Chrysler Crossfire. Manual — part 982
ENGINE COOLANT TEMPERATURE SENSOR CIRCUIT (CONTINUED)
7.
READ A/C HEATER CONTROL MODULE DTC’S WITH DRB III
T
Turn the ignition off.
Reconnect the Engine Coolant 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 an Engine Coolant Temperature Sen-
sor Failure DTC?
Yes
>> Replace the Engine Coolant Temperature Sensor. (Refer
to 7 - COOLING/ENGINE/ENGINE COOLANT TEMP
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 Engine Coolant Temperature Sensor is connected at this
time.
Start the engine.
Turn the A/C system on and run for at least five minutes.
With the DRB III
T
, read A/C Heater Control Module DTC’s.
Does the DRB III
T
display an Engine Coolant Temperature Sen-
sor Failure DTC?
Yes
>> Replace the Engine Coolant Temperature Sensor. (Refer
to 7 - COOLING/ENGINE/ENGINE COOLANT TEMP
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.
9.
MEASURE THE RESISTANCE BETWEEN GROUND AND 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 between ground and the Engine Coolant Tem-
perature Signal circuit at the Powertrain Control Module connector.
Is the resistance below 1000.0 ohms?
Yes
>> Repair the Engine Coolant Temperature Sensor Signal cir-
cuit for a short to ground.
Perform BODY VERIFICATION TEST.
No
>> Go to 10
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HEATING & AIR CONDITIONING - ELECTRICAL DIAGNOSTICS
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ENGINE COOLANT TEMPERATURE SENSOR CIRCUIT (CONTINUED)
10.
MEASURE THE RESISTANCE FROM THE ENGINE COOLANT TEMPERATURE SENSOR SIGNAL
CIRCUIT TO THE SENSOR GROUND CIRCUIT
With the ignition off.
Measure the resistance from the Engine Coolant Temperature Sensor
Signal circuit to the Sensor Ground circuit at the Engine Coolant Tem-
perature Sensor harness connector.
Is the resistance below 1000.0 ohms?
Yes
>> Repair the Engine Coolant Temperature Sensor Signal cir-
cuit for a short to the Sensor Ground circuit.
Perform BODY VERIFICATION TEST.
No
>> Replace the Powertrain Control Module. (Refer to 8 -
ELECTRICAL/ELECTRONIC CONTROL MODULES/POW-
ERTRAIN CONTROL MODULE - REMOVAL).
Perform BODY VERIFICATION TEST.
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HEATING & AIR CONDITIONING - ELECTRICAL DIAGNOSTICS
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A/C PRESSURE SENSOR CIRCUIT
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HEATING & AIR CONDITIONING - ELECTRICAL DIAGNOSTICS
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A/C PRESSURE SENSOR CIRCUIT (CONTINUED)
When Monitored and Set Condition
•
When Monitored: Engine Running with the A/C on.
•
Set Condition: The A/C Heater Control Module detects an abnormally high or low voltage on the A/C Pressure
Sensor Signal circuit.
POSSIBLE CAUSES
A/C PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
A/C PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO 5-VOLT SUPPLY CIRCUIT
A/C PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND
A/C PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO SENSOR GROUND CIRCUIT
A/C PRESSURE SENSOR 5-VOLT SUPPLY CIRCUIT OPEN
A/C PRESSURE SENSOR 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
A/C PRESSURE SENSOR
A/C PRESSURE SENSOR SIGNAL CIRCUIT OPEN
A/C PRESSURE SENSOR GROUND CIRCUIT OPEN
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 A/C PRESSURE SENSOR VOLTAGE WITH DRB III
T
Note: Ensure the A/C refrigerant system is properly charged to
specifications.
Turn the ignition on.
With the DRB III
T
, read the A/C Pressure Sensor voltage.
Is the voltage above 4.5 volts?
Yes
>> Go to 2
No
>> Go to 7
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HEATING & AIR CONDITIONING - ELECTRICAL DIAGNOSTICS
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