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Ignition coil - removal and refitting
Engine electrical systems / Ignition coil - removal and refitting


Warning: Because of the high voltage generated by the ignition system, extreme care should be taken whenever an operation is performed involving ignition components. This not only includes the ignition module/ECU, coil and spark plug (HT) leads, but related components such as electrical connectors, tachometer and other test equipment also.

Check
1 Having checked that full battery voltage is available at the centre terminal of the coilТs electrical connector (see Section 5), disconnect the battery negative (earth) lead - see Section 1.

2 Unplug the coilТs electrical connector, if not already disconnected.

3 Using an ohmmeter, measure the resistance of the coilТs primary windings, connecting the meter between the coilТs terminal pins as follows. Measure first from one outer pin to the centre pin, then from the other outer pin to the centre. Compare your readings with the coil primary resistance listed in the Specifications Section at the beginning of this Chapter.

4 Disconnect the spark plug (HT) leads - note their connections or label them carefully, as described in Chapter 1. Use the meter to check that there is continuity (ie, a resistance corresponding to that of the coil secondary winding) between each pair of (HT) lead terminals; Nos 1 and 4 terminals are connected by their secondary winding, as are Nos 2 and 3. Now switch to the highest resistance scale, and check that there is no continuity between either pair of terminals and the other - ie, there should be infinite resistance between terminals 1 and 2, or 4 and 3 - and between any terminal and earth.

5 If either of the above tests yield resistance values outside the specified amount, or results other than those described, renew the coil. Any further testing should be left to a dealer service department or other qualified repair facility.

Removal and refitting
6 Disconnect the battery negative (earth) lead - see Section 1.

7 Remove the air mass meter and resonator - refer to Chapter 4.

8 Unplug the electrical connector from each side of the coil, then disconnect the spark plug (HT) leads - note their connections or label them carefully, as described in Chapter 1.

9 Undo the two screws securing the EGR pipe to the coil bracket, then remove the coil mounting (Torx-type) screws. Withdraw the coil assembly from the cylinder head (see illustration).

6.9 Unplug coil electrical connector (A), suppressor connector (B), and spark
6.9 Unplug coil electrical connector (A), suppressor connector (B), and spark plug/HT leads (C), remove screws (D), then undo Torx-type screws (E) to release ignition coil assembly

10 The suppressor can be unbolted from the mounting bracket, if required; note that the coil and bracket are only available as a single unit.

11 Refitting is the reverse of the removal procedure. Ensure that the spark plug (HT) leads are correctly reconnected, and tighten the coil screws securely.


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