![]() ![]() Inspect harness connectors, component connectors, and all male and female terminals for the following Disconnect the related component harness connectors.Ĥ. Disconnect all related in-line harness connections (if equipped).ģ. Start the engine and allow it to idle for one minute.ġ. Reconnect the PCM C1 harness connector.ĥ. Replace the MAF Sensor in accordance with the Service Information.(Refer to 14 - Fuel System/Fuel Injection, Diesel/SENSOR, Mass Airflow (MAF) /Removal)Ģ. (Refer to 29 - NonDTC Diagnostics/Drivability - Diesel - Diagnosis and Testing)ġ. Perform the CHECKING THE EXHAUST SYSTEM FOR LEAKS diagnostic procedure. Visually inspect the Exhaust System for any restrictions.Ģ. (Refer to 29 - Non- DTC Diagnostics/Drivability - Diesel - Diagnosis and Testing)ġ. Perform the INTAKE AIR PRESSURE TEST diagnostic procedure. Visually inspect the Intake System for any restrictions.Ģ. Repair the (K157) MAF Sensor Signal circuit for a short to ground.ġ.Measure the resistance between ground and the (K157) MAF Sensor Signal circuit at the Mass Air Flow CHECK THE (K157) MAF SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUNDġ. Repair the (K157) MAF Sensor Signal circuit for an open or high resistance.Ħ.Measure the resistance of the (K157) MAF Sensor Signal circuit between the MAF Sensor harness connector and the PCM C1 harness connector. CHECK THE (K157) MAF SENSOR SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCEġ. Repair the short between the (K157) MAF Sensor Signal Signal circuit and (K957) Return circuit.ĥ.Measure the resistance between the (K157) MAF Sensor Signal circuit and (K957) Return circuit at the MAF Sensor harness connector. CHECK FOR THE (K157) MAF SENSOR SIGNAL CIRCUIT SHORTED TO THE (K916) RETURN CIRCUITġ. Repair the short between the (K188) Mass Air Flow Supply circuit and (K957) Return circuit.Ĥ.Measure the resistance between the (K188) MAF Supply circuit and (K957) Return circuit at the MAF Sensor harness connector. Disconnect the PCM C1 harness connector.ģ. CHECK FOR THE (K188) MAF SUPPLY CIRCUIT SHORTED TO THE (K957) RETURN CIRCUITĢ. (Refer to 28 - DTC-Based Diagnostics/MODULE, Powertrain Control ( PCM) - Standard Procedure).ģ. Perform the POWERTRAIN VERIFICATION TEST - 6.7L.Repair the (K188) Mass Air Flow Supply circuit for an open or short to ground.Measure the voltage of the (K188) MAF Supply circuit at the MAF Sensor harness connector. NOTE: Check connectors - Clean/repair as necessary.Ĥ. Turn the ignition on, engine not running. Perform the INTERMITTENT CONDITION diagnostic procedure.Start the engine and let idle for at least two minutes. (Refer to 28 - DTCBased Diagnostics/MODULE, Powertrain Control ( PCM) - Standard Procedure).ģ. MAF SENSOR SIGNAL CIRCUIT SHORTED TO GROUNDĪlways perform the Pre-Diagnostic Troubleshooting procedure before proceeding. MAF SENSOR SIGNAL CIRCUIT SHORTED TO THE RETURN CIRCUIT INTAKE OR EXHAUST SYSTEM LEAKING OR RESTRICTED The Powertrain Control Module ( PCM) has detected the Mass Air Flow (MAF) Sensor value is below a.When Monitored: This diagnostic runs continuously when the following conditions are met: The engine running monitor compares an estimated fresh air flow value to the MAF Sensor reading. Adjustments for air temperature and humidity are taken into consideration, since they also affect the temperature of the heated wire or film. The current flow is changed to a frequency, which is sent to the Powertrain Control Module ( PCM) and interpreted as air flow. The drop in resistance allows moreĬurrent to flow through it in order to maintain the programmed temperature. The heated wire or film is a Positive Temperature Coefficient (PTC) resistor, which means that the resistance of it drops when the temperature drops. This wire is positioned in the air stream and is heated by the electrical current that the voltage produces. A constant voltage is applied to a heated wire. The Mass Air Flow (MAF) Sensor is a frequency based device. P0102 - Mass Air Flow Sensor "A" Circuit Low ![]()
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