For 1990-2009 cars

### Diagnostic Instructions

1. Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
2. Review Strategy Based Diagnosis for an overview of the diagnostic approach.
3. Diagnostic Procedure Instructions provides an overview of each diagnostic category.

### DTC Descriptor

DTC P2282 51: Mass Air Flow Sensor Performance - Air Flow Too Low
DTC P2282 52: Mass Air Flow Sensor Performance - Air Flow Too High

### 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, 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 engine is running.

• | The DTCs run continuously when the above conditions are met.

### Conditions for Setting the DTC

#### P2282 51

The actual mass air flow is below the desired value for greater than 4 s.

#### P2282 52

The actual mass air flow is above the desired value for greater than 4 s.

### Action Taken When the DTC Sets

DTC P2282 is a Type A DTC.

### Conditions for Clearing the DTC

DTC P2282 is a Type A DTC.

### Diagnostic Aids

• | 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

#### Description and Operation

Turbocharger System Description

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### DTC Type Reference

LINK

#### Scan Tool Reference

Control Module References for scan tool information

#### Special Tools

EN 23738-A Mityvac

For equivalent regional tools, refer to LINK

### Circuit/System Verification

1. Engine running for 60 s, observe the DTC information with a scan tool. DTCs P0101, P0102 and P0103 should not set.
2. 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

1. Inspect the intake, and the exhaust systems, for the following:

• | Leaks or restrictions

• | Damaged or missing components

• | Aftermarket components

⇒ | If a condition is found, repair as necessary.

2. Disconnect the vacuum source from the Q41 Turbocharger Vane Position Control Solenoid Valve
3. Connect the EN 23738-A Mityvac to the Q41 Turbocharger Vane Position Control Solenoid Valve vacuum supply hose. Engine running, verify the vacuum is greater than -50 kPa (-7.25 PSI).

⇒ | If less than the specified range, inspect the vacuum supply hose and filter for a leak or restriction. If the supply hose is normal, replace the vacuum pump.

4. Connect the vacuum source to the Q41 Turbocharger Vane Position Control Solenoid Valve. Connect the EN 23738-A Mityvac to the Q41 Turbocharger Vane Position Control Solenoid Valve vacuum port. Engine running, command the Turbocharger Vane Position OFF with a scan tool. Verify the vacuum is 0 kPa (0 PSI).

⇒ | If greater than the specified range, replace the Q41 Turbocharger Vane Position Control Solenoid Valve.

5. Command the Turbocharger Vane Position ON with a scan tool. Verify the vacuum is greater than -50 kPa (-7.25 PSI).

⇒ | If less than the specified range, replace the Q41 Turbocharger Vane Position Control Solenoid Valve.

6. Inspect the turbocharger oil supply lines for a restriction.

⇒ | If restricted, repair or replace as necessary.

7. Command the EGR Valve ON and OFF with a scan tool. Verify the scan tool MAF Sensor parameter follows the commanded states.

⇒ | If there no change in the parameter reading, replace the Q14 Exhaust Gas Recirculation (EGR) Valve.

8. If all other components test normal, replace the B75B Mass Air Flow (MAF)/Intake Air Temperature (IAT) Sensor.

### Repair Instructions

Perform the Diagnostic Repair Verification

• | Vacuum Pump Assembly Replacement

• | LINK

• | Turbocharger Replacement

• | Mass Airflow Sensor with Intake Air Temperature Sensor Replacement

• | Control Module References for ECM replacement, setup, and programming