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DTC P043E-00: Evaporative leak check pump/Reference orifice low flow
 
 
 
 
TECHNICAL DESCRIPTION
  • Reference orifice is built into the Evaporative Leak Check Module (ELCM).
  • The reference pressure is measured three times at most during the key-off evaporative leakage monitoring. When the measured reference pressure deviates from the normal range, it is judged that the reference orifice is blocked.
 
 
MONITOR EXECUTION
Once per driving cycle.
 
 
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)
Other Monitor (There is no temporary DTC set in memory for the item monitored below)
  • Evaporative emission purge solenoid monitor
  • Bypass valve monitor
  • Fuel tank solenoid valve monitor
  • Switching valve monitor
  • Canister pressure sensor monitor
  • Manifold absolute pressure sensor monitor
  • Fuel tank pressure sensor monitor
  • Fuel tank differential pressure sensor monitor
  • Barometric pressure sensor/Manifold absolute pressure correlation
  • Barometric pressure sensor monitor
  • Fuel level sensor monitor
  • Engine off timer monitor
  • Controller area network (CAN) monitor
Sensor (The sensor below is determined to be normal)
  • Engine coolant temperature sensor
  • Intake air temperature sensor
 
 
DTC SET CONDITIONS
Logic Flow Chart
Check Conditions
  • Power supply mode of electric motor switch is OFF.
  • 12V battery positive voltage is 11.0 volts or higher.
  • Engine coolant temperature is higher than 4°C (39°F) and lower than 35°C (95°F).
  • Intake air temperature at ECM wake-up is higher than 4°C (39°F) and lower than 35°C (95°F).
  • ECM is woken up in 5, 6 or 8.5 hours since the power supply mode of electric motor switch was OFF.
  • Barometric pressure is 76 kPa (22.4 in.Hg) or higher.
  • Fuel level is 85 percent or less.
  • Fuel tank pressure at ECM wake-up is less than 19.96 kPa (5.89 in.Hg) or more than 40.00 kPa (11.81 in.Hg).
  • Accumulated time that power supply mode of electric motor switch is ON is more than 27 minutes.
Judgment Criteria
  • The first reference pressure subtracted from the barometric pressure is more than 3.94 to 4.30 kPa (1.164 to 1.270 in.Hg) for 10 seconds.
  • The second reference pressure subtracted from the barometric pressure is more than 4.74 to 5.10 kPa (1.400 to 1.506 in.Hg) for 10 seconds.
  • The third reference pressure subtracted from the barometric pressure is more than 4.74 to 5.10 kPa (1.400 to 1.506 in.Hg) for 10 seconds.
noteThe threshold value varies depending on the canister pressure.
 
 
FAIL-SAFE AND BACKUP FUNCTION
None.
 
 
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function, OBD-II Drive Cycle – Pattern 4 OBD- II DRIVE CYCLE.
 
 
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
  • Excessive negative pressure of the evaporative emission leak detection pump
  • Reference orifice (built into the ELCM) blockage.
  • Short circuit or harness damage in evaporative emission leak detection pump circuit, or loose connector contact.
  • ECM failed.
 
 
DIAGNOSIS
Required Special Tools:
  • MB992744: Vehicle communication interface-Lite (V.C.I.-Lite)
  • MB992745: V.C.I.-Lite main harness A
  • MB992747: V.C.I.-Lite USB cable short
  • MB992748: V.C.I.-Lite USB cable long
1.STEP 1. Check harness between emission leak check module (ELCM) connector terminal number 2 and ECM connector terminal number 93.
Check output line for short to power supply.
Q: Is the check result normal?
Repair or replace the connector, or repair the damaged harness wire.
 
2.STEP 2. Using scan tool (M.U.T.-III SE) to check the data list, after replace ELCM and perform the evaporative emission system monitor test.
(1) Replace the ELCM (Refer to ENGINE, Engine, Motor and Emission Control – Emission Control – Evaporative Emission System EVAPORATIVE EMISSION CANISTER REMOVAL AND INSTALLATION).
(2) Perform the evaporative emission system monitor test (Refer to EVAPORATIVE EMISSION CONTROL SYSTEM MONITOR TEST).
(3) Use scan tool (M.U.T.-III SE) to check the data list (Refer to DATA LIST REFERENCE TABLE).
  • Item number 440: Reference orifice low flow NG
Q: Is the check result normal?
The inspection is complete.
Replace the ECM (Refer to ENGINE CONTROL MODULE (ECM) REMOVAL AND INSTALLATION).