2000 MITSUBISHI MONTERO Service Repair Manual

GDI -General Information13A-3
GENERAL INFORMATION
The Gasoline Direct Injection System consists
of sensors which detect the engine conditions,
the engine-ECU or engine-A/T-ECU
which controls the system based on
signals from these sensors, and actuators
which operate under the control of the
engine-ECU or engine-A/T-ECU .The engine-ECU or engine-A/T-ECU
carries out activities such as fuel injection
control, idle speed control and ignition timing
control. In addition, the engine-ECU or
engine-A/T-ECU is equipped with several
diagnosis modes which simplify troubleshooting
when a problem develops.
FUEL INJECTION CONTROL
The injector drive times and injector timing are
controlled so that the optimum air/fuel mixture
is supplied to the engine to correspond to the
continually-changing engine operation condi-
tions.
A single injector for each cylinder is mounted
at the cylinder head. The fuel is sent under
pressure from the fuel tank to the fuel pressure
regulator (low pressure) by the fuel pump (low
pressure). The pressure is regulated by the
fuel pressure regulator (low pressure) and the
fuel regulated is then sent to the fuel pump
(high pressure). The fuel under increased
pressure generated by the fuel pump (high
pressure) is then regulated by the fuel pressure
regulator (high pressure) and is then distributed
to each of the injectors via the delivery pipes.Fuel injection is normally carried out once for
each cylinder for every two rotations of the
crankshaft. The firing order is 1-2-3-4-5-6. This
is called sequential fuel injection.
When the engine is cold or under a severe
load, the “open-loop” control keeps the air/fuel
ratio at a richer than usual level to maintain
driveability. When the engine is under low or
medium loads, the air/fuel ratio becomes leaner
to reduce fuel consumption. When the engine
is running at medium or high loads after having
warmed up, the “closed-loop” control uses the
signal from the oxygen sensor to keep the
air/fuel ratio at the optimum theoretical level.
THROTTLE VALVE OPENING ANGLE CONTROL
This system controls throttle valve opening
angle electronically. The engine-ECU
or engine-A/T-ECU determines how
deeply the accelerator pedal is depressed by
means of the accelerator position sensor (APS).
Then the engine-ECU or engine-A/T-ECU sends a target value of the
throttle valve opening angle to the throttle valve
controller. The throttle valve control servo
operates the throttle valve so that it reaches
the target opening angle.
IDLE SPEED CONTROL
This system maintains engine idle speed at
a predetermined condition by controlling the
air flow that passes through the throttle valve
according to engine idling condition and engine
loads at idling.
The engine-ECU or engine-A/T-ECU
operates the throttle valve control servoso that engine speed is maintained within a
map value. The map value is predetermined
according to engine coolant temperature and
air-conditioning load.
IGNITION TIMING CONTROL
The power transistor located in the ignition
primary circuit turns ON and OFF to control
the primary current flow to the ignition coil. This
controls the ignition timing in order to provide
the optimum ignition timing with respect to the
engine operating conditions. The ignition timingis determined by the engine-ECU or
engine-A/T-ECU from the engine speed,
intake air volume, engine coolant temperature,
atmospheric pressure and injection timing
(intake stroke or compression stroke).


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GDI -General Information13A-4
SELF-DIAGNOSIS FUNCTION
DWhen an abnormality is detected in one
of the sensors or actuators related to
emission control, the engine warning lamp
(check engine lamp) illuminates or flashes
as a warning to the driver.
DWhen an abnormality is detected in one
of the sensors or actuators, a diagnosis
code corresponding to the abnormality is
output.
DThe engine-ECU records the engine
operating condition when the diagnosis
code is set. This data is called “freezeframe” data.
This data can be read by using the MUT-II,
and can then be used in simulation tests
for troubleshooting. M/T>
DThe RAM data inside the engine-ECU
or engine-A/T-ECU that is
related to the sensors and actuators can
be read by means of the MUT-II. In addition,
the actuators can be force-driven under
certain circumstances.
OTHER CONTROL FUNCTIONS
1. Fuel Pump Control
Turns the fuel pump relay ON so that current
is supplied to the fuel pump while the engine
is cranking or running.
2. A/C Relay Control
Turns the compressor clutch of the A/C
ON and OFF.3. Purge Control Solenoid Valve Control
Refer to GROUP 17.
4. EGR Control Servo Control
Refer to GROUP 17.
GENERAL SPECIFICATIONS
ItemsSpecifications
Throttle bodyThrottle bore mm65
Throttle position sensorVariable resistor type
Throttle valve control servoBrushless DC-motor type
Engine-ECUIdentification model No.E2T79271 Engine-ECU
Identification model No.E2T79271
E2T79272
Engine-Identification model No.E2T76277
A/T-ECU
E2T76278


