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2004 ENGINE PERFORMANCE Engine Controls Diagnosis (DTC P0068 To DTC P0141/P0161) - 4.8L, 5.3L, and 6.0L - Hummer H2 ENGINE CONTROLS DIAGNOSIS (DTC P0068 TO DTC P0141/P0161) DTC P0068 Circuit Description The powertrain control module (PCM) uses the following readings to calculate the predicted mass air flow z The throttle position (TP) z The barometric pressure (BARO) z The intake air temperature (IAT) z The engine RPM The PCM compares the predicted MAF value to the actual MAF value, and to the speed density calculation, in Conditions for Running the DTC z DTCs P0601, P0602, P0604, P0606, P1516, P2101, P2108, U0107 are not set. z DTCs P0120 and P0220 are not active at the same time. or z The engine operates longer than 1 second. z The engine speed is more than 500 RPM. Conditions for Setting the DTC z The PCM detects that the difference between the actual air flow and the speed density calculated air flow z The above condition is met for less than 1 second. Action Taken When the DTC Sets z The control module illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails. z The control module records the operating conditions at the time the diagnostic fails. The control module z The control module commands the TAC system to operate in the Reduced Engine Power mode.
2004 Hummer H2 2004 ENGINE PERFORMANCE Engine Controls Diagnosis (DTC P0068 To DTC P0141/P0161) - 4.8L, 5.3L, and 6.0L - Hummer H2
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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