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DTC P1296: No 5 Volts To Map Sensor: Testing

NOTE: If DTC P0107 is also present with DTC P1296, repair DTC P0107 before continuing with this test. See DTC P0107: MAP SENSOR VOLTAGE TOO LOW .
  1. Turn ignition on, engine not running. With the DRBIII® in Sensors, read the MAP sensor voltage. Is the voltage below 2.35 volts? If yes, go to next step. If no, go to step  8.
  2. Turn the ignition off. Disconnect the MAP Sensor harness connector. Turn ignition on, engine not running. Measure the voltage of the 5-Volt Supply circuit at the MAP Sensor harness connector. Is the voltage above 4.5 volts? If yes, go to next step. If no, go to step  5.
  3. Turn ignition on, engine not running. With the DRBIII® in Sensors, read the MAP Sensor voltage. Is the voltage above 4.5 volts? If yes, replace the MAP Sensor. If no, go to next step.
  4. There are no possible causes remaining, replace PCM. Program the new PCM. See PROGRAMMING .
  5. Turn the ignition off. Disconnect the MAP Sensor harness connector. Disconnect PCM connectors. Measure the resistance of the 5-Volt Supply circuit from the MAP Sensor harness connector to the PCM harness connector. Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the open or high resistance in the 5-Volt Supply circuit.
  6. Measure the MAP Sensor 5-Volt Supply circuit for resistance 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.
  7. There are no possible causes remaining, replace PCM. Program the new PCM. See PROGRAMMING .
    8. WARNING: When the engine is operating, do not stand in a direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing.
  8. 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 wire harness. Look for any chafed, pierced, pinched, or partially broken wires. Visually inspect the related wire 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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