Diagnostic Aids

DTC will set if either MAP or TP sensor is out of range. To distinguish which one failed, review malfunction history information on scan tool and attempt to duplicate conditions.

Check sensor and PCM connection for corrosion. Check for proper terminal connections. With ignition on, engine off, MAP reading should be the same as BARO reading because manifold pressure is equal to atmospheric pressure (no vacuum-high voltage). Comparing this reading to a known-good vehicle with the same sensor is a good way to check accuracy of suspect sensor. Reading should be within 0.4 volt. See MAP SENSOR VOLTAGE table.

MAP SENSOR VOLTAGE ⁽¹⁾

Altitude

Voltage Range

Less Than 1000

3.8-5.5

1000-2000

3.6-5.3

2000-3000

3.5-5.1

3000-4000

3.3-5.0

4000-5000

3.2-4.8

5000-6000

3.0-4.6

6000-7000

2.9-4.5

7000-8000

2.8-4.3

8000-9000

2.6-4.2

9000-10,000

2.5-4.0

⁽¹⁾	Check with ignition on, engine off.