DTC P2227: Barometric Pressure Circuit Range/Performance Problem

CIRCUIT OPERATION
• A 5-volt voltage is supplied to the barometric pressure sensor power terminal (terminal No. 1) from the PCM (terminal No. 46). The ground terminal (terminal No. 5) is grounded with PCM (terminal No. 57).
• A voltage that is proportional to the atmospheric pressure is sent to the PCM (terminal No. 55) from the barometric pressure sensor output terminal (terminal No. 2).
TECHNICAL DESCRIPTION
• The barometric pressure sensor outputs a voltage which corresponds to the barometric pressure.
• The PCM checks whether this voltage is within a specified range.
DESCRIPTIONS OF MONITOR METHODS
Barometric pressure sensor output voltage does not change for specified period. (approximately 1 week)
MONITOR EXECUTION
Continuous
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)

Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
• Not applicable

Sensor (The sensor below is determined to be normal)
• Not applicable
DTC SET CONDITIONS Logic Flow Chart


Check Conditions
Barometric pressure is lower than 76 kPa (22.4 in.Hg).

Judgement Criteria
• During 15 times of driving, the changes in the sensor output voltage should measure 0.015 volt [equivalent to 0.4 kPa (0.12 in.Hg)] or less.
• Make sure that the engine coolant temperature is 72°C (162°F) or higher during each of the 15 times of driving. Also, during each of the 15 times of driving, make sure that after the engine has been started, the engine coolant temperature has increased for 23°C (73°F) or higher.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function - OBD-II Drive Cycle - Procedure 6 - Other Monitor .
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:
• Barometric pressure sensor failed.
• Harness damage in barometric pressure sensor circuit, or connector damage.
• PCM failed.