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P0117




DTC P0117 or P0118

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 Instructions)provides an overview of each diagnostic category.

DTC Descriptors
DTC P0117 00
- Engine Coolant Temperature (ECT) Sensor Circuit Low Voltage

DTC P0118 00
- Engine Coolant Temperature (ECT) Sensor Circuit High Voltage

Diagnostic Fault Information





Typical Scan Tool Data





Circuit/System Description

The engine coolant temperature (ECT) sensor 1 is a variable resistor that measures the temperature of the engine coolant. The engine control module (ECM) supplies 5 V to the engine coolant temperature (ECT) sensor 1 signal circuit and a ground for the low reference circuit.

The following table illustrates the difference between temperature, resistance, and voltage:





Conditions for Running the DTC

P0117 00
* The ignition is ON, or the engine is running.
* The battery voltage is greater than 9 V.
* The DTC runs continuously when the above conditions are met.

P0118 00
* The engine run time is greater than 60 s.
* The intake air temperature (IAT) sensor is greater than 0°C (32°F).
* The DTC runs continuously when the above conditions are met.

Conditions for Setting the DTC

P0117 00

The ECM detects that the engine coolant temperature (ECT) sensor 1 signal is less than 0.27 V, which is warmer than 137°C (279°F) for greater than 2 s.

P0118 00

The ECM detects that the engine coolant temperature (ECT) sensor 1 signal is greater than 4.96 V, which is colder than -39°C (-38°F) for greater than 2 s.

Action Taken When the DTC Sets

* DTCs P0117 00, and P0118 00 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 00, and P0118 00 are Type B DTCs.

Diagnostic Aids

Note: The engine coolant temperature (ECT) sensor 1 is mounted on the engine and the engine coolant temperature (ECT) sensor 2, radiator coolant temperature (RCT) sensor, is mounted on the radiator.

* The engine coolant temperature gauge will display full cold when an ECT DTC sets.
* After starting the engine, the engine coolant temperature (ECT) sensor 1 temperature should rise steadily, then stabilize after the thermostat opens.
* Test the engine coolant temperature (ECT) sensor 1 at various temperature levels in order to evaluate the possibility of a skewed sensor. A skewed sensor can result in a driveability condition.

Reference Information
Schematic Reference

Engine Controls Schematics ([1][2]Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector End Views By Name)
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 (Programming and Relearning)for scan tool information

Circuit/System Verification

1. If the ignition has been OFF for 8 h or greater, the intake air temperature, ambient air temperature, and the engine coolant temperature (ECT) sensor 1 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 ECT Sensor 1 parameter. The reading should be between -39 to +120°C (-38 to +248°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 value, test the signal circuit terminal 1 for a short to ground. If the circuit tests normal, replace the K20 Engine Control Module.

Note: If the fuse in the jumper wire opens, the signal circuit is shorted to a voltage and the sensor may be damaged.

4. Install a 3 A fused jumper wire between the engine coolant temperature (ECT) sensor 1 signal circuit terminal 1 and ground. Verify the scan tool ECT Sensor 1 is greater than 130°C (266°F).

• If less 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 (Temperature Versus Resistance) 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) (Engine Coolant Temperature Sensor Replacement (Radiator))Engine Coolant Temperature Sensor Replacement (Thermostat) (Engine Coolant Temperature Sensor Replacement (Thermostat))Engine Coolant Temperature Sensor Replacement (Water Outlet) (Engine Coolant Temperature Sensor Replacement (Water Outlet))
* Control Module References (Programming and Relearning)for ECM replacement, setup, and programming

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