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Home › Mitsubishi › 1996 › Eclipse Base, Standard › Repair and Diagnosis › Engine Performance › System › Engine Controls - Tests W/Codes - 2.0L Turbo › Circuit Tests › DTC P1400 - MDP Sensor Circuit Malfunction

DTC P1400 - MDP Sensor Circuit Malfunction

  1. Disconnect MDP sensor connector. Install Test Harness (MD991348 ) between MDP sensor and harness connector. With engine at idle, check voltage between ground and test harness terminal No. 1 (Red Clip). Reading should be 0.8-2.4 volts. When throttle is opened suddenly, voltage should momentarily rise above 0.8-2.4 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, check voltage between ground and terminal PCM connector No. 73 (Light Green/Black wire). Start engine. If voltage is 0.8-2.4 volts, check PCM connector. If PCM connector is okay, replace PCM. If voltage is not 0.8-2.4 volts, check wiring harness between PCM and MDP sensor connector.
  3. Disconnect MDP sensor connector. Turn ignition on. Check voltage between ground and MDP sensor connector terminal No. 3 (Green/Yellow wire). Reading should be 4.8-5.2 volts. Check continuity between ground and MDP sensor connector terminal No. 2 (Black wire).
  4. If voltage is not as specified or continuity does not exist, check PCM connector and wiring harness between MDP sensor connector and PCM. If connector and wiring are okay, replace PCM.
  5. If voltage is as specified and continuity exists, check MDP sensor connector and wiring harness between PCM and MDP sensor connector. If connector and wiring are okay, replace MDP sensor.
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