Subaru 2009 IMPREZA Service Manual page 1782

Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
DJ:DTC P2009 INTAKE MANIFOLD RUNNER CONTROL CIRCUIT LOW (BANK 1)
1. OUTLINE OF DIAGNOSIS
Detect the open or short circuit of tumble generator valve motor.
Judge as NG when the overcurrent signal is sent from IC after tumble generator valve driving IC diagnosis.
2. COMPONENT DESCRIPTION
(1)
(1) Engine control module (ECM)
3. ENABLE CONDITIONS
Secondary Parameters
Battery voltage
4. GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.
5. DIAGNOSTIC METHOD
• Abnormality Judgement
At the main IC, check the sent signal at each timing which occurs immediately after the tumble generator
valve output is set to OFF
× 10 time(s) in a row.
Judgement Value
Malfunction Criteria
Overcurrent NG signal input
Time Needed for Diagnosis: 96 ms × 10 time(s)
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.
• Normality Judgement
Judge as OK and clear the NG when the OK signal is sent.
Judgement Value
Malfunction Criteria
Overcurrent NG signal input
Time Needed for Diagnosis: Less than 1 second
(2) Tumble generator valve
Enable Condition
10.9 V
ON, and judge overcurrent NG when the overcurrent NG signal is sent 96 ms
Threshold Value
Low
Threshold Value
High
GD(H4DOTC)-194
M
(2)
E
E
(3) Battery
(3)
EN-01789