Chrysler 2005 Crossfire SRT6 Service Manual page 2042

9 - 118 ENGINE - ELECTRICAL DIAGNOSTICS
(P0128) THERMOSTAT RATIONALITY (CONTINUED)
4.
THERMOSTAT OPERATION
Note: This test works best if performed on a cold engine (cold
soak).
With the ignition on.
With the DRB III , read the ENG COOLANT TEMP value. If the
engine was allowed to sit overnight (cold soak), the temperature value
should be a sensible value that is somewhere close to the ambient
temperature.
Note: If engine coolant temperature is above 82°C (180°F), allow
the engine to cool until 65°C (150°F) is reached.
Start the Engine.
During engine warm-up, monitor the ENG COOLANT TEMP value.
The temperature degree value change should be a smooth transition
from start up to normal operating temp 82°C (180°F). Also monitor the
actual coolant temperature with a thermometer.
Note: As the engine warms up to operating temperature, the actual coolant temperature (thermometer read-
ing) and the ENG COOLANT TEMP value in the DRB III should stay relatively close to each other.
Using the appropriate service information, determine the proper opening temperature of the thermostat.
Did the thermostat open at the proper temperature?
Yes >> Go To 5
No >> Replace the Thermostat. (Refer to 7 - COOLING/ENGINE/ENGINE COOLANT THERMOSTAT -
REMOVAL).
Perform POWERTRAIN VERIFICATION TEST - VER 2.
5.
INTAKE AIR TEMP SENSOR OPERATION
With the ignition on.
With the DRB III , read and record the AIR INTAKE TEMP value
Using the DRB III Temperature Probe #CH7050, measure the ambi-
ent air temperature near the IAT sensor.
Is the AIR INTAKE TEMP value within 3°C (5°F) of the tempera-
ture probe reading?
Yes >> Go To 6
No >> Go To 8
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