Test Description

WARNING: This page is about a different car, the 2007 Isuzu i-370, 2007 GMC Canyon, and 2007 Chevrolet Colorado. 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.

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.
4: This step will determine if incorrect harness routing has caused this DTC to set.
5: This step will determine if water intrusion has caused this DTC to set.
6: This step will determine 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: Engine Controls Connector End Views or Powertrain Control Module Connector End Views
1	Did you perform the Diagnostic System Check - Vehicle?	-	Go to Step 2	Go to Diagnostic System Check - Vehicle
2	Observe the Freeze Frame/Failure Records for this DTC. Turn OFF the ignition for 60 seconds. Start the engine. 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	Turn OFF the ignition. Disconnect the mass air flow (MAF)/intake air temperature (IAT) sensor. Start the engine. Observe the MAF sensor parameter with a scan tool. Is the MAF sensor parameter more than the specified value?	0 Hz	Go to Step 4	Go to Step 5
4	Turn OFF the ignition. Inspect the harness of the MAF sensor for incorrect routing that is too close to the following components: Any aftermarket accessories-Refer to Checking Aftermarket Accessories . Any solenoids Any relays Any motors Did you find and correct the condition?	-	Go to Step 11	Go to Step 8
5	Turn OFF the ignition. Inspect the air induction system for any water intrusion. Did you find and correct the condition?	-	Go to Step 11	Go to Step 6
6	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 block underhood connection and at the fuse Refer to the following: Circuit Testing Testing for Intermittent Conditions and Poor Connections Wiring Repairs Connector Repairs Did you find and correct the condition?	-	Go to Step 11	Go to Step 7
7	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 11	Go to Step 9
8	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 11	Go to Step 10
9	Replace the MAF/IAT sensor. Refer to Mass Airflow Sensor/Intake Air Temperature Sensor Replacement . Did you complete the replacement?	-	Go to Step 11	-
10	Replace the PCM. Refer to Control Module References for replacement, setup, and programming. Did you complete the replacement?	-	Go to Step 11	-
11	Clear the DTCs with a scan tool. Turn OFF the ignition for 60 seconds. Start the engine. 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 12
12	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