Chrysler 2005 Crossfire SRT6 Service Manual page 2041

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(P0128) THERMOSTAT RATIONALITY (CONTINUED)
2.
CHECK FOR CURRENT DTC
Note: If any ECT, CMP, IAT or CKP sensor DTCs have set along
with P0128, diagnose them first before continuing.
Note: If the PCM detects and stores a DTC, the PCM also stores
the engine/vehicle operating conditions under which the DTC was
set. Some of these conditions are displayed on the DRB III at the
same time the DTC is displayed.
Note: Before erasing stored DTCs, record these conditions.
Attempting to duplicate these conditions may assist when check-
ing for an active DTC.
Turn the ignition on.
With the DRB III , erase PCM DTCs.
Note: It maybe necessary to road test the vehicle for this DTC to
set.
With the DRB III , read PCM DTCs.
Did this DTC set again?
Yes >> Go To 3
No >> Go To 15
3.
CHECKING THE COOLANT LEVEL AND CONDITION
WARNING: NEVER OPEN THE COOLING SYSTEM WHEN THE ENGINE IS HOT. THE SYSTEM IS UNDER
PRESSURE. EXTREME BURNS OR SCALDING MAY RESULT. ALLOW THE ENGINE TO COOL BEFORE
OPENING THE COOLING SYSTEM.
Note: If an Engine Coolant Temperature (ECT) DTC is set along with this code, diagnose the ECT DTC first.
Note: Inspect the ECT terminals and related PCM terminals. Ensure the terminals are free from corrosion
and damage.
Note: The best way to diagnose this DTC is to allow the vehicle to sit overnight outside in order to have a
totally cold soaked engine.
Note: Extremely cold outside ambient temperatures may have caused this DTC to set.
Check the coolant level and condition.
Is the coolant level and condition OK?
Yes >> Go To 4
No >> Locate and repair any coolant leaks and add the necessary amount of coolant. (Refer to 7 - COOLING/
ENGINE/COOLANT - STANDARD PROCEDURE).
Perform POWERTRAIN VERIFICATION TEST - VER 2.
ENGINE - ELECTRICAL DIAGNOSTICS 9 - 117