Chrysler Crossfire. Manual — part 978
RIGHT HEATER CORE TEMPERATURE SENSOR CIRCUIT
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HEATING & AIR CONDITIONING - ELECTRICAL DIAGNOSTICS
24 - 15
RIGHT HEATER CORE TEMPERATURE SENSOR CIRCUIT (CONTINUED)
When Monitored and Set Condition
•
When Monitored: With the ignition on.
•
Set Condition: The A/C Heater Control Module detects an abnormally high or low voltage on the Right Heater
Core Temperature Sensor Signal circuit.
POSSIBLE CAUSES
RIGHT HEATER CORE TEMPERATURE SENSOR SIGNAL CIRCUIT SHORT TO VOLTAGE
RIGHT HEATER CORE TEMPERATURE SENSOR OPEN
RIGHT HEATER CORE TEMPERATURE SENSOR SIGNAL CIRCUIT OPEN
RIGHT HEATER CORE TEMPERATURE SENSOR GROUND OPEN
RIGHT HEATER CORE TEMPERATURE SENSOR SIGNAL CIRCUIT SHORT TO GROUND
A/C HEATER CONTROL MODULE
For a complete HVAC Circuit Diagram, (Refer to 24 - HEATING & AIR CONDITIONING - SCHEMATICS AND DIA-
GRAMS).
Diagnostic Test
1.
READ RIGHT HEATER CORE TEMPERATURE SENSOR VOLTAGE WITH DRB III
T
Turn the ignition on.
With the DRB III
T
, read the Right Heater Core Temperature Sensor
voltage.
Does the DRB III
T
display Right HEATER CORE TEMP: 5.0
VOLTS or greater?
Yes
>> Go to 2
No
>> Go to 6
2.
MEASURE THE VOLTAGE OF THE RIGHT HEATER CORE TEMPERATURE SENSOR SIGNAL CIRCUIT
Turn the ignition off.
Disconnect the Heater Core Temperature Sensor harness connector.
Note: Check connector - Clean/repair as necessary.
Turn the ignition on.
Measure the voltage of the Right Heater Core Temperature Sensor
Signal circuit at the Heater Core Temperature Sensor harness connec-
tor.
Is the voltage above 5.5 volts?
Yes
>> Repair the Right Heater Core Temperature Sensor Signal
circuit for a short to voltage.
Perform BODY VERIFICATION TEST.
No
>> Go to 3
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HEATING & AIR CONDITIONING - ELECTRICAL DIAGNOSTICS
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RIGHT HEATER CORE TEMPERATURE SENSOR CIRCUIT (CONTINUED)
3.
READ RIGHT HEATER CORE TEMPERATURE SENSOR VOLTAGE WITH DRB III
T
Turn the ignition off.
Connect a jumper wire between the Right Heater Core Temperature
Sensor Signal circuit and the Sensor Ground circuit.
Turn the ignition on.
With the DRB III
T
, read the Right Heater Core Temperature Sensor
voltage.
Does the DRB III
T
display RIGHT HEATER CORE TEMP: 4.5
VOLTS or greater?
Yes
>> Go to 4
No
>> Replace the Heater Core Temperature Sensor. (Refer to
24 - HEATING & AIR CONDITIONING/CONTROLS/TEM-
PERATURE SENSOR - REMOVAL).
Perform BODY VERIFICATION TEST.
4.
MEASURE THE RESISTANCE OF THE RIGHT HEATER CORE TEMPERATURE SENSOR SIGNAL CIRCUIT
Turn the ignition off.
Disconnect the A/C Heater Control Module harness connector.
Note: Check connector - Clean/repair as necessary.
Measure the resistance of the Right Heater Core Temperature Sensor
Signal circuit from the A/C Heater Control Module harness connector
to the Heater Core Temperature Sensor harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Go to 5
No
>> Repair the Right Heater Core Temperature Sensor Signal
circuit for an open.
Perform BODY VERIFICATION TEST.
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HEATING & AIR CONDITIONING - ELECTRICAL DIAGNOSTICS
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RIGHT HEATER CORE 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 A/C
Heater Control Module harness connector to the Heater Core Temper-
ature Sensor harness connector.
Is the resistance below 5.0 ohms?
Yes
>> Replace the A/C Heater Control Module. (Refer to 24 -
HEATING & AIR CONDITIONING/CONTROLS/HEATER
CONTROL - REMOVAL).
Perform BODY VERIFICATION TEST.
No
>> Repair the Sensor Ground circuit for an open.
Perform BODY VERIFICATION TEST.
6.
READ RIGHT HEATER CORE TEMPERATURE SENSOR VOLTAGE WITH DRB III
T
Turn the ignition off.
Disconnect the Heater Core Temperature Sensor harness connector.
Note: Check connector - Clean/repair as necessary.
Turn the ignition on.
With the DRB III
T
, read the Right Heater Core Temperature Sensor
voltage.
Does the DRB III
T
display RIGHT HEATER CORE 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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