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Test Description

WARNING: This page is about a different car, the 2007 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 3:  This step tests for electromagnetic interference (EMI) on the signal circuit of the MAF sensor. A frequency reading with the MAF sensor disconnected may indicate an EMI related fault or a poor connection at the PCM. Disconnecting the MAF sensor may set additional related DTCs.
  2. 5:  This step determines if incorrect harness routing has caused this DTC to set.
  3. 6:  This step determines if water intrusion has caused this DTC to set.
  4. 7:  This step determines if high resistance at any point in the ignition 1 voltage circuit has caused this DTC to set.
DTC P0103

Step Action Values Yes No
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Powertrain Control Module Connector End Views or Engine Controls Connector End Views
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to DIAGNOSTIC SYSTEM CHECK - VEHICLE
2
  1. Observe the Freeze Frame/Failure Records for this DTC.
  2. Turn OFF the ignition for 90 seconds.
  3. Start the engine.
  4. 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.
Did the DTC fail this ignition?		 - Go to Step 3  Go to Diagnostic Aids
3 
  1. Turn OFF the ignition.
  2. Disconnect the mass air flow (MAF)/intake air temperature (IAT) sensor.
  3. Start the engine.
  4. Select the Induction Data List.
  5. Observe the MAF Sensor parameter with a scan tool.
Is the MAF Sensor parameter more than the specified value?		 0 Hz Go to Step 5  Go to Step 4 
4
  1. Turn OFF the ignition.
  2. Review the schematics for the MAF/IAT sensor.
  3. Connect a jumper wire between each of the 5 terminals of the MAF/IAT sensor harness connector and the corresponding 5 terminals of the MAF/IAT sensor. Refer to Probing Electrical Connectors and Using Fused Jumper Wires .
  4. Start the engine and allow it to reach operating temperature.
  5. Measure the frequency from the signal circuit of the MAF sensor to a good ground with a DMM.
Does the DMM display a frequency within the specified range?		 1,600-2,500 Hz Go to Step 5  Go to Step 6 
5 
  1. Turn OFF the ignition.
  2. Inspect the harness of the MAF sensor for incorrect routing that is too close to the following components:
Did you find and correct the condition?		 - Go to Step 12  Go to Step 9 
6 
  1. Turn OFF the ignition.
  2. Inspect the air induction system for any water intrusion.
Did you find and correct the condition?		 - Go to Step 12  Go to Step 7 
7  Test the ignition 1 voltage circuit of the MAF sensor for the following conditions:
  • An intermittent high resistance in the circuit
  • An intermittent high resistance at the fuse in the underhood fuse block

Refer to the following procedures:
Did you find and correct the condition?		 - Go to Step 12  Go to Step 8 
8 Test for an intermittent and for a poor connection at the MAF sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 12  Go to Step 10 
9 Test for an intermittent and for a poor connection at the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 12  Go to Step 11 
10 Replace the MAF/IAT sensor. Refer to Mass Airflow Sensor Replacement .
Did you complete the replacement?		 - Go to Step 12  -
11 Replace the PCM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 12  -
12
  1. Clear the DTCs with a scan tool.
  2. Turn OFF the ignition for 90 seconds.
  3. Start the engine.
  4. 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.
Did the DTC fail this ignition?		 - Go to Step 2  Go to Step 13 
13 Observe the Capture Info with a scan tool.
Are there any DTCs that have not been diagnosed?		 - Go to Diagnostic Trouble Code (DTC) List - Vehicle System OK
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