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12 MMFD Mono-point G5 and
G6 system components -
removal and refitting
3
Note: Check the availability of individual
components with your Peugeot dealer before
dismantling.
Fuel pressure regulator
1 Refer to Section 11, Paragraphs 1 to 3
noting the revised component arrangement
(see illustration).
Fuel injector
Note: Refer to the warning note in Section 1
before proceeding. If a faulty injector is
suspected, before condemning the injector, it
is worth trying the effect of one of the
proprietary injector-cleaning treatments. Note
that at the time of writing, the injector does
not appear to be available separately from the
throttle body upper section assembly.
2 Disconnect the battery negative lead.
3 Remove the air inlet trunking from the top of
the throttle body.
4 Release the securing clip, and disconnect
the injector wiring plug (see illustration).
5 Remove the Torx screw securing the
injector retainer plate to the top of the throttle
body (see illustration), lift off the retainer,
then withdraw the injector. Recover and
discard the injector sealing rings (check to
ensure that new sealing rings can be obtained
before discarding the old ones).
6 Refitting is the reverse of the removal
procedure, noting the following points.
a) Always renew both sealing rings; apply a
smear of grease to each, to ease injector
refitting.
b) Refit the injector so that its wiring
terminals point towards the front of the
vehicle, and locate the edge of the
retainer securely in the groove at the top
of the injector.
c) Before refitting the injector securing
screw, apply a few drops of a suitable
thread-locking compound to the threads.
d) On completion, switch on the ignition,
and check carefully for signs of fuel leaks;
if any signs of leakage are detected, the
problem must be rectified before the
engine is started.
Throttle switch
7 Disconnect the battery negative lead.
8 Disconnect the wiring plug, and disconnect
the wiring plug from the switch.
9 Remove the two securing screws and
withdraw the switch.
10 Refitting is a reversal of removal, noting
the following points.
a) Before refitting the switch, ensure that the
throttle valve is fully closed.
b) Ensure that the switch wiper engages
correctly with the throttle shaft.
Idle speed control valve (MMFD
G5 system)
11 For improved access, remove the air
cleaner trunking.
12 Disconnect the battery negative lead.
13 Release the securing clip, and disconnect
the wiring plug from the valve.
14 Loosen the securing clamps, and
disconnect the air hoses from the valve. Note
the locations of the hoses to ensure correct
refitting.
15 Remove the securing screws, and
withdraw the valve.
16 Refitting is a reversal of removal, noting
that the arrows cast on the valve unions
indicate the direction of airflow through the
valve. Ensure that the hoses are securely
refitted, to prevent air leaks.
Idle speed control motor (MMFD
G6 system)
Note: At the time of writing, it was not clear
whether the motor is available separately from
the throttle body assembly. It is advisable to
seek the advice of a Peugeot dealer before
deciding on the course of action to be
followed if the motor is thought to be faulty.
17 For improved access, remove the air inlet
trunking.
18 Disconnect the battery negative lead.
19 Release the securing clip, and disconnect
the wiring plug from the motor.
20 Remove the two securing screws, then
withdraw the motor. Recover and discard the
sealing ring (check to ensure that a new
sealing ring can be obtained before
discarding the old one).
21 Refitting is a reversal of removal bearing
in mind the following points.
a) Always fit a new sealing ring, greasing it
lightly to ease installation.
b) The control motor will be reset by the
ECU as soon as the engine is restarted.
c) Apply suitable thread-locking compound
to the securing screw threads before
refitting.
4B•6 Fuel system - single-point fuel injection engines
12.5 Fuel injector retaining plate securing
screw (arrowed)
12.1 Fuel pressure regulator (A) and fuel injector wiring plug (B) 12.4 MMFD G6 fuel injection system throttle body assembly
1 Fuel injector wiring connector
2 Fuel pressure regulator
3 Idle speed control motor
4 Throttle switch