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5•10 Engine electrical systems
18.15 Removing the engine management
modules (glovebox removed for clarity)
16 Undo the wiring connector retaining bolt
then carefully disconnect the wiring plug and
remove the module from the car (see
illustration).
17 Refitting is a reverse of the removal
procedure ensuring that the wiring plug bolt is
securely tightened. On completion start the
engine and check that it runs correctly.
19 Carburettor stepper motor
(2.0 litre models) - removal,
refitting and adjustment
Note: Irregular idle is not necessarily caused
by a faulty or badly adjusted stepper motor.
Good electrical contact between the stepper
motor plunger and the adjusting screw is
essential. Before attempting adjustment or
renewal of the motor, try the effect of cleaning
the plunger and adjusting screw contact faces
with abrasive paper followed by switch
cleaning fluid. Switch cleaning fluid is available
from electronic component shops.
1 Disconnect the battery negative lead.
2 Remove the air cleaner.
3 Disconnect the multi-plug from the stepper
motor. Release the locking clip and pull on the
plug, not on the wires.
4 Remove the four screws which secure the
stepper motor bracket to the carburettor.
19.6 Throttle lever initial adjustment
A Plunger
X 7.5 ±1.0 mm
B Adjusting screw
(0.30 ± 0.04 in)
C Cap
18.16 Disconnecting the EEC IV module
A Multi-plug
B Securing bolt
Remove the motor and bracket and separate
them (see illustration).
5 Refit the motor and bracket to the
carburettor and secure with the four screws.
Reconnect the multi-plug.
6 Make an initial adjustment to the throttle
lever adjusting screw if necessary so that it
protrudes from the lever by dimension X (see
illustration).
7 Reconnect the air cleaner vacuum hose.
Position the air cleaner to one side so that
there is still access to the carburettor and
stepper motor.
8 Connect a tachometer (rev. counter) to the
engine as instructed by the manufacturers.
Reconnect the battery.
9 Run the engine. Check the idle mixture (CO
level) as described in Chapter 4 and adjust if
necessary.
10 Switch off all electrical loads (headlights,
heater blower etc). If the idle speed adjustment
lead is earthed, temporarily isolate it. Make
sure that the automatic transmission selector is
in the N or P position (where applicable).
11 Accelerate the engine to a speed greater
then 2500 rpm, allow it to return to idle, then
repeat. Insert a feeler blade of thickness 1.0
mm (0.04 in) between the stepper motor
plunger and the adjusting screw (see
illustration). With the feeler blade in place,
engine speed should be 875 ± 25 rpm.
19.11 Stepper motor adjustment
A Locknut
B Feeler blade
19.4 Carburettor stepper motor and
mounting bracket
12 If adjustment is necessary, remove the
tamperproof cap from the adjusting screw
locknut. Release the locknut, turn the
adjusting screw to achieve the correct speed
and tighten the locknut.
13 Repeat paragraph 11 and check that the
speed is still correct. Readjust if necessary.
14 Remove the feeler blade. Stop and restart
the engine, observing the stepper motor
plunger. Immediately after switching off, the
plunger should move to the "anti-dieseling"
position; after a few seconds it should extend
to the "vent manifold/start" position (see
illustration).
15 Disconnect the test gear and refit the air
cleaner.
16 Recheck the idle mixture.
17 Fit new tamperproof plugs or caps if
necessary - see Chapter 4,
18 Reconnect the idle speed adjustment lead
if it was earthed.
20 Coolant temperature sensor -
removal and refitting
1 The
engine
management
temperature sensor is located on the underside
of the inlet manifold (SOHC engines), the side
of the manifold (DOHC engines) or on the front
face of the cylinder block (V6 engines).
19.14 Stepper motor plunger positions
A Vent manifold/start
C Idle
B Anti-dieseling
system
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