SXTune Documentation
Last updated: 7 October 2026
Documentation / ECU technical reference

ECU Technical Reference

Delta 900 ECU technical reference

Hardware identification and connector pin-out.

ECU

Delta 900 ECU
Delta 900 ECU.

Pin-out

Connector pin assignments and electrical descriptions.

Connector A — AMPSeal 776164-1

PinNameDescriptionNotes
1Battery DirectBattery Supply (15A fuse)Direct Battery Power 6-15V
2IgnitionIgnition Switched Supply (10A fuse)Ignition Key Input
3Power Ground 1Power GroundPower Ground
4Low Side Output 13A Open CollectorInjector 1
5Low Side Output 23A Open CollectorInjector 2
6Low Side Output 33A Open CollectorInjector 3
7Low Side Output 43A Open CollectorInjector 4
8Crank/Cam GroundDigital GroundCrank/Cam Sensor Ground
9Crank InputVR/Hall - Software SelectableCrank Sensor Input
10Cam Input 1VR/Hall - Software SelectableInlet Cam Sensor 1 Input
11NTC Input 13.16K pull-up to VREFCoolant Temp Input
12NTC Input 23.16K pull-up to VREFAir Temp Input
13Ignition 1TTL/Power Ignition OutputIgnition 1
14Ignition 2TTL/Power Ignition OutputIgnition 2
15Ignition 3TTL/Power Ignition OutputIgnition 3
16Ignition 4TTL/Power Ignition OutputIgnition 4
17Analog Input 147k pull-up to VREFUser Configurable 0-5V Analog Input
18Cam Input 2VR/Hall - Software SelectableCam 2 / Wheel Speed
19Analog Ground 1Analog GroundAnalog Ground
20Lambda 1 InputWeak bias to 450mV0-5V Analog Input
21CAN 1H120 Ohm TerminatedTo PC comms DB9
22CAN 1LTo PC comms DB9
23Low Side Output 53A Open Collector MFIOInjector 5 and Lambda 3 Input
24Low Side Output 73A Open Collector w/ recirc diodeMain Relay/PWM1
25Low Side Output 83A Open Collector w/ recirc diodeFuel Pump Relay/PWM2
26Low Side Output 93A Open Collector w/ recirc diodePWM3
27Low Side Output 103A Open Collector w/ recirc diodePWM4
28Low Side Output 113A Open Collector with pull-up to VBATT via diodeTacho Output
29Low Side Output 63A Open Collector MFIOInjector 6 and Lambda 4 Input
30Analog Ground 2Analog GroundAnalog Ground
31NTC Input 33.16K pull-up to VREFNTC1
32Analog Input 247k pull-up to VREFTPS1
33Analog Input 347k pull-up to VREFMAP
34VREF500mA 5V supply to sensors5V Reference
35Power Ground 2Power GroundPower Ground 2

