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DTC P1296: No 5 Volts To Map Sensor: Testing

  1. Start engine and allow it to idle. Using scan tool, read Manifold Absolute Pressure (MAP) sensor voltage. If voltage is less than 4.5 volts, turn engine off and go to step  4 . If voltage is 4.5 volts or more, turn engine off and go to next step.
  2. Turn ignition off. Visually inspect related connectors and wiring harness. Repair connectors and wiring harness as necessary. See WIRING DIAGRAMS article. If connectors and wiring harness are okay, go to next step.
  3. Start engine and allow it to idle. Wiggle connectors and wiring harness from MAP sensor to PCM while monitoring MAP sensor voltage. See Figure or Figure . If voltage changes while wiggling connectors and wiring harness, repair connectors and wiring harness where wiggling caused voltage to change. If voltage does not change, no problem is indicated at this time. Test is complete.
  4. Turn ignition off. Disconnect MAP sensor connector. See Figure or Figure . Disconnect Powertrain Control Module (PCM) connectors. PCM is located on firewall in right rear corner of engine compartment. Inspect connectors for damaged pins, corrosion and loose terminals. Repair connectors as necessary. If connectors are okay, measure resistance of Orange wire between MAP sensor and terminal No. 17 at PCM C1 connector. If resistance is less than 5 ohms, go to next step. If resistance 5 ohms or more, repair open in Orange wire.
  5. Measure resistance between ground and Orange wire at MAP sensor connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground in Orange wire.
  6. At this time, PCM is assumed to be defective. Replace PCM.
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