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Manifold Absolute Pressure (Map) Sensor

  1. Inspect MAP sensor vacuum hose connections at throttle body and sensor. Replace or repair vacuum hose if necessary.
  2. Turn ignition on with engine off. Using DVOM, check MAP sensor output voltage. Connect DVOM between MAP sensor terminal "B" (Dark Green/Red wire) and ground. Terminal identification letters/numbers are marked on sensor body.
  3. Output voltage should be 4-5 volts. Voltage should drop to 1.5-2.1 volts with a hot engine operating in Neutral and at idle speed. Also check for output voltage at PCM wiring harness terminal No. 1 (Dark Green/Red wire). If voltage is not as previously specified, repair wiring harness as necessary.
  4. Turn ignition on. Check MAP sensor supply voltage at Violet/White wire at sensor connector "C". Supply voltage should be 4.5-5.5 volts. Also check for supply voltage at PCM wiring harness terminal No. 6 (Violet/White wire). If supply voltage is not as specified, repair wiring harness if necessary.
  5. Check continuity of MAP sensor ground circuit (Black/Light Blue wire) between sensor connector terminal "A" and PCM wiring harness terminal No. 4 (Black/Light Blue wire). If continuity does not exist, repair wiring harness.
  6. Check continuity of MAP sensor ground circuit between PCM wiring harness terminals No. 4 (Black/Light Blue wire) and No. 11 (Black/Tan wire). If ohmmeter indicates an open circuit, go to next step. If ground connection is okay, replace PCM.
    NOTE: If terminal No. 4 has a short circuit to 12 volts, correct this condition before replacing PCM. If necessary, perform appropriate MAP sensor tests in TESTS W/CODES - 2.5L article in the ENGINE PERFORMANCE section.
  7. Check for defective sensor ground connection. Connection is located on right side of engine block, at oil dipstick tube mounting block. Repair connection as necessary.
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