Test Description

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 ECM. 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 a steady or intermittent high resistance at any point in the 12-volt reference circuit of the MAF sensor 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 Engine Control Module (ECM) Connector End Views
1	Did you perform the Diagnostic System Check - Vehicle?	-	Go to Step 2	Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
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/IAT sensor for incorrect routing that is too close to the following components: Any aftermarket accessories-Refer to Checking Aftermarket Accessories in Wiring Systems. The ignition coils 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 12-volt reference circuit of the MAF sensor for the following conditions: An intermittent high resistance in the circuit A steady or intermittent high resistance at the connection for the engine control module (ECM) Refer to Inducing Intermittent Fault Conditions , Circuit Testing , Testing for Intermittent Conditions and Poor Connections ,Wiring Repairs , and Connector Repairs in Wiring Systems. 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/IAT sensor. Refer to Testing for Intermittent Conditions and Poor Connections , Repairing Connector Terminals , and Connector Repairs in Wiring Systems. 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 ECM. Refer to Testing for Intermittent Conditions and Poor Connections ,Repairing Connector Terminals , and Connector Repairs in Wiring Systems. Did you find and correct the condition?	-	Go to Step 11	Go to Step 10
9	Replace the MAF/IAT sensor. Refer to Mass Air Flow (MAF) Sensor Replacement . Did you complete the replacement?	-	Go to Step 11	-
10	Replace the ECM. Refer to Control Module References in Computer/Integrating Systems 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 in Vehicle DTC Information	System OK