Chapter 1 Routine maintenance and servicing

1595Ford Fiesta Remake4B•8 Fuel system - central fuel injection engines14.37 Withdrawing the EEC IV enginemanagement module into the passengerfootwellmodule from inside the passengercompartment as its mounting bracketretaining tags are compressed and releasedfrom the engine compartment. Do not allowthe module to drop into the passengercompartment as irreparable damage is likelyto result (see illustration). The module maybe separated from its mounting bracket byundoing the securing bolts.38 Refitting is a reversal of the removalprocedure, ensuring that the modulemounting bracket retaining tags are felt tosnap into positionCrankshaft position sensor39 Refer to Chapter 5B.Coolant temperature sensor40 Refer to Chapter 3.Inlet air temperature sensor41 Remove the air cleaner assembly asdescribed in Section 4.42 Releasing its clip, unplug the sensor’selectrical connector, then unscrew the sensorfrom the CFi unit (see illustration).43 Refitting is the reverse of the removalprocedure. Tighten the sensor to the specifiedtorque wrench setting; if it is overtightened, itstapered thread may crack the resonator.14.42 Disconnecting the intake airtemperature sensor multi-plugThrottle position sensor44 Remove the air cleaner assembly asdescribed in Section 4.45 Releasing its wire clip, unplug thesensor’s wiring connector. Remove theretaining screws, and withdraw the unit fromthe throttle plate control motor bracket (seeillustration). Do not force the sensor’s centreto rotate past its normal operating sweep; theunit will be seriously damaged.46 Refitting is the reverse of the removalprocedure, ensuring that the sensor actuatingarm is correctly located.Vehicle speed sensor47 The sensor is mounted at the base of thespeedometer drive cable, and is removed withthe speedometer drive pinion. Refer to therelevant Section of Chapter 7A or B, asapplicable.Manifold absolute pressuresensor48 The sensor is located near the centre ofthe engine compartment bulkhead.49 Disconnect the wiring multi-plug, anddetach the vacuum hose from the base of thesensor (see illustration).50 Undo the two retaining screws, andwithdraw the sensor from its location.14.45 Throttle position sensor retainingscrews (arrowed) (shown with throttleplate control motor removed)51 Refitting is the reverse of the removalprocedure.Power steering pressure switch52 Releasing its clip, unplug the switch’selectrical connector, then unscrew the switchfrom the power steering high pressure pipe.Place a wad of rag underneath, to catch anyspilt fluid. If a sealing washer is fitted, renew itif it is worn or damaged.53 Refitting is the reverse of the removalprocedure; tighten the switch securely, thentop-up the fluid reservoir (see “WeeklyChecks”) to replace any fluid lost from thesystem, and bleed out any trapped air (seeChapter 10).Oxygen sensorNote: The sensor is delicate, and will not workif it is dropped or knocked, if its power supplyis disrupted, or if any cleaning materials areused on it.54 Release the sensor’s electrical connectorfrom its bracket and unplug it to disconnectthe sensor (see illustration).55 Raise and support the front of the vehicleif required to remove the sensor fromunderneath (“see Jacking and vehiclesupport”). Remove the sensor heat shield thenunscrew the sensor from the exhaust systemfront downpipe; collect the sealing washer(where fitted).56 On refitting, clean the sealing washer(where fitted) and renew it if it is damaged or14.49 Manifold absolute pressure sensor locationA Securing screws B Multi-plug C Vacuum hoseArrows indicate ignition module retaining screws14.54 Oxygen sensor (A) (shown with itsheatshield removed), and its multi-plug (B)