ECM compares the MAPS output and calculated MAPS value while enable condition is met. If the acutal MAP value is higher than Maximum threshold or lower than Minimum threshold for a pre-determined time, ECM determines that a fault exists and a DTC is stored.
Item
Detecting Condition
Possible Cause
Case 1
DTC Strategy
Circuit Range/Performance Problem (During acceleration)
Dirty air cleaner.
Oil Cap or Dipstick missing or not installed correctly.
Air leak in intake system
Contact resistance in connectors.
Faulty MAPS or TPS
Enable Conditions
Engine RPM > 1000 rpm
10 V= Battery voltage = 16V
Signal change > 12°/sec
Threshold Value
MAP(Model) > 0.9*ATM. But, MAP(Measured) < 0.6*ATM
Deviation value of fuel trim control > 20% or < -20%
Case 2
Circuit Range/Performance Problem
MAP(Model) - MAP(Measured) > 280 hPa
Diagnostic Time
It depends on the driving conditions.
Mil On Condition
2 Driving Cycles
As often as possible, the MAPS signal should be compared with the TPS signal. Check whether the MAPS and TPS signals increase at the same time when accelerating. During acceleration, the MAPS output voltage increases; during deceleration, the MAPS output voltage decreases.