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GDI -General Information13A-5
Items Specifications
SensorsAir flow sensorKarman vortex type
Barometric pressure sensorSemiconductor type
Intake air temperature sensorThermistor type
Engine coolant temperature sensorThermistor type
Oxygen sensorZirconia type
Accelerator pedal position sensor (1st
and 2nd channels)Variable resistor type
Accelerator pedal position switchRotary contact type, within accelerator pedal position
sensor (1st channel)
Vehicle speed sensorMagnetic resistive element type
Inhibitor switchContact switch type
Camshaft position sensorHall element type
Crank angle sensorHall element type
Detonation sensorPiezoelectric type
Fuel pressure sensorMetallic membrane type
Power steering fluid pressure switchContact switch type
ActuatorsEngine control relay typeContact switch type
Fuel pump relay typeContact switch type
Injector driver control relayContact switch type
Injector type and numberElectromagnetic type, 6
Injector identification markDIM 1070
Throttle valve control servo relayContact switch type
Throttle valve control servoBrushless DC-motor type
EGR valveStepper motor type
Purge control solenoid valveDuty cycle type solenoid valve
Fuel pressure
regulator (low
pressure)Regulator pressure kPa329
Fuel pressure
regulator
(high pres-
sure)Regulator pressure MPa5.0


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F
uelp re ssu re
r e gula to r (lo w
p re ssu re ) T
o fu elta nk
L6 Cam sh aft posit io n se nso r
L 2 Oxyg en se nso r (re ar)
L
9 Engin e co ola nt te m pera -
t u re se nso r z
1 In je cto r driv e r
z3 Purg e co ntr o l so le noid va lv e
L
4 In ta ke air te m pera tu re
s e nso r
L 8 Baro m etr ic pre ssu re
s e nso r
L
3 Air flo w se nso r
In ta ke
a ir
C anis te r F
ro m fu elp um p
( lo w pre ssu re ) L
5
Thro ttle posi-
t io n se nso r
( 2 nd ch annel)
L 1
1 T hro ttle posit io n
s e nso r (1 st
c h annel)
z
4 Thro ttle co ntr o l se rv o
L 7 Cra nk angle se nso r
z
2 EG R
v a lv e
L 1 Oxyg en se nso r (fr o nt)
L
10 Fuel pre ssu re
s e nso r
w
ww.W ork sh opM an uals .c o .u k
P urc h ased f r o m w ww.W ork sh opM an uals .c o .u k

S
ER VIC E SPEC IF IC ATIO NS
I te m S
ta ndard va lu e A
dju stm ent vo lt a ge of th ro ttle posit io n se nso r (1 st ch annel) V 0
.4 -0.6 A
dju stm ent vo lt a ge of th ro ttle posit io n se nso r (2 nd ch annel) V 4
.2 -4.8 T
hro ttle posit io n se nso r re sis ta nce kW A
dju stm entvo lt a ge ofa cce le ra to r pedalp osit io n se nso rs 1 and 2 V 0
.9 85 -1.0 85 R
esis ta nce of acce le ra to r pedalp osit io n se nso rs 1 and 2kW I
n ta ke air te m pera tu re se nso r re sis t- a
t 20_C 2
.3 -3.0 a
nce kW 0
.3 0 -0.4 2 E
ngin e co ola nt te m pera tu re se nso r a
t 20_C 2
.1 -2.7 r
e sis ta nce kW 0
.2 6 -0.3 6 F
uelp re ssu re H
ig h-p re ssu re sid e MPa 4
-6.9 L
ow -p re ssu re sid e kP a A
ppro xim ate ly 329 I
n je cto r co il re sis ta nce (a t 20_C )W O
xyg en se nso r outp utvo lt a ge V (d urin g re vvin g) 0
.6 -1.0 O
xyg en se nso r heate r re sis ta nce (a t 20_C )W T
hro ttle co ntr o lse rv o co il re sis ta nce (a t 20_C )W S
pecif ie d se ala nt R
em ark E
ngin e co ola nt te m pera tu re se nso r 3
M Nut Lockin g Part No.4 171 or
e quiv a le nt D
ry in g se ala nt N
um ber N
am e U
se M
B991502 M
UT-II su b as-
s e m bly

