Mitsubishi Lancer Evolution IX. Manual — part 385
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-15
Procedure 3
READINESS TEST STATUS
The engine-ECU monitors the following main diagno-
sis items, judges if these items are in good condition
or not, and the stores its history. This history can be
read out by using M.U.T.-II/III. (If the ECU has judged
a item before, the M.U.T.-II/III displays "Complete").
In addition, if diagnosis codes are erased or the bat-
tery cable is disconnected, this history will also be
erased (the memory will be reset).
• Catalyst: P0421
• Oxygen sensor: P0130
• Oxygen sensor heater: P0135, P0141
Other monitor
Diagnosis
code No.
P0136, P0201, P0202, P0203, P0204, P0300, P0301, P0302, P0303, P0304, P0325,
P0500, P0551
Drive cycle
pattern
One trip monitor [from start to ignition switch to "LOCK" (OFF) position] will be completed
while traveling with the following drive cycle pattern. It will take 21 minutes or more.
Inspection
conditions
• Engine coolant temperature: After engine warm up
• Atmospheric temperature: −10°C or more
Test
procedure
1. Engine: start
2. Accelerate until the vehicle speed is 55 km/h.
3. While keeping the accelerator pedal opening degree constant, keep the vehicle speed at
55 km/h and travel for 16 minutes or more.
4. Return the vehicle to the shop.
5. After stopping the vehicle, continue idling for 5 minutes, and then turn the ignition switch
to "LOCK" (OFF) position.
AK301817
16 minutes or more
Ignition switch :
"LOCK" (OFF)
position
Engine Start
Vehicle
speed
55 km/h or more
(1)
(4)
(3)
(2)
(5)
Time
AB
5 minutes or more
Engine: Idling
Transmission: Neutral
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-16
FAIL-SAFE FUNCTION REFERENCE TABLE
When the main sensor malfunctions are detected by the diagnosis function, the vehicle is controlled by
means of the pre-set control logic to maintain safe conditions for driving.
Malfunctioning item
Control contents during malfunction
Air flow sensor
1. Uses the throttle position sensor signal and engine speed signal (crank angle
sensor signal) to take reading of the basic injector drive time and basic ignition
timing from the pre-set mapping.
2. Fixes the idle speed control servo in the appointed position so idle control is not
performed.
Intake air temperature
sensor
Controls as if the intake air temperature is 25
°C.
Barometric pressure
sensor
Controls as if the barometric pressure is 101 kPa.
Throttle position sensor No increase in fuel injection amount during acceleration due to the throttle position
sensor signal.
Engine coolant
temperature sensor
Controls as if the engine coolant temperature is 80
°C.
Intake camshaft
position sensor
Turns the oil feeder control valve OFF, and sets the valve timing to the most
retarded angle.
Exhaust camshaft
position sensor
1. Injects fuel simultaneously into all cylinders (provided that the TDC of the No. 1
cylinder is not detected even once after the ignition switch has been turned
"ON").
2. Cuts the supply of fuel 4 seconds after detecting a failure (provided that the TDC
of the No. 1 cylinder is not detected even once after the ignition switch has been
turned "ON").
Oxygen sensor (front)
Air-fuel ratio feedback control (closed loop control) is not performed.
Oxygen sensor (rear)
Performs the feedback control (closed loop control) of the air-fuel ratio by using
only the signal of the oxygen (front) installed on the front of the catalytic converter.
Detonation sensor
Fixes the ignition timing as that for regular gasoline.
Ignition coil
(incorporating power
transistor)
Cuts off the fuel supply to cylinders with an abnormal ignition.
Alternator FR terminal
Does not control the output of the alternator according to an electrical load. (works
as a normal alternator)
Misfiring
If the detected misfiring causes damage to the catalyst, the misfiring cylinder will be
shut down.
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-17
INSPECTION CHART FOR DIAGNOSIS CODE
M1131151001962
Code No.
Diagnosis item
Reference page
P0090
Fuel pressure control solenoid valve system
P0100
Air flow sensor system
P0105
Barometric pressure sensor system
P0110
Intake air temperature sensor system
P0115
Engine coolant temperature sensor system
P0120
Throttle position sensor system
P0125*
Feedback system monitor
P0130
Oxygen sensor (front) system
P0135
Oxygen sensor heater (front) system
P0136
Oxygen sensor (rear) system
P0141
Oxygen sensor heater (rear) system
P0170
Abnormal fuel system
P0201
No. 1 Injector system
P0202
No. 2 Injector system
P0203
No. 3 Injector system
P0204
No. 4 Injector system
P0234
Turbocharger wastegate system malfunction
P0243
Waste gate solenoid valve system
P0300
Random cylinder misfire detection system
P0301*
No. 1 cylinder misfire detection system
P0302*
No. 2 cylinder misfire detection system
P0303*
No. 3 cylinder misfire detection system
P0304*
No. 4 cylinder misfire detection system
P0325
Detonation sensor system
P0335
Crank angle sensor system
P0340
Exhaust camshaft position sensor system
P0403
EGR control solenoid valve system
P0421
Warm up catalyst malfunction
P0443
Purge control solenoid valve system
P0500
Vehicle speed sensor system
P0505
Idle speed control system
P0513
Immobilizer system
P0551*
Power steering fluid pressure switch system
P0622
Alternator FR terminal system
P0710
Transmission oil temperature sensor system
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI)
13A-18
NOTE:
.
•
Do not replace the engine-ECU until a through terminal check reveals there are no short/open circuit.
•
Check that the engine-ECU earth circuit is normal before checking for the cause of the problem.
•
After the engine-ECU has detected a malfunction, a diagnosis code is recorded the next time the engine
is started and the same malfunction is re-detected. However, for items marked with "*", the diagnosis code
is recorded on the first detection of the malfunction.
•
Sensor 1 indicates the sensor mounted at a position closest to the engine, and sensor 2 indicates the sen-
sor mounted at the position second closest to the engine.
P1012
Intake camshaft position system
P1021
Oil feeder control valve system
P1603*
Battery back-up line system
Code No.
Diagnosis item
Reference page
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