Chrysler 2005 Crossfire SRT6 Service Manual page 2170

9 - 246 ENGINE - ELECTRICAL DIAGNOSTICS
(P0172) FUEL SYSTEM 1/1 LEAN CONTROL BELOW LIMIT (AT LOAD) (CONTINUED)
7.
ECT SENSOR OPERATION
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)
Turn the ignition on.
With the DRB III , read the Engine Coolant Temperature (ECT) Sen-
sor 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 ECT Sensor value. The tempera-
ture value change should be a smooth transition from start up to normal operating temperature 82°C (180°F). The
value should reach at least 82°C (180°F).
Did the Engine Coolant Temperature value increase with a smooth transition and did it reach at least 82°C
(180°F)?
Yes >> Go To 8
No >> Replace the Engine Coolant Temperature Sensor. (Refer to 7 - COOLING/ENGINE/ENGINE COOLANT
TEMP SENSOR - REMOVAL).
Perform POWERTRAIN VERIFICATION TEST - VER 2.
8.
ENGINE MECHANICAL PROBLEM
Check for any of the following conditions/mechanical problems.
AIR INDUCTION SYSTEM - must be free from leaks.
ENGINE VACUUM - must be at least 440 mbar (13 in. Hg) in neutral
ENGINE VALVE TIMING - must be within specifications
ENGINE COMPRESSION - must be within specifications
ENGINE EXHAUST SYSTEM - must be free of any restrictions or leaks.
ENGINE CRANKCASE VENT SYSTEM - must flow freely
TORQUE CONVERTER STALL SPEED - must be within specifications
POWER BRAKE BOOSTER - must not have any internal vacuum leaks.
FUEL - must be free of contamination
FUEL INJECTOR - must not be plugged or restricted; harness connectors must be connected to the correct injec-
tors.
Are there any engine mechanical problems?
Yes >> Repair as necessary.
Perform POWERTRAIN VERIFICATION TEST - VER 2.
No >> Go To 13
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