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)