Chapter 4 Part B: Fuel/exhaust systems - single-point fuel injection ...

Fuel/exhaust systems - single-point fuel injection models 4B•715.3a Undo the injector cap screw, notingthe use of rag to catch fuel spray . . .15.3b . . . then lift off the cap and withdrawthe injector15.3c On refitting, ensure cap terminalsare aligned with injector pins (arrowed)15 Bosch Monopoint systemcomponents - removal andrefitting3Note: Check the availability of individualcomponents with your Peugeot dealer beforedismantling.Fuel injectorNote: Refer to the warning note in Section 1before proceeding. If a faulty injector issuspected, before condemning the injector, itis worth trying the effect of one of theproprietary injector-cleaning treatments.1 Remove the inlet air temperature sensor asdescribed later in this Section.2 Lift out the injector and recover its lowersealing ring.3 Refitting is a reversal of the removalprocedure ensuring that the injector sealingring(s) and injector cap O-ring are in goodcondition. When refitting the injector capensure that the injector pins are aligned withthe cap terminals, the terminals are marked “+”and “-” for identification (see illustrations).8 Refitting is a reverse of the removalprocedure, ensuring that the diaphragm andcover are fitted the correct way round, andthat the retaining screws are securelytightened.Idle control stepper motor9 Disconnect the battery negative terminal.10 Depress the retaining clip and disconnectthe wiring connector from the idle controlstepper motor.11 Undo the retaining screws and removethe motor from the front of the throttle body(see illustration).12 Refitting is a reverse of the removalprocedure, ensuring that the motor retainingscrews are securely tightened.Throttle potentiometer13 The throttle potentiometer is a sealed unit,and under no circumstances should it bedisturbed. For this reason, on some models, itis secured to the throttle body assembly bytamperproof screws. If the throttlepotentiometer is faulty, the complete throttlebody assembly must be renewed - refer toyour Peugeot dealer for the latest information.Inlet air temperature sensorNote: Refer to the warning note in Section 1before proceeding.14 The inlet air temperature sensor is anintegral part of the throttle body injector cap.To remove the cap, first disconnect thebattery negative terminal, then remove the aircleaner-to-throttle body duct using theinformation given in Section 2.15 Undo the three retaining screws andremove the circular plastic ring from the top ofthe throttle body and recover its sealing ring(see illustrations).16 Depress the retaining clip and disconnect4BFuel pressure regulatorNote: Refer to the warning note in Section 1before proceeding. At the time of writing, thefuel pressure regulator assembly was notavailable separately from the throttle bodyassembly. Refer to a Peugeot dealer for thelatest information. Although the unit can bedismantled for cleaning, if required, it shouldnot be disturbed unless absolutely necessary.4 Disconnect the battery negative terminal.5 Remove the air cleaner-to-throttle bodyduct, using the information given in Section 2.6 Using a marker pen, make alignment marksbetween the regulator cover and throttlebody, then slacken and remove the coverscrews (see illustration). As the screws areslackened, place a clean rag over the cover tocatch any fuel spray which may be released.7 Lift off the cover, then remove the springand withdraw the diaphragm, noting itscorrect fitted orientation. Remove all traces ofdirt and examine the diaphragm for signs ofsplitting. If damage is found, it will probablybe necessary to renew the throttle bodyassembly.15.6 Fuel pressure regulatorretaining screws (arrowed)15.15a Undo the three retaining screws(arrowed) . . .15.11 Idle control stepper motorretaining screws (arrowed)15.15b . . . then lift off the plastic ring andrecover the sealing ring