DTC P1297-A: NO CHANGE IN MAP SENSOR FROM START TO RUN Chrysler LHS II

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article.

Note. Vehicles equipped with a 2.7L engine are equipped with a Manifold Absolute Pressure (MAP) sensor. Vehicles equipped with a 3.2L or 3.5L engine are equipped with an Intake Air Temperature/Manifold Absolute Pressure (IAT/MAP) sensor. For this test, IAT/MAP will be identified as MAP sensor.

1. Turn ignition on with engine off. Using scan tool, read Diagnostic Trouble Codes (DTCs). If MAP SENSOR VOLTAGE TOO LOW DTC is set, go to «DTC P0107-A: MAP SENSOR VOLTAGE TOO LOW»(ref-576-S07791333252000030800000) . If MAP SENSOR VOLTAGE TOO LOW DTC is not set, go to next step.
2. Start engine. Allow engine to idle for 30 seconds. Using scan tool, read DTCs. If scan tool display GLOBAL GOOD TRIP is equal to zero, go to step 7 . If scan tool display GLOBAL GOOD TRIP is not equal to zero, go to next step.
3. Using scan tool, set engine speed to 1500 RPM. Using scan tool, read MAP sensor voltage. While monitoring scan tool display, wiggle MAP sensor wiring harness from MAP sensor to PCM. If engine stalls or voltage becomes erratic, repair wiring harness as necessary where wiggling caused problem to appear. Perform «TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES»(ref-576-S06971814902000030800000) . If engine did not stall or voltage did not become erratic, go to next step.
4. Using scan tool, return engine to idle. While observing scan tool display, snap throttle open and closed. If vacuum did not rapidly drop to less than one in. Hg, go to step 6 . If vacuum rapidly dropped to less than one in. Hg, go to next step.
5. Condition to set trouble code is not present at this time. NO CHANGE IN MAP FROM START TO RUN DTC sets if too small a difference is seen between barometric pressure at ignition on and manifold vacuum with engine running for 1.76 seconds. Possible causes are: restricted or leaking vacuum/pressure to MAP sensor, ice in MAP sensor or MAP sensor passage, failed MAP sensor, Powertrain Control Module (PCM) failure or faulty connections or wiring. Test is complete, perform «TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES»(ref-576-S06971814902000030800000) .
6. Inspect condition of intake manifold and MAP sensor vacuum ports. If a restriction or defect is found in vacuum ports, repair restricted or defective vacuum ports as necessary. Perform «TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES»(ref-576-S06971814902000030800000) . If no restrictions or defects are found in vacuum ports, replace MAP sensor. Perform «TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES»(ref-576-S06971814902000030800000) .
7. Turn ignition on with engine off. Remove MAP sensor and inspect for vacuum restrictions. If a restriction is not found, go to next step. If a restriction is found, remove restriction and install MAP sensor. Perform «TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES»(ref-576-S06971814902000030800000) .
8. Using a voltmeter, check voltage of MAP sensor 5-volt supply circuit at MAP sensor connector. See «MAP SENSOR CONNECTOR WIRE IDENTIFICATION»(ref-576-S05601286892000030800000) table. If voltage is more than 4 volts, replace MAP sensor. Perform «TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES»(ref-576-S06971814902000030800000) . If voltage is 4 volts or less, repair open 5-volt supply circuit. Perform «TEST VER-5A: ROAD TEST FOR OBD-II TROUBLE CODES»(ref-576-S06971814902000030800000) .

MAP SENSOR CONNECTOR WIRE IDENTIFICATION