2010 Cadillac CTS Sedan AWD V6-3.6L Page 998
Circuit/System Description
The mass air flow (MAF) sensor is located in the air intake duct. The MAF sensor is an airflow meter that measures the amount of air that enters the
engine. The MAF sensor uses a hot film that is cooled by air flowing past the sensing film as air enters the engine. The amount of cooling is
proportional to the amount of the air flow. As the air flow increases, more current is required in order to maintain the hot film at a constant
temperature. The engine control module (ECM) uses the MAF sensor in order to provide the correct fuel delivery for all operating conditions. The
intake air temperature (IAT) sensor is integrated into the MAF sensor.
Conditions for Running the DTC
* Before the ECM can report DTC P0101 failed, DTCs P0010, P0011, P0013, P0014, P0020, P0021, P0023, P0024, P0100, P0102, P0103,
P0111, P0112, P0113, P0121, P0122, P0123, P0221, P0222, P0223, P0335, P0336, P0338, P2088, P2089, P2090, P2091, P2092, P2093,
P2094, P2095, P2227, P2228, or P2229 must run and pass.
* DTC P2176 is not set.
* The engine is operating for greater than 1 s.
* The MAF signal is greater than 0.00 g/s and steady.
* The ignition voltage is greater than 10.5 V.
* The engine coolant temperature (ECT) is greater than 10掳C (50掳F).
* The long term fuel trim is enabled.
* The throttle angle is steady +/-2 %.
* The ECM detects greater than 150 revolutions of the crankshaft.
* DTC P0101 runs continuously once the above conditions are met for greater than 2 s.
Conditions for Setting the DTC
* The ECM detects that the MAF sensor signal is greater or less than the calculated air flow based on engine load and engine speed.
OR
* The ECM detects that the MAF sensor signal is greater or less than the calculated air flow, and The ECM detects a significant error in the
long term fuel trim at cruising speed.
Action Taken When the DTC Sets
DTC P0101 is a Type B DTC.
Conditions for Clearing the DTC
DTC P0101 is a Type B DTC.
Diagnostic Aids
* Inspect the harness of the MAF sensor to verify that it is not routed too close to the following components:
- The secondary ignition wires or coils
- Any solenoids
- Any relays
- Any motors
* Inspect the hydro-carbon (HC) absorber, if equipped, in the air cleaner assembly for ruptures that would leak charcoal into the air intake,
contaminating the sensing element.
* Inspect for any contamination, water intrusion, or debris on the sensing elements of the MAF sensor. If debris is present, clean the sensor. If
the sensor cannot be cleaned, replace the sensor.
* A high resistance may cause a driveability concern before this DTC sets.
Reference Information
Schematic Reference
Engine Controls Schematics (LLT) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)Engine Controls Schematics
(LF1) (See: Diagrams/Electrical Diagrams/Powertrain Management/System Diagram)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Description and Operation
