Chrysler Crossfire. Manual — part 981
ENGINE COOLANT TEMPERATURE SENSOR CIRCUIT
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HEATING & AIR CONDITIONING - ELECTRICAL DIAGNOSTICS
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ENGINE COOLANT TEMPERATURE SENSOR CIRCUIT (CONTINUED)
When Monitored and Set Condition
•
When Monitored: With the ignition on.
•
Set Condition: The A/C Heater Control Module reports an abnormally high or low voltage that is detected by
the Instrument Cluster. The abnormal condition is at the Powertrain Control Module (PCM) on the Engine Cool-
ant Temperature Sensor Signal circuit. The abnormal condition is communicated from the PCM to the Instru-
ment Cluster by the CAN bus.
POSSIBLE CAUSES
ENGINE COOLANT TEMPERATURE SENSOR SIGNAL CIRCUIT SHORT TO VOLTAGE
ENGINE COOLANT TEMPERATURE SENSOR OPEN
ENGINE COOLANT TEMPERATURE SENSOR SIGNAL CIRCUIT OPEN
ENGINE COOLANT TEMPERATURE SENSOR GROUND OPEN
ENGINE COOLANT TEMPERATURE SENSOR SIGNAL CIRCUIT SHORT TO GROUND
POWERTRAIN CONTROL MODULE
For a complete HVAC Circuit Diagram, (Refer to 24 - HEATING & AIR CONDITIONING - SCHEMATICS AND DIA-
GRAMS).
Diagnostic Test
1.
READ ENGINE COOLANT TEMPERATURE SENSOR VOLTAGE WITH DRB III
T
Turn the ignition on.
With the DRB III
T
, read the Engine Coolant Temperature Sensor volt-
age.
Does the DRB III
T
display ENGINE COOLANT TEMP: 5.0 VOLTS
or greater?
Yes
>> Go to 2
No
>> Go to 6
2.
MEASURE THE VOLTAGE OF THE ENGINE COOLANT TEMPERATURE SENSOR SIGNAL CIRCUIT
Turn the ignition off.
Disconnect the Engine Coolant Temperature Sensor harness connec-
tor.
Note: Check connector - Clean/repair as necessary.
Turn the ignition on.
Measure the voltage of the Engine Coolant Temperature Sensor Signal
Circuit at the Engine Coolant Temperature Sensor harness connector.
Is the voltage above 5.5 volts?
Yes
>> Repair the Engine Coolant Temperature Sensor Signal cir-
cuit for a short to voltage.
Perform BODY VERIFICATION TEST.
No
>> Go to 3
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ENGINE COOLANT TEMPERATURE SENSOR CIRCUIT (CONTINUED)
3.
READ ENGINE COOLANT TEMPERATURE SENSOR VOLTAGE WITH DRB III
T
Turn the ignition off.
Connect a jumper wire between the Engine Coolant Temperature Sen-
sor Signal circuit and the Sensor Ground circuit.
Turn the ignition on.
With the DRB III
T
, read the Engine Coolant Temperature Sensor volt-
age.
Does the DRB III
T
display ENGINE COOLANT TEMP: 4.5 VOLTS
or greater?
Yes
>> Go to 4
No
>> Replace the Engine Coolant Temperature Sensor. (Refer
to 7 - COOLING/ENGINE/ENGINE COOLANT TEMP
SENSOR - REMOVAL).
Perform BODY VERIFICATION TEST.
4.
MEASURE THE RESISTANCE OF THE ENGINE COOLANT TEMPERATURE SENSOR SIGNAL CIRCUIT
Turn the ignition off.
Disconnect the Powertrain Control Module harness connector.
Note: Check connector - Clean/repair as necessary.
Measure the resistance of the Engine Coolant Temperature Sensor
Signal circuit from the Powertrain Control Module harness connector to
the Engine Coolant Temperature Sensor harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Go to 5
No
>> Repair the Engine Coolant Temperature Sensor Signal cir-
cuit for an open.
Perform BODY VERIFICATION TEST.
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ENGINE COOLANT TEMPERATURE SENSOR CIRCUIT (CONTINUED)
5.
MEASURE THE RESISTANCE OF THE SENSOR GROUND CIRCUIT
With the ignition off.
Measure the resistance of the Sensor Ground circuit from the Power-
train Control Module harness connector to the Engine Coolant Temper-
ature Sensor harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Replace the Powertrain Control Module. (Refer to 8 -
ELECTRICAL/ELECTRONIC CONTROL MODULES/POW-
ERTRAIN CONTROL MODULE - REMOVAL).
Perform BODY VERIFICATION TEST.
No
>> Repair the Sensor Ground circuit for an open.
Perform BODY VERIFICATION TEST.
6.
READ ENGINE COOLANT TEMPERATURE SENSOR VOLTAGE WITH DRB III
T
Turn the ignition off.
Disconnect the Engine Coolant Temperature Sensor harness connec-
tor.
Note: Check connector - Clean/repair as necessary.
Turn the ignition on.
With the DRB III
T
, read the Engine Coolant Temperature Sensor volt-
age.
Does the DRB III
T
display ENGINE COOLANT TEMP: 4.5 VOLTS
or greater?
Yes
>> Go to 7
No
>> Go to 9
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HEATING & AIR CONDITIONING - ELECTRICAL DIAGNOSTICS
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