?

im not sure what your getting at
but the wire from the ecu is a negative trigger to the relay.. as i have this wire connected to an earth to run the pump constantly when ignition is on, as i have bypassed the ecu fuel pump control..

Can ya just switch the ECU's earth man??

FORD FALCON EL 4.0L (H and X Engines) 1996-97 Engine Management System
FORD FAIRLANE NL 4.0L (H and X Engines) 1996-97 Engine Management System
FORD LTD DL 4.0L (H and X Engines) 1996-97 Engine Management System
(Includes Factory LPG Systems)

PCM Voltage Table


Pin # Circuit and Status........................................... Voltage

1 Keep Alive Power
All Times.......................................................... Battery Volts

3 Vehicle Speed Sensor (Use Scope to test)
Vehicle Moving................................................. 0 to 10 Volts Square Wave

4 Engine Immobilisation (Smart Lock)
All Times.......................................................... 0 to 12 Volts Signal

5 Key Power
Ignition ON....................................................... 12 Volts
Engine Running................................................ 12 to 14.5 Volts

7 Engine Coolant Temperature Sensor
Ignition ON
Engine Coolant @ 20°C..................................... 3.1 Volts
Engine Coolant @ 40°C..................................... 2.2 Volts
Engine Coolant @ 100°C................................... 0.5 Volts

8 Fuel Select (Factory LPG)
Ignition ON
Petrol Mode selected........................................ >9.0 Volts
LPG Mode selected.......................................... 0 Volts

10 A/C Clutch
Engine Running
A/C ON............................................................ <1.0 Volts
A/C OFF.......................................................... Battery Volts

11 Lock Up Solenoid (Solenoid #7)
Solenoid Energised........................................... Low Volts
Solenoid Not Energised..................................... Battery Volts

12 Economy Indicator Lamp
Ignition ON
Normal Selected............................................... >10 Volts
Economy Selected............................................ 0 Volts

13 Liquid Petroleum Gas (LPG) Cut Off Solenoid
Ignition ON
LPG ON........................................................... 0 Volts
LPG OFF......................................................... 12 Volts

14 Line Pressure Control Solenoid (Solenoid #6)
Solenoid Energised........................................... Low Volts
Solenoid Not Energised..................................... Battery Volts

15 Broadband Manifold
Ignition ON....................................................... 12 Volts
Engine Running < 3800 RPM............................. 0 Volts
Engine Running > 3800 RPM............................. Battery Volts

16 Ignition Ground
All Times.......................................................... 0 Volts

17 Self Test Output
Ignition ON....................................................... Battery Volts
Engine Running................................................ Battery Volts

20 Case Ground
All Times.......................................................... 0 Volts

21 Idle Speed Control (Use Scope to test)
Ignition ON....................................................... 12 Volts
Engine Running................................................ 8 to 11 Volts

22 Fuel Pump Control
Ignition ON....................................................... 12 Volts
Engine Running................................................ >1 Volts

23 Knock Sensor
Ignition ON....................................................... 3 Volts
Engine Running................................................ 3 Volts

25 Intake Air Temperature Sensor
Ignition ON
Intake Air Temperature @ 0° C............................ 3.9 Volts
Intake Air Temperature @ 20°C.......................... 3.1 Volts
Intake Air Temperature @ 40°C.......................... 2.2 Volts

26 Voltage Reference
Ignition ON....................................................... 5 Volts
Engine Running................................................ 5 Volts

27 Pattern Select (Normal/Economy)
Ignition ON
Normal Mode.................................................... 9 to 12 Volts
Economy Mode................................................ 0 Volts

28 Power Steering Pressure Switch
Ignition ON
Engine Running................................................ 0 Volts
No Power Steering Load.................................... 0 Volts
With Power Steering Load................................. 12 Volts

29 Oxygen Sensor Signal
Engine @ Operating Temperature
Ignition ON....................................................... 0 Volts
Engine Running................................................ 0.1 to 0.8 Volts Switching

30 Transmission Range/Neutral Drive Switch (Automatic Transmission)
Ignition ON....................................................... 3.8 to 4.2 Volts
Park................................................................ 3.3 to 3.7 Volts
Reverse............................................................ 2.8 to 3.2 Volts
Neutral............................................................. 2.3 to 2.7 Volts
Drive................................................................ 1.8 to 2.2 Volts
3..................................................................... 1.3 to 1.7 Volts
2..................................................................... 0.8 to 1.2 Volts

30 Transmission Neutral Switch (Manual Transmission)
Ignition ON
Neutral............................................................. 0 to 0.1 Volts
In-Gear............................................................. 5 Volts

