Vauxhall Workshop Service and Repair Manuals

DTC P0102 or P0103 - LDE

Diagnostic Instructions

DTC Descriptors

Diagnostic Fault Information

Typical Scan Tool Data

MAF Sensor

Circuit/System Description

The mass air flow (MAF) sensor is integrated with the inlet air temperature (IAT) sensor. The MAF sensor is an air flow meter that measures the amount of air entering the engine. The engine control module (ECM) uses the MAF sensor signal to provide the correct fuel delivery for all engine speeds and loads. A small quantity of air entering the engine indicates a deceleration or idle condition. A large quantity of air entering the engine indicates an acceleration or high load condition.

The ECM applies 5 V to the MAF sensor on the MAF sensor signal circuit. The sensor uses the voltage to produce a frequency based on the inlet air flow through the sensor bore.

Conditions for Running the DTC

Conditions for Setting the DTC

P0102 00

The ECM detects that the MAF sensor signal is less than 900 Hz (0 g/s) for greater than 5 s.

P0103 00

The ECM detects that the MAF sensor signal is greater than 11 000 Hz (179 g/s) for greater than 5 s.

Action Taken When the DTC Sets

DTCs P0102 00 and P0103 00 are Type B DTCs.

Conditions for Clearing the DTC

DTCs P0102 00 and P0103 00 are Type B DTCs.

Diagnostic Aids

Reference Information

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

EL 38522 Variable Signal Generator

For equivalent regional tools, refer to Special Tools .

Circuit/System Verification

1. Engine idling, observe the DTC information with a scan tool. DTC P0102 00 or P0103 00 should not set.
2. Verify the scan tool MAF sensor parameter is between 1.7-3.7 g/s.
3. Operate the vehicle within the conditions for running the DTC. 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 B75B Mass Air Flow/Intake Air Temperature Sensor.
2. Ignition OFF, test for less than 5 Ω between the ground circuit terminal 2 and ground.

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

3. Ignition ON, test for B+ between the ignition voltage circuit terminal 4 and ground.

⇒	If less than the specified range, test the ignition voltage circuit for a short to ground or an open/high resistance.

4. 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 a short to ground or an open/high resistance. 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.

5. Ignition OFF, connect the red lead of the EL 38522 Variable Signal Generator to the signal circuit terminal 5 at the MAF/IAT sensor harness connector. Connect the battery voltage supply to B+, and ground the black lead.
6. Set the EL 38522 Variable Signal Generator to the following specifications:

•	Signal switch to 5 V

•	Frequency switch to 5 KHz

•	Duty Cycle switch to normal

Note:  The engine will run rough and may stall.

7. Engine idling, observe the scan tool MAF Sensor Hz parameter. The scan tool MAF Sensor parameter should be between 4 950-5 025 Hz.

⇒	If not within the specified range, replace the K20 Engine Control Module.

8. If the 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.