Mitsubishi MOTORS Space Runner 1999 Workshop Manual Supplement page 370

FAIL-SAFE FUNCTION REFERENCE TABLE
If the diagnosis system detects any sensor malfunction, the vehicle can be driven safely by using a default
control logic instead of the faulty sensors.
Defective part or
function
Air flow sensor
Intake air temperature
sensor
Throttle position
sensor (1st channel)
Throttle position
sensor (2nd channel)
Engine coolant
temperature sensor
Camshaft position
sensor
Vehicle speed sensor
Barometric pressure
sensor
Detonation sensor
Injector
Abnormal combustion
Alternator FR terminal
Fuel pressure sensor
Accelerator pedal
position sensor (1st
channel)
GDI –
What to do when a sensor is defective
(1) Disables lean-mixture combustion.
(2) Determines injector basic operating time and basic ignition timing according to map
value, which has been predetermined by throttle position sensor and crank angle
sensor signals.
Controls as the intake air temperature is 25 C.
(1) Disables lean-mixture combustion.
(2) Controls throttle valve opening angle by closed loop control by using the throttle position
sensor (2nd channel) signal.
(3) Disables the throttle valve opening angle control when the throttle position sensor
(2nd channel) signal is also defective.
(1) Disables lean-mixture combustion.
(2) Controls throttle valve opening angle by closed loop control by using the throttle position
sensor (1st channel) signal.
(3) Disables the throttle valve opening angle control when the throttle position sensor
(1st channel) signal is also defective.
Controls as if the engine coolant temperature is 80 C. (Note that this control will continue
until the ignition switch is turned off even if the sensor signal return to normal.)
Controls according to the conditions before a failure is detected.
(1) Disables lean-mixture combustion. However, if a predetermined time elapses at an
engine speed of 1,500 r/min or more, the lean-mixture combustion will return to normal.
(2) Disables lean-mixture combustion during engine idling.
Controls as if the barometric pressure is 101 kPa.
Holds the ignition timing at that for regular gasoline.
(1) Disables lean-mixture combustion.
(2) Shuts down exhaust gas recirculation.
Disables lean-mixture combustion.
Disables inhibition control of the alternator output according to electrical load (treats the
alternator as if it is conventional one).
(1) Controls as if the fuel pressure is 5 MPa (if there is open or short circuit).
(2) Turns off the fuel pump relay (if the fuel pressure is excessively high).
(3) Shuts off the fuel injection (If an excessively low pressure is detected or the engine
speed exceeds 3,000 r/min).
(1) Disables lean-mixture combustion.
(2) Controls the throttle valve position by using the accelerator pedal position sensor
(2nd channel) signal.
(3) Disables the electronic-controlled throttle valve system if the accelerator pedal position
sensor (2nd channel) signal is also defective, and holds the throttle valve at a
predetermined angle where the vehicle can be driven safely although its performance
is reduced.
Troubleshooting
13A-11