Captiva

DTC P0102 or P0103 - With Special Tool

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 variable frequency signal based on the inlet air flow through the sensor bore. The signal varies with engine load and is displayed by the scan tool as Hertz (Hz) and grams per second (g/s).

P0102

The ECM detects that the MAF Sensor Signal parameter is less than 500 Hz (about 0.9 g/s) for greater than 10 s.

P0103

The ECM detects that the MAF Sensor Signal parameter is greater than 14,500 Hz (about 425 g/s) for greater than 10 s.

DTCs P0102 and P0103 are Type B DTCs.

DTCs P0102 and P0103 are Type B DTCs.

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: P0685, P0690 or B1380.

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

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 minutes, 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 B+, and the black lead to ground.
7. Set the J 38522 Variable Signal Generator signal to 5 V, the Frequency to 5K, and the Duty Cycle 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, replace the B75B mass air flow/intake air temperature sensor.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.