Chrysler Repair: Code P1297 High Sides Shorted Together, powertrain control module, 1999 chrysler concorde

Question
Hi Roland,
I have a 1999 Chrysler Concorde, 2.7L, check engine light came on.  Took it to Autozone and code P1297 High Sides shorted together came up. Just replaced the engine 6 weeks ago.  How do I fix this?
Thanks,


Answer
HI Tina,
According to my powertrain manuals for the 2.7L, the P1297 code has nothing to do with "high sides shorted together" whatever that means. Rather it means that there is no significant difference in the voltage from the manifold absolute pressure sensor whether the engine is running or not, where as there should be.
The possible causes are a restricted vacuum connection between the intake manifold and the MAP sensor, the sensor is failed, the connectors are not together, the wires are damaged, or the powertrain control module is faulty. the MAP is mounted on the intake manifold, and you can identify it because its electrical plug has 3 wires: Black/light blue, violet/white, and dark green/red. You can unscrew the bolts that fasten it to the manifold and check that there is nothing restricting the air pathway between the manifold and the sensor and also inspect the gasket that seals the interface. Also look at the plug to the sensor and examine the condition of the three wires for damage to their insulation. If that doesn't solve the problem then if you have a voltmeter I can tell you what it should read on those 3 wires. So re-check the meaning of the P1297 with autozone, but that is what Chrysler classifies that number as being. Have them read it again just to verify. The wires are a ground, a 5 volt supply, and the signal whose voltage should very from 1 to 4 compared to the ground wire as you rev the engine up and down (identified in the order of colors given above). I can give you the pin numbers at the powertrain controlled to verify whether the wires to the sensor are connected.
Roland