Cummins X15 CM2350 X116B Performance Series (2018 & Newer) Fault Code: 7397 PID: SPN: 102 FMI: 0/0 Engine Intake Manifold Pressure – Data Valid But Above Normal Operating Range – Most Severe Level

Lamp:
Amber

Reason:
Intake manifold pressure is above the maximum operating limit.

Effect:
Possible reduced engine performance.

Circuit Description:
The Engine Control Module (ECM) provides a 5 volt supply to the intake manifold pressure sensor on the sensor supply circuit. The ECM also provides a ground on the sensor return circuit. The intake manifold pressure sensor provides a signal to the ECM on the intake manifold pressure sensor signal circuit. This sensor signal voltage changes based on the pressure in the intake manifold.

Component Location:
The intake manifold 1 pressure/temperature sensor is located in the air intake manifold.

Conditions for Running the Diagnostics:
1. This diagnostic runs continuously when the engine is running.
2. Ambient air temperature is below a calibrated value.

Conditions for Setting the Fault Code:
The Engine Control Module (ECM) detected the intake manifold pressure reading was higher than expected for the engine operating conditions.

Action Taken When the Fault Code is Active:
The ECM illuminates the amber check engine lamp and/or Malfunction Indicator Lamp (MIL) after the diagnostic fails on two consecutive trips.

Conditions for Clearing the Fault Code:
1. To validate the repair using a diagnostic road test, utilize a route that incorporates both stop and go city type driving and steady state highway type driving. It may be necessary to load the unit for certain diagnostics in the ECM to run.
2. To validate the repair using a chassis dynamometer, utilize a routine that incorporates acceleration and motoring events, steady state highway type operation, and load. This will simulate normal driving and allow the diagnostics in the ECM to run.
3. The fault code status displayed by the recommended diagnostic tool or equivalent will change to inactive immediately after the diagnostic runs and passes.
4. The ECM will turn off the amber check engine lamp immediately after the diagnostic runs and passes.
5. For On-Board Diagnostics (OBD) engines, the ECM will extinguish the Malfunction Indicator Lamp (MIL) after three consecutive trips where the diagnostic runs and passes.
6. The “reset all faults” command in the recommended diagnostic tool or equivalent can be used to clear active and inactive faults, as well as extinguish the MIL for OBD applications.

Shop Talk:
Possible causes of this fault code include:
1. A malfunctioning variable geometry turbocharger (VGT).
2. High exhaust restriction.
3. Malfunctioning intake manifold pressure/temperature sensor.