Chrysler 300M 2002 Service Manual page 2462

P0068-MANIFOLD PRESSURE/THROTTLE POSITION CORRELATION -
HIGH FLOW/VACUUM LEAK DETECTED —
TEST
1 NOTE: Diagnose any TPS or MAP Sensor component DTCs before continu-
ing.
NOTE: If the P0501 - No Vehicle Speed Signal is set long with this DTC, refer
to the P0500 diagnostics before continuing.
NOTE: The throttle plate and linkage should be free from binding and
carbon build up.
NOTE: Ensure the throttle plate is at the idle position.
Ignition on, engine not running.
With the DRBIII , read DTCs and record the related Freeze Frame data.
Is the Good Trip Counter displayed and equal to zero?
Yes → Go To 2
→ Go To 19
No
2 NOTE: This code is enabled on engines with a plastic intake manifold and is
intended to shut down the engine if a large crack occurs.
NOTE: A large vacuum leak is most likely the cause of this DTC.
Inspect the Intake Manifold for leaks and cracks.
Inspect the Power Brake Booster for any vacuum leaks.
Inspect the PCV system for proper operation or any vacuum leaks.
Were any vacuum leaks found?
Yes → Repair the vacuum leak as necessary.
→ Go To 3
No
3 Start the engine.
With the DRBIII , monitor the MAP Sensor voltage.
Snap the throttle.
Does the MAP Sensor voltage vary from below 2.0 volts at idle to above 3.5 volts at
WOT?
Yes → Go To 4
→ Go To 12
No
4 Ignition on, engine not running.
With the DRBIII , monitor the TPS voltage while slowly depressing the throttle
pedal from the idle position to the wide open throttle position.
Does voltage start approximately at 0.8 of a volt and go above 3.5 volts with a smooth
transition?
Yes → Go To 19
→ Go To 5
No
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 5.
DRIVEABILITY - NGC
Continued
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APPLICABILITY
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