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DTC P0116 (KA/Kc)

DTC P0116:  Engine Coolant Temperature (ECT) Sensor 1 Circuit Range/Performance Problem

General Description 

GHH433991Courtesy of HONDA, U.S.A., INC.

The powertrain control module (PCM) supplies voltage to the engine coolant temperature signal circuit (about 5 V) through a pull-up resistor. As the engine coolant cools, the engine coolant temperature (ECT) sensor 1 resistance increases, and the PCM detects a high signal voltage. As the engine coolant warms, the ECT sensor 1 resistance decreases, and the PCM detects a low signal voltage. If the ECT sensor 1 output voltage does not reach a set temperature after starting the engine and driving a set time, or when the difference between the ECT sensor 1 output voltage while driving and the output voltage of ECT sensor 1 after the engine has been stopped a certain length of time does not change a certain amount, the PCM detects a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type 

Execution Once per driving cycle
Sequence None
Duration 24 minutes or more* 130 minutes or more* 2
DTC Type Two drive cycles, MIL on

*1: M/T model

*2: CVT model

Enable Conditions 

Condition Minimum Maximum
Elapsed time after starting the engine 10 seconds -
Fuel feedback Other than during fuel cut-off operation
Other* 1 With a completely cooled engine (one that has been off for at least 6 hours): Judgment is made after the engine has run for at least 24 minutes or been driven at least 3 miles (4 km) turn the vehicle to the OFF (LOCK) mode and leave the vehicle for at least 10 seconds, then start and run again for at least 10 seconds.
With a partially cooled engine (one that has been off for less than 6 hours): Judgment is made after the engine has run for at least 24 minutes or been driven at least 3 miles (4 km), turn the vehicle to the OFF (LOCK) mode and leave the vehicle for at least 6 hours then start and run again for at least 10 seconds.
Other* 2 With a completely cooled engine (one that has been off for at least 6 hours): Judgment is made after the engine has run for at least 30 minutes or been driven at least 4 miles (5 km) turn the vehicle to the OFF (LOCK) mode and leave the vehicle for at least 10 seconds, then start and run again for at least 10 seconds.
With a partially cooled engine (one that has been off for less than 6 hours): Judgment is made after the engine has run for at least 30 minutes or been driven at least 4 miles (5 km), turn the vehicle to the OFF (LOCK) mode and leave the vehicle for at least 6 hours then start and run again for at least 10 seconds.

Malfunction Threshold (M/T Model) 

Malfunction determination 1:

With a completely cooled engine (one that has been off for at least 6 hours):

When the change in coolant temperature after 24 minutes or more of running time or 3 miles (4 km) or more of driving distance is 50 deg. F (10 deg. C) or less, a malfunction is detected.

Malfunction determination 2:

With a partially cooled engine (one that has been off for less than 6 hours):

When the difference between the coolant temperature after 24 minutes or more of running time or 3 miles (4 km) or more of driving distance the coolant temperature after the engine has been off for 6 hours and then run for 10 seconds is 50 deg. F (10 deg. C) or less, a malfunction is detected.

Malfunction Threshold (CVT Model) 

Malfunction determination 1:

With a completely cooled engine (one that has been off for at least 6 hours):

When the change in coolant temperature after 30 minutes or more of running time or 4 miles (5 km) or more of driving distance is 50 deg. F (10 deg. C) or less, a malfunction is detected.

Malfunction determination 2:

With a partially cooled engine (one that has been off for less than 6 hours):

When the difference between the coolant temperature after 30 minutes or more of running time or 4 miles (5 km) or more of driving distance the coolant temperature after the engine has been off for 6 hours and then run for 10 seconds is 50 deg. F (10 deg. C) or less, a malfunction is detected.

Possible Cause 

NOTE:  The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.

Confirmation Procedure (M/T Model) 

Operating Condition 

With a completely cooled engine (one that has been off for at least 6 hours).

With a partially cooled engine (one that has been off for less than 6 hours).

With the HDS 

None.

Confirmation Procedure (CVT Model) 

Operating Condition 

With a completely cooled engine (one that has been off for at least 6 hours).

With a partially cooled engine (one that has been off for less than 6 hours).

With the HDS 

None.

Diagnosis Details 

Conditions for setting the DTC 

When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on and a Confirmed DTC and the freeze data are stored.

Conditions for clearing the DTC 

The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the 12 volt battery.

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