headlamp FORD SIERRA 1982 1.G Engine Electrical Systems Workshop Manual

Removal
1Disconnect the battery leads.
2Disconnect the multi-plug, or disconnect
the wires from their terminals on the rear of
the alternator, noting their locations (as
applicable), then slacken the mounting and
adjustment bolts and tilt the alternator
towards the engine (see illustrations).
3Remove the drivebelt(s) from the alternator
pulley(s).
4Remove the mounting and adjustment nuts
and bolts, and withdraw the alternator from
the engine.
Refitting
5Refitting is a reversal of removal, noting the
following points.
6To avoid breakage of the alternator
mounting bracket lugs, it is important that the
following procedure is adhered to when
refitting the mounting bolts.
7Always refit the large flat washer (A) (see
illustration).
8Earlier models (before 1985) also have a
small washer (B) which must be fitted between
the sliding bush and the mounting bracket.
9Ensure that the bushes and bolts are
assembled as shown - except on 2.0 litre
DOHC models where a through-bolt is used,
then tension the drivebelt(s) and tighten the
mounting and adjustment bolts as shown in
the relevant illustration in Chapter 3.Refer to Chapter 1, Section 21.
Note: To carry out the complete test procedure
use only the following test equipment - a 0 to
20 volt moving coil voltmeter, a 0 to 100 amp
moving coil ammeter, and a rheostat rated at
30 amps.
1Check that the battery is at least 70%
charged by using a hydrometer.
2Check the drivebelt tension.
3Check the security of the battery leads,
alternator multi-plug, and interconnecting wire.
Cable continuity check
4Pull the multi-plug from the alternator and
switch on the ignition, being careful not to crank
the engine. Connect the voltmeter between a
good earth and each of the terminals in the
multi-plug in turn. If battery voltage is not
indicated, there is an open circuit in the wiring
which may be due to a blown ignition warning
light bulb if on the small terminal.
Alternator output check
5Connect the voltmeter, ammeter and
rheostat as shown (see illustration).Run the
engine at 3000 rpm and switch on the
headlamps, heater blower and, where fitted,
the heated rear window. Vary the resistanceto increase the current and check that the
alternator rated output is reached without the
voltage dropping below 13 volts.
Charging circuit positive side
check
6Connect the voltmeter as shown (see
illustration).Start the engine and switch on
the headlamps. Run the engine at 3000 rpm
and check that the indicated voltage drop
does not exceed 0.5 volt. A higher reading
indicates a high resistance such as a dirty
connection on the positive side of the
charging circuit.
Charging circuit negative side
check
7Connect the voltmeter as shown (see
illustration).Start the engine and switch on
the headlamps. Run the engine at 3000 rpm
and check that the indicated voltage drop
does not exceed 0.25 volt. A higher reading
indicates a high resistance such as a dirty
connection on the negative side of the
charging circuit.
Voltage regulator check
8Connect the voltmeter and ammeter as
shown(see illustration).Run the engine at
3000 rpm and when the ammeter records a
current of 3 to 5 amps check that the voltmeter
records 13.7 to 14.15 volts. If the result is
outside the limits the regulator is faulty.
6Alternator - testing
5Alternator drivebelt(s) - checking,
renewal and tensioning4Alternator - removal and
refitting
5•6Engine electrical systems
4.2a Disconnecting the multi-plug from a
Bosch alternator4.7 Alternator mounting bracket
arrangement
A Large flat washer
B Small flat washer (models up to 1985 only)
C Mounting bracket (engine)
D Mounting lugs (alternator)
6.7 Alternator negative check circuit6.6 Alternator positive check circuit6.5 Alternator output test circuit
4.2b Removing the insulating cap from the
main wiring terminal on a Lucas A127
alternator (CVH model)

3Partially drain the cooling system. There is no
need to remove the cylinder block drain plug.
4Disconnect the sensor wiring plug by
pulling on the plug, not the wiring (see
illustration).
5Unscrew the sensor from the inlet manifold
and remove it.
6Refitting is a reversal of removal. Fill the
cooling system.
