Subaru 2009 IMPREZA, Service Manual

Page: 873 / 3619

GD(H4SO)-149
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
CC:DTC P0638 THROTTLE ACTUATOR CONTROL RANGE/PERFORMANCE
(BANK 1)
1. OUTLINE OF DIAGNOSIS
Judge as NG when the target opening angle and actual opening angle is mismatched or the current to motor
is the specified duty or more for specified time continuously.
2. COMPONENT DESCRIPTION
3. ENABLE CONDITIONS
4. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously when the electronic throttle control is operating.
5. DIAGNOSTIC METHOD
Judge as OK and clear the NG when the malfunction criteria below are met.
Time Needed for Diagnosis:
• Target opening angle and actual opening angle: 250 milliseconds (For NG) 2000 milliseconds (For OK)
• Output duty to drive circuit: 2000 milliseconds
(1) Motor (3) Engine control module (ECM) (4) Drive circuit
(2) Throttle position sensor
Secondary Parameters Enable Condition
Ignition switch ON
Normal operation of electronic throttle
control ON
Judgement Value
Malfunction Criteria Threshold Value
Difference between target opening angle
and actual opening angle 3.5° or less
Output duty to drive circuit 95% or less
EN-01863
(3)
(4)
(1)
(2)