Make: Cummins
Engine: X15 CM2450 X124B (2018 & Newer)
FAULD CODE: 125
PID: PID 102
SPN: 102
FMI: 18
Description: Intake Manifold 1 Pressure- Data valid But Below Normal Operating Range-
Moderately Severe Level
Troubleshooting:
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 horn.
Conditions for Running the Diagnostics
This diagnostic runs continuously when the engine is running.
Conditions for Setting the Fault Codes
The Engine Control Module (ECM) detected the intake manifold pressure reading was below
the expected level for the engine operating conditions.
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.
Exhaust Gas Recirculation (EGR) valve operation will be disabled.
Engine torque will be reduced if the engine is operated for an extended period of time with this
fault active.
Conditions for Clearing the Fault Code
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.
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.
The fault code status displayed by INSITE™ electronic service tool 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 INSITE™ electronic service tool can be used to clear active
and inactive faults, as well as extinguish the MIL for OBD applications.
Shop Talk
The intake manifold 1 pressure sensor monitors pressure in the intake manifold. This fault is
set active when the intake manifold pressure is too low for the present engine operating
conditions. The ECM commands a charge flow command and the VGT and EGR valve move to
meet this command. If the engine is unable to achieve the desired oxygen level necessary for
complete combustion, this fault code is logged.
Possible causes of this fault are:
Leaks in the air intake system between the turbocharger and intake manifold
A damaged intake manifold pressure sensor
A damaged barometric pressure sensor
Restriction in the charge-air cooler
Leaks or restrictions in the EGR system plumbing
Fuel inlet restriction too high (normally caused by a restricted fuel filter).
Possible Cause:
1) Charge-air cooler failure
2) Intake manifold temperature/pressure sensor failure
3) ECM calibration
Make: Cummins
Engine: ISX12 CM2250 (2010-12)
Fauld Code: 143
PID: 100
SPN: 100
FMI: 18
Description: Engine Oil Rifle Pressure- Data Valid But Below Normal Operating Range-
Moderately Severe Level
Troubleshooting:
Circuit Description
The engine control module (ECM) provides a 5 volt supply to the engine oil pressure sensor on
the sensor supply circuit. The ECM also provides a ground on the sensor return circuit. The
engine oil pressure sensor provides a signal to the ECM on the engine oil pressure sensor
signal circuit. This sensor signal voltage changes, based on the pressure in the oil rifle. The
ECM will detect a low signal voltage at operating conditions when the oil pressure may be
slightly lower. The ECM will detect a high signal voltage during high engine speeds or
operating conditions when the oil temperature is low.
If the ECM detects low signal voltage, indicating low engine oil pressure, this fault code sets.
Component Location
The engine oil pressure sensor is located on the left side of the engine block.
Conditions for Running the Diagnostics
This diagnostic runs continuously when the keyswitch is in the ON position and the engine is
operating.
Conditions for Setting the Fault Codes
The ECM detects that the engine oil pressure is less than the engine protection limits for more
than 5 seconds.
Action Taken When the Fault Code is Active
The ECM illuminates the amber CHECK ENGINE light immediately when the diagnostic runs
and fails.
A torque derate issued by the ECM limits the power output of the engine.
Conditions for Clearing the Fault Code
To validate the repair using a Diagnostic Road Test, utilize a route that incorporates both stopand-
go city driving and steady state highwaye driving. It may be necessary to load the unit for
certain diagnostics in the ECM to run.
To validate the repair using a Chassis Dynamometer Test, utilize a routine that incorporates
acceleration and motoring events, steady state highway operation, and load. This will simulate
normal driving and allow the diagnostics in the ECM to run.
The fault code status displayed by INSITE™ electronic service tool will change to INACTIVE
and the torque derate will be removed immediately after the oil pressure reading is detected to
be within the normal operating range and the diagnostic runs and passes.
The ECM will turn off the amber CHECK ENGINE lamp after the diagnostic runs and passes.
The “Reset All Faults” command in INSITE™ electronic service tool can be used to clear active
and inactive faults.
Shop Talk
Possible causes of this fault code include:
Low oil pressure
Incorrect oil level
Degraded, diluted, or incorrect engine oil.
Possible Cause:
1) ECM calibration
Make: Cummins
Engine: ISX CM870 (2003-06)
Fauld Code: 197
PID: 111
SPN: 111
FMI: 1
Description: Coolant Level – Data Valid But Below Normal Operating Range – Moderately
Severe Level. Low engine coolant level detected.
Troubleshooting:
This fault code goes active when the coolant level inside the radiator top tank or surge tank
drops below the sensor level. Fill the top tank with coolant.
If this fault code is active and the coolant level is not low, disconnect the coolant level sensor
and check the connectors for traces of coolant. If coolant is found at the electrical connectors,
the sensor has malfunctioned and must be replaced.
For intermittent power supply and datalink communication issues with Aftertreatment
Components, it is highly recommended that the OEM Power Distribution Center fuses and
relays be thoroughly checked for loose, missing or intermittent connections.
Note: It may not be possible to perform an aftertreatment diesel particulate filter (DPF)
regeneration while this fault code is active.
Possible repairs:
1)Add coolant to the engine.
2)If necessary, calibrate the ECM.
Make: Cummins
Engine: X15 CM2450 X124B (2018 & Newer)
Fauld Code: 351
PID: PID 110
SPN: 627
FMI: 12
Description: Injector Power Supply- Bad Intelligent Device or Component
Troubleshooting:
Circuit Description
Between each injection event, the Engine Control Module (ECM) attempts to recharge the
injector power supply. The injector power supply consists of a bank of capacitors; if this power
supply is maintained at high voltage. Recharging is accomplished by recovering energy stored
in the injector solenoids. For the injector power supply to remain fully charged, there must be
good ECM battery power and ground, a good engine speed sensor, and good injector circuits.
Component Location
The engine harness connects the ECM to the pass-through connector(s) that are located in the
rocker housing. Internal injector harnesses are located under the valve cover and connect the
injectors to the engine harness at the pass-through connector(s).
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 measured injector power supply voltage was
less than the commanded injector power supply voltage.
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.
Exhaust Gas Recirculation (EGR) valve operation will be disabled.
Engine torque will be reduced if the engine is operated for an extended period of time with this
fault active.
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 INSITE™ electronic service tool 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.
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.
The Reset All Faults command in INSITE™ electronic service tool can be used to clear active
and inactive faults, as well as extinguish the MIL for OBD applications.
Shop Talk
This fault code will become active after key ON if the battery charge is above a minimum
threshold, and, at the same time, the measured injector power supply voltage is lower than the
commanded injector power supply voltage.
Possible Cause:
1) ECM failure
2) ECM power supply harness, Fuses, fuses holders
3) Battery Terminals
4) Battery Failure