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Home >> Mitsubishi >> 1995 >> Eclipse GSX, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 2.0L Turbo >> Diagnostic Tests >> Code P1400: MDP Sensor Circuit Fault
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Code P1400: MDP Sensor Circuit Fault

  1. Disconnect Manifold Differential Pressure (MDP) sensor connector. Install test harness MD991348 between MDP sensor and harness connector. With engine at idle, measure voltage between terminal No. 1 and ground. Reading should be .8-2.4 volts. When throttle is opened suddenly, voltage should momentarily rise above .8-2.4 volts. If voltage is as specified, go to next step. If voltage is not as specified, go to step  3 .
  2. With PCM connector connected, measure voltage between terminal No. 73 (Light Green/Black wire) and ground. Start engine. If voltage is .8-2.4 volts, check PCM connector. If PCM connector is okay, replace PCM. If voltage is not .8-2.4 volts, check wiring harness between PCM and MDP sensor connector.
  3. Disconnect MDP sensor connector. Turn ignition on. Measure voltage between sensor connector terminal No. 3 (Green/Yellow wire) and ground. Reading should be 4.8-5.2 volts. Check continuity between sensor connector terminal No. 2 (Black wire) and ground.
  4. If voltage is not within specification or continuity does not exist, check PCM connector and wiring harness between MDP sensor connector and PCM. If connector and wiring is okay, replace PCM.
  5. If voltage is within specification and continuity exists, check MDP sensor connector and wiring harness between PCM and MDP sensor connector. If connector and wiring is okay, replace MDP sensor.
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