GDI ± Troubleshooting
13A-13
Defective part or
function
What to do when a sensor is defective
Accelerator pedal
position sensor (1st
channel)
(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.
Accelerator pedal
position sensor (2nd
channel)
(1) Disables lean-mixture combustion.
(2) Controls the throttle valve position by using the accelerator pedal position sensor
(1st channel) signal.
(3) Disables the electronic-controlled throttle valve system if the accelerator pedal position
sensor (1st channel) signal is also defective.
Electronic-controlled
throttle valve system
(1) Disables the electronic-controlled throttle valve system.
(2) Disables lean-mixture combustion.
(3) Disables engine speed feedback control.
Throttle valve position
feedback
(1) Disables the electronic-controlled throttle valve system.
(2) Disables lean-mixture combustion.
(3) Disables engine speed feedback control.
However, if the throttle valve opening is great, controls as follows:
(1) Carries out lean-mixture combustion continuously.
(2) Shuts off fuel supply for 2 cylinders continuously.
(3) Shuts off fuel supply when engine speed exceeds 3,000 r/min.
Throttle valve control
servo motor (1st
motor) malfunction
Disables lean-mixture combustion.
Throttle valve control
servo motor (2nd
motor) malfunction
(1) Disables the electronic-controlled throttle valve system.
(2) Disables lean-mixture combustion.
(3) Disables engine speed feedback control.
Communication line
with the throttle valve
controller
(1) Error in communication from the throttle valve controller to engine-ECU
D Disables lean-mixture combustion.
D Shuts off fuel supply when engine speed exceeds 3,000 r/min.
(2) Error in communication from the engine-ECU to throttle valve controller
D Disables lean-mixture combustion.
D Shuts off fuel supply when engine speed exceeds 3,000 r/min.
D The throttle valve controller controls the throttle valve opening angle by using
the accelerator pedal position sensor (2nd channel) signal.
NOTE
When the electronic-controlled throttle valve system is stopped, the engine warning lamp flashes.
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