DTC P1110: Atmospheric Pressure Sensor Circuit Malfunction (Low Input)

OUTLINE OF DIAGNOSIS
- Detect the open/short circuit of atmospheric pressure sensor.
- Judge NG when out of the standard value.
COMPONENT DESCRIPTION
Atmospheric pressure sensor is built in ECM.

ENABLE CONDITION

Secondary Parameters	Enable Conditions
Engine speed	"GREATER THAN EQUAL TO" 00 rpm
Battery voltage	"GREATER THAN EQUAL TO" 10 V
Timer after starting the engine	"GREATER THAN EQUAL TO" 2 seconds
Ignition switch	ON

GENERAL DRIVING CYCLE
Perform the diagnosis continuously in 2 seconds after starting the engine.

DIAGNOSTIC METHOD

Judge NG when the continuous time until completing the malfunction criteria below becomes more than the time (2.5 seconds) needed for diagnosis. Judge fail safe NG when the continuous time until completing the malfunction criteria below becomes more than the time (0.1 seconds) needed for diagnosis. Judge OK and clear the NG when the malfunction criteria below are not completed.

Judgment Value

JUDGMENT VALUE

Malfunction Criteria	Threshold Value
Output voltage	"GREATER THAN EQUAL TO" .1 V

Time Needed for Diagnosis: 2.5 seconds

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

DTC CLEAR CONDITION
- When the OK idling cycle is completed 40 times in a row
- When "Clear Memory" was performed
MALFUNCTION INDICATOR LIGHT CLEAR CONDITION
- When the OK driving cycle is completed 3 times in a row
- When "Clear Memory" was performed
FAIL SAFE
Make the atmospheric pressure 101 kPa (760 mmHg, 30 inHg).
ECM OPERATION AT DTC SETTING
Memorize the freeze frame data. (For test mode $02)