Captiva

DTC P0101 - With Special Tool

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 sensors. This is an explicit model-based diagnostic containing 4 separate models for the intake system.

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 throttle position 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.

The engine control module (ECM) detects that the actual measured airflow from the MAF, MAP, and throttle position sensors is not within range of the calculated airflow that is derived from the system of models for greater than 2 s.

DTC P0101 is a Type B DTC.

DTC P0101 is a Type B DTC.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

1. Verify that the following DTCs are not set:

•	5 V reference circuits

•	Camshaft position system performance

•	Engine controls ignition relay circuits

•	Ignition circuits--Body control module (BCM)

⇒	If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .

2. Verify that restrictions do not exist in the exhaust system. Refer to Restricted Exhaust .
3. Engine idling, observe the scan tool MAF Sensor parameter. The reading should be between 2,000-3,900 Hz (2-8 g/s), depending on the ECT.
4. A wide open throttle (WOT) acceleration from a stop should cause the MAF Sensor parameter on the scan tool to increase rapidly. This increase should be from 2-8 g/s at idle to greater than 180 g/s at the time of the 1-2 shift.
5. Verify the proper operation of the ECT and IAT sensors. A skewed or stuck ECT or IAT sensor will cause the calculated models to be inaccurate and may cause this DTC to run/fail when it should not. Refer to Temperature Versus Resistance - Intake Air Temperature Sensor .
6. Verify the proper operation of the MAP sensor. A skewed MAP sensor will cause the BARO value to be inaccurate. Refer to Diagnostic Trouble Code (DTC) List - Vehicle DTC P0106 for further diagnosis.
7. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

1. Verify the integrity of the entire air induction system by inspecting for the following conditions:

•	Any damaged components

•	Loose or improper installation

•	An air flow restriction

•	Any vacuum leaks

•	Water intrusion

•	In cold climates, inspect for any snow or ice buildup

•	Inspect the B75B mass air flow/intake air temperature sensor element for contamination.

2. Ignition OFF, disconnect the harness connector at the B75B mass air flow/intake air temperature sensor.
3. Ignition OFF, all vehicle systems OFF, this may take up to 2 min, test for less than 5 Ω between the ground circuit terminal B and ground.

⇒	If greater than the specified range, test the ground circuit for an open/high resistance.

4. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal C and ground.

⇒	If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.

⇒	If the circuit tests normal and the fuse is open, test all the components connected to the circuit and repair or replace as necessary.

5. Ignition ON, test for 4.8-5.2 V between the signal circuit terminal A and ground.

⇒	If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.

⇒	If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.

6. Ignition OFF, connect the red lead of the J 38522 Variable Signal Generator to the signal circuit terminal A at the B75B mass air flow/intake air temperature sensor harness connector. Connect the battery voltage supply to the B+, and the black lead to ground.
7. Set the J 38522 Variable Signal Generator signal switch to 5 V, the Frequency switch to 5K, and the Duty Cycle switch to Normal.
8. Engine idling, observe the scan tool MAF Sensor parameter. The scan tool MAF Sensor parameter should be between 4,950-5,050 Hz.

⇒	If the MAF Sensor parameter is not within the specified range, replace the K20 ECM.

9. If all other circuits test normal, test or replace the B75B mass air flow/intake air temperature sensor.

Perform the Diagnostic Repair Verification after completing the repair.