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DIAGNOSTICS
ECD SYSTEM (1ND--TV)
05--73
COROLLA Supplement (RM1129E)
DTC
P0121
THROTTLE/PEDAL POSITION
SENSOR/SWITCH ”A” CIRCUIT
RANGE/PERFORMANCE PROBLEM
DTC
P0487
EXHAUST GAS RECIRCULATION
THROTTLE POSITION CONTROL CIRCUIT
DTC
P0488
EXHAUST GAS RECIRCULATION
THROTTLE POSITION CONTROL
RANGE/PERFORMANCE
CIRCUIT DESCRIPTION
The ECM opens and closes the intake shutter valve (throttle valve) using the rotary solenoid type actuator.
Upon opening and closing the valve, the exhaust gas recirculation volume is properly controlled. Also, en-
gine vibration and noise are reduced by closing the valve when the engine is stopped.
DTC No.
DTC Detection Condition
Trouble Area
P0121
Learning value of intake shutter is abnormal
(Determination of a malfunction is conducted within a given
time after the ignition switch is turned from ON to OFF. If a
malfunction is detected within this time, the MIL is illuminated
and a DTC is set when the ignition switch is next turned to ON)
S
Intake shutter stuck
S
Intake shutter does not move smoothly
S
Open or short in intake shutter circuit
S
Open or short in intake shutter position sensor circuit
S
Intake shutter position sensor (built in intake shutter valve)
S
ECM
P0487
Open or short in intake shutter circuit
(The MIL is illuminated as well as a DTC being set immediately
malfunction is detected)
S
Open or short in intake shutter circuit
S
ECM
P0488
Target and actual positions of intake shutter are different
(The MIL is illuminated as well as a DTC being set immediately
malfunction is detected)
S
Intake shutter stuck
S
Intake shutter does not move smoothly
S
Open or short in intake shutter circuit
S
Open or short in intake shutter position sensor circuit
S
Intake shutter position sensor (built in intake shutter valve)
S
ECM
HINT:
S
DTC P0121 is set when the ignition switch is turned from ON to OFF.
S
DTC P0487 is set when idling for more than 30 seconds after engine start.
S
DTC P0488 is set when engine idling.
05MRQ--01
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TOYOTA COROLLA REPAIR MANUAL SUPP 1129E