Peugeot 405 Manual

Emission control systems - testing and component renewal
Emission control systems / Emission control systems - testing and component renewal


Crankcase emission control 1 The components of this system require no routine attention, other than to check that the hoses are clear and undamaged at regular intervals.

Evaporative emission control Testing
2 If the system is thought to be faulty, disconnect the hoses from the charcoal canister and purge control valve, and check that they are clear by blowing through them. If the purge control valve or charcoal canister are thought to be faulty, they must be renewed.

Charcoal canister - renewal 3 Jack up the front of the car and support on axle stands (see Jacking and Vehicle Support). Remove the left-hand front wheel.

4 Remove the left-hand front wheel arch liner with reference to Chapter 11.

5 Disconnect the hoses from the canister, noting their locations to ensure correct refitting.

6 Unscrew the clamp bolt, and lift the canister from its clamp on the body panel.

Alternatively, the complete clamp bracket/canister assembly can be removed if desired. Store or dispose of the canister carefully - it may contain fuel vapour.

7 Refitting is a reversal of removal, but ensure that the hoses are correctly reconnected as noted before removal.

Purge valve(solenoid valve) - renewal 8 The purge valve is located in the hose running from the carbon canister to the throttle body/inlet manifold. The valve may be mounted on a bracket, or may simply be attached to the hoses, depending on model.

9 To remove the valve, first disconnect the battery negative lead.

10 Where applicable, unbolt the valve bracket, then disconnect the wiring plug.

11 Disconnect the hoses from the valve, noting their locations to ensure correct refitting, then withdraw the valve.

12 Refitting is a reversal of removal, ensuring that the hoses are correctly reconnected, as noted before removal.

Exhaust emission control Testing
13 The performance of the catalytic converter can be checked only by measuring the idle mixture setting (exhaust gas CO content) using an accurately calibrated exhaust gas analyser.

14 If the CO level at the tailpipe is too high, the vehicle should be taken to a Peugeot dealer so that the complete fuel injection and ignition systems, including the lambda sensor, can be thoroughly checked using the special diagnostic equipment.

15 Once this has been done, any fault must lie in the catalytic converter, which should be renewed as described below.

Catalytic converter - renewal 16 Refer to Part A of this Chapter, for the centre silencer.

Lambda sensor - renewal
Note: The lambda sensor is fragile, and will not work if it is dropped or knocked, if its power supply is disrupted, or if any cleaning materials are used on it.

17 According to model the Lambda sensor is located either in the exhaust downpipe or in the exhaust centre section.

18 Where necessary, jack up the front of the car and support on axle stands (see Jacking and Vehicle Support).

19 Trace the wiring back from the lambda sensor to the connector and disconnect it.

20 Unscrew the sensor and remove it along with its sealing washer.

21 Refitting is a reversal of the removal procedure, using a new sealing washer.

Ensure that the sensor is securely tightened.

Check that the wiring is correctly routed, and in no danger of contacting either the exhaust system or the engine.


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