PCM/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, PCM/ECM determines that a fault exists and a DTC is stored.
Item | Detecting Condition | Possible Cause | |
Case 1 | DTC Strategy |
•
Plausibility check | 1. Dirty air cleaner 2. Oil Cap or Dipstick missing or not installed correctly 3. Air leak in intake system 4. Contact resistance in connectors 5. Faulty MAPS or TPS |
Enable Conditions |
•
Pressure quotient (Manifold pressure / Ambient Pressure) < 0.8
•
Time after Start > 0.5 s
•
11 V≤ Battery voltage ≤ 16V
•
Signal change > 12˚/sec
•
Failure not detected for DTCs | ||
Threshold Value |
•
-60~-40% < Filtered Reduced Area controller < 40~60% versus Ambient Pressure, Throttle position | ||
Case 2 | DTC Strategy |
•
Plausibility check | |
Enable Conditions |
•
Pressure quotient (Manifold pressure / Ambient Pressure) < 0.8
•
Time after Start > 0.5 s
•
11 V≤ Battery voltage ≤ 16V
•
Signal change > 12˚/sec.
•
Failure not detected for DTCs | ||
Threshold Value |
•
-30 % ~ -20 % < Filtered Ambient pressure controller < +30 ~ +20 % (thd. versus ambient pressure value) | ||
Diagnostic Time |
•
5 sec. | ||
Mil On Condition |
•
2 Driving Cycles | ||
