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

NOTE: If a MAP High or Low DTC is set along with P1297, diagnose the High or Low DTC before continuing. See DTC P0107: MAP SENSOR VOLTAGE TOO LOW or DTC P0108: MAP SENSOR VOLTAGE TOO HIGH .

Turn the ignition on. With the DRBIII(R), read DTCs. Is the Good Trip counter displayed and equal to zero? If yes, go to next step, if no, go to step 14 .
With the DRBIII(R), read the MAP sensor voltage. Is the voltage less than 3.19 volts? If yes, go to next step If no, go to step 11 .
Turn the ignition off. Disconnect the MAP sensor harness connector. Turn the ignition on. Measure the voltage on the 5-volt supply circuit in the MAP sensor harness connector. Is the voltage 4.5-5.2 volts? If yes, go to next step. If no, go to step 8 .
With the DRBIII(R), monitor the MAP sensor voltage. Is the voltage more than 1.2 volts? If yes, replace the MAP sensor. If no, go to next step.
Turn the ignition off. Disconnect the PCM harness connectors. Measure the resistance between ground and the MAP sensor signal circuit in the MAP sensor harness connector. Is the resistance less than 100 ohms? If yes, repair the MAP sensor signal circuit for a short to ground. If no, go to next step.
Measure the resistance between the MAP sensor signal circuit and the sensor ground circuit in the MAP sensor harness connector. Is the resistance less than 100 ohms? If yes, repair the MAP sensor signal circuit for a short to the sensor ground circuit. If no, go to next step.
There are no possible causes remaining, replace PCM.
Turn the ignition off. Disconnect the PCM harness connectors. Measure the resistance between ground and the 5-volt supply circuit in the MAP sensor harness connector. Is the resistance less than 100 ohms? If yes, repair the 5-volt supply circuit for a short to ground. If no, go to next step.
Measure the resistance of the 5-volt supply circuit between the MAP sensor harness connector and the PCM harness connector. Is the resistance less than 5.0 ohms? If yes, go to next step. If no, repair the 5-volt supply circuit for an open.
There are no possible causes remaining, replace PCM.
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 less than 5.0 ohms? If yes, go to next step. If no, repair the 5-volt supply circuit for an open.
Remove the MAP sensor. Inspect the vacuum port, check for restrictions or any foreign materials. Were any problems found? If yes, repair as necessary. If no, go to next step.
There are no possible causes remaining, replace PCM.

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.

Conditions that set DTC are not present at this time. The following list may help in identifying the intermittent condition:
- With the engine running at normal operating temperature, monitor the DRBIII(R) 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(R) Freeze Frame information to identify under what conditions the DTC set.
- Refer to any Technical Service Bulletin (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.