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DTC P04FA-00: EGR control temperature too high
 
 
 
 
CIRCUIT OPERATION
  • A power voltage of 5 volts is applied to the EGR temperature sensor connector terminal number 1 from the ECM connector terminal number 48.
  • The power voltage is grounded to the ECM connector terminal number 58 from the EGR temperature sensor connector terminal number 2.
 
 
TECHNICAL DESCRIPTION
  • The ECM monitors the output voltage of the EGR temperature sensor.
  • The ECM judges whether the EGR temperature sensor signal voltage is within the normal operation parameters.
 
 
DESCRIPTIONS OF MONITOR METHODS
The EGR temperature sensor is a kind of resistor that features a reduction in resistance when the exhaust gas temperature rises. Therefore, the sensor output voltage changes according to the exhaust gas temperature. When exhaust gas temperature rises, it lowers.
 
 
MONITOR EXECUTION
Continuous.
 
 
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)
Other Monitor (There is no temporary DTC set in memory for the item monitored below)
  • Not applicable
Sensor (The sensor below is determined to be normal)
  • Not applicable
 
 
DTC SET CONDITIONS
Logic Flow Chart
Check Conditions
  • More than 2 seconds have passed since the power supply mode of the electric motor switch was ON.
  • While engine is running.
  • 12V battery positive voltage is 10.0 volts or higher.
Judgment Criterion
  • EGR gas temperature sensor is more than 200°C (392°F) for 5 seconds.
 
 
FAIL-SAFE AND BACKUP FUNCTION
  • Output suppression by PHEV-ECU.
  • Stop EGR control.
 
 
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function, OBD-II Drive Cycle – Pattern 1 OBD- II DRIVE CYCLE.
 
 
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
  • EGR valve failed.
  • EGR temperature sensor failed.
  • Harness damage in EGR temperature sensor 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. 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 P040C-00 or P040D-00 is set.
Q: Is DTC P040C-00 or P040D-00 set?
Perform troubleshooting for the EGR temperature sensor circuit [Refer to DTC P040C-00: EGR temperature sensor circuit Low DTC P040C-00: EGR temperature sensor circuit Low), and Refer to DTC P040D-00: EGR temperature sensor circuit High DTC P040D-00: EGR temperature sensor circuit High)].
 
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 950: EGR Gas Temperature
Q: Is the check result normal?
 
3.STEP 3. Check EGR valve itself.
Check EGR valve itself [Refer to ENGINE, Engine, Motor and Emission Control – Emission Control – Exhaust Gas Recirculation (EGR) System EXHAUST GAS RECIRCULATION (EGR) VALVE (STEPPER MOTOR) CHECK].
Q: Is the check result normal?
Replace the EGR valve [Refer to ENGINE, Engine, Motor and Emission Control – Emission Control – Exhaust Gas Recirculation (EGR) System EXHAUST GAS RECIRCULATION (EGR) VALVE REMOVAL AND INSTALLATION].
 
4.STEP 4. Check EGR temperature sensor itself.
Check EGR temperature sensor itself [Refer to ENGINE, Engine, Motor and Emission Control – Emission Control – Exhaust Gas Recirculation (EGR) System EXHAUST GAS RECIRCULATION (EGR) VALVE (STEPPER MOTOR) CHECK].
Q: Is the check result normal?
Replace the EGR temperature sensor [Refer to ENGINE, Engine, Motor and Emission Control – Emission Control – Exhaust Gas Recirculation (EGR) System EXHAUST GAS RECIRCULATION (EGR) VALVE REMOVAL AND INSTALLATION].
 
5.STEP 5. Test the OBD-II drive cycle.
After erasing the DTC, carry out test drive with the drive cycle pattern, and recheck the DTC.
(1) Use scan tool (M.U.T.-III SE) to erase the DTC.
(2) Carry out test drive with the drive cycle pattern (Refer to Diagnostic Function, OBD-II Drive Cycle – Pattern 1 OBD- II DRIVE CYCLE).
(3) Use scan tool (M.U.T.-III SE) to recheck the DTC.
Q: Is DTC No. P04FA-00 set?
Replace the ECM (Refer to ENGINE CONTROL MODULE (ECM) REMOVAL AND INSTALLATION).
Intermittent malfunction (Refer to GENERAL INFORMATION, General Information – How to Use Troubleshooting/Inspection Service Points – How to Cope with Intermittent Malfunctions HOW TO COPE WITH INTERMITTENT MALFUNCTIONS).