Chrysler PT Cruiser 2001 Service Manual Supplement page 2619

P1297-NO CHANGE IN MAP FROM START TO RUN —
TEST
3 Turn the ignition off.
Disconnect the MAP Sensor harness connector.
Disconnect the Powertrain Control Module harness connector.
Measure the resistance of the MAP Sensor 5-Volt Supply Circuit between the MAP
Sensor harness connector to the PCM harness connector.
Is the resistance below 5.0 ohms?
Yes → Go To 4
→ Repair the 5-volt supply circuit for an open.
No
4 Turn the ignition off.
Remove the MAP Sensor and inspect condition of vacuum port.
Inspect condition of Intake Manifold or Throttle Body vacuum port.
Was there a restriction?
Yes → Remove the restriction and reinstall the MAP Sensor.
→ Go To 5
No
5 If there are no possible causes remaining, view repair.
Repair
6 Start the engine.
With the DRB, set the engine speed to 1500 RPM.
With the engine RPM at 1500, read MAP Sensor voltage.
While monitoring the voltage, wiggle the wiring from the MAP Sensor to PCM.
Did the engine stall or voltage become erratic?
Yes → Repair the Wiring or Connector defect between the MAP Sensor
→ Go To 7
No
7 Start the engine.
While monitoring engine vacuum on the DRB display, quickly open and close throttle
several times.
Did the Vacuum drop below 1.0 ?
Yes → Test Complete.
→ Go To 8
No
8 Turn the ignition off.
Remove the MAP Sensor and inspect condition of vacuum port.
Inspect condition of Intake Manifold or Throttle Body Vacuum Port.
Is there a restriction or defect in the vacuum ports?
Yes → Repair the restricted vacuum ports.
→ Go To 9
No
ACTION
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Replace the MAP Sensor.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
and the PCM.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
Perform POWERTRAIN VERIFICATION TEST VER - 5.
DRIVEABILITY - GAS
159
Continued
APPLICABILITY
All
All
All
All
All
All