Mitsubishi Montero (2002-2004). Manual — part 566
FAIL-SAFE FUNCTION REFERENCE TABLE
TSB Revision
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
13Ab-21
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.
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.
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.
MALFUNCTION ITEM
CONTROL CONTENTS DURING MALFUNCTION
DIAGNOSTIC TROUBLE CODE CHART
TSB Revision
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
13Ab-22
DIAGNOSTIC TROUBLE CODE CHART
M1131151000367
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
DTC NO.
DIAGNOSTIC ITEM
REFERENCE
PAGE
P0101*
Volume airflow circuit range/performance problem
P0102*
Volume airflow circuit low input
P0106*
Barometric pressure circuit range/performance problem
P0107*
Barometric pressure circuit low input
P0108*
Barometric 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)
DIAGNOSTIC TROUBLE CODE CHART
TSB Revision
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
13Ab-23
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)
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
DTC NO.
DIAGNOSTIC ITEM
REFERENCE
PAGE
DIAGNOSTIC TROUBLE CODE CHART
TSB Revision
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
13Ab-24
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
P0403
Exhaust gas recirculation control circuit
P0421
Warm up catalyst efficiency below threshold (bank 1)
P0431
Warm up catalyst efficiency below threshold (bank 2)
P0441
Evaporative emission system incorrect purge flow
P0442
Evaporative emission system leak detected (Small leak)
P0443
Evaporative emission system purge control valve circuit
P0446
Evaporative emission system vent control
P0451
Evaporative emission system pressure sensor range/performance
P0452
Evaporative emission system pressure sensor low input
P0453
Evaporative emission system pressure sensor high input
P0455
Evaporative emission system leak detected (Gross leak)
P0456
Evaporative emission system leak detected (Very small leak)
P0461
Fuel level sensor circuit range/performance
P0500
Vehicle speed sensor
malfunction
• A/T DTC No. 29 (Vehicle speed sensor
system: Short circuit/open circuit
P0513
Immobilizer malfunction
P0551
Power steering pressure sensor circuit range/performance
P0554
Power steering pressure sensor circuit intermittent
P0606*
Powertrain control module main processor malfunction
P0638*
Throttle actuator control motor circuit range/ performance problem
P0642*
Throttle position sensor power supply
P0657*
Throttle actuator control motor relay circuit malfunction
P0660
Intake manifold tuning circuit malfunction
P0705
Transmission range
switch circuit malfunction
(PRNDL input)
• A/T DTC No. 27 (Transmission range switch
system: Open circuit)
• A/T DTC No. 28 (Transmission range switch
system: Short circuit)
P0712
Transmission fluid
temperature sensor low
input
• A/T DTC No. 16 (Transmission fluid
temperature sensor system: Short circuit)
P0713
Transmission fluid
temperature sensor high
input
• A/T DTC No. 15 (Transmission fluid
temperature sensor system: Open circuit)
DTC NO.
DIAGNOSTIC ITEM
REFERENCE
PAGE
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