Chrysler 2005 Crossfire SRT6 Service Manual page 4303

25 - 10 EMISSIONS CONTROL
THROTTLE BODY AIR FLOW
The PCM cannot detect a clogged or restricted air cleaner inlet or filter element.
VACUUM ASSIST
The PCM cannot detect leaks or restrictions in the vacuum circuits of vacuum assisted engine control system
devices or vacuum assisted accessories. However, these could cause the PCM to store a MAP sensor diagnostic
trouble code and cause a high idle condition.
PCM SYSTEM GROUND
The PCM cannot determine a poor system ground. However, one or more diagnostic trouble codes may be gener-
ated as a result of this condition.
PCM CONNECTOR ENGAGEMENT
The PCM may not be able to determine spread or damaged connector pins. However, it might store diagnostic
trouble codes as a result of pins not making good contact.
DESCRIPTION - DRB III STATE DISPLAY TEST MODE
The switch (component) inputs to the Powertrain Control Module (PCM) have two recognized states; HIGH and
LOW. The PCM cannot recognize the difference between a selected switch position versus an open circuit, a short
circuit or a defective switch. If the State Display screen shows the change from HIGH to LOW or LOW to HIGH,
assume the entire switch circuit to the PCM functions properly. From the state display screen, access either State
Display Inputs and Outputs or State Display Sensors.
DESCRIPTION - HIGH AND LOW LIMITS
The PCM compares input signal voltages from each input device with established high and low limits for the device.
If the input voltage is not within limits and other criteria are met, the PCM stores a diagnostic trouble code in mem-
ory. Other diagnostic trouble code criteria might include engine RPM limits or input voltages from other sensors or
switches that must be present before verifying a diagnostic trouble code condition.
DESCRIPTION - TRIP DEFINITION
A "Trip" means vehicle operation (following an engine-off period) of duration and driving mode such that all com-
ponents and systems are monitored at least once by the diagnostic system. The monitors must successfully pass
before the PCM can verify that a previously malfunctioning component is meeting the normal operating conditions of
that component. For misfire or fuel system malfunction, the MIL may be extinguished if the fault does not recur
when monitored during three subsequent sequential driving cycles in which conditions are similar to those under
which the malfunction was first determined.
Anytime the MIL is illuminated, a DTC is stored. The DTC can self erase only after the MIL has been extinguished.
Once the MIL is extinguished, the PCM must pass the diagnostic test for the most recent DTC for 40 warm-up
cycles (80 warm-up cycles for the Fuel System Monitor and the Misfire Monitor). A warm-up cycle can best be
described by the following:
• The engine must be running
• A rise of 4.4°C (40°F) in engine temperature must occur from the time engine was started
• Engine coolant temperature must crossover 71°C (160°F)
• A "driving cycle" that consists of engine start up and engine shut off.
Once the above conditions occur, the PCM is considered to have passed a warm-up cycle. Due to the conditions
required to extinguish the MIL and erase the DTC, it is most important that after a repair has been made, all DTCs
be erased and the repair verified by running 1 good trip.
DESCRIPTION - VEHICLE EMISSION CONTROL INFORMATION LABEL
All models have a Vehicle Emission Control Information (VECI) Label. DaimlerChrysler permanently attaches the
label in the engine compartment. It cannot be removed without defacing information and destroying the label.
The label contains the vehicle's emission specifications and vacuum hose routings. All hoses must be connected
and routed according to the label.
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