FREE REPAIR MANUALS & LABOR GUIDES 1982-2013 Vehicles
Courtesy of Operation CHARM: Car repair manuals for everyone.
Home >> Chevy Truck >> 2009 >> Express 3500 V8-6.6L DSL Turbo >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P2033

P2033




DTC P2032 or P2033

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) 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

* DTCs P2032 and P2033 are Type A DTCs.
* DPF regeneration will be inhibited.

Conditions for Clearing the DTC

DTCs 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 (ECT Sensors) (Temperature Versus Resistance (ECT Sensors))Temperature Versus Resistance (EGR Temperature Sensors) (Temperature Versus Resistance (EGR Temperature Sensors))Temperature Versus Resistance (EGT Sensors) (Temperature Versus Resistance (EGT Sensors))Temperature Versus Resistance (Fuel Temperature Sensor) (Temperature Versus Resistance (Fuel Temperature Sensor))Temperature Versus Resistance (IAT Sensor 1) (Temperature Versus Resistance (IAT Sensor 1))Temperature Versus Resistance (IAT Sensor 2) (Temperature Versus Resistance (IAT Sensor 2)).
* 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.

Reference Information
Schematic Reference

Engine Controls Schematics (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Diesel Particulate Filter (DPF) System Description (Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Diagnostic Trouble Code Descriptions)
Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information
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 and scan tool disconnected 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 (ECT Sensors) (Temperature Versus Resistance (ECT Sensors))Temperature Versus Resistance (EGR Temperature Sensors) (Temperature Versus Resistance (EGR Temperature Sensors))Temperature Versus Resistance (EGT Sensors) (Temperature Versus Resistance (EGT Sensors))Temperature Versus Resistance (Fuel Temperature Sensor) (Temperature Versus Resistance (Fuel Temperature Sensor))Temperature Versus Resistance (IAT Sensor 1) (Temperature Versus Resistance (IAT Sensor 1))Temperature Versus Resistance (IAT Sensor 2) (Temperature Versus Resistance (IAT Sensor 2)).

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

* Diesel Particulate Filter (DPF) Regeneration Enable (Diesel Particulate Filter (DPF) Regeneration Enable)
* Exhaust Temperature Sensor Replacement - Position 2 (Exhaust Temperature Sensor Replacement - Position 2)
* Engine Control Module Replacement (Service and Repair)

Repair Verification

1. Install any components or connectors that have been removed or replaced during diagnosis.
2. Perform any adjustment, programming, or setup procedures that are required when a component or module is removed or replaced.
3. Clear the DTCs.
4. Turn OFF the ignition for 90 seconds.
5. Duplicate the Conditions for Running the DTC and use the freeze Frame/Failure Records, if applicable, in order to verify the DTC does not reset. If the DTC resets or another DTC is present, refer to the Diagnostic Trouble Code (DTC) List - Vehicle (Diagnostic Trouble Code Descriptions) and perform the appropriate diagnostic procedure.
6. Perform the Diesel Particulate Filter (DPF) Service Regeneration (Diesel Particulate Filter (DPF) Service Regeneration).

pro multis Credits:Operation CHARM About Operation CHARM