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Chrysler 300/300 Touring/300C, Dodge Magnum. Manual - part 1021
5.
ECT SENSOR OPERATION
WARNING: Make sure the engine cooling system is cool before removing the pressure cap or any hose. The
cooling system is pressurized when hot. Failure to follow these instructions can result in personal injury
including extreme burns, scalding, or death.
With a scan tool, read and record the ECT Sensor Temperature value.
Use the DRB Temperature Probe #CH7050, or an equivalent temperature measuring tool, measure the engine cool-
ant temperature.
Is the ECT Sensor value with -15°C (5°F) of the temperature probe reading?
Yes
>> Go To 6
No
>> Go To 7
6.
OTHER POSSIBLE CAUSES
Inspect the Temperature Sensors for any physical damage.
Inspect the engine coolant. Make sure the coolant is at the proper level. Refer to the Service Information COOLING.
Make sure the Temperature Sensors are properly installed.
Make sure the CMP and CKP sensors are installed properly. Check the connectors for any signs of damage.
WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands
near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in
personal injury or death.
Refer to any Technical Service Bulletins (TSBs) that may apply.
With the engine running at normal operating temperature, monitor the Temperature sensor parameters while wig-
gling the wire harness. Look for parameter values to change.
Visually inspect the related wire harness. Look for any chafed, pierced, pinched, partially broken wires and broken,
bent, pushed out, or corroded terminals.
CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage
the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform
diagnosis.
Inspect and clean all PCM, engine, and chassis grounds.
Were any problems found during the above inspections?
Yes
>> Repair as necessary.
Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Test Complete.
7.
SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
NOTE: Visually inspect both the component and the PCM/FCM
connectors. Look for damage, partially broken wires and backed
out or corroded terminals
Turn the ignition off.
Disconnect the applicable Temperature Sensor harness connector.
Disconnect the applicable controller harness connectors.
Ignition on, engine not running.
Measure the voltage on the Signal circuit at the Temperature Sensor
harness connector.
Is voltage present?
Yes
>> Repair the short to battery voltage in the Signal circuit.
Perform the POWERTRAIN VERIFICATION TEST. (Refer
to 9 - ENGINE - STANDARD PROCEDURE)
No
>> Go To 8
9 - 108
ENGINE ELECTRICAL DIAGNOSTICS
LX