DTC P0117 or P0118 (LLU)
| DTC P0117 or P0118 (LLU) |
| Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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| DTC Descriptor |
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 |
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
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Signal Circuit
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P0117 00
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P0118 00
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P0113 00
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P0116 00
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Low Reference
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-
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P0118 00
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P0113 00
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-
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| Typical Scan Tool Data |
ECT Sensor
| Circuit | Short to Ground | Open | 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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Signal Circuit
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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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* Internal ECM or sensor damage may occur if the circuit is shorted to B+.
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| 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 sensor signal circuit and a ground for the low reference circuit.
| Conditions for Running the DTC |
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The ignition is ON.
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These DTCs runs continuously within the enabling conditions.
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| Conditions for Setting the DTC |
P0117 00
The ECM detects that the ECT is warmer than 138°C (280°F) for greater than 2 s.P0118 00
The ECM detects that the ECT is colder than -39°C (-38°F) for greater than 2 s.| Action Taken When the DTC Sets |
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DTCs P0117 00, and P0118 00 are Type B DTCs.
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The cooling fan will be commanded ON.
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The air condition compressor will be commanded OFF.
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| Conditions for Clearing the DTC |
DTCs P0117 00, and P0118 00 are Type B DTCs.
| Reference Information |
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
| Circuit/System Verification |
| 1. |
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. |
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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| Circuit/System Testing |
| 1. |
Ignition OFF, disconnect the harness connector at the B34A Engine Coolant Temperature Sensor 1.
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| 2. |
Ignition OFF for 90 s, test for less than 5 Ω between the low reference circuit terminal 2 and ground.
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| 3. |
If greater than the specified range, test the ground circuit for an open/high resistance.
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| 4. |
Ignition ON, verify the scan tool ECT Sensor parameter is colder than -39°C (-38°F).
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| 5. |
If greater 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.
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| 6. |
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 parameter is warmer than 142°C (288°F).
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| 7. |
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.
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| 8. |
If all circuits/connections test normal, replace the B34A Engine Coolant Temperature Sensor 1.
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| Component Testing |
Static Test
Measure and record the resistance of the B34A Engine Coolant Temperature Sensor 1 at various ambient temperatures, then compare those measurements to the Temperature Versus Resistance table.| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Engine Coolant Temperature Sensor Replacement (Thermostat Housing)
Engine Coolant Temperature Sensor Replacement (Radiator)
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Control Module References
for ECM replacement, setup, and programming
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