Mitsubishi Colt Ralliart. Manual — part 16
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4A9>
13A-18
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
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
(main)
• Controls the throttle valve position through the use of the throttle position sensor
(sub) signal.
• Renders the amount of accelerator pedal travel as being approximately one-half
the normal opening angle.
• Prohibits the operation of the engine speed feedback control.
• Cuts off fuel when the engine speed exceeds 3,000 r/min.
• Suppresses the engine output by stopping the electronic-controlled throttle
valve system if the throttle position sensor (sub) is also malfunctioning.
Throttle position sensor
(sub)
• Controls the throttle valve position through the use of the throttle position sensor
(main) signal.
• Renders the amount of accelerator pedal travel as being approximately one-half
the normal opening angle.
• Cuts off fuel when the engine speed exceeds 3,000 r/min.
• Suppresses the engine output by stopping the electronic-controlled throttle
valve system if the throttle position sensor (main) is also malfunctioning.
Accelerator pedal
position sensor (main)
• Detects the amount of the accelerator pedal travel through the use of the
accelerator pedal position sensor (sub) signal, but rendering it only as being
approximately one-half the normal opening angle.
• Cuts off fuel when the engine speed exceeds 3,000 r/min.
• Suppresses the engine output by stopping the electronic-controlled throttle
valve system if the accelerator pedal position sensor (sub) is also
malfunctioning.
Accelerator pedal
position sensor (sub)
• Detects the amount of the accelerator pedal travel through the use of the
accelerator pedal position sensor (main) signal, but rendering it only as being
approximately one-half the normal opening angle.
• Cuts off fuel when the engine speed exceeds 3,000 r/min.
• Suppresses the engine output by stopping the electronic-controlled throttle
valve system if the accelerator pedal position sensor (main) is also
malfunctioning.
Engine coolant
temperature sensor
Controls as if the engine coolant temperature is 80
°C. (This control will be
continued until the ignition switch is turned to the "LOCK" (OFF) position even
though the sensor signal returns to normal.)
Camshaft position
sensor
Injects fuel into the cylinders in the order 1-3-4-2 with irregular timing. (After the
ignition switch is turned to the "ON" position, the No. 1 cylinder top dead center is
not detected at all.)
Oxygen sensor <front> Air/fuel ratio closed loop control is not performed.
Oxygen sensor <rear> Performs the closed loop control of the air/fuel ratio by using only the signal of the
oxygen sensor (front) installed on the front side of the catalytic converter.
Detonation sensor
The ignition timing is set having enough time against knocking.
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4A9>
13A-19
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.
Throttle valve position
feedback
• Suppresses the engine output by stopping the electronic-controlled throttle
valve system.
• Prohibits the operation of the engine speed feedback control.
Throttle valve control
servo
• Suppresses the engine output by stopping the electronic-controlled throttle
valve system.
• Prohibits the operation of the engine speed feedback control.
Engine-ECU <M/T> or
engine-CVT-ECU
<CVT> main processor
• Suppresses the engine output by stopping the electronic-controlled throttle
valve system.
• Prohibits the operation of the engine speed feedback control.
Communication
between powertrain
control module main
processor and system
LSI
• Renders the amount of accelerator pedal travel as being approximately one-half
the normal opening angle.
• Prohibits the operation of the engine speed feedback control.
• Cuts off fuel when the engine speed exceeds 3,000 r/min.
Malfunctioning item
Control contents during malfunction
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4A9>
13A-20
INSPECTION CHART FOR DIAGNOSIS CODE
M1131151002415
CAUTION
If the ignition switch is turned to the "ON" position with a connector or other electrical connections
disconnected during troubleshooting of a system, a diagnosis code may be set for other systems.
After finishing troubleshooting, check diagnosis codes for all systems, and if any codes have been
set, erase these codes.
Code No.
Diagnosis item
Reference page
P0011
Variable valve timing system
P0105
Manifold absolute pressure sensor system
P0110
Intake air temperature sensor system
P0115
Engine coolant temperature sensor system
P0122*
Throttle position sensor (main) circuit low input
P0123*
Throttle position sensor (main) circuit high input
P0125*
Feedback system monitor
P0130
Oxygen sensor (front) system
P0135
Oxygen sensor (front) heater system
P0136
Oxygen sensor (rear) system
P0141
Oxygen sensor (rear) heater 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
P0222*
Throttle position sensor (sub) circuit low input
P0223*
Throttle position sensor (sub) circuit high input
P0300*
Random/multiple 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
P0325
Detonation sensor system
P0335
Crank angle sensor system
P0340
Camshaft position sensor system
P0403
Exhaust gas recirculation control system <CVT>
P0421
Warm up catalyst malfunction
P0443
Purge control solenoid valve system
P0500
Vehicle speed signal system <M/T>
P0513
Immobilizer malfunction
P0603
EEP ROM malfunction
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4A9>
13A-21
NOTE:
.
•
Do not replace the engine-ECU <M/T> or engine-CVT-ECU <CVT> until a through terminal check reveals
there are no short/open circuit.
•
Check that the engine-ECU <M/T> or engine-CVT-ECU <CVT> earth circuit is normal before checking for
the cause of the problem.
•
After engine-ECU <M/T> or engine-CVT-ECU <CVT> 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.
P0606
Microcomputer malfunction
P0622
Alternator FR terminal system
P0638*
Throttle valve control servo circuit range/performance problem
P0642*
Throttle position sensor power supply
P0657*
Throttle valve control servo relay circuit malfunction
P1021
Oil feeder control valve system
P1602*
Communication malfunction (between engine-ECU <M/T> or
engine-CVT-ECU <CVT> main processor and system LSI)
P1603*
Battery backup circuit malfunction
P2100*
Throttle valve control servo circuit (open)
P2101*
Throttle valve control servo magneto malfunction
P2108*
Throttle valve control servo processor malfunction
P2122*
Accelerator pedal position sensor (main) circuit low input
P2123*
Accelerator pedal position sensor (main) circuit high input
P2127*
Accelerator pedal position sensor (sub) circuit low input
P2128*
Accelerator pedal position sensor (sub) circuit high input
P2135*
Throttle position sensor (main and sub) range/performance problem
P2138*
Accelerator pedal position sensor (main and sub) range/performance
problem
P2226
Barometric pressure sensor system
U1073
Bus off
U1102
ABS-ECU time-out
U1106
EPS
−ECU time-out
U1108
Combination meter time-out
U1110
A/C-ECU time-out
Code No.
Diagnosis item
Reference page
Main
Index
Group
TOC
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