Detroit DD15 EPA07 (2007-09) Fault Code: SPN 2631 FMI 4 (MCM, ACM) Intake Manifold Pressure Sensor Circuit Failed Low
NOTE: Please see the step by step troubleshooting procedures for this specific code.
PROBABLE CAUSES:
1. Wiring between manifold pressure/temperature sensor and ECM connector.
2. Intake manifold pressure/temperature sensor.
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