Make: Cummins
Engine: ISX12 CM2250 (2010-12)
Fauld Code: 352
PID: SID 212
SPN: 3509
FMI: 4
Description: Sensor Supply 1 Circuit- Voltage Below Normal or Shorted to Low Source
Troubleshooting:
Circuit Description
The sensor supply 1 of the electronic control module (ECM) provides a 5 volt supply for the
Exhaust Gas Recirculation (EGR) differential pressure sensor, exhaust gas pressure sensor,
EGR valve position sensor, and EGR orifice pressure sensor (if equipped).
Component Location
Sensor supply 1 is located in the ECM and provides a 5 volt supply to various engine sensors.
The supply voltage is spliced off in the engine harness to each sensor it supports.
Conditions for Running the Diagnostics
This diagnostic runs continuously when the keyswitch is in the ON position or when the engine
is operating.
Conditions for Setting the Fault Codes
The ECM detects that the sensor supply 1 signal voltage is less than 4.75-VDC for more than
one second.
Action Taken When the Fault Code is Active
The ECM illuminates the amber CHECK ENGINE light and/or the Malfunction Indicator Lamp
(MIL) immediately when the diagnostic runs and fails.
A default value is used for all of the sensors on the sensor supply 1 circuit.
Conditions for Clearing the Fault Code
To validate the repair, 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 after the diagnostic runs and passes.
For On Board Diagnostic (OBD) engines, the ECM will turn off the 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
Low voltage on the +5 volt supply wire can be caused by a short circuit to ground in a supply
wire, a short circuit between a supply wire and a return wire, a malfunctioning sensor, or a
malfunctioning ECM power supply.
Possible Cause:
1) EGR differential pressure sensor failure
2) Exhaust gas pressure sensor failure
3) EGR valve position sensor failure
4) EGR orifice pressure sensor failure
5) Aftertreatment fuel pressure sensor failure
6) Engine harness
7) ECM calibration
Make: Cummins
Engine: ISX12 CM2250 (2010-12)
Fauld Code: 428
PID: 97
SPN: 97
FMI: 3
Description: Water-In-Fuel Indicator Sensor Circuit- Voltage Above Normal or Shorted to High
Source
Troubleshooting:
Circuit Description
The water-in-fuel sensor is attached to the fuel filter. The electronic control module (ECM)
provides a 5 volt reference signal to the water-in-fuel sensor. When the water collected in the
fuel filter covers the sensor probes, the water-in-fuel sensor then pulls the 5-VDC reference
voltage to ground, indicating high water accumulation in the fuel filter.
Component Location
The water-in-fuel sensor is integrated into the bottom of the OEM supplied suction fuel filter.
The OEM supplied fuel filter is located on the intake side of the engine.
Conditions for Running the Diagnostics
This diagnostic runs continuously when the keyswitch is in the ON position.
Conditions for Setting the Fault Codes
The ECM detects that the water-in-fuel sensor signal voltage is above 4.95-VDC for 1 second.
Action Taken When the Fault Code is Active
The ECM illuminates the amber CHECK ENGINE lamp immediately when the diagnostic runs
and fails.
Conditions for Clearing the Fault Code
To validate the repair, 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 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 for this fault code include:
Open RETURN or SIGNAL circuit in the harness, connectors, or sensor
SIGNAL wire shorted to sensor supply or battery voltage.
Reference the appropriate OEM wiring diagram when troubleshooting circuits that utilize wiring
supplied by the OEM.
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.
Possible Cause:
1) Engine Harness
2) ECM calibration
Make: Cummins
Engine: X15 CM2450 X124B (2018 & Newer)
Fauld Code: 429
PID: N/A
SPN: 97
FMI: 4
Description: Water-In-Fuel Indicator Sensor Circuit- Voltage Below Normal or Shorted to Low
Source
Troubleshooting:
Circuit Description
The water-in-fuel sensor is attached to the fuel filter. The engine control module (ECM)
provides a 5 volt reference signal to the water-in-fuel sensor. When the water collected in the
fuel filter covers the sensor probes, the water-in-fuel sensor pulls the 5-VDC reference voltage
to ground, indicating high water accumulation in the fuel filter.
