P2032
DTC P2032 or P2033
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC P2032
- Exhaust Temperature Sensor 2 (EGT-2) Circuit Low Voltage
DTC P2033
- Exhaust Temperature Sensor 2 (EGT-2) Circuit High Voltage
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The exhaust gas temperature (EGT) sensors are variable resistors that measure the temperature of the exhaust at the inlet and outlet of the diesel particulate filter (DPF). The engine control module (ECM) supplies a bias 5-volt signal to the EGT signal circuit, and supplies a ground to the low reference circuit. When the EGT sensor is cold, the sensor resistance is low. When the EGT temperature increases, the sensor resistance increases.
Conditions for Running the DTC
* The ignition is ON.
* This DTC runs continuously when the above condition is met.
Conditions for Setting the DTC
P2032
The ECM detects that the EGT sensor 2 is less than 0.32 volt for greater than 1 second.
P2033
The ECM detects that the EGT sensor 2 is greater than 3.37 volts for greater than 1 second.
Action Taken When the DTC Sets
* DTC P2032 and P2033 are Type A DTCs.
* Normal regeneration will be inhibited.
Conditions for Clearing the DTC
DTC P2032 and P2033 are Type A DTCs.
Diagnostic Aids
* Inspect the EGT sensor terminals for corrosion.
* Measure and record the resistance of the EGT sensor at various ambient temperatures greater than -8°C (+18°F), then compare those measurements to the Temperature Versus Resistance (EGR Temperature Sensors) Temperature Versus Resistance (ECT Sensors) Temperature Versus Resistance (Fuel Temperature Sensor) Temperature Versus Resistance (IAT Sensor 1) Temperature Versus Resistance (IAT Sensor 2) Temperature Versus Resistance (EGT Sensors).
* EGT sensors may fail while operating under extreme temperatures. Review the Freeze Frame Failure Records to verify the failure criteria.
* A short to a separate 5-volt source occurs, this DTC will set.
Special Tools
J 25070 Heat Gun 500-750°F
Circuit/System Verification
1. Engine running, observe the scan tool EGT Sensor 2 parameter. The reading should be within the normal range -39 to +999°C (-38 to +1,830°F), depending on the current ambient temperature and the vehicle operating conditions.
2. Operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Circuit/System Testing
Important: Perform the Repair Verification after performing the Circuit/System Testing.
1. Ignition OFF, disconnect the harness connector at the EGT sensor 2.
2. Ignition OFF for 90 seconds, test for less than 5 ohms between the low reference circuit terminal B and ground.
^ If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
3. Ignition ON, verify the scan tool EGT Sensor 2 parameter is greater than 998°C (1,828°F).
^ If less than the specified range, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the ECM.
4. Install a 3A fused jumper wire between the signal circuit terminal A and the low reference terminal B. Verify the scan tool EGT 2 parameter is less than -35°C (-31°F).
^ If warmer 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.
5. If all circuits test normal, test or replace the EGT sensor.
Component Testing
Important: You must perform the Circuit/System Testing in order to verify the integrity of the EGT sensor circuits before proceeding with the Component Testing.
To simulate a high temperature failure condition, heat the sensor with the J 25070 while measuring and recording the resistance. Compare those measurements to the Temperature Versus Resistance (EGR Temperature Sensors) Temperature Versus Resistance (ECT Sensors) Temperature Versus Resistance (Fuel Temperature Sensor) Temperature Versus Resistance (IAT Sensor 1) Temperature Versus Resistance (IAT Sensor 2) Temperature Versus Resistance (EGT Sensors).
While monitoring the DMM, manipulate the sensor harness under varying temperature conditions to help duplicate an intermittent condition.
If a heat gun is unavailable, a high temperature condition may be achieved by test driving the vehicle at normal operating temperature while monitoring the scan tool EGT Sensor 1 and 2 parameters.
Repair Instructions
* Exhaust Particulate Filter Cleaning (LMM DPF Regeneration Enable) Exhaust Particulate Filter Cleaning (LMM DPF Service Regeneration) for Regeneration Enable
* Exhaust Temperature Sensor Replacement - Position 2
* Engine Control Module Replacement
Repair Verification
Notice: Refer to Diesel Particulate Filter (DPF) Regeneration Enable Notice.
Certain engine control conditions can cause the DPF to overload with soot. It will be necessary to clean the DPF as instructed to remove the excess soot accumulation. To avoid the customer's return to the service department, perform the appropriate Exhaust Particulate Cleaning procedure that is specified in the provided link.