Dodge ZB 2005 Service Manual page 1176

P0125-CLOSED LOOP TEMP NOT REACHED —
TEST
3 Note: This test works best if performed on a cold engine (cold soak)
Ignition on, engine not running.
With the DRBIII , read the Eng Coolant Tmp Deg 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 Tmp Deg value. The temp deg
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 reading) and the Eng Coolant Tmp Deg in the
DRBIII values should stay relatively close to each other.
Using the appropriate service information, determine the proper opening tempera-
ture of the thermostat.
Did the thermostat open at the proper temperature?
Yes → Go To 4
→ Replace the thermostat.
No
4 Note: For this test to be valid, the thermostat must be operating correctly.
Note: This test works best if performed on a cold engine (cold soak)
Ignition on, engine not running.
With the DRBIII in sensors, read the Eng Coolant Tmp Deg 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 surrounding temperature (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 Tmp Deg value. The temp deg
value change should be a smooth transition from start up to normal operating temp
82°C (180°F). The value should reach at least 82°C (180°F).
Was the Eng Coolant Tmp Deg value increase a smooth transition and did it reach at
least 180°?
Yes → Test Complete.
→ Replace the Engine Coolant Temperature Sensor.
No
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
DRIVEABILITY - GAS
Continued
55
APPLICABILITY
All
All