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VIN L




DTC P0102 or P0103

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provide an overview of each diagnostic category.

DTC Descriptors
DTC P0102
- Mass Air Flow (MAF) Sensor Circuit Low Frequency

DTC P0103
- Mass Air Flow (MAF) Sensor Circuit High Frequency

Diagnostic Fault Information





Typical Scan Tool Data





Circuit/System Description

The mass air flow (MAF) sensor is integrated with the intake air temperature (IAT) sensor 1. 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 frequency based on the inlet airflow through the sensor bore. The frequency varies in a range of approximately 2,300 Hz at idle to near 9,000 Hz at maximum engine load, depending on engine coolant temperature (ECT).

When ECT reaches 60°C (140°F) the ECM commands a Rich Idle mode. During Rich Idle the exhaust gas recirculation (EGR) valve is commanded ON, and a lower frequency and g/s value will be indicated for the scan tool MAF parameters.

Conditions for Running the DTC

P0102
* DTCs P0335 or P0336 are not set.
* The engine is running for longer than 10 s.
* This DTC runs continuously when the enabling conditions are met.

P0103
* DTCs P0335 or P0336 are not set.
* The ignition is ON.
* This DTC runs continuously when the enabling conditions are met.

Conditions for Setting the DTC

P0102

The ECM detects that the MAF sensor is less than 1.08 g/s for greater than 3 s.

P0103

The ignition is ON, and the ECM detects a fault on the MAF sensor circuits.

OR

The engine is running, and the ECM detects that the MAF sensor signal is greater than 565 g/s, for greater than 3 s.

Action Taken When the DTC Sets

* DTCs P0102 and P0103 are Type A DTCs.
* The ECM commands reduced engine power.
* The driver information center (DIC) or indicator may display reduced engine power.
* Diesel particulate filter (DPF) regeneration is inhibited.

Conditions for Clearing the DTC

DTCs P0102 and P0103 are Type A DTCs.

Diagnostic Aids

* 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 6-8 g/s at idle to greater than 380 g/s at the time of the 1-2 shift.
* For an intermittent problem, visually and physically inspect the EGR valve for a possible binding or sticking in the open position.
* Verify that any electrical aftermarket devices are properly connected and grounded. Refer to Checking Aftermarket Accessories (Checking Aftermarket Accessories).
* A faulty EGR valve that does not close or open fully, may set this DTC.
* If P0113 is also set, check for a disconnected MAF/IAT sensor.

Reference Information
Schematic Reference

Engine Controls Schematics ([1][2]Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector End Views By Name)
Electrical Information Reference

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Powertrain Diagnostic Trouble Code (DTC) Type Definitions)
Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information
Special Tools

* J 38522 - Variable Signal Generator
* For equivalent regional tools, refer to Special Tools (Tools and Equipment).

Circuit/System Verification

1. Verify that DTCs P0106, P0403, or P046C are not set.

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

2. Engine idling, observe the scan tool MAF Sensor parameter. The reading should be between 10-38 g/s depending on the ECT sensor.
3. Operate the vehicle within the Conditions for Running the DTC to verify that the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

Note:
* You must perform the Circuit/System Verification before proceeding with the Circuit/System Testing.
* You must perform the Repair Verification after completing the Circuit/System Testing.

1. Ignition OFF, disconnect the harness connector at the B75B MAF/IAT sensor.
2. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 ohm between the MAF low reference circuit terminal E and ground.

• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.

3. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 ohm between the IAT sensor 1 low reference circuit terminal A and ground.

• If greater than the specified range, test the IAT sensor 1 low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.

4. Ignition ON, verify that a test lamp illuminates between the ignition voltage circuit terminal D and ground.

• If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.

5. Ignition ON, test for 4.8-5.2 V between the MAF sensor circuit terminal C and ground.

• If less than the specified range, test the MAF sensor 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 MAF sensor circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.

6. Ignition OFF, connect the harness connector at the B75B MAF/IAT sensor.
7. Engine idling at operating temperature, perform the following:

1. Command the EGR solenoid to 0 % with a scan tool.
2. Observe the Airflow Leak Equivalence Ratio parameter for 10 s. The value should be between 0.87:1 and 1.15:1.
3. Observe the Airflow Leak Equivalence Ratio parameter while slowly increasing the engine speed until reaching wide open throttle (WOT). After 10 s, the value should stabilize and be between 0.87:1 and 1.15:1.

• If not within the specified range, test the charge air cooler system and air inlet system for leaks. Perform the Full System Air Leak Test and the Induction System Smoke Test. Refer to Charge Air Cooler Diagnosis (Induction System Smoke Test) (Charge Air Cooler Diagnosis (Induction System Smoke Test)) Charge Air Cooler Diagnosis (Charge Air Cooler Air Leak Test) (Charge Air Cooler Diagnosis (Charge Air Cooler Air Leak Test)) Charge Air Cooler Diagnosis (Full System Air Leak Test) (Charge Air Cooler Diagnosis (Full System Air Leak Test)). If no air leaks are found, test all of the MAF sensor circuits for high resistance.

8. Visually inspect the EGR valve and verify the valve is in the closed position. Refer to Exhaust Gas Recirculation Valve Replacement (Exhaust Gas Recirculation Valve Replacement).

• If the EGR valve is not in the closed position, replace the EGR valve and gaskets.

9. Ignition OFF, disconnect the harness connector at the B75B MAF/IAT sensor.
10. Ignition OFF, connect the red lead of the J 38522 - generator to the MAF signal circuit terminal C at the B75B MAF/IAT sensor harness connector. Connect the battery voltage supply to B+. Connect the black lead to ground.
11. Set the J 38522 - generator signal switch to 5 V, the frequency to 5K, and the Duty Cycle to Normal.
12. 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.

13. If all circuits test normal, test or replace the B75B MAF/IAT sensor.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the repair.

* Perform the scan tool Diesel Particulate Filter (DPF) Regeneration Enable (Diesel Particulate Filter (DPF) Regeneration Enable) procedure if the DPF Soot Mass is less than 30 g. If the scan tool DPF Soot Mass is 30 g or greater, perform the Diesel Particulate Filter (DPF) Service Regeneration (Diesel Particulate Filter (DPF) Service Regeneration) procedure.
* Mass Airflow Sensor with Intake Air Temperature Sensor Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for ECM replacement, programming, and setup

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