Mitsubishi Galant 9G. Manual — part 933
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-32
FAIL-SAFE FUNCTION REFERENCE TABLE
M1131153000631
When the main sensor malfunctions are detected by
the diagnostic test mode, the vehicle is controlled by
means of the following defaults.
MALFUNCTION ITEM
CONTROL CONTENTS DURING MALFUNCTION
Mass airflow sensor
• Uses the throttle position sensor signal and engine speed signal (crankshaft
position sensor signal) for basic injector drive time and basic ignition timing
from the pre-set mapping.
Intake air temperature
sensor
Controls as if the intake air temperature is 25
°C (77°F).
Engine coolant
temperature sensor
Controls as if the engine coolant temperature is 80
°C (176°F). (This control will
be continued until the ignition switch is turned to "LOCK" (OFF) position even
though the sensor signal returns to normal.)
Camshaft position sensor Injects fuel simultaneously into all cylinders. (After the ignition switch is turned to
"ON" position, the No.1 cylinder top dead center is not detected at all.)
Barometric pressure
sensor
Controls as if the barometric pressure is 101 kPa (30 in.Hg).
Knock sensor
Switches the ignition timing from ignition timing for high octane to ignition timing
for standard octane fuel.
Heated oxygen sensor
<front>
Air/fuel ratio closed loop control is not performed.
Heated oxygen sensor
<rear>
Performs the closed loop control of the air/fuel ratio by using only the signal of
the heated oxygen sensor (front) installed on the front side of the catalytic
converter.
Generator FR terminal
No generator output suppression control is performed for the electrical load (to
be operated as an ordinary generator).
Misfire detection
The PCM stops supplying fuel to the cylinder with the highest misfiring rate if a
misfiring that could damage the catalytic converter is detected.
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.
• Prohibits the operation of the auto-cruise control.
• Cuts off fuel when the engine speed exceeds 3,000 r/min.
• Suppresses the engine output by stopping the electronically 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.
• Prohibits the operation of the auto-cruise control.
• Cuts off fuel when the engine speed exceeds 3,000 r/min.
• Suppresses the engine output by stopping the electronically controlled
throttle valve system if the accelerator pedal position sensor (main) is also
malfunctioning.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-33
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.
• Prohibits the operation of the auto-cruise control.
• Cuts off fuel when the engine speed exceeds 3,000 r/min.
• Suppresses the engine output by stopping the electronically 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.
• Prohibits the operation of the auto-cruise control.
• Cuts off fuel when the engine speed exceeds 3,000 r/min.
• Prohibits the idle speed control from learning.
• Suppresses the engine output by stopping the electronically controlled
throttle valve system if the throttle position sensor (main) is also
malfunctioning.
Throttle valve position
feedback
• Suppresses the engine output by stopping the electronically controlled
throttle valve system.
• Prohibits the operation of the auto-cruise control.
• Prohibits the operation of the engine speed feedback control.
Throttle actuator control
motor
• Suppresses the engine output by stopping the electronically controlled
throttle valve system.
• Prohibits the operation of the auto-cruise control.
• Prohibits the operation of the engine speed feedback control.
Throttle actuator control
computer
• Suppresses the engine output by stopping the electronically controlled
throttle valve system.
• Prohibits the operation of the auto-cruise control.
• Prohibits the operation of the engine speed feedback control.
Communication between
throttle actuator control
computer and engine
control computer
• Renders the amount of accelerator pedal travel as being approximately
one-half the normal opening angle.
• Prohibits the operation of the auto-cruise control.
• Prohibits the operation of the engine speed feedback control.
• Cuts off fuel when the engine speed exceeds 3,000 r/min.
MALFUNCTION ITEM
CONTROL CONTENTS DURING MALFUNCTION
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-34
DIAGNOSTIC TROUBLE CODE CHART
M1131151001490
CAUTION
During diagnosis, a DTC code associated with
other system may be set when the ignition switch
is turned on with connector(s) disconnected. On
completion, confirm all systems for DTC(s). If
DTC(s) are set, erase them all.
