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speeds and loads. A small quantity of air entering the engine indicates a deceleration or idle condition. A large z An ignition 1 voltage circuit z A ground circuit z A signal circuit The PCM applies a voltage to the sensor on the signal circuit. The sensor uses the voltage to produce a z The manifold absolute pressure (MAP) sensor z The intake air temperature (IAT) sensor z The engine coolant temperature (ECT) sensor z The engine speed in revolutions per minute (RPM) The PCM compares the actual MAF sensor frequency signal to the predicted MAF value. This comparison will Conditions for Running the DTC z DTCs P0102, P0103, P0106, P0107, P0108, P0120, P0220, P0442, P0443, P0446, P0449, P0455, P0496, z The engine is cranking or running. z The ignition 1 signal is between 11-18 volts. z The throttle position (TP) indicated angle is less than 95 percent. z The change in the TP indicated angle is less than 5 percent. z The MAP sensor is more than 17 kPa. z The change in the MAP sensor is less than 3 kPa. z The above conditions are met for 1.5 seconds. Conditions for Setting the DTC The PCM detects that the actual MAF sensor frequency signal is not within a predetermined range of the Action Taken When the DTC Sets z The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition
2004 Hummer H2 2004 ENGINE PERFORMANCE Engine Controls Diagnosis (DTC P0068 To DTC P0141/P0161) - 4.8L, 5.3L, and 6.0L - Hummer H2
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