Subaru 2009 IMPREZA Service Manual page 762

Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
X: DTC P0123 THROTTLE/PEDAL POSITION SENSOR/SWITCH "A" CIRCUIT
HIGH
1. OUTLINE OF DIAGNOSIS
Detect the open or short circuit of throttle position sensor 1.
Judge as NG if out of specification.
2. COMPONENT DESCRIPTION
(4)
(1) Throttle position sensor 1 signal
(2) Throttle position sensor 2 signal
3. ENABLE CONDITIONS
Secondary Parameters
Ignition switch
Battery voltage
4. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
5. DIAGNOSTIC METHOD
• Abnormality Judgement
If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.
Judgement Value
Malfunction Criteria
Sensor 1 input voltage
Time Needed for Diagnosis: 24 ms
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.
• Normality Judgement
Judge as OK and clear the NG if the continuous time while the following conditions are established is more
than the predetermined time.
Judgement Value
Malfunction Criteria
Sensor 1 input voltage
Time Needed for Diagnosis: 24 ms
(1)
(2)
(3) Throttle position sensor
Enable Condition
ON
6 V
Threshold Value
4.858 V
Threshold Value
< 4.858 V
GD(H4SO)-38
(3)
(4) Engine control module (ECM)
EN-01859