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