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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 |
|---|---|---|---|---|
RCT Sensor Signal | P00B3 00 | P00B4 00 | P00B4 00* | P00B6 00 |
Low Reference | - | P00B4 00 | P00B4 00* | P00B6 00 |
*Engine control module (ECM) or sensor damage may occur if the circuit is shorted to B+ | ||||
Circuit | Short to Ground | Open | Short to Voltage |
|---|---|---|---|
Operating Conditions: The ignition is ON, or the engine is running Parameter Normal Range: Varies with ambient temperature, within a range of -39 to +120°C (-38 to +248°F) | |||
RCT Sensor Signal | 150°C (302°F) | -40°C (-40°F) | -40°C (-40°F)* |
Low Reference | - | -40°C (-40°F) | -40°C -40°F)* |
* Internal ECM or sensor damage may occur if the circuit is shorted to B+. | |||
The radiator coolant temperature (RCT) sensor is a variable resistor that measures the temperature of the radiator coolant. The ECM supplies 5 V to the RCT sensor signal circuit and supplies an ground for the low reference circuit.
The following table illustrates the difference between temperature, resistance, and voltage:
RCT | RCT Resistance | RCT Signal Voltage |
|---|---|---|
Cold | High | High |
Warm | Low | Low |
| • | DTCsP00B3 00, P00B4 00, P0112 00, P0113 00, P0117 00, or P0118 00 are not set. |
| • | The ignition has been off for longer than 8 hours before vehicle is started. |
| • | The ignition is ON or the engine is running. |
| • | The inlet air temperature (IAT) is greater than -7°C (19°F). |
| • | The fuel level is greater than 10%. |
| • | The DTC runs once per ignition cycle when the above conditions are met. |
This DTC sets if one of the following conditions occurs for less than 1 s:
| • | The ECM detects the RCT sensor and the ECT sensor are greater than a predetermined inlet air temperature at engine start-up. |
| • | The ECM detects the RCT sensor is 20°C (68°F) warmer than the ECT sensor at engine start-up and the block heater has not been detected. |
| • | The ECM detects the RCT sensor is 20°C (68°F) warmer than the ECT sensor at engine start-up and the engine has been cranking for greater than 10 s without a fuel level sensor DTC. |
DTC P00B6 00 is a Type B DTC.
DTC P00B6 00 is a Type B DTC.
| • | If the vehicle has sat overnight, the RCT sensor and the ECT sensor values should display within 3°C (5°F). |
| • | As the thermostat opens, the RCT sensor temperature should rise steadily, then stabilise once the thermostat opens completely. |
| • | Test the RCT sensor at various temperature levels in order to evaluate the possibility of a skewed sensor. |
| • | Inspect for the correct operation of the engine cooling system and verify the correct coolant level. |
| • | If the condition is intermittent, allowing the vehicle to sit for longer than 8 h with the ignition OFF, may help isolate the condition. Compare the scan tool RCT and ECT temperature sensor values at Ignition ON. The RCT sensor and the ECT sensor values should display within 3°C (5°F). |
Cooling System Description and Operation : 2.0L Diesel LNP → 1.4L LDD and LUJ → 2.0L Diesel LLW
Control Module References for scan tool information
| ⇒ | If a DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis. |
Note: Depending on ambient temperature, it may take up to 4 min for the temperatures to equalise.
| ⇒ | 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 1 for a short to ground. If the circuit tests normal, replace 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.
| ⇒ | If less than 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. |
Note: A thermometer can be used to the used to test the sensor off the vehicle.
| • | Temperature Versus Resistance for the LUJ engine |
| ⇒ | If not within the specified range, replace the B34B Engine Coolant Temperature Sensor 2. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for ECM replacement, setup and programming
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