Mitsubishi Lancer Evolution 7. Manual — part 178
MPI -
Troubleshooting
MPI -
Troubleshooting
13A-11
CONFIRMING FREEZE FRAME DATA
When the engine-ECU detects a malfunction and stores a diagnosis code, it also stores a current status
of the engine. This function is called “Freeze frame” data. By analyzing this “Freeze frame” data with
MUT-II, an effective troubleshooting can be performed.
NOTE
If mulfunctions have been detected in multiple systems, engine-ECU stores one malfunction only, which
has been detected first.
Item No.
Data item
Unit/State
Item No.
Data item
Unit/State
21
Engine coolant temperature
sensor
_
C
81
Learn value
%
22
Crank angle sensor
r/min
82
Feedback
%
24
Vehicle speed
km/h
87
Engine load
%
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.
Throttle position
sensor
No increase in fuel injection amount during acceleration due to the throttle position sensor
signal.
Engine coolant
temperature sensor
1. Controls as if the engine coolant temperature is 80_C.
(Even after sensor signal is correctly recovered, continues until the ignition switch
is set to the “LOCK” (OFF) position.)
2. Rotates radiator fan and condenser fan at high speed.
Camshaft position
sensor
1. Inject all fuel cylinders simultaneously. (However, when the No.1 cylinder top dead
centre is not detected at all after the ignition switch is turned to “ON” position.)
2. Shuts off fuel supply after 4 seconds have passed since a failure was detected.
(However, when the No.1 cylinder top dead centre is not detected at all after the
ignition switch is turned to “ON” position.)
Barometric pressure
sensor
Controls as if the barometric pressure is 101 kPa.
Detonation sensor
Switches the ignition timing from ignition timing for super petrol to ignition timing for standard
petrol.
Alternator FR terminal
Does not control the output of the alternator according to an electrical load. (works as a
normal alternator)
MPI -
Troubleshooting
13A-12
INSPECTION CHART FOR DIAGNOSIS CODES
Code No.
Diagnosis item
Reference page
P0100
Air flow sensor system
13A-13
P0105
Barometric pressure sensor system
13A-15
P0110
Intake air temprature sensor system
13A-16
P0115
Engine coolant temperature sensor system
13A-19
P0120
Throttle position sensor system
13A-21
P0130
Oxygen sensor (front) system
13A-24
P0135
Oxygen sensor heater (front) system
13A-26
P0136
Oxygen sensor (rear) system
13A-27
P0141
Oxygen sensor heater (rear) system
13A-29
P0201
No.1 injector system
13A-30
P0202
No.2 injector system
13A-31
P0203
No.3 injector system
13A-32
P0204
No.4 injector system
13A-33
P0325
Detonation sensor system
13A-34
P0335
Crank angle sensor system
13A-35
P0340
Camshaft position sensor system
13A-37
P0403
EGR control solenoid valve system
13A-39
P0443
Purge control solenoid valve system
13A-41
P0500
Vehicle speed sensor system
13A-43
P0505
Idle speed control system
13A-44
P0551
Power steering fluid pressure switch system
13A-46
P1104
Waste gate solenoid valve system
13A-47
P1105
Fuel pressure control valve system
13A-48
P1500
Alternator FR terminal system
13A-49
P1603
Battery backup line malfunction
13A-50
P1610
Immobilizer system
13A-51
MPI -
Troubleshooting
13A-13
DIAGNOSTIC TROUBLE CODE INSPECTION PROCEDURE
Code No. P0100 Air flow sensor system
Probable cause
Inspection Range
D
Engine speed: More than 500 r/min
Evaluation Conditions
D
The sensor output frequency is less than 3 Hz for 4 seconds.
D
Air flow sensor malfunction
D
Air flow sensor circuit disconnection, short-circuit,
or connector contact defect
D
Engine-ECU malfunction
OK
Intermittent malfunction
(Refer to GROUP 00 - Points to Note
for Intermittent Malfunctions.)
OK
MUT-II Data list
D
No. 12 Air flow sensor
(Refer to P.13A-102.)
NG
Replace engine-ECU.
OK
To the next page
OK
Check the harness between the air
flow sensor and engine-ECU.
