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DTC P1297: No Change In Map From Start To Run: Testing

    NOTE: If DTC P0107 or P108 is also set, diagnose DTCs before continuing with this test. See DTC P0107: MAP SENSOR VOLTS TOO LOW  or DTC P0108: MAP SENSOR VOLTS TOO HIGH  .
  1. Turn the ignition on. With the DRBIII®, read DTCs. Is the Good Trip counter displayed and equal to zero? If yes, go to next step. If no, go to step  14.
  2. Turn the ignition on. With the DRBIII®, read the MAP Sensor voltage. Is the voltage below 3.19 volts. If yes, go to next step. If no, go to step  11.
  3. Disconnect the MAP Sensor harness connector. Turn the ignition on. Measure the voltage of the 5-Volt Supply circuit in the MAP Sensor harness connector. Is the voltage between 4.5 to 5.2 volts? If yes, go to next step. If no, go to step  8.
  4. With the DRBIII®, monitor the MAP Sensor voltage. Turn the ignition on. Is the voltage above 1.2 volts? If yes, replace the MAP Sensor. If no, go to next step.
  5. Turn the ignition off. Disconnect the PCM harness connectors. Measure the resistance of the MAP Sensor Signal circuit in the MAP Sensor harness connector to ground. Is the resistance below 100 ohms? If yes, repair the MAP Sensor Signal circuit for a short to ground. If no, go to next step.
  6. Measure the resistance between the MAP Sensor Signal circuit and the Sensor ground circuit in the MAP Sensor harness connector. Is the resistance below 100 ohms? If yes, repair the MAP Sensor Signal circuit for a short to the Sensor ground circuit. If no, go to next step.
  7. There are no possible causes remaining, replace PCM. Program the new PCM. See PROGRAMMING .
  8. Turn the ignition off. Disconnect the MAP Sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance of the 5-Volt Supply circuit in the MAP Sensor harness connector to ground. Is the resistance below 100 ohms? If yes, repair the 5-Volt Supply circuit for a short to ground. If no, go to next step.
  9. Measure the resistance of the 5-Volt Supply circuit between the MAP Sensor harness connector and the PCM C2 harness connector. Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the 5-Volt Supply circuit for an open.
  10. There are no possible causes remaining, replace PCM. Program the new PCM. See PROGRAMMING .
  11. Turn the ignition off. Disconnect the MAP Sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance of the 5-Volt Supply circuit between the MAP Sensor harness connector and the PCM harness connector. Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the 5-Volt Supply circuit for an open.
  12. Turn the ignition off. Remove the MAP Sensor. Inspect the vacuum port, check for restrictions or any foreign materials. Were any restrictions found? If yes, repair as necessary. If no, go to next step.
  13. There are no possible causes remaining, replace the MAP Sensor.
  14. The conditions that set the DTC are not present at this time. The following may help in identifying the intermittent condition. With the engine running at normal operating temperature, monitor the DRBIII® parameters related to the DTC while wiggling the wiring harness. Look for parameter values to change and/or a DTC to set. Review the DRBIII® Freeze Frame information. If possible, try to duplicate the conditions under which the DTC was set. Refer to any Technical Service Bulletins (TSB) that may apply. Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals. Were any of the above conditions present? If yes, repair as necessary. If no, test is complete.
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