Service Information

Volt

DTC P145E

Diagnostic Instructions

•	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 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

The evaporative emission (EVAP) system uses a EVAP leak detection pump to test for system leaks. The EVAP leak detection pump assembly consists of the following components:

•	EVAP leak detection pump with reference orifice

•	EVAP leak detection pump switching valve

•	EVAP leak detection pump pressure sensor

This DTC sets when the ECM detects with a leak 0.51 mm (0.020 in) between the EVAP leak detection pump and the EVAP vent solenoid valve.

Conditions for Running the DTC

•

DTCs 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, P043E, P043F, P0451, P1458, P145C, P145D and P2450 are not set

•	The EVAP purge valve is closed

•	The EVAP vent solenoid valve transitions to closed

•	The EVAP leak detection pump switching valve in not venting, pump position

•	The EVAP leak detection pump vacuum pump is ON

•	The odometer greater than 16 km (10 mi)

•	The barometric pressure (BARO) is between 70-110 kPa (10-16 PSI)

•	The fuel level is between 10-90%

•	The engine coolant temperature is less than 40°C (104°F)

•	The inlet air temperature is between 4-45°C (39-113°F)

•	The system voltage is greater than 10 V

•	The vehicle speed is less than 1.6 km/h (1 MPH)

•	No ignition key up during this test

•	The refuelling request button is not pressed

•	A service bay test is not active

•	The device control is not active

•	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.

Conditions for Setting the DTC

The ECM detects, the vacuum reading is less than the reference vacuum for greater than 30 s.

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 GE-41413-300 .

•	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 J 41413-200 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 GE-41413-SPT .

•	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 GE-41413-300 .

•	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.

Reference Information

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Special Tools

•	GE-41413-300 EVAP Cap And Plug Kit

•	GE-41413-SPT High Intensity White Light

•	J 41413-200 Evaporative Emissions System Tester (EEST)

For equivalent regional tools, refer to Special Tools : Diagnostic Tools .

Circuit/System Verification

Verify the following conditions do not exist in the EVAP system:

•	Disconnected, incorrectly routed, kinked, or damaged EVAP pipes, O rings and hoses.

•	A damaged EVAP vent solenoid valve.

⇒	If you find any of the above conditions, repair as necessary.

Note: Refer to the J 41413-200 operation manual for detailed instructions in Evaporative Emission Control System Diagnosis

Disconnect the fresh air tube at the quick connector on the Q63 evaporative emission system leak detection pump and using adapters in the GE-41413-300 , specifically GE 41413-323, connect the J 41413-200

Note: Ensure that the vehicle underbody temperature is similar to the ambient temperature and allow the surrounding air to stabilise before starting the diagnostic procedure. The system flow will be less with higher temperatures.

Use the flow meter on the J 41413-200 calibrated to 0.51 mm (0.020 in) determine if there is a leak in the evaporative emission system. Compare the flow meter's stable floating indicator position to the red flag. The floating indicator should be below the red flag.

⇒	If a leak is detected, use the J 41413-200 to apply smoke to the EVAP system until the leak is located following the Evaporative Emission Control System Diagnosis

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: Refer to the J 41413-200 operation manual for detailed instructions.

Disconnect the Q13 evaporative emission vent solenoid valve from the hose going to the EVAP leak detection pump and install GE 41413-324 female EEST to fuel tank adapter and GE 41413-310 green cap to plug the hose.
Using J 41413-200 connected to the fresh air side of the Q63 evaporative emission system leak detection pump test the hose between the Q13 evaporative emission vent solenoid valve and the Q63 evaporative emission system leak detection pump for a leak.

⇒	If a leak is detected repair the affected component.

If no leak is found test the Q13 evaporative emission vent solenoid valve for a leak.
Test for no air flow through the Q13 evaporative emission vent solenoid valve by applying vacuum to the pump side of the valve. It should hold 1-2 in. Hg (3-7 kPa) for 30 s.

⇒	If not within the specified range, replace the Q13 evaporative emission vent solenoid valve.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure

•	Evaporative Emission System Vacuum Leak Detection Pump Replacement

•	Evaporative Emission Canister Vent Solenoid Valve Replacement