Peugeot 405 Manual

Ignition HT coil(s) - removal, testing and refitting
Ignition system / Ignition HT coil(s) - removal, testing and refitting


Removal
Breakerless Electronic ignition system 1 On early models the coil is mounted either on the cylinder block above the starter motor or on the inlet manifold. On later models it is mounted on the left-hand end of the cylinder head. First disconnect the battery negative terminal.

2 Where necessary, disconnect the hot air inlet hose from the exhaust manifold shroud and air temperature control valve and remove it from the engine. Release the inlet duct fastener and position the duct clear of the coil.

3 Disconnect the wiring connector from the capacitor mounted on the coil mounting bracket and where necessary release the TDC sensor wiring connector from the front of the bracket (see illustration).

3.3 On breakerless ignition models, disconnect the capacitor wiring
3.3 On breakerless ignition models, disconnect the capacitor wiring connector, and release the TDC sensor connector . . .

4 Disconnect the HT lead from the coil then depress the retaining clip and disconnect the coil wiring connector (see illustrations).

3.4a . . . then disconnect the HT lead . . .
3.4a . . . then disconnect the HT lead . . .

3.4b . . . and wiring connector (arrowed) from the ignition HT coil
3.4b . . . and wiring connector (arrowed) from the ignition HT coil

5 Slacken and remove the two retaining bolts and remove the coil and mounting bracket.

Where necessary, slacken and remove the four screws and nuts and separate the HT coil and mounting bracket (see illustrations).

3.5a Undo the two retaining bolts (arrowed) . . .
3.5a Undo the two retaining bolts (arrowed) . . .

3.5b . . . and remove the coil and mounting bracket from the cylinder head
3.5b . . . and remove the coil and mounting bracket from the cylinder head

3.5c Coil mounting bolts (arrowed) on Bosch L3.1 system
3.5c Coil mounting bolts (arrowed) on Bosch L3.1 system

3.5d Removing the ignition coil and bracket on the Motronic ignition system
3.5d Removing the ignition coil and bracket on the Motronic ignition system

Integral ignition models 6 Disconnect the battery negative terminal.

The ignition HT coil is mounted on the lefthand end of the cylinder head.

7 Depress the retaining clip and disconnect the wiring connector from the HT coil.

8 Make a note of the correct fitted positions of the HT leads then disconnect them from the coil terminals.

9 Undo the four retaining screws securing the coil to its mounting bracket and remove it from the engine compartment.

Direct ignition models
10 Disconnect the battery negative terminal.

There are four separate ignition HT coils, one on the top of each spark plug.

11 To gain access to the coils, undo the eight bolts, noting the correct fitted position of the wiring clip, and remove the access cover from the centre of the cylinder head cover.

12 To remove an HT coil, depress the retaining clip and disconnect the wiring connector, then pull the coil off the spark plug and remove it along with its rubber seal.

Testing
13 Testing of the coil consists of using a multimeter set to its resistance function, to check the primary (LT У+ТУto У-Ф terminals) and secondary (LT У+Ф to HT lead terminal) windings for continuity, bearing in mind that on the four output, static type HT coil there are two sets of each windings. Compare the results obtained to those given in the Specifications at the start of this Chapter. Note the resistance of the coil windings will vary slightly according to the coil temperature, the results in the Specifications are approximate values for when the coil is at 20∞C.

14 Check that there is no continuity between the HT lead terminal and the coil body/ mounting bracket.

15 If the coil is thought to be faulty, have your findings confirmed by a Peugeot dealer before renewing the coil.

Refitting
16 Refitting is a reversal of the relevant removal procedure, ensuring the wiring connectors are securely reconnected and, where necessary, the HT leads are correctly connected.


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