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DTC P011B: Engine Coolant Temperature /Intake Air Temperature Correlation
 
 
 
 
CIRCUIT OPERATION
Refer to DTC P0111 - Intake Air Temperature Circuit Range/Performance Problem (sensor 1) , DTC P0116 - Engine Coolant Temperature Circuit Range/Performance Problem .
 
 
TECHNICAL DESCRIPTION
Refer to DTC P0111 - Intake Air Temperature Circuit Range/Performance Problem (sensor 1) , DTC P0116 - Engine Coolant Temperature Circuit Range/Performance Problem .
 
 
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)
  • Fuel tank temperature sensor monitor
Sensor (The sensor below is determined to be normal)
  • Mass airflow sensor
  • Engine coolant temperature sensor
  • Intake air temperature sensor 1
 
 
DTC SET CONDITIONS
Logic Flow Chart
 
 
Check Conditions
  • The engine coolant temperature is higher than 78°C (172°F) engine stop in previous Drive Cycle <Up to 18 Model year>
  • The engine coolant temperature is higher than 77°C (171°F) engine stop in previous Drive Cycle <From 19 Model year>
  • The engine coolant temperature - fuel tank temperature is between -5°C (23°F) and 5°C (41°F) when the ignition on.
  • Battery positive voltage is higher than 10 volts.
Judgment Criterion
  • The engine coolant temperature - intake air temperature is less than -30°C (-22°F) or higher than 50°C (122°F) when the ignition on.
note
  • Monitoring stops when the fuel tank temperature at ignition on - fuel tank temperature* is 3°C (37°F) or more.
  • *: Fuel tank temperature until 600 seconds accumulated with vehicle speed 40 km/h (25 mph) or more.
 
 
FAIL-SAFE AND BACKUP FUNCTION
  • None.
 
 
OBD-II DRIVE CYCLE PATTERN
  • Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 5 .
 
 
TROUBLESHOOTING HINTS (The most likely causes for this code to be set are:)
  • Engine coolant temperature sensor failed.
  • Engine coolant temperature sensor circuit harness damage, or connector damage.
  • Intake air temperature sensor 1 failed.
  • Intake air temperature sensor 1 circuit harness damage, or connector damage.
  • ECM failed.
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-IIISE), check data list item 5: Intake Air Temperature Sensor 1.
cautionTo prevent damage to scan tool (M.U.T.-IIISE), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-IIISE).
(1) Connect scan tool (M.U.T.-IIISE). Refer to HOW TO CONNECT THE SCAN TOOL (M.U.T.-IIISE) .
(2) Remove the mass airflow sensor from the air cleaner cover.
(3) Turn the ignition switch to the "ON" position.
(4) Set scan tool (M.U.T.-IIISE) to the data reading mode for item 5, Intake Air Temperature Sensor 1.
(5) Heating the sensor using a hair drier.
  • The indicated temperature increases.
    noteDo not allow it to increase over 80°C (176°F).
(6) Turn the ignition switch to the "LOCK" (OFF) position.
(7) Attach the mass airflow sensor.
Is the sensor operating properly?
Go to Step 2.
Refer to DTC P0111 - Intake Air Temperature Circuit Range/Performance Problem (sensor 1) .
 
STEP 2. Using scan tool (M.U.T.-IIISE), check data list item 6: Engine Coolant Temperature Sensor.
(1) Turn the ignition switch to the "ON" position.
(2) Set scan tool (M.U.T.-IIISE) to the data reading mode for item 6, Engine Coolant Temperature Sensor.
  • The engine coolant temperature and temperature shown with the scan tool should approximately match.
(3) Turn the ignition switch to the "LOCK" (OFF) position.
Is the sensor operating properly?
Go to Step 3.
Refer to DTC P0116 - Engine Coolant Temperature Circuit Range/Performance Problem .
 
STEP 3. Check the trouble symptoms.
(1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 5 .
(2) Check the diagnostic trouble code (DTC).
Is DTC P011B set?
Replace the ECM (Refer to Removal and Installation ). Then go to Step 4.
It can be assumed that this malfunction is intermittent. Refer to GROUP 00, How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions .
 
STEP 4. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 5 .
(2) Check the diagnostic trouble code (DTC).
Is DTC P011B set?
Retry the troubleshooting.
The inspection is complete.