DTC P118B, P1474-P1476, P147B, P24AF, P24B0-P24B6, P24C7-P24C9, P24D1,

Engine Controls and Fuel - 3.0L LM2 Diesel | Diagnostic Information and Procedures | Document ID: 5503554 DTC P118B, P1474-P1476, P147B, P24AF, P24B0-P24B6, P24C7-P24C9, P24D1, P24DA, or U04A4 Diagnostic Instructions Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle Review the description of Strategy Based Diagnosis: Strategy Based Diagnosis An overview of each diagnostic category can be found here: Diagnostic Procedure Instructions DTC Descriptor DTC P118B Particulate Matter Sensor Temperature Sensor Performance DTC P1474 Particulate Matter Sensor Electrode Supply Voltage Circuit DTC P1475 Particulate Matter Sensor Electrode Supply Voltage Circuit Low DTC P1476 Particulate Matter Sensor Electrode Supply Voltage Circuit High DTC P147B Particulate Matter Sensor Shunt Circuit Current Too High DTC P24AF Particulate Matter Sensor Performance DTC P24B0 Particulate Matter Sensor Circuit Low DTC P24B1 Particulate Matter Sensor Circuit High DTC P24B3 Particulate Matter Sensor Heater Control Circuit DTC P24B5 Particulate Matter Sensor Heater Control Circuit Low DTC P24B6 Particulate Matter Sensor Heater Control Circuit High DTC P24C7 Particulate Matter Sensor Temperature Circuit Performance DTC P24C8 Particulate Matter Sensor Temperature Circuit Low DTC P24C9 Particulate Matter Sensor Temperature Circuit High DTC P24D1 Particulate Matter Sensor Regeneration Incomplete DTC P24DA Particulate Matter Sensor Exhaust Sample Error DTC U04A4 Invalid Data Received From Particulate Matter Sensor Circuit/System Description For an overview of the component/system, refer to: Exhaust Aftertreatment System Description

	Component	Description
	B136 Exhaust Particulate Matter Sensor	The sensor measures the particulate matter in the form of soot in the exhaust.

Component	Description
	The actual sensor surface is only a few square millimeters in size. On the surface there are 2 microscopic comb-shaped electrodes with intertwined tines (electrical traces) to have the longest possible route of transitions from one to the other electrode. Soot is conductive, therefore when soot deposits between the electrodes, electrical current can flow from one electrode to the other. The more soot deposits between the electrodes, the lower the resistance. To measure the resistance, voltage is applied to the electrodes. The voltage also generates an electrical field that attracts the soot. If the sensor surface is saturated, the sensor is electrically heated to burn off the soot. The sensor sends measured values and state of health information via serial data to the ECM and the reductant control module.
K20 Engine Control Module	The control module controls a series of actuators to ensure optimal engine performance. The control module does this by reading values from a variety of sensors, interprets the data and adjusts the engine actuators accordingly.

Component

Description

The actual sensor surface is only a few square millimeters in size. On the surface there are 2 microscopic comb-shaped electrodes with intertwined tines (electrical traces) to have the longest possible route of transitions from one to the other electrode. Soot is conductive, therefore when soot deposits between the electrodes, electrical current can flow from one electrode to the other. The more soot deposits between the electrodes, the lower the resistance. To measure the resistance, voltage is applied to the electrodes. The voltage also generates an electrical field that attracts the soot. If the sensor surface is saturated, the sensor is electrically heated to burn off the soot. The sensor sends measured values and state of health information via serial data to the ECM and the reductant control module.

K20 Engine Control Module

The control module controls a series of actuators to ensure optimal engine performance. The control module does this by reading values from a variety of sensors, interprets the data and adjusts the engine actuators accordingly.

