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DTC P040B-00: EGR temperature sensor circuit performance
 
 
 
 
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
EGR temperature sensor voltage signal does not change when specified EGR cut / inducement operations are repeated.
 
 
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)
  • EGR temperature sensor
 
 
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.
  • Continuous EGR cut for specified time.
  • Continuous EGR inducement for specified time.
Judgment Criterion
  • EGR gas temperature change is lower than 2°C (36°F).
 
 
FAIL-SAFE AND BACKUP FUNCTION
None.
 
 
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 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 set DTC [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 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].
 
4.STEP 4. 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 P040B-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).