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DTC P1128: MAP Sensor Signal Lower Than Expected

Turn the ignition switch ON (II).
Check the MAP with the scan tool.
Is 54.1 kPa (406 mmHg, 16.0 in.Hg), 1.6 V, or higher indicated?
1. YES - Intermittent failure, system is OK at this time.
2. NO - Replace the MAP sensor.