambda] Linear to 5[v] @ 1.36 [Lambda], equivalent to 10-20 [AFR] for gasoline fuel |
| Brown | Simulated Narrowband Output | Stock ECU if Lambda sensor replaces stock Narrowband sensor | Stops Stock ECU from throwing out a Check Engine Light when Narrowband sensor is not detected. Switch point @ 1 [Lambda], equivalent to 14.7 [AFR] for gasoline fuel |
| Blue | Sensor Temperature LED Output | Long lead on LED to Blue wire. Short lead on LED to ground. | Very Slow – 1 blink every 8 seconds: waiting for exhaust gas to heat sensor to 350C before heating sensor Slow – 1 blink every 2 seconds: Sensor is heating up/ Sensor is cold Fast – 2 blinks every second: Sensor is too hot Steady – LED is light and not blinking: Sensor is at operating temperature |
| Orange | UART TX | RX of interfacing device | 5v, 9600 Baud, 8 Data Bits, 1 Stop Bit, No Parity, No Flow Control |
| Yellow | UART RX | TX of interfacing device | 5v, 9600 Baud, 8 Data Bits, 1 Stop Bit, No Parity, No Flow Control |
Serial Commands (For advanced users only)
| Serial Command | Usage Note | Purpose | Example | Factory Default |
| GETHW | Gets Hardware Version | |||
| GETFW | Gets Firmware version | |||
| SETTYPEx | If x is 0 then Bosch LSU 4.9 If x is 1 then Bosch LSU ADV | SETTYPE1 | X=0, LSU 4.9 | |
| GETTYPE | Gets LSU sensor type | |||
| SETPERFx | If x is 0 then standard performance of 20ms. If x is 1 then high performance of 10ms. If x is 2 then optimize for lean operation. | SETPERF1 | x=0, standard performance | |
| GETPERFx | Gets performance | |||
| SETLAMFIVEVx.xx | x.xx is a decimal exactly 4 characters long including decimal point. Minimum value is 0.60, maximum value is 3.40 | Sets Lambda at 5[v] for the linear output | SETLAMFIVEV1.36 | x=1.36[Lambda] |
| GETLAMFIVEV | Gets Lambda at 5[v] | |||
| SETLAMZEROVx.xx | x.xx is a decimal exactly 4 characters long including decimal point. Minimum value is 0.60, maximum value is 3.40 | Sets Lambda at 0[v] for the linear output | SETLAMZEROV0.68 | x=0.68[Lambda] |
| GETLAMZEROV | Gets Lambda at 0[v] | |||
| SETNBSWLAMx.xxx | x.xxx is a decimal exactly 5 characters long including decimal point. | Sets the Simulated Narrowband Switch Point in Lambda | SETNBSWLAM1.005 | x.xxx=1.000 |
| GETNBSWLAM | Gets the Simulated Narrowband switch point in Lambda | |||
| SETLINOUTx.xxx | Where x.xxx is a decimal exactly 5 characters long including decimal point, greater than 0.000 and less than 5.00. Linear Output will resume normal operation on reboot. | Allows the user to set the High Perf Linear Output to a specific voltage | SETLINOUT2.500 | |
| SETSLOWHEATx | If x is 0 then sensor is heated at normal rate during initial power up. If x is 1 then sensor is heated at 1/3 the normal rate during initial power up. If x is 3 then wait, a max of 10 min, for exhaust gas to heat sensor to 350C before heating | SETSLOWHEAT1 | X=0, normal sensor heatup rate | |
| GETSLOWHEAT | Gets slowheat setting | |||
| DOCAL | Pull sensor out of the exhaust. Power on wideband controller with sensor connected for about 5 minutes then issue the DOCAL command. If you have the temperature LED installed, please make sure the LED is steady (not blinking) before issuing the DOCAL command. | Do Free Air Calibration and display the value. Recommended for clone sensors only. | ||
| GETCAL | Gets Free Air Calibration value | |||
| RESETCAL | Resets Free Air Calibration value to 1.00 | |||
| SETCANFORMAT0 | Sets Linear Output to Lambda | SETCANFORMAT0 | ||
| SETCANFORMAT4 | Sets Linear Output to %O2: 0v@0%O2 linear to 5v@21%O2 | SETCANFORMAT0 | ||
| GETCANFORMAT | Gets CAN format | |||
| SETAFRMxx.x | xx.x is a decimal exactly 4 characters long including decimal point | Sets AFR Multiplier for Android Torque app | SETAFM14.7 SETAFM1.00 | xx.x=14.7 |
| GETAFRM | Gets AFR Multiplier for Android Torque app | |||
| MEMRESET | Reset to factory settings. |
*All commands are in ASCII, upper/lower case does not matter.
Bootloader
When Spartan 3 Lite is powered up without the LSU Heater Ground connected, it will enter bootloader mode. Powering up Spartan 3 Lite with the Heater Ground connected will not trigger the bootloader and Spartan 3 Lite will work as normal.
Warranty
14Point7 warrants Spartan 3 Lite to be free from defects for 2 years.
Disclaimer
14Point7 is liable for damages only up to the purchase price of its products. 14Point7 products should not be used on public roads.
Spartan 3 Lite v2 User Manual Dec 19 2023
Documents / Resources
 | SPARTAN 3 Lite V2 Lambda Controller [pdf] Instructions 3 Lite V2 Lambda Controller, 3 Lite V2, Lambda Controller, Controller |