DTC P0102 or P0103 (LDK With Turbocharger)
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DTC P0102 or P0103 (LDK With Turbocharger)
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DTC P0102
Mass Air Flow (MAF) Sensor Circuit Low Frequency
DTC P0103
Mass Air Flow (MAF) Sensor Circuit High Frequency
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Diagnostic Fault Information
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Circuit
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Short to Ground
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Open /High Resistance
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Short to Voltage
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Signal Performance
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Ignition Voltage
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P0102
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P0101, P0102
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-
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P0101
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MAF sensor signal
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P0102
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P0102
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P0102
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P0101, P0103, P1101
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Ground
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-
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P0102
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-
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P0102
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MAF Sensor
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Circuit
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Short to Ground
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Open
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Short to Voltage
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Operating Conditions:
Engine Running at various operating conditions
Parameter Normal Range:
1.700-12.500 Hz
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Ignition Voltage
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0 Hz
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0 Hz
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-
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MAF sensor signal
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0 Hz
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0 Hz
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0 Hz
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Ground
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-
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0 Hz
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-
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Circuit/System Description
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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.
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 air flow through the sensor bore. The frequency varies in a range of near 1,700 Hz at idle to near 12,500 Hz at maximum engine load.
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Conditions for Running the DTCs
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The engine speed is more than 300 RPM.
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The ignition 1 signal is more than 10.5 V.
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The above conditions are met for greater than 1 s.
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This DTC runs continuously within the enabling conditions.
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Conditions for Setting the DTC
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P0102
The ECM detects that the MAF Sensor parameter is less than 1035 Hz for more than 0.5 s.
P0103
The ECM detects that the MAF Sensor parameter is greater than 15,152 Hz for more than 0.5 s.
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Action Taken When the DTC Sets
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DTCs P0102, P0103 are Type B DTCs.
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The ECM will disable boost control and limit the system to mechanical boost only, resulting in a substantial decrease in engine power.
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Conditions for Clearing the MIL/DTC
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DTCs P0102, P0103 are Type B DTCs.
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The charge air cooler (CAC) is connected to the turbocharger and to the throttle body by flexible ductwork that requires the use of special high torque fastening clamps. These clamps cannot be substituted.
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A steady or intermittent high resistance of 15 Ω or greater on the ignition voltage circuit will cause the MAF sensor signal to be increased by as much as 60 g/s.
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Depending on the current ambient temperature, and the vehicle operating conditions, a MAF sensor signal circuit that is shorted to the IAT signal circuit will increase or decrease the MAF sensor signal that is interpreted by the ECM. Additionally it may cause a rapid fluctuation in the IAT Sensor parameter.
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Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References
for scan tool information
Special Tools
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EL 38522
Variable Signal Generator Variable Signal Generator
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Circuit/System Verification
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1.
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Engine operating at idle, observe the scan tool MAF Sensor parameter. The reading should be between 1,700-2,600 Hz.
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2.
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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 2-6 g/s at idle to more than 200 g/s at the time of the 1-2 shift.
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3.
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Operate the vehicle within the conditions for running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
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1.
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Verify the integrity of the entire air induction system including all turbocharger components by inspecting for the following conditions:
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Loose or improper installation
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2.
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Ignition OFF, disconnect the harness connector at the B75B MAF/IAT sensor.
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3.
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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 Ω between the MAF sensor ground circuit terminal 2 or B and ground.
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4.
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If more than the specified range, test the ground circuit for an open/high resistance.
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5.
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Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 3 or C and ground.
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6.
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If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.
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7.
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Ignition ON, test for 4.8-5.2 V between the MAF signal circuit terminal 1 or A and ground.
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8.
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If less than the specified range, test the MAF signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
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9.
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If more than the specified range, test the MAF signal circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
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10.
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Ignition OFF, connect the red lead of the
EL 38522
Generator to MAF circuit terminal 1 or A at the MAF sensor harness connector. Connect the battery voltage supply to B+. Connect the black lead to ground.
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11.
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Set the
EL 38522
Generator Signal switch to 5 V, the Frequency switch to 5 K, and the Duty Cycle switch to Normal.
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12.
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Engine Idling, observe the scan tool MAF Sensor parameter. The scan tool MAF Sensor parameter should be between 4,950-5,050 Hz.
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13.
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If the MAF Sensor parameter is not within the specified range, replace the K20 ECM.
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14.
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If all circuits test normal, test or replace the B75B MAF/IAT sensor.
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
