Subaru Legacy IV (2008 year). Service manual - part 436
GD(H4DOTC)-194
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
DN:DTC P2012 INTAKE MANIFOLD RUNNER CONTROL CIRCUIT LOW (BANK 2)
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
3. ENABLE CONDITION
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 just before the tumble generator valve out-
put is set to ON
o OFF, and judge overcurrent NG when the overcurrent NG signal is sent 96 ms × 10 time(s)
in a row.
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.
Time Needed for Diagnosis: Less than 1 second
(1)
Engine control module (ECM)
(2)
Tumble generator valve
(3)
Battery
Secondary Parameters
Enable Conditions
Battery voltage
t 10.9 V
Judgement Value
Malfunction Criteria
Threshold Value
Open NG signal input
High
Overcurrent NG signal input
Low
Judgement Value
Malfunction Criteria
Threshold Value
Open NG signal input
High
Overcurrent NG signal input
High
EN-01789
E
E
(3)
M
(2)
(1)