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| • | 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 | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Signal | P0117 00 | P0116 00, P0118 00, P0119 00 | P0118 00, P0119 00* | P0116 00* |
Low Reference | - | P0118 00 | - | P0116 00, P0119 00* |
* Internal ECM or sensor damage may occur if the circuit is shorted to B+ | ||||
Circuit | Short to Ground | Open | Short to Voltage |
|---|---|---|---|
Operating Conditions: Engine operating in Closed Loop. Parameter Normal Range: -39 to +139°C (-38 to +282°F) Varies with coolant temperature. | |||
Signal | 139°C (282°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 5 V to the ECT signal circuit and supplies an ground to the low reference circuit.
The following table illustrates the difference between temperature, resistance, and voltage:
ECT | ECT Resistance | ECT Signal Voltage |
|---|---|---|
Cold | High | High |
Warm | Low | Low |
| • | The ignition is ON. |
| • | The engine speed is greater than 1 000 RPM. |
| • | These DTCs run continuously once the above conditions are met. |
The ECM detects the ECT voltage is not plausible.
The ECM detects the ECT voltage is below the threshold.
The ECM detects the ECT voltage is above the threshold.
The ECM detects that the ECT changed ±5°C (±9°F) greater than the expected value during a calibrated amount of time.
DTCs P0116 00, P0117 00, P0118 00 and P0119 00 are Type B DTCs.
DTCs P0116 00, P0117 00, P0118 00 and P0119 00 are Type B DTCs.
| • | Test the ECT sensor at various temperature levels in order to evaluate the possibility of a skewed sensor. A skewed sensor can result in a DTC or a driveability condition. Refer to Temperature Versus Resistance : Exhaust Temperature Sensor → ECT and IAT Sensor . |
| • | If the engine has sat overnight, the inlet air temperature (IAT) sensor and the ECT sensor values should display within 3°C (5°F). |
| • | After starting a cold engine, the ECT sensor temperature should rise steadily, then stabilise after the thermostat opens. |
| • | High resistance in the circuits of either the ECT or IAT sensor may set a DTC. |
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 Engine Control Module. |
| ⇒ | If greater than the specified range, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the K20 Engine Control Module. |
Caution: If the fuse in the jumper wire opens, the signal circuit may have a short to a voltage or a short to ground and the sensor might be damaged.
| ⇒ | 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. |
| ⇒ | If not within the specified range, replace the B34 Engine Coolant Temperature Sensor. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for ECM replacement, programming and setup |
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