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P0103



DTC P0103

DTC DESCRIPTORS

DTC P0102
DTC P0102 Mass Air Flow (MAF) Sensor Circuit Low Voltage

DTC P0103
DTC P0103 Mass Air Flow (MAF) Sensor Circuit High Voltage

DIAGNOSTIC FAULT INFORMATION






IMPORTANT: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

TYPICAL SCAN TOOL DATA

MAF Sensor:






CIRCUIT/SYSTEM DESCRIPTION
The mass air flow (MAF) sensor is integrated with the intake 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 MAF sensor produces an output voltage based on the inlet air flow through the air induction system. This output voltage will display on the scan tool as a voltage parameter and as a grams per second (g/s) parameter. If the ECM detects that the actual MAF sensor voltage signal is more than or less than the possible range of a normally operating sensor it will set a DTC.

CONDITIONS FOR RUNNING THE DTC

P0102
- The engine is running for more than 2 seconds.
- The engine speed is between 500-3,100 RPM.
- The above conditions are met for more than 3 seconds.
- This DTC runs continuously within the enabling conditions.

P0103
- The engine is running for more than 2 seconds.
- The above conditions are met for more than 3 seconds.
- This DTC runs continuously within the enabling conditions.

CONDITIONS FOR SETTING THE DTC

P0102
The ECM detects that the MAF sensor is less than 0.20 volts or 1.5 g/s for more than 6 seconds.

P0103
The ECM detects that the MAF sensor is more than 4.8 volts or 555 g/s for more than 6 seconds.

ACTION TAKEN WHEN THE DTC SETS
- The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
- The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

CONDITIONS FOR CLEARING THE MIL/DTC
- The control module turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
- A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
- Clear the MIL and the DTC with a scan tool.

SPECIAL TOOLS REQUIRED
J 35616-200 Test Lamp Kit

CIRCUIT/SYSTEM VERIFICATION
1. Verify the integrity of the air induction system by inspecting for the following conditions:
- Damaged components
- Loose or improper installation
- Restrictions in the MAF air induction system
- Water intrusion
2. A wide open throttle (WOT) acceleration from a stop should cause the MAF sensor parameter on the scan tool to increase rapidly. This increase should be from 30-37 g/s at idle to 400 g/s or more at the time of the 2-3 shift.
3. Verify that any electrical aftermarket devices are properly connected and grounded. Refer to Checking Aftermarket Accessories.

CIRCUIT/SYSTEM TESTING

P0102
1. Inspect the fuse supplying the ignition 1 voltage circuit of the MAF sensor.
- If the fuse is open, then test the spliced circuits and the components for a short to ground.

IMPORTANT: If you cannot duplicate the condition, 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.

2. Disconnect the MAF sensor.
3. Turn ON the ignition, with the engine OFF.
4. Connect a test lamp between the MAF sensor ignition 1 voltage circuit and a good ground.

IMPORTANT: Use the J 35616-200 for this test. If the J 35616-200 is not available, use a test lamp that measures more than 20 ohms.

5. With the test lamp still connected, measure the voltage of the ignition 1 voltage circuit at the test lamp probe, with a DMM connected to a good ground.
- If the voltage is not within 1.5 volts of battery voltage, repair the high resistance or the open in the circuit.
6. Test the MAF sensor signal circuit for a short to ground, an open or high resistance.
7. Connect a 3-amp fused jumper wire between the ignition 1 voltage circuit of the MAF sensor and the signal circuit of the MAF sensor.
8. Observe the MAF Sensor parameter. for a value of more than 500 g/s.
- If the MAF Sensor parameter is not more than 500 g/s, test for high resistance in the MAF sensor signal circuit or replace the ECM.
- If the MAF Sensor parameter is more than 500 g/s, replace the MAF sensor.

P0103
1. Disconnect the MAF sensor connector.
2. Turn ON the ignition, with the engine OFF.
3. Observe the MAF sensor parameters with a scan tool.
- If the MAF sensor parameters are 0 volts or 0 g/s, replace the MAF sensor.
- If the MAF sensor parameters are more than 4.7 volts or more than 500 g/s, test the signal circuit for a short to 5-volt reference or battery voltage or a faulty ECM.
4. Turn OFF the ignition, and all electrical accessories. Allow 60 seconds for the control modules to power down before proceeding and before taking a resistance measurement.

IMPORTANT: The DMM and test leads must be calibrated to 0 ohms in order to prevent misdiagnosis. Use the DMM to perform this test. Refer to the DMM User Manual for calibration procedure.

5. Measure the resistance of the low reference circuit at the MAF Sensor connector with a DMM connected to a good ground.
- If the resistance is more than 2.0 ohms, then test the circuit for a high resistance or a faulty ECM.
- If the MAF sensor circuits test normal, then replace the MAF sensor.

REPAIR INSTRUCTIONS

IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.
- Mass Air Flow (MAF)/Intake Air Temperature (IAT) Sensor Replacement for MAF/IAT sensor replacement
- Control Module References for ECM replacement, setup, and programming
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