• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | High Resistance | Open | Short to Voltage | Signal Performance |
---|---|---|---|---|---|
ECT Sensor Signal | P0117 | P0118 | P0118 | P0118 | P0116, P0128 |
Low Reference | -- | P0118 | P0118 | P0118 | P0128 |
Circuit | Short to Ground | Open | Short to Voltage |
---|---|---|---|
Operating Conditions: Engine running at various operating conditions Parameter Normal Range: Varies with coolant temperature | |||
ECT Sensor | 150°C (302°F) | -40°C (-40°F) | -40°C (-40°F) |
Low Reference | -- | -40°C (-40°F) | -40°C (-40°F) |
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 ignition is ON. |
OR |
• | The engine is running for greater than 10 seconds. |
OR |
• | The engine run time is less than 10 seconds when the intake air temperature (IAT) is colder than 50°C (122°F). |
• | This DTC runs continuously within the enabling conditions. |
• | The ignition is ON. |
OR |
• | The engine is running for greater than 10 seconds. |
OR |
• | The engine run time is less than 10 seconds when the IAT is warmer than 0°C (32°F). |
• | This DTC runs continuously within the enabling conditions. |
The ECM detects that the ECT is warmer than 149°C (300°F) for greater than 5 seconds.
The ECM detects that the ECT is colder than -39°C (-38°F) for greater than 5 seconds.
DTCs P0117 and P0118 are Type B DTCs.
DTCs P0117 and P0118 are Type B DTCs.
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
⇒ | 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. |
⇒ | 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. |
⇒ | 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. |
Measure and record the resistance of the ECT sensor at various ambient temperatures, then compare those measurements to the Temperature Versus Resistance table.
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for ECM replacement, setup, and programming |