PCM 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 determines that a fault exists and a DTC is stored.
PCM compares the difference between MAPS output and calculated MAPS value while enable condition is met.
If the actual MAP value or lower than calculated(threshold) value for 2min failure during tip in - out driving, PCM 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 | ||
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.