31 Canister Purge Solenoid
Ignition ON....................................................... 12 Volts
Engine Running................................................ 8 to 10 Volts

32 Gas Shut Off (Factory LPG)
Ignition ON
LPG OFF......................................................... 12 Volts
LPG ON........................................................... 0 Volts

33 Engine Cooling Fan #2
Ignition ON
Engine Running................................................ 12 Volts
Relay 2 & 3 OFF............................................... 12 to 14.5 Volts
Relay 2 & 3 ON................................................ 0 Volts

34 Data Output Link (Use Scanner)
Ignition ON....................................................... 0 to 12 Volts Pulse Wave

35 Multiplex Control Solenoid (Solenoid #3)
Solenoid Energised........................................... Low Volts
Solenoid Not Energised..................................... Battery Volts

36 Spark Out (Use Scope to test)
Ignition ON....................................................... 12 Volts
Engine Running................................................ 6 to 7 Volts Average

37 Vehicle Power
Ignition ON....................................................... Battery Volts

38 Variable Pressure Solenoid (Solenoid #5) (Duty Cycle used)
Solenoid Energised........................................... Low Volts
Solenoid Not Energised..................................... Battery Volts
PID read in mA................................................. 0.2 to 1.275 Amps

39 Speed Sensitive Power Steering (Use Scope to test)
Ignition ON....................................................... 12 Volts
Engine Running................................................ 0 to 12 Volts Pulse Wave

40 Power Ground
All Times.......................................................... 0 Volts

41 Air Conditioner Compressor
Ignition ON
Engine Running................................................ 0 Volts
A/C Clutch Engaged.......................................... 12 to 14.5 Volts
A/C OFF.......................................................... 0 Volts

42 Transmission Oil Temperature
Ignition ON @ 20°C........................................... 3.6 Volts
Engine Running @ Normal Operating Temp......... 1.0 to 3.6 Volts

43 A/C Evaporative Air Temperature
Ignition ON
Temperature @ 20°C......................................... 1.5 to 2.0 Volts

44 Blower Fan Speed
Ignition ON
Fan Switch @ Position 1................................... 3.6 Volts Approx.
Fan Switch @ Position 2................................... 5.6 Volts Approx.
Fan Switch @ Position 3................................... 7.9 Volts Approx.
Fan Switch @ Position 4................................... Battery Volts
Climate Control................................................. Varies with Fan Speed

45 Manifold Absolute Pressure Sensor
Ignition ON....................................................... 155 to 160 Hz
Engine Running................................................ 100 to 105 Hz

46 Signal Return
All Times.......................................................... 0 Volts

47 Throttle Position Sensor
Ignition ON
Closed Throttle................................................. 0.55 to 0.85 Volts
Wide Open Throttle........................................... 4.0 to 4.5 Volts

48 Self Test Input
Ignition ON....................................................... 12 Volts

49 Oxygen Sensor Ground
All Times.......................................................... 0 Volts

51 Gear Select Solenoid 1
Solenoid Energised........................................... Low Volts
Solenoid Not Energised..................................... Battery Volts

52 Gear Select Solenoid 2
Solenoid Energised........................................... Low Volts
Solenoid Not Energised..................................... Battery Volts

53 Engine Cooling Fan #1
Ignition ON
Engine Running................................................ Battery Volts
Relay 1 OFF..................................................... Battery Volts
Relay 1 ON...................................................... 0 Volts

54 Air Conditioner (WAC) Relay
Ignition ON, A/C OFF
Engine Running................................................ Battery Volts
A/C OFF.......................................................... Battery Volts
A/C ON............................................................ 0 Volts

55 Multiplex Control Solenoid 2 (Solenoid #4)
Solenoid Energised........................................... Low Volts
Solenoid Not Energised..................................... Battery Volts

56 Profile Ignition Pick Up (Use Scope to test)
Ignition ON....................................................... 0 to 12 Volts
Engine Running................................................ 6 Volts Average.

57 Vehicle Power
Ignition ON....................................................... Battery Volts
Engine Running................................................ Battery Volts

58 Injector #1, 3 and 5 (Use Scope to test)
Ignition ON....................................................... Battery Volts
Engine Running................................................ Voltage Pulse

59 Injector #2, 4 and 6 (Use Scope to test)
Ignition ON....................................................... Battery Volts
Engine Running................................................ Voltage Pulse

60 Power Ground
All Times.......................................................... 0 Volts



I hope this clears some information for ya all

Just on the subject, my XH previously had a wire going from the neg wire on the coil to a switch under the dash, what would this do?? Kill switch?? Its now disconnected but was just curious.