Chrysler 2005 Crossfire SRT6 Service Manual page 4157

24 - 28 HEATING & AIR CONDITIONING - ELECTRICAL DIAGNOSTICS
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.
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
Turn the ignition on.
With the DRB III , read the Engine Coolant Temperature Sensor volt-
age.
Does the DRB III 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
POSSIBLE CAUSES
ZH