MPI <6A1> -
Troubleshooting
13A-98
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
Air flow sensor 1. Uses the throttle position sensor signal and engine speed signal (crank angle sensor
signal) to take reading of the basic injector drive time and basic ignition timing from
the pre-set mapping.
2. Fixes the ISC servo in the appointed position so idle control is not performed.
Intake air temperature
sensor
Controls as if the intake air temperature is 25
_
C.
Throttle position sen-
sor (TPS)
No increase in fuel injection amount during acceleration due to the throttle position sensor
signal.
Engine coolant tem-
perature sensor
Controls as if the engine coolant temperature is 80
_
C.
Top dead centre sen-
sor
Injects fuel to all cylinders simultaneously.
(However, after the ignition switch is turned to ON, the No. 1 cylinder top dead centre is not
detected at all.)
Barometric pressure
sensor
Controls as if the barometric pressure is 101 kPa.
Detonation sensor Switches the ignition timing from ignition timing for super petrol to ignition timing for standard
petrol.
Right bank oxygen
sensor (front) and left
bank oxygen sensor
(front)
Air/fuel ratio feedback control (closed loop control) is not performed.
Right bank oxygen
sensor (rear) and left
bank oxygen sensor
(rear)
Performs the feedback control (closed loop control) of the air/fuel ratio by using only the
signal of the oxygen sensor (front) installed on the front of the catalytic converter.
Communication wire
with transmission con-
Ignition timing is not retarded during transmission gear shifting (overall engine and
transmission control).
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.
NOTE
When a problem is detected in the vacuum control solenoid valve, ventilation control solenoid valve,
crank angle sensor or any of the above items, traction control is not performed <Vehicles with TCL>.
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