P145F
DTC P043E, P043F, or P145F
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 P043E
- Evaporative Emission (EVAP) System Reference Orifice Flow Insufficient
DTC P043F
- Evaporative Emission (EVAP) System Reference Orifice Flow Excessive
DTC P145F
- Evaporative Emission (EVAP) System Reference Orifice Performance
Circuit/System Description
This evaporative emissions (EVAP) system is a closed system.
The EVAP leak detection pump assembly consists of three main components. A vacuum pump, a switching valve, and a pressure sensor. There is also a built-in 0.51 mm (0.020 in) reference orifice.
When the EVAP leak detection vacuum pump is ON, the EVAP leak detection pump pressure sensor (gauge) measures the vacuum across the reference orifice. The reference vacuum is established when the test time expires. This value is compared to a low and high limit to be sure it is between these limits and is good. This value must be within an acceptable range, which is determined by the low and high vacuum limits.
* If the vacuum level is below the low limit, then the reference orifice is missing and sets the P043F.
* If the vacuum level is above the high limit, then the reference orifice is plugged and sets the P043E.
* Additionally, P043E sets if the vacuum is in range, but has not stabilized and is still increasing in vacuum. (Actually a decrease in the absolute BARO reading from the EVAP leak detection pump pressure sensor).
* If the difference between the first reference vacuum measurement and the second reference vacuum measurement is greater than a threshold, then the reference measurements do not correlate and sets the P145F.
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.
* Purge valve closed
* Vent solenoid valve closed
* EVAP Leak Detection Pump switching valve in vent 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 s
* No Active 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, P0451, P0452, P0453, P0461, P0462, P0463, P0498, P0499, P0502, P0503, P06E4, P0722, P0723, P1221, P1458, P1459, P145A, P145C, P145D, P145E, P2066, P2067, P2068, P2400, P2401, P2402, P2418, P2419, P2420, P2421, P2422, P2450, P2537, P2610, U0073, U0074, U0140, U182D.
Conditions for Setting the DTC
P043E
* While performing the first 0.51 mm (0.020 in) reference orifice vacuum measurement for 6 minutes or the second 0.51 mm (0.020 in) reference orifice vacuum measurement for 30 s.
* If the difference between the EVAP leak detection pump pressure sensor (absolute) reading taken 10 s before the end of the reference measurement, and the final EVAP leak detection pump pressure sensor (absolute) reading is 0.22 kPa (0.031 PSI), then a stabilized 0.51 mm (0.020 in) reference orifice vacuum measurement could not be obtained and the DTC fails.
* If the first 0.51 mm (0.020 in) reference orifice vacuum measurement is greater than 4 kPa (0.58 PSI) after 6 minutes, then a plugged EVAP leak detection pump reference orifice is detected and the DTC fails.
* If the second 0.51 mm (0.020 in) reference orifice vacuum measurement is greater than 4.51 kPa (0.654 PSI) after 30 s, then a plugged EVAP leak detection pump reference orifice is detected and the DTC fails.
P043F
* If the first 0.51 mm (0.020 in) reference orifice vacuum measurement is less than 1.18 kPa (0.17 PSI) after 6 minutes, then a missing EVAP leak detection pump reference orifice is detected and the DTC fails.
* If the second 0.51 mm (0.020 in) reference orifice vacuum measurement is less than 1.18 kPa (0.17 PSI) after 30 s, then a missing EVAP leak detection pump reference orifice is detected and the DTC fails.
P145F
If the difference between the first 0.51 mm (0.020 in) reference orifice vacuum measurement and the second 0.51 mm (0.020 in) reference orifice vacuum measurement is greater than 0.51 kPa (0.073 PSI) after 30 s, then the first and second reference orifice vacuum measurements do not correlate and the DTC fails.
Action Taken When the DTC Sets
DTCs P043E, P043F and P145F are Type B DTCs.
Conditions for Clearing the DTC
DTCs P043E, P043F and P145F are Type B DTCs.
Diagnostic Aids
* Inspect the tube and clamps from the EVAP leak detection pump to the vent solenoid for damage. A damage/open tube may allow debris to enter the pump and plug the reference orifice.
* Remove the EVAP leak detection pump and look inside the pump opening for any debris that could restrict or plug the reference orifice. The reference orifice is a small opening at the 2 o'clock position in the pump vacuum opening. Inspect for missing or damage O-rings.
* With the fresh air tube removed from the EVAP leak detection pump assembly, blow controlled air, 5-10 PSI, into this tube. There should be air escaping from behind the fuel fill pocket indicating this tube and filter are not restricted.
* This part is not serviceable. It is very important that no debris be found in the pump fresh air inlet or vacuum openings, the tube between the vent solenoid valve and EVAP leak detection pump assembly as this could cause a P043E to set.
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
Component Testing
1. Service Mode active, record the EVAP leak detection pump pressure sensor reading. This is a BARO reading for reference. This value will vary depending on geographical location.
2. Command the vacuum pump ON with the scan tool and monitor the EVAP leak detection pump pressure sensor value/PSI. Observe this for a steady or increasing value/PSI.
• If the value/PSI is increasing, then there is a restriction in the orifice.
• If the value/PSI is steady, then the orifice is likely good.
3. If no problems were found, replace the Q63 EVAP system 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