P145E
DTC P145E
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 P145E
- Evaporative Emission (EVAP) System Leak Detection Pump to Vent Solenoid Valve Leak Detected
Circuit/System Description
This evaporative emissions (EVAP) system is a closed system. This vehicle's internal combustion engine (ICE), which is the consistent source of vacuum for conventional vehicles, only runs at predetermined times for regeneration. Therefore the need for a consistently reliable vacuum source - the evaporative emissions system leak detection pump.
The EVAP leak detection pump assembly consists of three main components - a vacuum pump, a switching valve, and a pressure sensor. This DTC deals with a small leak (0.51 mm/0.020 in) between the EVAP leak detection pump and the vent valve.
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 P2450 are not present.
* Purge valve closed
* Vent solenoid valve transitions closed
* EVAP leak detection pump switching valve in 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
* Intake air temperature 4-45°C
* 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
If the EVAP leak detection pump pressure sensor vacuum reading is less than the 0.020 reference orifice vacuum after 30 s, then a small leak is detected between the pump and the vent solenoid valve, and the DTC fails.
Action Taken When the DTC Sets
DTC P145E is a Type B DTC.
Conditions for Clearing the DTC
DTC P145E is a Type B DTC.
Diagnostic Aids
* The EVAP system can be filled with smoke at the fresh air side of the vacuum pump using the adapters in the EN 41413-300 - EVAP cap and plug kit.
* Smoke seen coming out of the fresh air side of the EVAP leak detection pump assembly is not consider a failed part. This includes the electrical connection port as diagnostics will not detect a leak on the fresh air side of the system.
* To help locate intermittent leaks, use the EN 41413-200 - evaporative emissions system tester to introduce smoke into the EVAP system. Move all the EVAP components while observing for smoke with a high intensity white light.
* To improve the visibility of the smoke exiting the EVAP system, observe the suspected leak area from different angles with the EN 41413-SPT - high intensity white light.
* If a small leak is difficult to find, it may be necessary to remove the EVAP components and test them one at a time using the adapters in the EN 41413-300 - EVAP cap and plug kit.
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
Special Tools
* CH 48096 - EVAP Service Access Port Tool
* EN 41413-200 - Evaporative Emissions System Tester
* EN 41413-300 - EVAP Cap And Plug Kit
* EN 41413-SPT - High Intensity White Light
* GE 41415-30 - Fuel Tank Cap Adapter
For equivalent regional tools, refer to Special Tools (Diagnostic Tools) Special Tools (Diagnostic Tools).
Circuit/System Verification
* Verify that DTC P145E 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.
Circuit/System Testing
Note:
* Larger volume fuel tanks and/or those with lower fuel levels may require several minutes for the floating indicator to stabilize.
* Refer to the EN 41413-200 - Evaporative Emissions System Tester operation manual for detailed instructions.
Evaporative Leak Check
1. Using the scan tool output controls, select EVAP Test to create a vacuum on the EVAP system.
2. Observe the fuel tank pressure (FTP) sensor for a vacuum.
OR
Observe the EVAP leak detection pump sensor for a vacuum.
• If the EVAP leak detection pump sensor shows vacuum, but the FTP Sensor parameter does not show vacuum, replace the B150 Fuel Tank Pressure Sensor.
• If neither the FTP Sensor parameter nor the EVAP leak detection pump sensor shows vacuum, repair the restriction or leak in the purge path.
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