• | 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 |
---|---|---|---|---|---|
Exhaust Gas Temperature Sensor 2 Signal | P2032 | P2033 | P20E2 | P2033 | P20E2 |
Exhaust Gas Temperature Sensor 2 Low Reference | -- | P2033 | P20E2 | P2033 | P20E2 |
Circuit | Short to Ground | Open | Short to Voltage |
---|---|---|---|
Operating Conditions: Ignition ON Parameter Normal Range: -39 to +999°C (-38 to +1830°F) | |||
Exhaust Gas Temperature Sensor 2 Signal | -40°C (-40°F) | 1 000°C (1,832°F) | 1 000°C (1,832°F) |
Exhaust Gas Temperature Sensor 2 Low Reference | -- | 1 000°C (1,832°F) | 1 000°C (1,832°F) |
The exhaust gas temperature (EGT) sensors 1 and 2 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.
• | The ignition is ON. |
• | This DTC runs continuously when the above condition is met. |
• | The ECM detects that the EGT sensor is less than 0.32 volt for greater than 1 second. |
• | The condition exists. |
The ECM detects that the exhaust temperature sensor is greater than 3.37 volts for greater than 1 second.
• | DTC P2032 and P2033 are Type A DTCs. |
• | Normal regeneration will be inhibited. |
DTC P2032 and P2033 are Type A DTCs.
• | 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. |
• | 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. |
Diesel Particulate Filter (DPF) System Description
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
J 25070 Heat Gun 500-750°F
Important: Perform the Repair Verification after performing the 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 ECM. |
⇒ | 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. |
⇒ | 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. |
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.
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.