Mitsubishi FUEL Manual page 250

13I-56
Code No. P1220 Electronic-controlled throttle valve
system
Range of Check
D Ignition switch: ON
D Error in communication between the engine-ECU <M/T> or engine-A/T-ECU
<A/T> and the throttle valve controller
Set Conditions
D Output voltage of throttle position sensor (2nd channel) fluctuates significantly
(approx. 1 V or more) from an expected value, based on that of the
accelerator pedal position sensor (2nd channel).
Range of Check
D Ignition switch: ON
D Error in communication between the throttle valve controller and the
engine-ECU <M/T> or engine-A/T-ECU <A/T>
Set Conditions
D The output voltage of the throttle position sensor (2nd channel) is significantly
different (approx. 1 V) from the throttle valve opening angle (voltage), which
the engine-ECU <M/T> or engine-A/T-ECU <A/T> request the throttle valve
controller.
Check the following connectors: C-160, C-163 <M/T>,
C-177 <A/T>
Check the harness wire between the throttle valve controller
and the engine-ECU <M/T> or engine-A/T-ECU <A/T>.
Check the trouble symptoms.
Replace the throttle valve controller.
Check the trouble symptoms.
Replace the engine-ECU <M/T> or engine-A/T-ECU <A/T>.
GDI -
OK
OK
NG
NG
Troubleshooting
Probable cause
D Short in communication line
D Malfunction of the engine-ECU <M/T>
D Malfunction of the engine-A/T-ECU <A/T>
D Malfunction of the throttle valve controller
NG
Repair
NG
Repair