P0117
DTC P0117, P0118, or P0119 (LUW)
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructionsprovides an overview of each diagnostic category.
DTC Descriptors
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
Diagnostic Fault Information
Typical Scan Tool Data
Circuit/System Description
The engine coolant temperature (ECT) sensor is a variable resistor that measures the temperature of the engine coolant. The engine control module (ECM) supplies 5 V to the ECT 1 sensor signal circuit and a ground for the low reference circuit.
Conditions for Running the DTC
P0117 and P0118
* The ignition is ON, or the engine is running for 10 s.
* The battery voltage is greater than 9 V.
* The intake air temperature (IAT) is warmer than -8°C (19.4°F).
* This DTC runs continuously within the enabling conditions.
P0119
* The ignition is ON, or the engine is running.
* The battery voltage is greater than 9 V.
* DTC P0117 or P0118 are not set.
Conditions for Setting the DTC
P0117
The ECM detects that the ECT sensor 1 signal is less than 0.27 V, which is warmer than 137°C (279°F) for greater than 1 s.
P0118
The ECM detects that the ECT sensor 1 signal is greater than 4.96 V, which is colder than -39°C (-38°F) for greater than 10 s.
P0119
he ECM detects that the ECT sensor 1 signal has abruptly changed by a minimum of 5°C (9°F), warmer or colder for greater than 1 s.
Action Taken When the DTC Sets
* DTCs P0117, P0118 and P0119 are Type B DTCs
* The cooling fans will be commanded ON.
* The A/C compressor will be commanded OFF.
Conditions for Clearing the DTC
DTCs P0117, P0118 and P0119 are Type B DTCs
Reference Information
Schematic Reference
Engine Controls Schematics (LUW) [1][2]Electrical Diagrams
Connector End View Reference
Component Connector End Views Sunshade - Left (D6I)
Description and Operation
Cooling System Description and Operation (LDE, LLU, LXV, 2H0 LUW and LFH) Description and OperationCooling System Description and Operation (1.4L LUH, LUJ, and LUV) Description and Operation
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References Control Module Referencesfor scan tool information
Circuit/System Verification
1. If the ignition has been OFF for 8 h or greater, the IAT, the ambient air temperature, and the ECT should be within 9°C (16°F) of each other. Ignition ON, observe the scan tool IAT Sensor, Ambient Air Temperature, and the ECT Sensor 1 parameters. Compare those sensor parameters to each other to determine if the condition is current.
2. Engine running, observe the scan tool ECT Sensor 1 parameter. The reading should be between -40 to +140°C (-40 to +284°F) depending on the current Ambient Air Temperature, the engine run time, and the vehicle operating conditions.
3. 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.
Circuit/System Testing
1. Ignition OFF, disconnect the harness connector at the B34A Engine Coolant Temperature Sensor 1.
2. Ignition OFF, test for less than 5 ohm between the low reference circuit terminal 2 and ground.
• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
3. Ignition ON, verify the scan tool ECT Sensor 1 is at -40°C (-40°F).
• If warmer than the specified range, test the signal circuit terminal 1 for a short to ground. If the circuit tests normal, replace the K20 Engine Control Module.
4. Install a 3 A fused jumper wire between the signal circuit terminal 1 and the low reference circuit terminal 2. Verify the scan tool ECT Sensor 1 is at 140°C (284°F).
• 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 Engine Control Module.
5. If all circuits test normal, test or replace the B34A Engine Coolant Temperature Sensor 1.
Component Testing
Static Test
1. Ignition OFF, disconnect the harness connector at the B34A Engine Coolant Temperature Sensor 1.
2. Test the B34A Engine Coolant Temperature Sensor 1 by varying the sensor temperature while monitoring the sensor resistance. Compare the readings with the Temperature Versus Resistance (IAT) Temperature Versus Resistance (IAT) table and verify that the resistance is within 5% of the specification.
• If not within the specified range, replace the B34A Engine Coolant Temperature Sensor 1.
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.
* Engine Coolant Temperature Sensor Replacement - Radiator Side Engine Coolant Temperature Sensor Replacement - Radiator Side
* Engine Coolant Temperature Sensor Replacement - Thermostat Side (1.6L LDE, LXV, and 1.8L 2H0) Engine Coolant Temperature Sensor Replacement - Thermostat Side
* Control Module References Control Module Referencesfor ECM replacement, programming, and setup.