Chrysler PT Cruiser 2001 Service Manual Supplement page 2621

Symptom:
P1299-VACUUM LEAK FOUND (IAC FULLY SEATED)
When Monitored and Set Condition:
P1299-VACUUM LEAK FOUND (IAC FULLY SEATED)
When Monitored: With the engine running.
Set Condition: The MAP sensor signal does not correlate to the TPS signal.
VACUUM LEAK
MAP SENSOR (OUT OF CALIBRATION)
TPS DEFECTIVE (VOLTAGE GREATER THAN 1.5 AT REST)
TPS DEFECTIVE (VOLTAGE LESS THAN 3.4 AT WIDE OPEN THROTTLE)
PCM
TEST
1 Note: A large vacuum leak is the most likely cause of this DTC.
Inspect the Intake Manifold for vacuum leaks.
Inspect the Power Brake Booster for any vacuum leaks.
Inspect the PCV system for proper operation or any vacuum leaks.
Were any problems found?
Yes → Repair vacuum leak as necessary.
→ Go To 2
No
2 Note: Throttle must be fully closed and against throttle stop.
Turn the ignition on.
With the DRB in Sensors, read the Throttle Position Sensor voltage.
Is the voltage 1.5 volts or less with the throttle closed?
Yes → Go To 3
→ Replace the Throttle Position Sensor.
No
3 Turn the ignition off.
Tee-in a vacuum gauge to a manifold vacuum source.
Start the engine and allow to idle.
Note: If the engine will not idle, maintain a constant RPM above idle.
With the DRB in Sensors, read the MAP Sensor Vacuum value.
Is the DRB reading within 1 of the teed-in vacuum gauge?
Yes → Go To 4
→ Replace the MAP Sensor.
No
POSSIBLE CAUSES
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
DRIVEABILITY - GAS
161
APPLICABILITY
All
All
All