DTC
DIAGNOSTIC ITEM
REFERENCE
PAGE
P0069
Abnormal correlation between manifold absolute pressure sensor and
barometric pressure sensor
P0101*
Mass airflow circuit range/performance problem
P0102*
Mass airflow circuit low input
P0103*
Mass airflow circuit high input
P0106
Manifold absolute pressure circuit range/performance problem
P0107
Manifold absolute pressure circuit low input
P0108
Manifold absolute pressure circuit high input
P0111*
Intake air temperature circuit range/performance problem
P0112*
Intake air temperature circuit low input
P0113*
Intake air temperature circuit high input
P0116*
Engine coolant temperature circuit range/performance problem
P0117*
Engine coolant temperature circuit low input
P0118*
Engine coolant temperature circuit high input
P0122*
Throttle position sensor (main) circuit low input
P0123*
Throttle position sensor (main) circuit high input
P0125*
Insufficient coolant temperature for closed loop fuel control
P0128
Coolant thermostat (coolant temperature below thermostat regulating
temperature)
P0130
Heated oxygen sensor circuit (bank 1 sensor 1)
P0131
Heated oxygen sensor circuit low voltage (bank 1 sensor 1)
P0132
Heated oxygen sensor circuit high voltage (bank 1 sensor 1)
P0133
Heated oxygen sensor circuit slow response (bank 1 sensor 1)
P0134*
Heated oxygen sensor circuit no activity detected (bank 1 sensor 1)
P0135
Heated oxygen sensor heater circuit (bank 1 sensor 1)
P0136
Heated oxygen sensor circuit (bank 1 sensor 2)
P0137
Heated oxygen sensor circuit low voltage (bank 1 sensor 2)
P0138
Heated oxygen sensor circuit high voltage (bank 1 sensor 2)
P0139
Heated oxygen sensor circuit slow response (bank 1 sensor 2)
P0141
Heated oxygen sensor heater circuit (bank 1 sensor 2)
P0150
Heated oxygen sensor circuit (bank 2 sensor 1)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-35
P0151
Heated oxygen sensor circuit low voltage (bank 2 sensor 1)
P0152
Heated oxygen sensor circuit high voltage (bank 2 sensor 1)
P0153
Heated oxygen sensor circuit slow response (bank 2 sensor 1)
P0154*
Heated oxygen sensor circuit no activity detected (bank 2 sensor 1)
P0155
Heated oxygen sensor heater circuit (bank 2 sensor 1)
P0156
Heated oxygen sensor circuit (bank 2 sensor 2)
P0157
Heated oxygen sensor circuit low voltage (bank 2 sensor 2)
P0158
Heated oxygen sensor circuit high voltage (bank 2 sensor 2)
P0159
Heated oxygen sensor circuit slow response (bank 2 sensor 2)
P0161
Heated oxygen sensor heater circuit (bank 2 sensor 2)
P0171
System too lean (bank 1)
P0172
System too rich (bank 1)
P0174
System too lean (bank 2)
P0175
System too rich (bank 2)
P0181
Fuel tank temperature sensor circuit range/performance
P0182
Fuel tank temperature sensor circuit low input
P0183
Fuel tank temperature sensor circuit high input
P0201
Injector circuit-cylinder 1
P0202
Injector circuit-cylinder 2
P0203
Injector circuit-cylinder 3
P0204
Injector circuit-cylinder 4
P0205
Injector circuit-cylinder 5
P0206
Injector circuit-cylinder 6
P0222*
Throttle position sensor (sub) circuit low input
P0223*
Throttle position sensor (sub) circuit high input
P0300
Random/multiple cylinder misfire detected
P0301
Cylinder 1 misfire detected
P0302
Cylinder 2 misfire detected
P0303
Cylinder 3 misfire detected
P0304
Cylinder 4 misfire detected
P0305
Cylinder 5 misfire detected
P0306
Cylinder 6 misfire detected
P0325
Knock sensor circuit
P0335*
Crankshaft position sensor circuit
P0340*
Camshaft position sensor circuit
P0401
Exhaust gas recirculation flow insufficient detected
DTC
DIAGNOSTIC ITEM
REFERENCE
PAGE
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