D
Check for ground wire
disconnection and damage.
NG
Repair
(3) NG
Check the following connector:
C-115
NG
Repair
OK
Check the harness between the air
flow sensor and engine control relay.
D
Check for power cable
disconnection and short-circuit.
(2) NG
Check the following connector:
B-11X
NG
OK
Intermittent malfunction
(Refer to GROUP 00 - Points to Note
for Intermittent Malfunctions.)
OK
MUT-II Data list
D
No. 12 Air flow sensor
(Refer to P.13A-102.)
NG
Replace engine-ECU.
OK
Check the harness between the air
flow sensor and engine-ECU.
D
Check for short-circuit of the
output wire.
NG
Repair
NG
Check the following connector:
C-115
NG
Repair
OK
Check and repair the harness between
the air flow sensor and engine-ECU.
D
Check for disconnection of the
output wire.
NG
Repair
OK
Measure at the B-31 air flow sensor
connector.
D
Disconnect the connector to
measure at the harness side
(1) Voltage between terminal No. 3
and earth
(Ignition switch: ON)
OK: 4.9 - 5.1 V
(2) Voltage between terminal No. 4
and earth
(Ignition switch: ON)
OK: System voltage
(3) Resistance between terminal No.
5 and earth
OK: Less than 2 Ω
(1) NG
Measure at the C-115 engine-ECU
connector.
D
Measure the voltage of the
engine-ECU terminal.
D
Ignition switch: ON
D
Voltage between terminal No. 90
and earth.
OK: 4.9 - 5.1 V
OK
Check the following connector:
C-115
NG
Check the following connector:
B-31
NG
Repair
MUT-II Data list
D
No. 12 Air flow sensor
(Refer to P.13A-102.)
OK
Intermittent malfunction
(Refer to GROUP 00 - Points to Note
for Intermittent Malfunctions.)
Repair
MPI -
Troubleshooting
13A-14
OK
Check the harness between the air
flow sensor and engine-ECU.
D
Check for damage of the output
wire.
D
Check for damage of the earth
wire.
NG
OK
Check the harness between the air
flow sensor and engine control relay.
D
Check for damage of the power
cable.
Repair
NG
NG
Check the following connectors:
B-11X, C-115
Repair
OK
Check the trouble symptom.
End
OK
Intermittent malfunction
(Refer to GROUP 00 - Points to Note
for Intermittent Malfunctions.)
OK
MUT-II Data list
D
No. 12 Air flow sensor
(Refer to P.13A-102.)
NG
Replace engine-ECU.
Replace the air flow sensor.
OK
Intermittent malfunction
(Refer to GROUP 00 - Points to Note
for Intermittent Malfunctions.)
OK
Measure the output waveform at the
B-31 air flow sensor connector (using
an analyzer).
D
Using the test harness
(MB991709), connect the
connector, and measure at the
pickup harness.
D
Engine: Idle
D
Voltage between terminal No. 3
and earth.
OK: Output the waveform as
shown on P.13A-112 (in-
spection procedure by ana-
lyzer), and check that there
is noise in the output wave-
form.
NG
OK
MUT-II Data list
D
No. 12 Air flow sensor
(Refer to P.13A-102.)
NG
Replace engine-ECU.
OK
Check the harness between air flow
sensor and engine-ECU.
D
Check for disconnection and
damage of the reset signal wire.
NG
Repair
OK
Measure at the B-31 air flow sensor
connector.
D
Using the test harness
(MB991709), connect the
connector, and measure at the
pickup harness.
D
Voltage between terminal No. 7
and earth.
OK: Engine: idle
0 - 1 V
Engine: 3,000 r/min
6 - 9 V
NG
Check the following connector:
C-126
NG
Repair
OK
Replace the air flow sensor.
OK
Check the harness between the air
flow sensor and engine-ECU.
D
Check for short-circuit of the
reset signal wire.
NG
Repair
OK
Measure at the B-31 air flow sensor
connector.
D
Using the test harness
(MB991709), connect the
connector, and measure at the
pickup.
D
Ignition switch: ON
D
Voltage between terminal No. 7
and earth.
OK: 7 - 8 V
NG
Check the following connector:
C-126
NG
Repair
From the previous page
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