DTC P2228: Barometric Pressure Circuit Low Input

TECHNICAL DESCRIPTION

• The barometric pressure sensor outputs a voltage which corresponds to the barometric pressure.
  

• The ECM checks whether this voltage is within a specified range.
  

DESCRIPTIONS OF MONITOR METHODS

Barometric pressure sensor output voltage is out of reasonable barometric pressure range.

MONITOR EXECUTION

Continuous

MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)

• Not applicable
  

• Not applicable
  

DTC SET CONDITIONS

• More than 2 seconds have passed since the engine starting sequence was completed.
  
• Battery positive voltage is more than 8 volts.
  

• Barometric pressure sensor output signal is less than 49 kPa (14.5 in.Hg) (approximately 15,000 ft above sea level) for 10 seconds.
  

FAIL-SAFE AND BACKUP FUNCTION

• Control as if the barometric pressure is 101 kPa (29.8 in.Hg).
  

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 23 .

TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)

• ECM failed.
  

caution To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. (1)Connect scan tool MB991958 to the data link connector. (2)Turn the ignition switch to the "ON" position. (3)Carry out the test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 23 . (4)Check the diagnostic trouble code (DTC). Q. Is DTC P2228 set? Replace the ECM. When the ECM is replaced, register the ID code. Refer to GROUP 42B, Diagnosis - ID Code Registration Necessity Judgment Table <Vehicles with KOS> or GROUP 42C, Diagnosis - ID Codes Registration Judgment Table <Vehicles with WCM> . It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions .