Land Rover Workshop Manuals
LR3 (LA) V8-4394cc 4.4L (2005)
Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Air Flow Meter/Sensor > Component Information > Diagrams > Page 1474
Air Flow Meter/Sensor: Description and Operation
Mass Airflow Sensor
High or Low Input Failure and Ground Monitor
This monitor runs continuously. The voltage from the sensor is compared with failure thresholds that are defined in the software.
If the voltage is below the low threshold, then a timer will be incremented. If this timer exceeds a threshold, then a failure flag is set and a DTC is stored.
If the voltage is over the high threshold, then a timer will be incremented. If this timer exceeds a threshold, then a failure flag is set and a DTC is stored.
For MAF sensor short to ground or open circuit monitoring, then the voltage on the ground pin of the MAF sensor is monitored in the same way as
Range / Performance Failure
The monitor runs continuously so long as the entry conditions are met. The MAF sensor monitor compares the measured airflow with an estimated
Judgements of whether the MAF sensor is behaving correctly are made after the entry conditions have been fulfilled and the differences between the
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