SAAB WIS ONLINE

DTC P0100-P0103

DTC P0100-P0103

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 Descriptors

DTC P0100

Mass Air Flow (MAF) Sensor Circuit

DTC P0102

Mass Air Flow (MAF) Sensor Circuit Low Frequency

DTC P0103

Mass Air Flow (MAF) Sensor Circuit High Frequency

Diagnostic Fault Information

Circuit Short to Ground High Resistance Open Short to Voltage Signal Performance
Ignition Voltage

P0100

P0100

P0100

-

P0101

MAF Sensor Signal

P0100

P0102

P0100

P0102

P0101

Low Reference

-

P0102

P0100

-

P0101



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 ignition is ON, or the engine is operating.

• The ignition voltage is greater than 10 volts.

• DTC P0100, P0102 and P0103 run continuously once the above conditions are met for 1 second.


Conditions for Setting the DTC

P0100

The ECM detects that the MAF sensor signal is 0.0 Hz.

P0102

The ECM detects that the MAF sensor signal is less than 1135 Hz.

P0103

The ECM detects that the MAF sensor signal is greater than 15,152 Hz.

Action Taken When the DTC Sets

DTCs P0100, P0102, P0103 are Type B DTCs.

Conditions for Clearing the DTC

DTCs P0100, P0102, P0103 are Type B DTCs.

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

Connector End View Reference

Component Connector End Views

Description and Operation

Air Intake System Description

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

Special Tools

J 38522 Variable Signal Generator

Circuit/System Verification


1. Allow the engine to idle for 1 minute and check the diagnostic trouble code information with a diagnostic tool. Diagnostic trouble codes P0100, P0102 and P0103 must not be activated.

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. Ignition OFF, disconnect the harness connector at the B75 MAF sensor.

2. Ignition OFF, remove the fuse that supplies B+ to terminal 56 X2 of the ECM.

3. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 Ω between the ground circuit terminal 2 and ground.

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

5. Install the fuse that supplies B+ to terminal 56 X2 of the ECM.

6.
Warning

Do NOT use the low reference circuit in the component harness connector for this test. Damage to the control module may occur due to excessive current draw.


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

7. 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.

8. Test for 4.8-5.2 V between the signal circuit terminal 5 and the ground circuit terminal 2.

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

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

11. Ignition OFF, connect the red lead of the J 38522 to the signal circuit terminal 5 at the B75 MAF sensor harness connector. Connect the battery voltage supply to B+, and the black lead to ground.

12. Set the J 38522 Signal switch to 5 V, the Frequency switch to 5K, and the Duty Cycle switch to Normal.

13. Ignition ON, observe the scan tool MAF Sensor Hz parameter. The parameter should be between 4,950-5,050 Hz.

14. If the parameter is not within the specified range, replace the K20 ECM.

15. If all circuits/connections test normal, replace the B75 MAF sensor.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• Mass Airflow Sensor Replacement

• Control Module References for Engine Control Module replacement, setup, and programming