M
B991348,
M B991658 T
e st harn ess se t M
B991709 M
B991519 A
lt e rn ato r harn ess
c o nnecto r T
ro uble sh ootin g -vo lt a ge measu re m ent M
D998478 T
e st harn ess
( 3 -p in , sq uare ) M
D998464 T
e st harn ess
( 4 -p in , sq uare ) O
xyg en se nso r ch eck M
B991529 D
ia gnosis co de
c h eckin g harn ess T
a ke a re adin g of th e dia gnosis co des M
D998709 A
dapto r hose F
uelp re ssu re measu re m ent M
D998742 H
ose adapto r M
B991637 F
uel pre ssu re
g auge se t

T
R O UBLE SH O OTIN G
S TA NDARD FLO W OF DIA G NO STIC
T R O UBLE SH O OTIN G
R efe r to GRO UP 00 -H ow to Use Tro uble sh ootin g/In sp ectio n
S erv ic e Poin ts .
N O TE
W hen re pla cin g th e engin e-E C U, re pla ce im mobiliz e r-E C U
a nd ig nit io n ke y as well at th e sa m e tim e.
D IA G NO SIS FU NCTIO N
E N G IN E WARNIN G LA M P (C HEC K EN G IN E LA M P)
I f an abnorm alit y occu rs in any of th e fo llo w in g it e m sre la te d
t o th e GDIsyste m ,th e engin e warn in g la m p will illu m in ate
o r fla sh .
I f th e la m pre m ain s illu m in ate d or if th e la m p illu m in ate s while
t h e engin e is ru nnin g, ch eck th e dia gnosis co de outp ut.
E ngin e warn in g la m p in sp ectio n it e m s
C ode No. D
ia gnosis it e m - E
ngin e-E C U P
0100 A
ir flo w se nso r syste m P
0105 B
aro m etr ic pre ssu re se nso r syste m P
011 0 I
n ta ke air te m pera tu re se nso r syste m P
011 5 E
ngin e co ola nt te m pera tu re se nso r syste m P
0120 L P
0125 F
eedback syste m P
0130 O
xyg en se nso r (fr o nt) syste m P
0135 O
xyg en se nso r heate r (fr o nt) syste m P
0136 O
xyg en se nso r (re ar) syste m P
0141 O
xyg en se nso r heate r (re ar) syste m P
0170 A
bnorm alfu els yste m P
0190 L P
0201 N
o.1 in je cto r syste m P
0202 N
o.2 in je cto r syste m P
0203 N
o.3 in je cto r syste m P
0204 N
o.4 in je cto r syste m P
0205 N
o.5 in je cto r syste m

GDI -Troubleshooting 13A-10
Code No. Diagnosis item
P0206No.6 injector system
P0220LAccelerator pedal position sensor (1st channel) system
P0225LThrottle position sensor (2nd channel) system
P0300LIgnition coil (power transistor) system
P0301No.1 cylinder misfire detected.
P0302No.2 cylinder misfire detected.
P0303No.3 cylinder misfire detected.
P0304No.4 cylinder misfire detected.
P0305No.5 cylinder misfire detected.
P0306No.6 cylinder misfire detected.
P0335Crank angle sensor system
P0340Camshaft position sensor system
P0403EGR valve system
P0420Catalyst malfunction
P0443Purge control solenoid valve system
P1200Injector driver system
P1220LElectronic-controlled throttle valve system
P1221LThrottle valve position feedback system
P1222LThrottle control servo system
P1223LCommunication line system with throttle valve controller
P1225LAccelerator pedal position sensor (2nd channel) system
P1226LThrottle valve controller system
NOTE
1. If the engine warning lamp illuminates because of a malfunction of the engine-ECU, communication
between MUT-
IIand the engine-ECU is impossible. In this case, the diagnosis code cannot be read.
2. After the engine-ECU has detected a malfunction, the engine warning lamp illuminates when the
engine is next turned on and the same malfunction is re-detected. However, for items marked with
a“
L” in the diagnosis code number column, the engine warning lamp illuminates only on the first
detection of the malfunction.
If diagnosis code P0120, P0220, P0225 or P1225 is set, the engine warning lamp will flash. If the
1st and 2nd channels of the throttle postion sensor or the acccelerator pedal position sensor fail
at the same time, the engine warning lamp will also flash.
3. After the engine warning lamp illuminates, it will be switched off under the following conditions.
(1) When the engine-ECU monitored the power train malfunction three times* and met set condition
requirements, it detected no malfunction.
*: In this case, “one time” indicates from engine start to stop.
(2) For misfiring malfunction, when driving conditions (engine speed, engine coolant temperature,
etc.) are similar to those when the malfunction was first recorded.


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