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Fail-safe Chart
=NFEC1425
The ECM enters fail-safe mode, if any of the following malfunctions is detected due to the open or short cir-
cuit. When the ECM enters the fail-safe mode, the MIL illuminates.
DTC No. Detected items Engine operating condition in fail-safe mode
P0102, P0103,
P1102
Mass air flow sensor circuit Engine speed will not rise more than 2,400 rpm due to the fuel cut.
P0117, P0118 Engine coolant temperature
sensor circuit
Engine coolant temperature will be determined by ECM based on the time after
turning ignition switch “ON” or “START”.
CONSULT-II displays the engine coolant temperature decided by ECM.
Condition
Engine coolant temperature decided
(CONSULT-II display)
Just as ignition switch is turned
ON or Start
40°C (104°F)
More than approx. 4 minutes
after ignition ON or Start
80°C (176°F)
Except as shown above
40 - 80°C (104 - 176°F)
(Depends on the time)
When the fail-safe system for engine coolant temperature sensor is activated, the
cooling fan operates while engine is running.
P0221, P0222,
P0223, P1223,
P1224
Throttle position sensor The ECM controls the electric throttle control actuator in regulating the throttle
opening in order for the idle position to be within +10 degrees.
The ECM regulates an opening speed of approx. 5 seconds to an opening of 10
degrees. So, the acceleration will be poor.
P0226, P0227,
P0228, P1227,
P1228
Accelerator pedal position
sensor
The ECM controls the electric throttle control actuator in regulating the throttle
opening in order for the idle position to be within +10 degrees.
The ECM regulates an opening speed of approx. 5 seconds to an opening of 10
degrees. So, the acceleration will be poor.
P1121 Electric throttle control
actuator
(ECM detect the throttle
valve is stuck open.)
While the vehicle is driving, it slows down gradually by fuel cut. After the vehicle
stops, the engine stalls.
The engine can restart in “N” or “P” position, and engine speed will not exceed
1,000 rpm or more.
P1122 Electric throttle control func-
tion
ECM stops the electric throttle control actuator control, throttle valve is maintained
at a fixed opening (approx. 5 degrees) by the return spring.
P1126 Throttle control relay ECM stops the electric throttle control actuator control, throttle valve is maintained
at a fixed opening (approx. 5 degrees) by the return spring.
P1129 Sensor power supply ECM stops the electric throttle control actuator control, throttle valve is maintained
at a fixed opening (approx. 5 degrees) by the return spring.
GI
MA
EM
LC
FE
CL
MT
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
TROUBLE DIAGNOSIS — GENERAL DESCRIPTION
Fail-safe Chart
EC-129
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