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SPN 102 - FMI 2 (Fault Code 433)

SPN102 FMI2
Intake Manifold Pressure Sensor Circuit - Data erratic, intermittent or incorrect

Intake Manifold Pressure Sensor Circuit


CODES:
Fault Code: 433
PID(P), SID(S): P102
SPN: 102
FMI: 2/2
Lamp: Amber

REASON: The intake manifold pressure sensor is reading an erratic value.

EFFECT: Engine power derate.

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 pressure sensor is located in the air intake horn.

Conditions for Running the Diagnostics:
This diagnostic runs continuously when the keyswitch is in the ON position or when the engine is running.

Conditions for Setting the Fault Codes:
The Engine Control Module (ECM) detected the intake manifold pressure reading was reading higher or lower than expected.

Action Taken When the Fault Code is Active:
• The ECM illuminates the amber CHECK ENGINE lamp and/or the malfunction indicator lamp (MIL) immediately when the diagnostic runs and fails.
• A default value of the intake manifold pressure reading is used.

Conditions for Clearing the Fault Code:
• To validate the repair, perform a key cycle, start the engine and let it idle for 1 minute.
• The fault code status displayed by the recommended Cummins® electronic service tool or equivalent will change to INACTIVE immediately after the diagnostic runs and passes.
• The ECM will turn off the amber CHECK ENGINE lamp immediately after the diagnostic runs and passes.
• The “Reset All Faults” command in the recommended Cummins® electronic service tool or equivalent can be used to clear active and inactive faults.

Shop Talk:
This diagnostic consists of two parts. At key OFF, the sensor readings for intake manifold pressure, barometric air pressure, oil pressure (if available), and exhaust gas pressure are compared to each other. This fault code occurs if the intake manifold pressure sensor reading is different from the other sensor readings. This check is only done once after the keyswitch is turned OFF. This fault can also be set active when the intake manifold pressure is too high or low for the current engine operating conditions when the engine is running. The ECM compares the intake manifold pressure reading to turbocharger speed to determine if the pressure reading is valid.


Read More:
SPN 100 - FMI 2 (Fault Code 435)
SPN 157 - FMI 0 (Fault Code 449)









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