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1 Telephone: Fax: VAT Registration No.: Name: Manufacturer: Ford Address: Model: Scorpio Year: 1991 Registration: Tel - Private: Tel - Business: Mileage: Job number: Terminal side Wire side Component/circuit description ECM pin Signal Condition Typical value Oscilloscope setting (Suggested settings - Voltage/time per division) Wave form AC compressor clutch relay 54 Engine idling - AC ON AC compressor clutch relay 54 Engine idling - AC ON - accelerator pedal briefly fully depressed 0-1 V briefly Air conditioning 10 Engine idling - AC OFF Air conditioning 10 Engine idling - AC ON - AC compressor ON Battery 1 Ignition OFF Brake pedal position (BPP) switch Ignition ON - brake pedal released

2 Brake pedal position (BPP) switch 18 Ignition ON - brake pedal depressed Crankshaft position (CKP) - without integral amplifier/distributor Crankshaft position (CKP) 56 Engine idling 45 Hz 56 Engine idling 5 V/20 ms Data link connector (DLC) 17 Data link connector (DLC) 48 Digital multifunction display Earth 20 Ignition ON Earth 40 Ignition ON Earth 49 Ignition ON Earth 60 Ignition ON Earth - brown wire 28 Ignition ON Earth - some models 5 Ignition ON Earth - without integral amplifier/distributor 16 Ignition ON Engine control relay 37 Ignition OFF Engine control relay 37 Ignition ON Engine control relay 57 Ignition OFF Engine control relay 57 Ignition ON Engine control relay Ignition ON 0-1 V briefly then V Engine control relay 22 Engine cranking 0-1 V (ECT) 7 Ignition ON - coolant temp. 0 C 3,8-3,9 V (ECT) 7 Ignition ON - coolant temp. 20 C 3-3,2 V (ECT) 7 Ignition ON - coolant temp. 80 C 0,6-0,9 V (ECT) (ECT) Ignition ON 49 Ignition ON Evaporative emission (EVAP) 31 - valve not Evaporative emission (EVAP) 31 Engine under load - engine - valve 3-14 V Evaporative emission (EVAP) 31 Ignition ON

3 Evaporative emission (EVAP) 31 Engine running - valve 1/50 ms (EGR) backpressure transducer - if fitted 26 Ignition ON 5 V (EGR) backpressure transducer 27 Ignition ON 0,4-3,9 V - varies with pressure (EGR) backpressure transducer 46 Ignition ON (EGR) solenoid - if fitted (EGR) solenoid 33 Accelerate briefly - engine 9-14 V (EGR) solenoid 33 Ignition ON (EGR) solenoid 33 Engine running - valve 5 V/20 ms Fuel flow Fuel pump relay Ignition ON 0-1 V briefly then V Fuel pump relay 22 Engine cranking 0-1 V Heated oxygen (HO2S) ,1-0,9 V fluctuating 0,2 V/1 sec. Heated oxygen (HO2S) - LH ,1-0,9 V 0,2 V/1 sec. Heated oxygen (HO2S) - RH ,1-0,9 V 0,2 V/1 sec. Heated oxygen s (HO2S) - 4-wire 46 Heated oxygen s (HO2S) 49 Idle adjustment connection - blue/yellow wire 28 Ignition ON or 5 V Idle air control (IAC) valve 21 9,5-11 V 2 V/5 ms Ignition amplifier 36 Engine idling 45 Hz 2 V/10 ms Ignition amplifier - with integral amplifier/distributor 16 Ignition ON Ignition amplifier 56 Engine idling 45 Hz 5 V/20 ms Injectors - group A 58 Ignition ON Injectors 58 Engine idling 2,3 ms 1/2 ms Injectors - group B 59 Ignition ON Injectors 59 Engine idling 2,3 ms 1/2 ms

4 25 Ignition ON - air temp. 0 C 3,8-3,9 V 25 Ignition ON - air temp. 20 C 3-3,2 V 25 Ignition ON - air temp. 40 C 2-2,2 V Ignition ON 49 Ignition ON 26 Ignition ON 5 V 45 Ignition ON 170 Hz 45 cold 120 Hz Hz rpm 105 Hz 46 Ignition ON 49 Ignition ON Octane coding plug - if fitted 23 Ignition ON or 5 V Octane coding plug 24 Ignition ON or 5 V switch Ignition start position - AT not in P or N switch Ignition start position - AT in P or N - engine cranking 0-1 V switch Ignition ON - AT not in P or N switch Ignition ON - AT in P or N 0-1 V Pulsed secondary air injection (PAIR) solenoid - some models cold 9-14 V Pulsed secondary air injection (PAIR) solenoid 51 Pulsed secondary air injection (PAIR) solenoid 51 Ignition ON Throttle position (TP) 26 Ignition ON 5 V Throttle position (TP) 46 Ignition ON Throttle position (TP) 47 Throttle position (TP) 47 Ignition ON - throttle closed Ignition ON - throttle fully open 0,5-0,9 V 4,3-5 V Throttle position (TP) Ignition ON

5 Transmission kick-down relay/switch Ignition ON - accelerator pedal released Transmission kick-down relay/switch 19 Ignition ON - accelerator pedal fully depressed Transmission modulator 53 Ignition ON 9-12 V Transmission modulator Ignition ON 9-12 V Vehicle speed (VSS) 3 Ignition ON - vehicle pushed or Vehicle speed (VSS) 3 Vehicle moving 5 V/50 ms 4. Digital, DC, frequency modulated 20. Digital, DC, pulse width modulated or digital, DC, frequency modulated 21. Analogue, DC 29. Digital, DC, pulse width modulated or digital, DC, frequency modulated 32. Digital, DC, frequency modulated 35. Digital, DC, pulse width modulated

6 43. Digital, DC, frequency modulated

Telephone: Fax: VAT Registration No.:

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