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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 |
---|---|---|---|---|
Coolant Temperature Sensor Signal | P00B3 | P00B4 | P00B4* | P00B6 |
Low Reference | - | P00B4 | P00B4* | P00B6 |
* 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 Running in Closed Loop Parameter Normal Range: Varies with ambient temperature | |||
Radiator Coolant Temperature Sensor Signal | 140°C (284°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 engine control module (ECM) monitors the temperature of the engine radiator coolant. The ECM controls the thermostat with a pulse width modulated (PWM) signal. The ECM compares the radiator coolant temperature to the engine coolant temperature in order to determine if there sufficient coolant flow through the thermostat.
• | DTCs P00B3, P00B4, P00B6, P0116, P0117, and P0118 are not set. |
• | The engine run time is greater than 45 s. |
OR |
• | The engine coolant temperature is greater than 70°C (158°F). |
• | The DTC runs continuously when the above conditions are met. |
Note: The scan tool display range is between -40 and + 150°C (-40 and +302°F).
The ECM detects the difference between the RCT sensor and the ECT sensor is greater than 45°C (81°F) when the ECT sensor is warmer than 117°C (242°F) for greater than 5 s.
DTC P00B7 is a Type B DTC.
DTC P00B7 is a Type B DTC.
• | The thermostat has a mechanical fail-safe in case of an electrical condition with the thermostat heater. The mechanical thermostat will open at approximately 80°C (176°F). The mechanical thermostat will cycle from approximately 85°C (185°F) to approximately 102°C (215°F). |
• | A resistance condition in the RCT sensor circuits may cause this DTC. This condition results in a greater voltage on the RCT sensor signal circuit, which is interpreted by the ECM as a colder RCT. |
Hybrid Modes of Operation Description
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
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 minutes for the temperature to decrease less than the specified value.
• | Weak coolant solution |
• | Obstructed radiator air flow or bent radiator fins |
• | Blocked cooling system passages |
• | Radiator hoses that are restricted, collapsed, or deteriorated |
• | Damaged water pump and or belt |
• | Loss of cooling system pressure |
- | Leaking surge tank cap |
- | Radiator hoses |
• | Cylinder head or an engine block that is cracked or plugged |
⇒ | If you find any of the above conditions, repair as necessary. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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