2010 Cadillac Truck Escalade/ESV RWD V8-6.2L Page 2413
Typical Scan Tool Data
Circuit Description
The intake flow rationality diagnostic provides the within-range rationality check for the mass air flow (MAF), manifold absolute pressure (MAP),
and the throttle position (TP) sensors. This is an explicit model-based diagnostic containing 4 separate models for the intake system.
* The throttle model describes the flow through the throttle body and is used to estimate the MAF through the throttle body as a function of
barometric pressure (BARO), TP, intake air temperature (IAT), and estimated MAP. The information from this model is displayed on the
scan tool as the MAF Performance Test parameter.
* The first intake manifold model describes the intake manifold and is used to estimate MAP as a function of the MAF into the manifold from
the throttle body and the MAF out of the manifold caused by engine pumping. The flow into the manifold from the throttle uses the MAF
estimate calculated from the above throttle model. The information from this model is displayed on the scan tool as the MAP Performance
Test 1 parameter.
* The second intake manifold model is identical to the first intake manifold model except that the MAF sensor measurement is used instead of
the throttle model estimate for the throttle air input. The information from this model is displayed on the scan tool as the MAP Performance
Test 2 parameter.
* The fourth model is created from the combination and additional calculations of the throttle model and the first intake manifold model. The
information from this model is displayed on the scan tool as the TP Performance Test parameter.
The estimates of MAF and MAP obtained from this system of models and calculations are then compared to the actual measured values from the
MAF, MAP, and the TP sensors and to each other to determine the appropriate DTC to fail. The following table illustrates the possible failure
combinations and the resulting DTC or DTCs.
Conditions for Running the DTCs
* DTCs P0102, P0103, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0128, P0335, P0336 are not set.
* The engine speed is between 450-8,000 RPM.
* The IAT Sensor parameter is between -20 and +125掳C (-4 and +257掳F).
* The ECT Sensor parameter is between 70 and 125掳C (158 and 257掳F).
* This DTC runs continuously within the enabling conditions.
Conditions for Setting the DTC
The engine control module (ECM) detects that the actual measured airflow from the MAF, MAP, and TP sensors is not within range of the
