TECHNICAL DESCRIPTION
Compare the actual measurement of volumetric efficiency by a mass airflow sensor signal with the volumetric efficiency estimated from a throttle position sensor (main) signal.
MONITOR EXECUTION
Continuous.
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)
Other Monitor (There is no temporary DTC set in memory for the item monitored below)
Sensor (The sensor below is determined to be normal)
DTC SET CONDITIONS
Check Conditions
- The difference between the actual volumetric efficiency and the volumetric efficiency estimated by the throttle position sensor (main) is higher than 0 percent. Or, the volumetric efficiency is 60 percent or lower.
- Engine speed is 750 r/min or higher.
Judgment Criteria
- For 0.4 second, the difference between the actual volumetric efficiency and the volumetric efficiency estimated by the throttle position sensor (main) is higher than 33 percent.
- For 0.4 second, the difference between the volumetric efficiency estimated by the throttle position sensor (main) and the volumetric efficiency estimated by the throttle position sensor (sub) is 8.8 percent or higher.
Check Conditions
- The difference between the actual manifold pressure and the manifold pressure estimated by the throttle position sensor (main) is more than 0 kPa (0 in.Hg). Or, the manifold pressure is 73 kPa (21.6 in.Hg) or less.
- Engine speed is 750 r/min or higher.
Judgment Criterion
- For 0.4 second, the difference between the actual manifold pressure and the manifold pressure estimated by the throttle position sensor (main) is more than 40 kPa (11.8 in.Hg).
- For 0.4 second, the difference between the manifold pressure estimated by the throttle position sensor (main) and the manifold pressure estimated by the throttle position sensor (sub) is 7 kPa (2.1 in.Hg) or more.
FAIL-SAFE AND BACKUP FUNCTION
- Throttle opening degree is restricted.
- Throttle opening degree position is in default position if throttle position sensor (sub) fails.
OBD-II DRIVE CYCLE PATTERN
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
- Throttle position sensor (main) system failed.
- Intake system vacuum leak.
- There is some foreign matter around mass airflow sensor.
- ECM failed.