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DTC P1469-62: Canister PRESS. SENS./manifold absolute PRESS. SENS. correlation
 
 
 
 
TECHNICAL DESCRIPTION
  • Canister pressure sensor is built into the Evaporative Leak Check Module (ELCM).
  • During the key-off evaporative leakage monitoring, compare the atmospheric pressures measured by the manifold absolute pressure sensor and canister pressure sensor, and when the difference is larger than the predetermined value, it is judged as a failure.
 
 
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 the 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 Criterion
  • Difference between manifold absolute pressure sensor output and canister pressure sensor output is more than specified value for 2 seconds.
 
 
FAIL-SAFE AND BACKUP FUNCTION
Indicates "REFUELING SYSTEM SERVICE REQUIRED" on the information screen in the multi-information display.
 
 
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:)
  • Canister pressure sensor (built into the ELCM) failed.
  • Manifold absolute pressure sensor failed.
  • Open or shorted canister pressure sensor circuit or connector damage.
  • 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. Using scan tool (M.U.T.-III SE), read the DTC.
Use scan tool (M.U.T.-III SE) to check and see if a DTC other than P1469-62 is set.
Q: Is DTC other than P1469-62 set?
Perform troubleshooting for the set DTC (Refer to DIAGNOSTIC TROUBLE CODE CHART).
 
2.STEP 2. Using scan tool (M.U.T.-III SE), check the data list.
Use scan tool (M.U.T.-III SE) to check the data list (Refer to DATA LIST REFERENCE TABLE).
  • Item number 860: EVAP System Leak Detection Pump Pressure Sensor
Q: Is the check result normal?
 
3.STEP 3. Perform voltage measurement at ELCM connector terminal number 7.
  • Disconnect connector, and measure at harness side.
  • Power supply mode of electric motor switch: ON
  • Voltage between ELCM connector terminal number 7 and ground.
OK: 4.9 to 5.1 volts.
Q: Is the check result normal?
Perform troubleshooting for the canister pressure sensor system (Refer to diagnostic trouble code procedure for DTC P24B9-00: Canister pressure sensor circuit performance DTC P24B9-00: Canister pressure sensor circuit performance, Refer to diagnostic trouble code procedure for DTC No. P24BA-00: EVAP System Leak Detection Pump Pressure Sensor Circuit Low DTC P24BA-00: EVAP System Leak Detection Pump Pressure Sensor Circuit Low, and Refer to diagnostic trouble code procedure for DTC P24BB-00: EVAP System Leak Detection Pump Pressure Sensor Circuit High DTC P24BB-00: EVAP System Leak Detection Pump Pressure Sensor Circuit High).
 
4.STEP 4. Check harness between ELCM connector terminal number 7 and ECM connector terminal number 97.
Check output line for open/short circuit.
Q: Is the check result normal?
Repair or replace the connector, or repair the damaged harness wire.
 
5.STEP 5. Using scan tool (M.U.T.-III SE), check the data list.
Use scan tool (M.U.T.-III SE) to check the data list (Refer to DATA LIST REFERENCE TABLE).
  • Item number 70: Boost Sensor
Q: Is the check result normal?
Perform troubleshooting for the manifold absolute pressure sensor system (Refer to diagnostic trouble code procedure for DTC P0107-00: Manifold Absolute Pressure Sensor circuit low input DTC P0107-00: Manifold Absolute Pressure Sensor circuit low input, and Refer to diagnostic trouble code procedure for DTC P0108-00: Manifold Absolute Pressure Sensor circuit high input DTC P0108-00: Manifold Absolute Pressure Sensor circuit high input).
 
6.STEP 6. Using scan tool (M.U.T.-III SE), check the data list after perform the evaporative emission system monitor test.
(1) Perform the evaporative emission system monitor test (Refer to EVAPORATIVE EMISSION CONTROL SYSTEM MONITOR TEST).
(2) Use scan tool (M.U.T.-III SE) to check the data list (Refer to DATA LIST REFERENCE TABLE).
  • Item number 500: Canister pressure sensor- MAPS correlation NG
Q: Is the check result normal?
The inspection is complete.
Replace the ECM (Refer to ENGINE CONTROL MODULE (ECM) REMOVAL AND INSTALLATION).