Peugeot 405 Manual

Bosch LU2-Jetronic system components - removal, refitting and adjustments
Fuel/exhaust systems - multi-point fuel injection models / Bosch LU2-Jetronic system components - removal, refitting and adjustments


Throttle initial position 1 The throttle initial position is set in production, and will not normally require adjustment unless the throttle housing has been tampered with. Adjustment should be entrusted to a Peugeot dealer.

Throttle switch unit
2 Disconnect the battery negative lead.

3 Disconnect the wiring plug from the switch.

4 Remove the two securing screws, and withdraw the switch from the throttle body.

5 Commence refitting by initially adjusting the switch as described later.

6 Refitting is reversal of removal, but ensure that the switch wiper engages correctly with the flats on the end of the throttle spindle.

7 The throttle initial position must be correctly adjusted before attempting to adjust the throttle switch.

8 Slacken the throttle switch securing screws.

9 Turn the switch unit fully clockwise, then turn it slowly back until the idling contacts are heard to close.

10 Tighten the securing screws.

11 Pull the wiring from the switch, then connect an ohmmeter between terminals 2 and 18 in the switch - the ohmmeter should read zero.

12 Operate the throttle linkage, and the ohmmeter should read infinity.

13 If the readings are not correct, repeat the adjustment.

14 Connect an ohmmeter between switch terminals 3 and 18 - the ohmmeter should read infinity.

15 Fully open the throttle, and the ohmmeter should read zero.

16 If the specified readings cannot be obtained, renew the switch.

17 Reconnect the switch wiring plug on completion.

Airflow meter
18 The airflow meter is removed as described in Section 2.

Electronic control unit (ECU) 19 Refer to Section 13.

Fuel injectors
Note: Refer to the warning note in Section 1 before proceeding.

Note: If a faulty injector is suspected, before condemning the injector, it is worth trying the effect of one of the proprietary injectorcleaning treatments.

20 Depressurise the fuel system.

21 Disconnect the battery negative lead.

22 Disconnect the wiring plugs from the fuel injectors, labelling them if necessary to ensure correct refitting.

23 Disconnect the vacuum hose from the top of the fuel pressure regulator.

24 Unscrew the four bolts securing the fuel rail to the inlet manifold then carefully lift the rail, complete with pressure regulator and fuel injectors, from the inlet manifold, taking care not to strain any of the hoses or pipes.

25 To remove a fuel injector from the fuel rail, carefully remove the metal securing clip, then pull the injector from the rail. Be prepared for fuel spillage.

26 Refitting is a reversal of removal, but use new injector O-rings.

Fuel pressure regulator
Note: Refer to the warning note in Section 1 before proceeding.

27 For improved access to the regulator lower securing nut, remove the fuel rail.

28 If not already done, disconnect the vacuum hose from the top of the pressure regulator.

29 Slacken the hose clip, and disconnect the fuel return hose from the bottom of the pressure regulator. Be prepared for fuel spillage.

30 Unscrew the two bolts securing the pressure regulator to the fuel rail bracket assembly, whilst counterholding the nuts.

Note that on some models a hose bracket is secured by the upper bolt.

31 Pull the regulator from the end of the fuel rail, and recover the O-ring.

32 Refitting is a reversal of removal, but use a new O-ring when refitting the pressure regulator to the fuel rail, and where applicable, use new injector O-rings.

Oxygen sensor
33 The sensor is located in the exhaust downpipe. When handling the sensor, note that it is fragile; take care not to drop it, and do not allow it to contact fuel or silicone substances.

34 Start the engine and run it until it reaches normal operating temperature, then switch off and disconnect the battery negative lead.

35 If access is required from below, jack up the front of the car and support it on axle stands (see “Jacking and Vehicle Support).

36 Release the securing clips, and separate the two halves of the sensor wiring connector.

37 Using a suitable spanner, unscrew it from the exhaust downpipe.

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

a) Apply anti-seize compound to the threads of the sensor.

b) The sensor must be tightened securely; this will require the use of either a deep socket, slotted to allow for the sensor wiring, or of a spanner.


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