DTC P0116 (LDK with Turbocharger)
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DTC P0116 (LDK with Turbocharger)
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DTC P0116
Engine Coolant Temperature (ECT) Sensor Performance
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Diagnostic Fault Information
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Circuit
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Short to Ground
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High Resistance
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Open
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Short to Voltage
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Signal Performance
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ECT Sensor Signal
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P0117
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P0118
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P0118
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P0118
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P0116, P0119, P0128
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Low Reference
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-
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P0118
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P0118
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P0118
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P0119, P0128
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ECT Sensor Temperature
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Circuit
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Short to Ground
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Open
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Short to Voltage
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Operating Conditions:
Engine Running
Parameter Normal Range:
-39 to +120°C (-38 to +248°F)
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ECT Sensor
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143°C (289°F)
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-40°C (-40°F)
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-40°C (-40°F)
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Low Reference
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-
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-40°C (-40°F)
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-40°C (-40°F)
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Circuit/System Description
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The engine coolant temperature (ECT) sensor is a variable resistor that measures the temperature of the engine coolant. The engine control module (ECM) supplies 5V to the ECT sensor signal circuit and a ground for the low reference circuit.
The purpose of this diagnostic is to determine if the input from the ECT sensor is skewed warmer than normal. The internal clock of the ECM will record the amount of time the engine is OFF. If the required engine OFF time is met at start-up, the ECM will compare the temperature difference between the actual measured ECT and a calibrated ECT model. The information for this model is derived from the previous drive cycle and includes the accumulated mass air flow (MAF), the engine run time, the ambient air temperature and the ECT at the end of the drive cycle.
If the ECM detects that the temperature difference between the measured and modeled ECT is not within an acceptable operating range of each other, then the ECM will continue to run this diagnostic to determine if a block heater was active during the engine OFF time.
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Conditions for Running the DTC
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DTCs P0112, P0113, P0114, P0117, P0118, P0119, P0128, P0502, P0503, P0601, P1621, or P2610 are not set.
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The vehicle has had a minimum ignition OFF time of 8 hours.
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The start-up modeled ECT is colder than 50°C (+122°F).
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The previous accumulated MAF is greater than 6,000 grams.
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The previous engine run time is greater than 600 seconds.
OR
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The vehicle has had a minimum ignition OFF time of 8 hours.
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The previous ECT at engine shutdown is warmer than 75°C (+167°F).
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The previous accumulated MAF is greater than 6,000 grams.
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The previous engine run time is greater than 600 seconds.
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This DTC runs once per ignition cycle within the enabling conditions.
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Conditions for Setting the DTC
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P0116
The ECM detects a temperature difference at initial power-up that indicates that the actual measured ECT is 10°C (18°F) greater than the modeled ECT, and an active block heater has not been detected.
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Action Taken When the DTC Sets
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DTC P0116 is a Type B DTC.
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Conditions for Clearing the MIL/DTC
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DTC P0116 is a Type B DTC.
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Engine coolant that is leaking through the sensor will create a high resistance short to ground. This condition results in less voltage on the ECT sensor signal circuit, which is interpreted by the ECM as a warmer ECT.
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The ECM memory which includes the ignition OFF timer is maintained by battery power. If the ECM or the battery are disconnected for less than 15 seconds the proper operation of the ECM memory and the timer can be disrupted. Always disconnect these components for greater than 30 seconds.
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Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References
for scan tool information
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Circuit/System Verification
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1.
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Turn OFF the ignition.
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3.
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If the ignition has been OFF for 8 hours or greater, the intake air temperature (IAT) sensor, the IAT sensor 2, and the ECT sensor should be within 9°C (16°F) of each other and also the ambient temperature. Ignition ON, observe the scan tool IAT Sensor, IAT Sensor 2 and the ECT Sensor parameters. Compare those sensor parameters to each other and also to the ambient temperature to determine if the ECT sensor is skewed warmer.
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4.
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Engine running, observe the ECT Sensor parameter. The reading should be between -39 to +120°C (-38 to +248°F) depending on the current ambient temperature and the vehicle operating conditions.
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5.
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Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
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1.
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Ignition OFF for 90 seconds, disconnect the harness connector at the B34 ECT sensor.
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2.
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Inspect the ECT sensor terminals for corrosion and for engine coolant leaking through the sensor.
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3.
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Test for less than 5 Ω between the low reference circuit terminal A and ground.
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4.
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If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.
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5.
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Ignition ON, verify the scan tool ECT Sensor parameter is colder than -39°C (-38°F).
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6.
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If warmer than the specified range, test the signal circuit terminal B for a short to ground. If the circuit tests normal, replace the K20 ECM.
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7.
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Install a 3A fused jumper wire between the signal circuit terminal B and the low reference circuit terminal A. Verify the scan tool ECT Sensor parameter is warmer than 142°C (288°F).
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8.
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If colder than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K20 ECM.
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9.
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If the circuits test normal, test or replace the B34 ECT sensor.
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Measure and record the resistance of the ECT sensor at various ambient temperatures, then compare those measurements to the
Temperature Versus Resistance (IAT 2-LDK with Turbocharger)
Temperature Versus Resistance (ECT-LDK with Turbocharger)
Temperature Versus Resistance (IAT-LDK with Turbocharger)
table.
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
