P2450

DTC P2450

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors
DTC P2450
- Evaporative Emission (EVAP) System Leak Detection Pump Switching Valve Performance

Circuit/System Description

EVAP leak detection pump switching valve performance - checks if the EVAP leak detection pump switching valve moved.

When the EVAP leak detection vacuum pump is ON, and the EVAP leak detection pump switching valve transitions from vent to not venting, pump, position, there should be an initial vacuum drop followed by a vacuum increase on a good system. The diagnostic looks for a difference relative to the reference vacuum, either an increase or decrease. No vacuum change indicates a problem with the EVAP leak detection pump switching valve and sets P2450. If P2450 fails, then the EVAP diagnostic leak detection test sequence is complete.

Conditions for Running the DTC

Propulsion System Not Active

Note: There are three possible time windows for this test to run. Up to that point, and through this time period, the propulsion system must not be active. These time windows are: 5.0, 7.0 or 9.5 hours.

* P043E, P043F, P0451, P1458, P145C, P145D and P2422 are not set.
* Purge solenoid valve closed
* Vent solenoid valve closed
* EVAP leak detection pump switching valve transitions from vent to not venting, pump position
* EVAP leak detection pump vacuum pump ON
* Odometer greater than 15.9 km (9.9 mi)
* Barometric Pressure 70-110 kPa (10.15-15.95 PSI)
* Fuel level 10-90%
* Engine Coolant Temperature less than 40°C (104°F)
* Intake air temperature 4-45°C (39-113°F)
* System Voltage greater than 10 V
* Vehicle speed less than 1.6 km/h (1 MPH)

If any of these conditions occur this test is aborted.
* Key up during test
* Refueling request button pressed
* Service bay test active
* Device control exceeds 0.5 seconds
* P0101, P0102, P0103, P0106, P0107, P0108, P0111, P0112, P0113, P0114, P0116, P0117, P0118, P0119, P0121, P0122, P0123, P0128, P012B, P012C, P012D, P0222, P0223, P0449, P0452, P0453, P0461, P0462, P0463, P0498, P0499, P0502, P0503, P06E4, P0722, P0723, P1221, P1459, P145A, P2066, P2067, P2068, P2400, P2401, P2402, P2418, P2419, P2420, P2537, P2610, U0073, U0074, U0140, U182D are not present.

Conditions for Setting the DTC

When the ELCP vacuum pump is commanded ON, and the EVAP leak detection pump switching valve transitions from vent to not venting, pump, position, if the difference between the first 0.51 mm (0.020 in) orifice reference vacuum measurement and the EVAP leak detection pump pressure sensor, gauge, vacuum reading is less than 0.4 kPa (0.06 PSI) after 5 s, then the EVAP leak detection pump switching value is stuck and the DTC fails.

Action Taken When the DTC Sets

DTC P2450 is a Type B DTC.

Conditions for Clearing the DTC

DTC P2450 is a Type B DTC.

Diagnostic Aids

Remove the vent pipe and the fresh air pipe from the EVAP leak detection pump assembly. Look into the pump openings for any restriction or debris.

The switching valve is integral to the EVAP leak detection pump assembly and is not serviced separately.

Reference Information
Schematic Reference

Engine Controls Schematics [1][2]Electrical Diagrams
Description and Operation

Evaporative Emission Control System Description Evaporative Emission Control System Description

Hybrid Modes of Operation Description Hybrid Modes of Operation Description
Electrical Information Reference

* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs

DTC Type Reference

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

Control Module References Control Module References for scan tool information

Circuit/System Verification

* Verify that DTC P2450 is not present.
* Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Component Testing

1. Command the EVAP leak detection pump switching valve with the scan tool.

• The switching valve command status should change from Not Venting to Venting.

2. If no change in status, inspect and repair any wiring or connection issues.
3. If status changes, but no switch valve movement occurs, replace the Q63 EVAP leak detection pump assembly.

Repair Instructions

* Clear DTCs.
* Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Evaporative Emission System Vacuum Leak Detection Pump Replacement Service and Repair
* Control Module References Control Module References for ECM replacement, setup, and programming