Component Location
The water-in-fuel sensor is integrated into the bottom of the OEM supplied suction fuel filter.
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 water in fuel sensor signal voltage was less
than 0.05-VDC for 1 second.
Action Taken When the Fault Code is Active
The ECM illuminates the amber CHECK ENGINE lamp immediately when the diagnostic runs
and fails.
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.
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
Possible causes of this fault code include:
Signal circuit shorted to ground in the harness, sensor, or connector.
Reference the appropriate OEM wiring diagram when troubleshooting circuits that utilize wiring
supplied by the OEM.
Possible Cause:
1) ECM failure
2) Engine harness
Make: Cummins
Engine: ISX CM871 (2007-09)
Fauld Code: 1893
PID: SID 324
SPN: 3251
FMI: 2
Description: EGR Valve Control Circuit – Abnormal Update Rate. No communications or invalid
data transfer rate detected on the SAE J1939 data link between the ECM and the smart EGR
valve.
Troubleshooting:
Verify the electronic control module (ECM) calibration is correct. Check the calibration revision
history found on QuickServe® Online for applicable fixes to the calibration stored in the ECM. If
necessary, calibrate the ECM. For ISX and ISM engines, see the following procedure in the
corresponding Troubleshooting and Repair Manual for the engine being serviced.
This fault code is logged when the primary engine ECM did not receive valid SAE J1939
information from the EGR valve.
Possible causes of this fault code include:
1)The EGR valve is not receiving power from the ECM. This could be caused by an open
circuit in the power supply wire or low voltage supplied by the primary engine ECM.
2)Open return circuit on the EGR valve circuit between the engine ECM and the EGR valve.
3)Open or short circuit on the SAE J1939 data link circuit between the ECM and the EGR
valve.
4)Intermittent communications between the EGR valve and the primary engine ECM on the
SAE J1939 data link.
5)Malfunctioning termination resistors in the engine data link harness.
6)A malfunctioning engine ECM.
7)A malfunctioning EGR valve.
Possible repairs:
1)Clean the connector and pins.
2)Tighten the ground connection.
3)Replace the engine harness.
4)Replace the ECM.
5)Replace the SAE J1939 termination resistor.
6)Repair or replace the engine harness.
7)Replace the EGR valve.
Make: Cummins
Engine: ISX CM871 (2007-09)
Fauld Code: 1896
PID: SID 146
SPN: 2791
FMI: 13
Description: EGR Valve Controller – Out of Calibration. The EGR valve has failed the automatic
calibration procedure at initial key ON.
Troubleshooting:
Verify the ECM calibration is correct. Check the calibration revision history found on
QuickServe™ Online for applicable fixes to the calibration stored in the ECM. If necessary,
calibrate the ECM.
When the keyswitch is initially turned ON, and at various times during engine operation, the
closed position of the EGR valve is checked. This diagnostic checks to make sure the EGR
valve is not stuck open.
This fault code is logged when the following error conditions exist:
1)The EGR valve motor measures the position of the EGR valve at initial key ON. If the valve is
detected to be out of the normal position, this fault code will be logged.
2)The EGR valve will close when the fault code is active.
3)The fault code will remain active until the next key cycle.
The ECM calibration contains an automatic EGR valve override test 30 seconds after turning
the keyswitch ON. The EGR valve will be commanded open to 60 percent and will be held in
this position for 1 minute and then it will be commanded to 0 percent open. Turn the keyswitch
OFF for 20 seconds and then turn the keyswitch ON and read the fault codes. If Fault Code
1896 is active, this indicates the EGR valve is stuck in the open position.
The fault code will only become inactive if the initial key ON EGR position check passes.
Possible repairs:
1)Replace the EGR valve.