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P0116

DTC    P0116    Engine Coolant Temperature Circuit Range / Performance Problem


 

DESCRIPTION

Refer to DTC P0115.
 

DTC No. DTC Detection Condition Trouble Area
P0116 When either of the following conditions is met (2 trip detection logic):
  1. During engine warm up after cold engine starts, change in engine coolant temperature sensor output is below threshold
  2. In duration between warmed engine stopped and next cold engine starts, change in engine coolant temperature sensor output below threshold
  1. Water inlet with thermostat sub-assembly
  2. Engine coolant temperature sensor


 

MONITOR DESCRIPTION

  1. Engine Coolant Temperature Sensor Cold Start Monitor
    The monitor runs when the engine is started cold. If the change in engine coolant temperature sensor output until the engine warmed up completely is less than the threshold, it is determined that a malfunction has occurred in the engine coolant temperature sensor. When this is detected in 2 consecutive driving cycles, the MIL is illuminated and the DTC is set.
  1. Engine Coolant Temperature Sensor Soak Monitor
    The ECM compares the engine coolant temperature when the warmed engine is stopped and when the engine is started on the next trip when more than 5 hours has elapsed since the engine was stopped. If the change in engine coolant temperature sensor output is less than the threshold, it is determined that a malfunction has occurred in the engine coolant temperature sensor. When this is detected in 2 consecutive driving cycles, the MIL is illuminated and the DTC is set.

 

MONITOR STRATEGY

 

Frequency of Operation Once per driving cycle

 

CONFIRMATION DRIVING PATTERN


P0116 / Lexus CT200h / ZWA10

 

  1. Connect the intelligent tester to the DLC3.
  2. Turn the power switch on (IG) and turn the tester on.
  3. Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Coolant Temp.
  4. Check that the engine coolant temperature is 60°C (140°F) or less.
  5. Clear the DTCs (even if no DTCs are stored, perform the clear DTC operation).
  6. Turn the power switch off and wait for 30 seconds.
  7. Turn the power switch on (IG) and turn the tester on [A].
  8. Put the engine in inspection mode (maintenance mode).
  9. Start the engine and idle it for 5 minutes or more [B].

    HINT:

    If the engine coolant temperature does not change by 5°C (9°F) or higher, the engine coolant temperature sensor is malfunctioning. It is not necessary to continue this procedure.

     

  10. Enter the following menus: Powertrain / Engine and ECT / DTC / Pending.
  11. Read the pending DTC [C].

    HINT:

    1. If a pending DTC is output, the system is malfunctioning.
    2. If a pending DTC is not output, perform the following procedure.

     

  12. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
  13. Input the DTC: P0116.
  14. Check the DTC judgment result.
     
    Tester Display Description
    NORMAL
    1. DTC judgment completed
    2. System normal
    ABNORMAL
    1. DTC judgment completed
    2. System abnormal
    INCOMPLETE
    1. DTC judgment not completed
    2. Perform driving pattern after confirming DTC enabling conditions
    UNKNOWN
    1. Unable to perform DTC judgment
    2. Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    HINT:

    1. If the judgment result shows NORMAL, the system is normal.
    2. If the judgment result shows ABNORMAL, the system has a malfunction.
    3. If the judgment result shows INCOMPLETE or UNKNOWN, perform steps [D] and [E].

     

  15. Drive the vehicle at 40 km/h (25 mph) or more for a total of 5 minutes or more [D].

    CAUTION:

    When performing the confirmation driving pattern, obey all speed limits and traffic laws.

    HINT:

    In the event of the drive pattern being interrupted (possibly due to factors such as traffic conditions), the drive pattern can be resumed.

     

  16. Check the DTC judgment result again [E].

    HINT:

    1. If the judgment result shows NORMAL, the system is normal.
    2. If the judgment result shows ABNORMAL, the system has a malfunction.

     

 

INSPECTION PROCEDURE

HINT:

  1. If any of DTCs P0115, P0117 or P0118 is set simultaneously with DTC P0116, the engine coolant temperature sensor may have an open or a short circuit. Troubleshoot those DTCs first.
  2. Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can be helpful in determining whether the vehicle was running or stopped, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.
1.CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0116)
  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (IG).

  1. Turn the tester on.

  1. Enter the following menus: Powertrain / Engine and ECT / DTC.

  1. Read the DTCs.

    Result 
    Result Proceed to
    DTC P0116 is output A
    DTC P0116 and other DTCs are output B

    HINT:

    If any DTCs other than P0116 are output, troubleshoot those DTCs first.
  B
GO TO DTC CHART
 
A  
 

 

2.INSPECT WATER INLET WITH THERMOSTAT SUB-ASSEMBLY
  1. Remove the water inlet with thermostat sub-assembly.

  1. Measure the valve opening temperature of the water inlet with thermostat sub-assembly.

    Standard value:

    80 to 84°C (176 to 183°F)

    HINT:

    In addition to the above check, confirm that the valve is completely closed when the temperature is below the standard.
  NG
REPLACE WATER INLET WITH THERMOSTAT SUB-ASSEMBLY
 
OK  
 
REPLACE ENGINE COOLANT TEMPERATURE SENSOR