Following two are for Fiesta mk3 - 1600 CVH (RS Turbo / 2i), and the 1800 Zetec (2i / RS1800) Pin Colour Function (RST & 8v 2i CVH) Colour Function (16v 2i Zetec) 1 R (permanent) Fused +12VE in Same 2 3 Bn/Y Octane/Idle adjust Bn/W VSS (signal) 4 Bn/W VSS (signal) Bn/Y EDIS pin 2 (IDM diagnostic) 5 6 7 Bn/Gn CTS (signal) Same 8 Bn COpot (signal) (or 27 ofab?) 9 Bn/R MAF 10 11 Bn/W Canister purge valve 12 13 14 Bn/Y GND switched Pulse air solenoid 15 16 Bn GND in (tied to pin 40) EDIS pin 4 (IGN GND return) 17 Bn/Gn Diagnostic Connector Same 18 B/Y SBDS Connector (?) 19 B/Gn SBDS Connector (?) 20 Bn GND (also shield for 36 & 56) Same 21 Bn/Y switched GND ISCV Same 22 Bn switched GND fuel pump relay Same 23 Bn/R Octane/Idle adjust 24 Bn/B Octane/Idle adjust B/R Cam Phase (signal) 25 Bn/Y ATS Same 26 Bn/Bk +5 MAP/TPS/COpot Bn/Bk +5 TPS 27 Bn COpot (signal ofab?) (or 8) 28 B/Y [2i only] EDIS pin 2 (IDM diag) Bn Octane Adjust 29 30 31 32 33 Bn/Gn [RST only] switched GND AMAL 34 35 Bn/Y INJ 36 B/R (shield to pin 20) EDIS pin 3 (SAW) Same 37 Bk (switched) +12V in Same 38 39 Bn/Gn INJ 40 Bn GND in (tied to pin 16) Bn GND in (+MAF/HEGO/VSS) 41 42 Bn/R Octane Adjust 43 44 B/W HEGO 45 Bn/Y MAP (signal) 46 Bn GND MAP/CTS/TPS/ATC/COpot Same(+HEGO/CamPhase) 47 Bn/Gn TPS (signal) Same 48 B/Gn Diagnostic Connector Same 49 50 Bn/R MAF 51 52 53 54 55 56 B/Y (shield to pin 20) EDIS pin 1 (PIP) Same 57 Bk (switched) +12V in Same 58 Bn switched GND INJa Bn/Bk INJ 59 Bn switched GND INJb Bn/R INJ 60 Bn GND in Same notes: pin 37,57 switched by relay 3 - ignition live also ign live fed to: EDIS pin 8, INJa&b, VSS, ISCV, AMAL, fuel pump relay And for 4.1l 6cyl Falcon (from fordmods.com originally) There are 2 distinct model ECU's that were available for the XF EFI models. Later XF models were shipped with Unleaded ECU's and motors, to comply with the ADR37. Unleaded and Leaded ECU's Are NOT INTERCHANGEABLE. Along with these 2 model ECU's there were also some pin out changes made, with some features added, and deleted, depending on the model. These changes include: Knock Sensor was added on pin 23(Unleaded) EGR Control Solenoid was moved from Pin 54(Leaded) to Pin 33(Unleaded) EGR Vent Solenoid was moved from Pin 35(Leaded) to pin 52(Unleaded) Canister Purge Solenoid was moved from Pin 32(Leaded) to Pin 35(Unleaded) Vane Air Flow Meter Output was moved from Pin 43(Leaded) to Pin 27(Unleaded) Pin No Wire Colour Purpose Voltage 1 2 3 4 5 6 7 Engine Coolant Temp 20*C-3.1V, 40*C-2.2V, 100*C-0.5V 8 9 10 Air conditioning Clutch On 0V Aircon Off, 12V Air con On 11 12 13 14 15 16 Ground 0V 17 Self Test Output (STO) PWM signal 0V-12V 18 19 20 Case Ground 0V 21 Idle Speed Control +8V to +11V Engine Running 22 Fuel Pump Control +12V Ignition On 23 Knock Sensor (Unleaded Only) +3V Engine Running 24 25 Intake Air Temperature Sensor 0*C 3.9V, 20*C 3,1V, 40*C 2.2V 26 Sensor Reference Voltage +5V 27 Air Flow Sensor (Unleaded Only) Variable Voltage 28 29 30 Transmission Position Neutral 0V-0.1V, In gear 5Volts 31 Canister Purge 8V-10V with Engine Running 32 33 EGR Solenoid (Unleaded) Voltage Pulse @ 1800 RPM 34 Data Output Link PWM Data 35 Canister Purge solenoid (Unleaded) Voltage Pulse when Engine Running 35 EGR Vent Solenoid (leaded) Voltage Pulse when Engine Running @ 1800RPM 36 SPOUT (Spark Output) Ignition 7V average with Engine Running 37 Ignition Power 12V with Ignition On 38 39 40 Ground 0Volts 41 42 43 Air Flow Sensor (Leaded Only) Variable Voltage 44 45 46 Signal Ground 0Volts 47 Throttle Position Sensor 0.7V closed, 4.5V WOT (Wide Open) 48 Self Test Input 0Volts for Self Test, 12V Normal operation 49 50 51 52 EGR Vent Solenoid (Unleaded) Voltage Pulse @ 1800 RPM 53 54 EGR Vent Solenoid (leaded) Voltage Pulse @ 1800 RPM 55 56 PIP Profile Ignition Pick Up 0V - 12V on Ignition PIP 57 Ignition Power 0Volts Off, 12V Ignition On 58 Fuel Inj Ignition Bank 1,3,5 PWM On Fuel Injection 59 Fuel Inj Ignition Bank 2,4,6 0Volts Off, 12V On 60