DTC P1088: Tumble Generated Valve Position Sensor 1 Circuit Low

OUTLINE OF DIAGNOSIS
Detect open or short circuit of tumble generated valve position sensor. Judge NG when the value is out of standard range.
COMPONENT DESCRIPTION

Fig 1: Identifying Tumble Generated Valve Angle (1 Of 2)
Courtesy of SUBARU OF AMERICA, INC.

ENABLE CONDITION

ENABLE CONDITION CHART

Secondary Parameters	Enable Conditions
None

GENERAL DRIVING CYCLE
Always perform diagnosis.

DIAGNOSTIC METHOD

Judge NG when the continuous time of completing the malfunction criteria below becomes more than the time needed for diagnosis (0.5 seconds). Judge OK and clear NG when the malfunction criteria below are not completed.

Judgment Value

JUDGMENT VALUE CHART

Malfunction Criteria	Threshold Value
Output voltage	< 0.167 V

Time Needed for Diagnosis: 0.5 seconds

Malfunction Indicator Light Illumination: Illuminates as soon as malfunction occurs.

DTC CLEAR CONDITION
- When the OK idling cycle was completed 40 times in a row
- When "Clear Memory" was performed
MALFUNCTION INDICATOR LIGHT CLEAR CONDITION
- When the OK driving cycle was completed 3 times in a row
- When "Clear Memory" was performed
FAIL SAFE
Tumble generated valve position
- Learning of tumble generated valve position fully closed and date not renewed to close side.
- Learning of tumble generated valve position fully opened and date not renewed to open side.
ECM OPERATION AT DTC SETTING
Memorize the freeze frame data. (For test mode $02)