• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provide an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
EGR Temperature Sensor 2 Signal | P041C | P041D, P040F | P041D | P040F |
EGR Temperature Sensor 2 Low Reference | -- | P041D, P040F | -- | P040F |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage |
---|---|---|---|
Operating Conditions: Ignition ON, engine OFF Parameter Normal Range: Varies depending on current ambient temperature and the vehicle operating conditions | |||
EGR Temperature Sensor 2 Signal | 900°C (1652°F) | -35°C (-31°F) | -33°C (-27.4°F) |
EGR Temperature Sensor 2 Low Reference | -- | -35°C (-31°F) | -- |
The exhaust gas recirculation (EGR) temperature sensors are variable resistors that measure the temperature of the exhaust gas at the inlet and outlet of the EGR cooler. The engine control module (ECM) supplies 5-volts to the EGR temperature sensor signal circuit and a ground for the low reference circuit. When the EGR temperature sensor is cold, the sensor resistance is high. When the EGR temperature increases, the sensor resistance decreases. With high sensor resistance, the ECM detects a higher voltage on the EGR temperature signal circuit. With lower sensor resistance, the ECM detects a lower voltage on the EGR temperature signal circuit.
• | The engine is running. |
• | The engine coolant temperature is more than 60°C (140°F). |
• | The engine is not in regeneration. |
• | This DTC runs continuously when the above conditions are met. |
• | The EGR valve is open more than 4 percent. |
• | The engine is running. |
• | The engine coolant temperature is more than 60°C (140°F). |
• | This DTC runs continuously when the above conditions are met. |
• | The EGR valve is open more than 4 percent. |
The ECM detects that the EGR temperature sensor is less than 0.26 volt for more than 1 second.
The ECM detects that the EGR temperature sensor is greater than 4.9 volts for more than 1 second.
DTCs P041C and P041D are Type A DTCs.
DTCs P041C and P041D are Type A DTCs.
• | Inspect the EGR temperature sensor terminals for corrosion. |
• | If the EGR temperature sensor 2 signal circuit is shorted to a separate 5-volt source, the DTC will set. |
• | EGR temperature sensors may fail while operating under extreme temperatures. Review the Freeze Frame/Failure Records to verify the failure criteria. |
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
⇒ | If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM. |
⇒ | If warmer more than the specified range, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the ECM. |
⇒ | If colder 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 ECM. |
Measure and record the resistance of the EGR temperature sensor 2 and compare those measurements to the Temperature Versus Resistance .
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for ECM replacement, setup, and programming |