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Home >> Toyota >> 1995 >> Paseo Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Diagnostic Testing >> Code 31 - Manifold Absolute Pressure (Map) Sensor Circuit >> Diagnosis & Repair
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Diagnosis & Repair

  1. Access ECM behind center console. Ensure ignition is on. Using DVOM, backprobe ECM harness connector. Measure voltage between terminals VC/VCC and E2. See Figure (M/T Calif.) or 10 (A/T Calif.) or Figure (A/T Except Calif.) or 13 (M/T Except ). If voltage is 4.5-5.5 volts, go to next step. If voltage is NOT 4.5-5.5 volts, replace ECM and retest.
  2. Measure voltage between ECM terminals PIM and E2. If voltage is 3.3-3.9 volts, go to next step. If voltage is NOT 3.3-3.9 volts, replace ECM and retest.
  3. Inspect circuits between MAP and ECM for open or short. Repair as needed. If circuits are okay, replace MAP sensor.
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