Mitsubishi Space Star. Manual — part 54
MPI –
General Information
13B-3
MULTI-POINT FUEL INJECTION SYSTEM DIAGRAM
1 Oxygen sensor (front)
2 Vacuum sensor
3 Intake air temperature sensor
4 Throttle position sensor
5 Camshaft position sensor
6 Crank angle sensor
7 Engine coolant temperature sensor
8 Detonation sensor
9 Oxygen sensor (rear)
Power supply voltage
Vehicle speed sensor
A/C switch
Power steering fluid pressure switch
Vehicle speed sensor
Ignition switch – ST
Ignition switch – IG
Engine-
ECU
1 Injector
2 Purge control solenoid valve
3 Idle speed control valve
4 EGR control servo valve
Fuel pump relay
Engine control relay
A/C power relay
Engine warning lamp
Diagnosis signal
Ignition coil (power transistor)
Fan controller
2 Vacuum sensor
3 Intake air temperature sensor
3 Idle speed control valve
Air cleaner
To fuel
tank
Fuel pressure
regulator
From fuel
pump
PCV valve
1
Injector
EGR valve
4 Throttle position sensor
7 Engine coolant
temperature sensor
4 EGR control solenoid valve
Canister
2 Purge control
solenoid valve
1 Oxygen
sensor
(front)
9 Oxygen
sensor (rear)
6 Crank angle sensor
Catalytic
converter
Air
8 Detonation
sensor
Catalytic
converter
5 Camshaft position sensor
MPI –
Service Specifications/Special Tools
13B-4
SERVICE SPECIFICATIONS
Items
Standard value
Intake air temperature sensor resistance k
Ω
20
C
2.3 – 3.0
80
C
0.30 – 0.42
Oxygen sensor output voltage (during revving) V
0.6 – 1.0
Oxygen sensor heater resistance (at 20
C)
Ω
Front
4.5 – 8.0
Rear
11 – 18
SPECIAL TOOLS
Tool
Number
Name
Use
MB991536
Throttle position
sensor adjustment
harness
Measurement of voltage during trouble-
shooting
MB991658
Test harness set
Measurement of voltage during trouble-
shooting
MD998464
Test harness
(4-pin, square)
Measurement of voltage during trouble-
shooting
Inspection of oxygen sensor (front)
MD998478
Test harness
(3-pin, triangle)
Measurement of voltage during trouble-
shooting
Inspection using an analyzer
MPI –
Troubleshooting
13B-5
TROUBLESHOOTING
DIAGNOSIS FUNCTION
ENGINE WARNING LAMP (CHECK ENGINE LAMP)
If an abnormality occurs in any of the following items related
to the Multipoint Fuel Injection (MPI) system, the engine
warning lamp will illuminate. If the lamp remains illuminated
or if the lamp illuminates while the engine is running, check
the diagnosis code output.
However, the warning lamp will illuminate as bulb check for
five seconds whenever the ignition switch is turned to the
ON position.
Engine warning lamp inspection items
Code No.
Diagnosis item
–
Engine-ECU
P0105
Vacuum sensor system
P0110
Intake air temperature sensor system
P0115
Engine coolant temperature sensor system
P0120
Throttle position sensor system
P0125
Feedback system
P0130
Oxygen sensor (front) system <sensor 1>
P0135
Oxygen sensor heater (front) system <sensor 1>
P0136
Oxygen sensor (rear) system <sensor 2>
P0141
Oxygen sensor heater (rear) system <sensor 2>
P0170
Abnormal fuel system
P0201
No. 1 injector system
P0202
No. 2 injector system
P0203
No. 3 injector system
P0204
No. 4 injector system
P0300
Random cylinder misfire detected
P0301
No. 1 cylinder misfire detected
P0302
No. 2 cylinder misfire detected
P0303
No. 3 cylinder misfire detected
P0304
No. 4 cylinder misfire detected
P0335
Crank angle sensor system
P0340
Camshaft position sensor system
P0403
EGR control solenoid valve system
P0420
Catalyst malfunction
P0443
Purge control solenoid valve system
P0505
Idle speed control system
Engine warning lamp
(check engine lamp)
MPI –
Troubleshooting
13B-6
NOTE
1.
If the engine warning lamp illuminates because of a malfunction of the engine-ECU, communication
between MUT-
II
and 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 “
”
in the diagnosis code number column, the engine warning lamp illuminates only on the first detection
of the malfunction.
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.
4.
Sensor 1 indicates the sensor mounted at a position closest to the engine, and sensor 2 indicates
the sensor mounted at the position second closest to the engine.
METHOD OF READING AND ERASING DIAGNOSIS
CODES
Refer to GROUP 00 – How to Use Troubleshooting/Inspection
Service Points.
DIAGNOSIS USING DIAGNOSIS 2 MODE
1.
Switch the diagnosis mode of the engine control unit to
DIAGNOSIS 2 mode using the MUT-
II
.
2.
Carry out a road test.
3.
Take a reading of the diagnosis code and repair the problem
location.
4.
Turn the ignition switch to OFF and then back to ON again.
NOTE
By turning the ignition switch to OFF, the engine-ECU will
switch the diagnosis mode from DIAGNOSIS 2 mode to
DIAGNOSIS 1 mode.
5.
Erase the diagnosis codes.
INSPECTION USING MUT-
II
DATA LIST AND
ACTUATOR TESTING
1.
Carry out inspection by means of the data list and the
actuator test function. If there is an abnormality, check
and repair the chassis harnesses and components.
2.
After repairing, re-check using the MUT-
II
and check that
the abnormal input and output have returned to normal
as a result of the repairs.
3.
Erase the diagnosis code memory.
4.
Remove the MUT-
II
, and then start the engine again and
carry out a road test to confirm that the problem has
disappeared.
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст