HOLDEN GEN III V8, Service Training

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GEN III V8 ENGINE MANAGEMENT
A failure in the Mass Air Flow sensor or circuit will set one of the following DTCs:
DTC P0101 Mass Air Flow System Performance
Conditions for running the DTC P0101
• DTCsPO-102, P0103, P0107, P0108, P 0 1 2 1 , P0122, P0123 are not set
• The engine is running
• The throttle position angle is less than 50% and the engine vacuum (BARO-MAP) is greater than 65 kPa
• The system voltage is greater than 1 1 volts but less than 1 6 volts
• The change in throttle position is less than 3%
• All above conditions stable for two seconds
Conditions for setting DTC P0101
• The MAF frequency is 50% different from the speed density calculation
• All conditions met for at least five seconds
Action taken when DTC P0101 Sets
• The PCM illuminates the Check Powertrain Lamp when the diagnostic runs and fails
• The PCM records the operating conditions at the time the diagnostic fails The PCM stores this information
in the Freeze Frame/Failure Records
• The PCM utilises speed density (RPM, MAP, IAT) for fuel management
Conditions for clearing the Check Powertrain Lamp and DTC P0101
• The PCM turns the Check Powertrain Lamp OFF when the diagnostic runs and does not fail
• A last test failed (current DTC) clears when the diagnostic runs and does not fail
DTC P0102 Mass Air Flow Sensor Circuit Low Frequency
Conditions for running DTC P0102
• The engine speed is greater 300 RPM
• The system voltage is at least 1 1 0 volts
Conditions for setting DTC P0102
• The MAF frequency is less than 1 0 Hz
• All conditions met for at least one second
Action taken when DTC P0102Sets
• The PCM illuminates the Check Powertrain Lamp when the diagnostic runs and fails
• The PCM utilises speed density (RPM, MAP, IAT) for fuel management
• The PCM records the operating conditions at the time the diagnostic fails The PCM stores this information
in the Freeze Frame/Failure Records
Conditions for clearing the Check Powertrain Lamp and DTC P0102
• The PCM turns the Check Powertrain Lamp OFF when the diagnostic runs and does not fail
• A last test failed (current DTC) clears when the diagnostic runs and does not fail
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