2.0 litre DOHC models
7The sensor is located in the side of the inlet
manifold. The removal and refitting
procedures are as described for the 1.6 and
1.8 litre CVH (R6A type) engines in the
relevent Section of this Chapter.
Inlet manifold heater
Note: When refitting the heater, a new gasket
and O-ring must be used.
8Do not attempt to remove the heater while it
is hot.
9For improved access, remove the air
cleaner.
10Disconnect the wiring from the heater.
11Unscrew the three securing bolts and
remove the heater. Recover the gasket and
O-ring (see illustration).
12Refitting is a reversal of removal, using a
new gasket and O-ring, but be careful to
tighten the securing bolts evenly, otherwise
the heater may tilt and jam in its recess.
Carburettor stepper motor (2.0
litre models)
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 (which from the
throttle position switch) 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. Refer to the precautions in
Chapter 3 before proceeding.
13Remove the air cleaner.
14Depress the locking tab and disconnect
the stepper motor wiring plug. Pull on the
plug, not the wiring.
15Remove the four securing screws and
withdraw the stepper motor and bracket from
the carburettor.
16If desired, the stepper motor can be
separated from the bracket by removing thefour securing screws (see illustration).
17Commence refitting by securing the
stepper motor to the bracket, where
applicable.
18Refit the stepper motor and bracket to the
carburettor and secure with the four screws.
19Reconnect the wiring plug.
20Reconnect the air cleaner vacuum hose to
the inlet manifold, and position the air cleaner
to one side to allow access to the carburettor
and stepper motor.
21Reconnect the battery negative lead.
22Connect a tachometer to the engine in
accordance with the manufacturer’s
instructions.
23Start the engine, then check and if
necessary adjust the idle mixture.
24Ensure that all electrical loads are
switched off (headlamps, heater blower etc). If
the “idle speed adjustment” wire is earthed,
temporarily isolate it. Where applicable,
ensure that the automatic transmission gear
selector lever is in the “N” or “P” position.
25Accelerate the engine to a speed greater
than 2500 rpm, allow it to return to idle, then
repeat. Insert a feeler blade of 1.0 mm (0.04
in) thickness between the stepper motor
plunger and the adjusting screw (see
illustration). With the feeler blade in place the
engine speed should be 875 ±25 rpm.
26If adjustment is necessary, remove the
tamperproof cap from the adjusting screw
locknut. Slacken the locknut, then turn the
adjusting screw to achieve the correct enginespeed and tighten the locknut.
27Repeat the procedure given in paragraph
24 and check that the engine speed is still
correct. Readjust if necessary.
28Stop the engine, remove the feeler blade,
and disconnect the tachometer.
29Refit the air cleaner, ensuring that the
vacuum hose is securely connected. If the
“idle speed adjustment” wire was previously
earthed, reconnect it.
30Re-start and then stop the engine,
observing the movement of the stepper motor
plunger. Immediately after stopping the
engine, the plunger should move to the
“anti-dieselling” position, and after a few
seconds it should extend to the “vent
manifold/start” position (see illustration).
31Re-check and adjust the idle mixture.
32If necessary, refit the tamperproof caps to
the mixture adjustment screw and the stepper
motor adjustment screw locknut.
Crankshaft speed/position sensor
(2.0 litre DOHC models)
33The sensor is located at the right-hand
rear of the cylinder block behind the oil filter.
34Disconnect the battery negative lead.
35Access is most easily obtained from
underneath the vehicle. To improve access,
apply the handbrake, then jack up the front of
the vehicle and support it securely on axle
stands (see “Jacking and Vehicle Support”).
36Disconnect the wiring plug from the sensor.
37Remove the securing screw, and
withdraw the sensor from its location in the
cylinder block (see illustration).
Engine electrical systems 5•21
5
19.25 Carburettor stepper motor adjustment
- 2.0 litre models with ESC II system
A LocknutB Feeler blade
19.37 Removing the crankshaft
speed/position sensor (engine removed)
19.30 Carburettor stepper motor plunger
positions - 2.0 litre models with ESC II
system
A Vent manifold/start
B Anti-dieselling
C Normal idle
19.16 Carburettor stepper motor adjustment
- 2.0 litre models with ESC II system19.11 Removing inlet manifold heater -
ESC II system