Diagnostic Aids
When attempting to diagnose an intermittent problem, use scan tool to review malfunction history diagnostic information. The data can be used to duplicate a problem.
With ignition on, engine off, the MAP sensor reading should be the same as barometric pressure (no vacuum-high voltage). Comparing this reading with a known good sensor is a good way of verify accuracy of suspect sensor. Readings should be within .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 | ||
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