Peugeot 405 Manual

Fenix system components - removal and refitting
Fuel/exhaust systems - single-point fuel injection models / Fenix system components - removal and refitting


Throttle position sensor 1 Disconnect the battery negative lead, then disconnect the wiring plug from the sensor.

2 Remove the two securing screws, then carefully withdraw the sensor from the fuel injection unit.

3 Refitting is a reversal of removal. No adjustment of the sensor is possible. A selfadjusting system is incorporated in the electronic control unit.

Fuel injector
Note: Refer to the warning note in Section 1 before proceeding. If a faulty injector is suspected, before condemning the injector, it is worth trying the effect of one of the proprietary injector-cleaning treatments.

4 Depressurise the fuel system with reference to Section 8
5 Disconnect the battery negative lead.

6 Unscrew the two securing nuts, and remove the air box from the top of the throttle housing.

7 Release the securing clip and disconnect the injector wiring plug.

8 Remove the screw securing the injector retaining plate to the top of the fuel injection unit, lift off the retainer, then withdraw the injector.

9 Recover and discard the injector sealing rings (check to ensure that new sealing rings can be obtained before discarding the old ones).

10 Refitting is a reversal of removal, bearing in mind the following points.

a) Always renew both sealing rings, and apply a smear of grease to each to ease injector refitting.

b) Refit the injector so that its wiring terminals point towards the front of the vehicle, and locate the edge of the retainer securely in the groove at the top of the injector.

c) Before refitting the injector securing screw, apply a few drops of locking fluid to the threads.

d) On completion, switch on the ignition and check carefully for signs of fuel leaks; if any signs of leakage are detected, the problem must be rectified before the engine is started.

Idle speed control valve 11 Disconnect the battery negative lead, then release the securing clip, and disconnect the wiring plug from the valve.

12 Loosen the clamps, and disconnect the two air hoses from the base of the valve, noting their locations in relation to the flow direction arrow marked on the valve body.

13 Loosen the two clamp nuts or bolts (as applicable), then withdraw the valve (it may be necessary to remove the clamp completely, to provide sufficient clearance to remove the valve).

14 Refitting is a reversal of removal, ensuring that the valve is positioned correctly, with the air hoses connected as noted before removal.

Fuel pressure regulator
15 The fuel pressure regulator (consisting of a valve operated by a spring-loaded diaphragm and a metal cover) is secured by four screws to the top of the throttle housing.

Although the unit can be dismantled for cleaning, if required (once the air box has been removed for access), it should not be disturbed unless absolutely necessary.

16 At the time of writing, it was not clear whether the pressure regulator components were available separately from the complete throttle housing.

17 Always depressurise the fuel system before disturbing any components. If the regulator cover is removed, note its orientation on the throttle housing before removal, to ensure correct refitting.

Inlet air temperature sensor 18 The sensor is screwed into the top of the inlet manifold.

19 Disconnect the battery negative lead.

20 Release the securing clip, and disconnect the wiring plug from the sensor.

21 Unscrew the sensor and withdraw it.

22 Refitting is a reversal of removal.

Manifold absolute pressure (MAP) sensor
23 The sensor is mounted on the body front panel.

24 Disconnect the battery negative lead, then release the securing clip and disconnect the wiring plug from the sensor.

25 Disconnect the vacuum hose from the sensor.

26 Unscrew the two securing nuts, or bolts (as applicable), then withdraw the sensor from the body front panel.

27 Refitting is a reversal of removal.

Coolant temperature sensor 28 Disconnect the electrical plug from the sensor on the water housing.

29 Drain the cooling system as described in Chapter 1.

30 Unscrew the sensor from the water housing.

31 Refit in the reverse order using a new sealing washer, then top-up and bleed the cooling system with reference to Chapter 1.

Engine speed/position sensor 32 Disconnect the wiring lead and release it from the clips.

33 Unscrew the bolt and withdraw the sensor from the engine.

34 Refitting is a reversal of removal. It is not possible to adjust the position of the sensor.


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