Ford Sierra Manual

Electronic modules - removal and refitting
Engine electrical systems / Electronic modules - removal and refitting


Note: Refer to Section 1 for precautions to be observed when working with electronic modules.

1 Disconnect the battery negative lead.

All ESC modules except ESC (early УEconomyФ models) 2 All modules except the ESC Hybrid module are mounted on the left-hand side of the engine compartment (see illustration). The ESC Hybrid module is mounted on the right-hand side of the engine compartment.

18.2 ESC module securing screws (arrowed)
18.2 ESC module securing screws (arrowed)

A Wiring plug B Vacuum pipe

3 Disconnect the module wiring plug by pulling on the plug, not the wiring. On ESC II modules, except those fitted to 1.8 litre models from February 1987, a locking tab at the lower end of the wiring plug must be depressed before unhooking the upper end of the plug from the module. On ESC II modules fitted to 1.8 litre models from February 1987 (see illustration) and ESC Hybrid modules, the wiring plug is secured by a screw which is integral with the plug (see illustrations).

18.3a ESC II module - 1.8 litre models from February 1987
18.3a ESC II module - 1.8 litre models from February 1987

18.3b Disconnecting ESC II module wiring plug
18.3b Disconnecting ESC II module wiring plug

18.3c Disconnecting ESC Hybrid module wiring plug
18.3c Disconnecting ESC Hybrid module wiring plug

4 Where applicable, disconnect the vacuum pipe from the module (see illustration).

18.4 Disconnecting ESC II module vacuum pipe
18.4 Disconnecting ESC II module vacuum pipe

5 Remove the two or three securing screws, as applicable, and withdraw the module from the engine compartment. Note that the top securing screw of the ESC module also secures the ignition coil strap.

6 Refitting is a reversal of removal, but ensure that the underside of the module and the corresponding area of the body panel are clean.

ESC module (early УEconomyФ models)
7 Remove the module complete with its securing bracket, as described above.

8 Fit the new module, slightly behind the old module position, on the flat vertical surface of the body panel, and secure with the two screws supplied. Note that the module must be mounted against the flat area of the body panel to prevent distortion of the module, and to ensure good heat transfer from the module to the body.

9 Reconnect the module vacuum pipe.

10 Connect the adapter loom supplied with the new module between the module and the old moduleТs wiring plug.

11 Where applicable, refit the coil to its original location.

EEC IV modules
Ignition module
Models up to 1987
Note: When refitting, the rear face of the module must be coated with heat sink compound. Refer to a Ford dealer for advice if necessary.

12 The module is mounted on the distributor body.

13 Disconnect the distributor wiring plug by depressing the locking tabs. Pull on the plug, not the wiring.

14 Remove the two securing screws from the module, then slide the module downwards and withdraw it (see illustration).

18.14 EEC IV ignition module securing screws (arrowed) - models up to 1987
18.14 EEC IV ignition module securing screws (arrowed) - models up to 1987

15 Refitting is a reversal of removal, but the rear face of the module must be coated with heat sink compound. Do not force the module into position, as damage to the electrical contacts may result.

Models from 1987
16 The module is mounted on the left-hand side of the engine compartment (see illustration).

18.16 EEC IV ignition module - models from 1987
18.16 EEC IV ignition module - models from 1987

17 Disconnect the module wiring plug by depressing the locking tabs. Pull on the plug, not the wiring.

18 Remove the two securing screws and withdraw the module from the engine compartment.

19 Refitting is a reversal of removal, but ensure that the underside of the module and the corresponding area of the body panel are clean.

1.6 and 1.8 litre (R6A type) CVH models 20 The ignition module is located at the front right-hand side of the engine compartment.

21 Disconnect the battery negative lead.

22 Release the securing lug, and pull the wiring plug from the module. Pull on the plug, not on the wiring (see illustration).

18.22 Disconnecting the ignition module wiring plug
18.22 Disconnecting the ignition module wiring plug

23 Remove the two securing screws, and withdraw the module from the body panel.

24 Refitting is a reversal of removal.

2.0 litre DOHC fuel injection models 25 The ignition module is located on the lefthand side of the engine compartment, beneath the coil (see illustration).

18.25 Ignition module location (arrowed)
18.25 Ignition module location (arrowed)

26 Disconnect the battery negative lead.

27 Remove the two securing screws, and withdraw the coil/ignition module heat shield.

28 Release the locking lug and disconnect the ignition module wiring plug. Pull on the plug, not on the wiring.

29 Remove the two securing screws, and withdraw the module from the body panel.

30 Refitting is a reversal of removal, ensuring that the underside of the module and the corresponding area of the body panel are clean.

Engine management module All models except 1.6 and 1.8 litre CVH (R6A type) and 2.0 litre DOHC fuel injection 31 The module is located inside the passenger compartment behind the passenger side facia.

32 Unclip the trim panel from below the glovebox on models up to 1987, or from above the glovebox on models from 1987.

33 Unclip the module retainer and withdraw the module.

34 The wiring plug is secured by a screw which is integral with the plug. Disconnect the wiring plug and remove the module.

35 Refitting is a reversal of removal, noting that the wiring plug will only fit in one position.

1.6 and 1.8 litre (R6A type) CVH models 36 The module is located in the passenger compartment, behind the glovebox.

37 Disconnect the battery negative lead.

38 Open the glovebox, and carefully pull it from its retaining clips.

39 Unclip and withdraw the module from its retaining bracket (see illustration).

18.39 Engine management module withdrawn from its mounting bracket
18.39 Engine management module withdrawn from its mounting bracket

40 The wiring plug is secured by a screw which is integral with the plug. Disconnect the wiring plug, and withdraw the module.

41 Refitting is a reversal of removal, noting that the wiring plug will only fit in one position.

2.0 litre DOHC fuel injection models 42 For models up to 1990 refer to the first 5 paragraphs of this sub Section.

43 For models from 1990 refer to the procedure given for 1.6 and 1.8 litre CVH (R6A type) engines.


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