Make: Cummins
Engine: ISM CM876 (2007-09)
Fauld Code: 2961
PID: 412
SPN: 412
FMI: 0
Description: EGR Temperature – Data Valid But Above Normal Operating Range – Least Severe
Level. EGR temperature has exceeded the engine protection limit.
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,
recalibrate the ECM.
Possible causes:
1)Malfunctioning EGR differential pressure tubes
2)A damaged EGR valve
3)A stuck open turbocharger control valve
4)A low reading from the EGR differential pressure sensor
5)A low reading for the EGR valve position sensor
6)High exhaust temperatures
7)Low coolant level
8)High coolant temperature
9)An incorrect coolant/water mixture
10)A stuck closed variable geometry turbocharger
11)A fouled EGR cooler.
NOTE: This fault code will most likely not be active with no load in the shop. The engine must
be loaded to trigger this fault code.
Possible repairs:
1)Replace the exhaust gas recirculation temperature sensor.
2)Drain the coolant and fill the cooling system with the proper mixture.
3)Tighten or replace the exhaust gas recirculation differential pressure sensor tubes.
Make: Cummins
Engine: ISM CM876 (2007-09)
Fauld Code: 2962
PID: 412
SPN: 412
FMI: 0
Description: Exhaust Gas Recirculation Temperature – Data Valid but Above Normal
Operational Range – Moderately Severe Level. EGR temperature has exceeded the engine
protection limit.
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, recalibrate the ECM.
Possible causes:
1)A fouled EGR cooler.
2)Failed EGR differential pressure tubes.
3)A failed EGR valve.
4)A stuck open turbocharger control valve.
5)A low reading from the EGR differential pressure sensor.
6)A low reading for the EGR valve position sensor.
7)High exhaust temperatures.
8)Low coolant level.
9)High coolant temperature.
10)An incorrect coolant/water mixture.
11)A stuck closed variable geometry turbocharger.
Note: This fault code will most likely not be active with no load in the shop. The engine must be
loaded to trigger this fault code.
Possible repairs:
1)Replace the EGR temperature sensor.
2)Drain the coolant and refill the cooling system with the proper mixture.
3)Tighten or replace the EGR differential pressure sensor tubes.
4)Clear the debris or replace the EGR differential pressure tube.
Make: Cummins
Engine: ISM CM875 (2003-06)
Fauld Code: 2964
PID: P105
SPN: 105
FMI: 0/16
Description: Intake Manifold 1 Temperature – Data Valid But Above Normal Operating Range –
Least Severe Level. Intake manifold air temperature signal indicates intake manifold air
temperature is above engine protection warning limit.
Troubleshooting:
The intake manifold air temperature sensor measures the temperature of the charge air (fresh
air compressed by the turbocharger, cooled by the charge air cooler, and mixed with EGR) as it
passes through the intake manifold. This fault code is activated if the intake manifold air
temperature is above 121°C [250° F] for five seconds.
NOTE: Prior to running the INSITE™ electronic service tool EGR Valve and EGR
Valve/Turbocharger Operational Test, the ECM Calibration Software Phase could possibly
need to be updated to the latest Software Phase. The ECM Calibration Phase Software can be
checked in INSITE™ electronic service tool, under ‘Features and Parameters’. Expand the
selection for ‘System ID and Dataplate and go to ‘Calibration Information’. If the Software
Phase is earlier than shown below, calibrate the ECM using the January 2006 INCAL™ CDROM,
or later. Engines with the Software Phase listed below or later do not require a
calibration.
ISX engines with CM870 (engines built after January 2004) require Software Phase 06050302.
ISX engines with CM870 (engines built before January 2004) require no changes at this time.
This is a warrantable calibration change.
Possible causes:
1)Plugged charge air cooler fins
2)Restricted airflow through the charge air cooler
3)Damaged EGR differential pressure sensor, or leaks in sensor tubes
4)Undersized charge air cooler
5)High turbocharger compressor outlet temperature
6)Fouled EGR cooler
7)Stuck EGR valve
8)Sensor malfunction.
Possible repairs:
1)Replace the intake manifold temperature sensor.