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DTC P0545 or P0546Diagnostic Instructions
DTC DescriptorsDTC P0545: Exhaust Gas Temperature Sensor 1 Circuit Low VoltageDTC P0546: Exhaust Gas Temperature Sensor 1 Circuit High Voltage Circuit/System DescriptionThe exhaust gas temperature sensors are variable resistors that measures the temperature of the exhaust gas. The exhaust gas temperature sensor 1 is located in the exhaust pipe after the catalyst. The exhaust gas temperature 2 sensor is located in the exhaust gas particulate filter. The engine control module (ECM) supplies 5 V to the exhaust gas temperature signal circuit and supplies a ground to the low reference circuit. The exhaust gas temperature sensor temperature information is used by the ECM during the exhaust gas particulate filter cleaning process. The following table illustrates the difference between temperature, resistance, and voltage:
Conditions for Running the DTC
Conditions for Setting the DTCP0545The ECM detects that the exhaust gas temperature sensor is less than 0.1 V for greater than 1 s. P0546The ECM detects that the exhaust gas temperature sensor is greater than 4.9 V for greater than 1 s. Action Taken When the DTC SetsDTCs P0545, and P0546 are Type A DTCs. Conditions for Clearing the DTCDTCs P0545, and P0546 are Type A DTCs. Diagnostic Aids
Reference InformationSchematic ReferenceConnector End View ReferenceElectrical Information ReferenceDTC Type ReferencePowertrain Diagnostic Trouble Code (DTC) Type Definitions Scan Tool ReferenceControl Module References for scan tool information Circuit/System Verification
Circuit/System Testing
If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module. If less than the specified range, test the signal circuit for a short to ground. If the circuit tests normal, replace the K20 Engine Control Module. Caution: If the fuse in the jumper wire opens, the signal circuit may have a short to a voltage or a short to ground and the sensor might be damaged. If greater than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module. Repair InstructionsPerform the Diagnostic Repair Verification after completing the diagnostic procedure.
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