Chrysler Crossfire. Manual — part 977
LEFT HEATER CORE TEMPERATURE SENSOR CIRCUIT (CONTINUED)
3.
READ LEFT HEATER CORE TEMPERATURE SENSOR VOLTAGE WITH DRB III
Turn the ignition off.
Connect a jumper wire between the Left Heater Core Temperature
Sensor Signal circuit and the Sensor Ground circuit.
Turn the ignition on.
With the DRB III
T
, read the Left Heater Core Temperature Sensor volt-
age.
Does the DRB III
T
display LEFT 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 LEFT 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 Left 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 Left Heater Core Temperature Sensor Signal
circuit for an open.
Perform BODY VERIFICATION TEST.
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HEATING & AIR CONDITIONING - ELECTRICAL DIAGNOSTICS
24 - 11
LEFT 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 LEFT 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 Left Heater Core Temperature Sensor volt-
age.
Does the DRB III
T
display LEFT 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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LEFT HEATER CORE TEMPERATURE SENSOR CIRCUIT (CONTINUED)
7.
READ A/C HEATER CONTROL MODULE DTC’S WITH DRB III
T
Turn the ignition off.
Reconnect the Heater Core Temperature Sensor connector.
Turn the ignition on.
With the DRB III
T
, read A/C Heater Control Module DTC’s.
Wait two minutes.
With the DRB III
T
, read A/C Heater Control Module DTC’s.
Does the DRB III
T
display Left Heater Core Temperature Sensor
Failure DTC?
Yes
>> Replace the Heater Core Temperature Sensor. (Refer to
24 - HEATING & AIR CONDITIONING/CONTROLS/TEM-
PERATURE SENSOR - REMOVAL)
Perform BODY VERIFICATION TEST.
No
>> Go to 8
8.
READ A/C HEATER CONTROL MODULE DTC’S WITH DRB III
T
Ensure the Heater Core Temperature Sensor is connected at this time.
Start the engine.
Turn the A/C system on.
With the DRB III
T
, read A/C Heater Control Module DTC’s.
Does the DRB III
T
display Left Heater Core Temperature Sensor
Failure DTC?
Yes
>> Replace the Heater Core Temperature Sensor. (Refer to
24 - HEATING & AIR CONDITIONING/CONTROLS/TEM-
PERATURE SENSOR - REMOVAL)
Perform BODY VERIFICATION TEST.
No
>> The condition that caused this DTC to set is currently not
present. Inspect the related wiring harness for a possible
intermittent condition.
Perform BODY VERIFICATION TEST.
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HEATING & AIR CONDITIONING - ELECTRICAL DIAGNOSTICS
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LEFT HEATER CORE TEMPERATURE SENSOR CIRCUIT (CONTINUED)
9.
MEASURE THE RESISTANCE BETWEEN GROUND AND THE LEFT 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 between ground and the Left Heater Core
Temperature Signal circuit.
Is the resistance below 1000.0 ohms?
Yes
>> Repair the Left Heater Core Temperature Sensor Signal
circuit for a short to ground.
Perform BODY VERIFICATION TEST.
No
>> Go to 10
10.
MEASURE THE RESISTANCE FROM THE LEFT HEATER CORE TEMPERATURE SENSOR SIGNAL
CIRCUIT TO THE SENSOR GROUND CIRCUIT
With the ignition off.
Measure the resistance from the Left Heater Core Temperature Sensor
Signal circuit to the Sensor Ground circuit at the Heater Core Temper-
ature Sensor connector.
Is the resistance below 1000.0 ohms?
Yes
>> Repair the Left Heater Core Temperature Sensor Signal
circuit for a short to the Sensor Ground circuit.
Perform BODY VERIFICATION TEST.
No
>> Replace the A/C Heater Control Module. (Refer to 24 -
HEATING & AIR CONDITIONING/CONTROLS/HEATER
CONTROL - REMOVAL)
Perform BODY VERIFICATION TEST.
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HEATING & AIR CONDITIONING - ELECTRICAL DIAGNOSTICS
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