Service Information

Captiva

DTC P0101, P0102, or P0103 - LNP or LNQ

Diagnostic Instructions

•	Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

•	Review Strategy Based Diagnosis for an overview of the diagnostic approach.

•	Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC P0101 00 : Mass Air Flow (MAF) Sensor Performance

DTC P0102 00: Mass Air Flow (MAF) Sensor Circuit Low Frequency

DTC P0103 00: Mass Air Flow (MAF) Sensor Circuit High Frequency

Diagnostic Fault Information

Circuit	Short to Ground	Open/High Resistance	Short to Voltage	Signal Performance
Ignition Voltage	P0102 00	P0102 00	-	P0101 00
Signal	P0102 00	P0102 00	P0103 00	P0101 00
Ground	-	P0102 00	-	P0101 00

The mass air flow (MAF) sensor is located in the air inlet 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, greater 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.

Conditions for Running the DTC

•	The ignition is ON.

•	The battery voltage is greater than 8.5 V.

•	The engine speed is between 1 000-4 000 RPM.

•	Inspect the harness of the MAF sensor to verify that it is not routed too close to the following components:

-	Any solenoids

-	Any relays

-	Any motors

•	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

Connector End View Reference

Component Connector End Views

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Engine running for 60 s, observe the DTC information with a scan tool. DTCs P0101 00, P0102 00 and P0103 00 should not set.
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.

Circuit/System Testing

Ignition OFF, disconnect the harness connector at the B75B Mass Air Flow/Intake Air Temperature Sensor.
Ignition ON, verify a test lamp illuminates between the ignition circuit terminal 4 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 ignition circuit fuse is open, test all the components connected to the ignition circuit and replace as necessary.

Ignition ON, verify a test lamp illuminates between the ignition circuit terminal 4 and the ground circuit terminal 2.

⇒	If the test lamp does not illuminate, test the ground circuit for an open/high resistance.

Test for 4.8-5.2 V between the signal circuit terminal 5 and ground.

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

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

If all circuits test normal, replace the B75B Mass Air Flow/ Inlet Air Temperature Sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

•	Control Module References

•	Mass Airflow Sensor with Inlet Air Temperature Sensor Replacement