Conditions for Running the DTC P118B DTC P16D7, P16D8, P16D9, P24D0, P262B, U02A3 = Not set DTCs related to the following system/component = Not Set – B17 Barometric Pressure Sensor – B131 Exhaust Temperature Sensor No other DTCs related to the concerned component are set. Barometric Pressure = Greater than 70 kPa (10.2 PSI) Ignition Off Time = For greater than 8 h Ignition and Start Switch Signal = On Ignition and Start Signal = Greater than 11 V Reductant Control Module Relays 1 and 2 = On Frequency the DTC runs = Continuously — After the running conditions are met P1474, P1475, P1476, P147B, P24B1, P24B3, P24B5, P24B6, P24C8, P24C9 DTC P16D7, P16D8, P16D9, P24D0, U02A3 = Not set No other DTCs related to the concerned component are set. Ignition and Start Switch Signal = On Ignition and Start Signal = Greater than 11 V { P147B } — Particulate Matter Sensor Temperature = 200 to 392°C (425 to 797°F) Reductant Control Module Relays 1 and 2 = On Frequency the DTC runs = Continuously — After the running conditions are met — For greater than 1.5 s P24AF DTC P16D7, P16D8, P16D9, P24D0, U02A3 = Not set No other DTCs related to the concerned component are set. Ignition and Start Switch Signal = On Ignition and Start Signal = Greater than 11 V Reductant Control Module Relays 1 and 2 = On Frequency the DTC runs = Continuously — After the running conditions are met — For greater than 2 min P24B0 DTC P16D7, P16D8, P16D9, P24D0, U02A3 = Not set No other DTCs related to the concerned component are set. Ignition and Start Switch Signal = On Ignition and Start Signal = Greater than 11 V Particulate Matter Sensor Temperature = 560 to 800°C (1,040 to 1,472°F) Reductant Control Module Relays 1 and 2 = On Frequency the DTC runs = Continuously — After the running conditions are met P24B4 DTC P16D7, P16D8, P16D9, P24D0, P262B, U02A3 = Not set DTCs related to the following system/component = Not Set – B34 Engine Coolant Temperature Sensor – B65 Manifold Absolute Pressure and Intake Air Temperature Sensor – B75 Mass Airflow Sensor No other DTCs related to the concerned component are set. Ambient Air Temperature = Warmer than −12°C (10°F) Ignition and Start Switch Signal = On Ignition and Start Signal = Greater than 11 V Reductant Control Module Relays 1 and 2 = On Frequency the DTC runs = Continuously — After the running conditions are met P24C7 DTC P16D7, P16D8, P16D9, P24D0, P262B, U02A3 = Not set DTCs related to the following system/component = Not Set – B17 Barometric Pressure Sensor – B34 Engine Coolant Temperature Sensor – B65 Manifold Absolute Pressure and Intake Air Temperature Sensor – B75 Mass Airflow Sensor – B131 Exhaust Temperature Sensor No other DTCs related to the concerned component are set. Ambient Air Temperature = Warmer than −40°C (−40°F) Barometric Pressure = Greater than 60 kPa (8.7 PSI) Engine = Running Ignition and Start Switch Signal = On Ignition and Start Signal = Greater than 11 V Particulate Matter Sensor Operation = Allowed For greater than 5 s Reductant Control Module Relays 1 and 2 = On Frequency the DTC runs = Continuously — After the running conditions are met — For greater than 25.5 s P24D1 DTC P16D7, P16D8, P16D9, P24D0, U02A3 = Not set DTCs related to the following system/component = Not Set – B17 Barometric Pressure Sensor – B131 Exhaust Temperature Sensor No other DTCs related to the concerned component are set. Ignition and Start Switch Signal = On Ignition and Start Signal = Greater than 11 V Reductant Control Module Relays 1 and 2 = On Frequency the DTC runs = Continuously — After the running conditions are met P24DA DTC P16D7, P16D8, P16D9, P24D0, P262B, U02A3 = Not set DTCs related to the following system/component = Not Set – B17 Barometric Pressure Sensor – B131 Exhaust Temperature Sensor No other DTCs related to the concerned component are set. Barometric Pressure = Greater than 70 kPa (10.2 PSI) Engine = Running Ignition and Start Switch Signal = Off — For greater than 8 h Ignition and Start Signal = Greater than 11 V Particulate Matter Sensor Operation = Allowed For greater than 5 s Particulate Matter Sensor Temperature = −20 to 200°C (−4 to 392°F) Reductant Control Module Relays 1 and 2 = On Frequency the DTC runs = Continuously — After the running conditions are met U04A4 Ignition and Start Switch Signal = On Ignition and Start Signal = Greater than 11 V Frequency the DTC runs = Continuously — After the running conditions are met Conditions for Setting the DTC Particulate Matter Sensor = Not within a calibrated range Actions Taken When the DTC Sets DTCs listed in the DTC Descriptor category = Type B Conditions for Clearing the DTC DTCs listed in the DTC Descriptor category = Type B Reference Information Schematic Reference Engine Controls Schematics Connector End View Reference Master Electrical Component List Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs DTC Type Reference Powertrain Diagnostic Trouble Code (DTC) Type Definitions Scan Tool Reference Control Module References Circuit/System Verification

Ignition » On / Vehicle » In Service Mode
Verify there are no DTCs set related to the following component/system: – B17 Barometric Pressure Sensor – B34 Engine Coolant Temperature Sensor – B65 Manifold Absolute Pressure and Intake Air Temperature Sensor – B75 Mass Airflow Sensor – B131 Exhaust Temperature Sensor ⇒ If a related DTC is set Refer to: Diagnostic Trouble Code (DTC) List - Vehicle ⇓ If a related DTC is not set
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 data. Verify the DTC does not set. ⇒ If the DTC sets Replace the component: B136 Exhaust Particulate Matter Sensor ⇓ If the DTC does not set
All OK. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification Exhaust Particulate Matter Sensor Replacement