Connector B — AMPSeal 776163-4

PinNameDescriptionNotes
B1H Bridge 1 M+5A H-BridgeThrottle 1 +
B2H Bridge 1 M-5A H-BridgeThrottle 1 -
B3H Bridge 2 M+5A H-BridgeThrottle 2 +
B4H Bridge 2 M-5A H-BridgeThrottle 2 -
B5Bipolar Output 13A Hi Side/Lo Side DrivePWM5
B6Bipolar Output 23A Hi Side/Lo Side DrivePWM6
B7Bipolar Output 33A Hi Side/Lo Side DrivePWM7
B8Bipolar Output 43A Hi Side/Lo Side DrivePWM8
B9Low Side Output 123A Open CollectorInjector 7
B10Low Side Output 133A Open CollectorInjector 8
B11Cam Input 3VR/Hall - Software SelectableCam 3
B12Cam Input 4VR/Hall - Software SelectableCam 4
B13Ignition 5TTL/PowerShort circuit protection for Power
B14Ignition 6TTL/PowerShort circuit protection for Power
B15Ignition 7TTL/PowerShort circuit protection for Power
B16Ignition 8TTL/PowerShort circuit protection for Power
B17Hall Input 1Hall Effect InputWheel Speed LR
B18Hall Input 2Hall Effect InputWheel Speed RR
B19Hall Input 3Hall Effect InputWheel Speed LF
B20Hall Input 4Hall Effect InputWheel Speed RF
B21Knock 1 +
B22Knock 2 +
B23Knock GroundDigital Ground
B24Lambda 2 InputWeak bias to 450mVLambda 2
B25Analog Input 447k pull-up to VREFTPS2
B26Analog Input 547k pull-up to VREFPPS1
B27Analog Input 647k pull-up to VREFPPS2
B28NTC Input 43.16k pull-up to VREFNTC2
B29NTC Input 53.16k pull-up to VREFNTC3
B30Analog Input 747k pull-up to VREFTPS3
B31Analog Input 847k pull-up to VREFTPS4
B32Analog Input 947k pull-up to VREFLinear 7
B33Analog Input 1047k pull-up to VREFLinear 8
B34CAN 2L120 Ohm Terminated
B35CAN 2H

Connector C — AMPSeal 776163-2

PinNameDescriptionNotes
C1Wideband Lambda 1 Heater1.7A Open collector with recirc diode (LSU Pin 3)Wideband Lambda Sensor Heater Output
C2Wideband Lambda IpLSU Pin 1Wideband Lambda Sensor Ip
C3Wideband Lambda IaLSU Pin 5Wideband Lambda Sensor Ia
C4Wideband Lambda Virtual Ground (Vm)LSU Pin 2Wideband Lambda Sensor Vm
C5Wideband Lambda 1 Nernst (Un)LSU Pin 6Wideband Lambda Sensor Un
C6Hall Input 6Cam Sensor 3 Input
C7Hall Input 7Cam Sensor 4 Input
C8LIN
C9L/S Output 140.75A Open collector with recirc diode
C10L/S Output 150.75A Open collector with recirc diode
C11VREF2200mA 5V supply to sensors
C12Analog Ground 2Analog Ground
C13Wideband Lambda 2 Heater1.7A Open collector with recirc diode (LSU Pin 3)Wideband Lambda Sensor Heater Output
C14Wideband Lambda IpLSU Pin 1Wideband Lambda Sensor Ip
C15Wideband Lambda IaLSU Pin 5Wideband Lambda Sensor Ia
C16Wideband Lambda Virtual Ground (Vm)LSU Pin 2Wideband Lambda Sensor Vm
C17Wideband Lambda 2 Nernst (Un)LSU Pin 6Wideband Lambda Sensor Un
C18Analog Input 1147k pull-up to VREF
C19Analog Input 1247k pull-up to VREF
C20Analog Input 1347k pull-up to VREF
C21Low Side Output 161.5A Open collector with recirc diode
C22Low Side Output 171.5A Open collector with recirc diode
C23Low Side Output 181.5A Open collector with recirc diode
C24Low Side Output 191.5A Open collector with recirc diode
C25Low Side Output 201.7A Open collector
C26Low Side Output 211.7A Open collector
C27Low Side Output 22 (Relay Drive)0.75A Open collector with recirc diode
C28Low Side Output 23 (Relay Drive)0.75A Open collector with recirc diode
C29Low Side Output 24 (Relay Drive)0.75A Open collector with recirc diode
C30Low Side Output 25 (Relay Drive)0.75A Open collector with recirc diode
C31Low Side Output 26 (Relay Drive)0.75A Open collector with recirc diode
C32Hall Input 5Hall Effect Input (2k7 Pull-up to 5V)
C33NTC Input 63.16k pull-up to VREF
C34VREF3200mA 5V supply to sensors
C35Analog Ground 3Analog Ground

PC communications connectors

PinNameDescriptionNotes
DB9-1Ground
DB9-6CAN High
DB9-7CAN Low
DB9-8Battery Voltage