DTC P0117, P0118, or P0119
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DTC P0117, P0118, or P0119
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DTC P0117
Engine Coolant Temperature (ECT) Sensor Circuit Low Voltage
DTC P0118
Engine Coolant Temperature (ECT) Sensor Circuit High Voltage
DTC P0119
Engine Coolant Temperature (ECT) Sensor Circuit Intermittent
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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, P0128, P0119
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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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P0128, P0119
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ECT Sensor
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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.
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Conditions for Running the DTCs
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The ignition is ON or the engine is running.
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These DTCs run continuously within the enabling conditions.
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Conditions for Setting the DTC
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P0117
The ECM detects that the ECT is warmer than 142°C (288°F) for greater than 4 seconds.
P0118
The ECM detects that the ECT is colder than -39°C (-38°F) for greater than 4 seconds.
P0119
The ECM detects that the ECT is intermittent or has abruptly changed for greater than 4 seconds.
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Action Taken When the DTC Sets
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DTCs P0117, P0118 and P0119 are Type B DTCs.
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The cooling fans will be commanded ON.
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The AC compressor will be commanded OFF.
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Conditions for Clearing the MIL/DTC
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DTCs P0117, P0118 and P0119 are Type B DTCs.
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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Ignition ON, 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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2.
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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, disconnect the harness connector at the B34 ECT sensor.
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2.
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Ignition Off and all vehicle systems off. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 Ω between the low reference circuit terminal A and ground.
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3.
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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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4.
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Ignition ON, verify the scan tool ECT Sensor parameter is colder than -39°C (-38°F).
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5.
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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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6.
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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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7.
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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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8.
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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)
Temperature Versus Resistance (ECT)
Temperature Versus Resistance (IAT)
table.
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
