(Table 125, contd)
Troubleshooting Test Steps
Values Results
3. Check the Air Inlet and Exhaust System
A. Check the air inlet system for leaks and for restrictions.
B. Check the exhaust system for leaks and for restrictions.
C. Test the exhaust back pressure regulator. Refer to Trouble-
shooting, “Motorized Valve - Test”.
Air inlet and ex-
haust system
Result: The air inlet system has a leak or is restricted.
Repair: Clear any restrictions in the air inlet system.
Repair any air leaks in the air inlet system.
Result: The exhaust system has a leak or is restricted.
Repair: Clear any restrictions in the exhaust system.
Repair any air leaks in the exhaust system.
If the fault is still present, proceed to Test Step 4.
4. Check the NRS Inlet Pressure Sensor and Sensor Pipes
Refer to Illustration 83 .
A. Check pipe (4) for the NRS inlet pressure sensor for leaks,
restrictions, or blockage.
B. Check pipe (3) for the NRS differential pressure sensor for
leaks or any restriction.
C. Test the exhaust back pressure regulator. Refer to Trouble-
shooting, “Motorized Valve - Test”.
Pressure sensor
and pipes
Result: There is a leak, a restriction, or a blockage in one
of the sensor pipes.
Repair: If a pipe has a leak or a restriction, replace the
pipe.
If a pipe is blocked with soot or condensates, remove the
pipe and clear the blockage with an air line that is set at a
maximum pressure of 200 kPa (29 psi). If the blockage is
cleared, install the pipe. If the blockage cannot be cleared,
replace the pipe.
Result: The NRS inlet pressure sensor is blocked.
Repair: Replace the NRS inlet pressure sensor.
Result: There are no leaks, restrictions, or blockages in the
sensor or the pipes.
Proceed to Test Step 5.
5. Check the NRS Temperature Sensor
Refer to Illustration 83 .
A. Remove temperature sensor (1) from NRS mixer (2). Refer
to Disassembly and Assembly, “Temperature Sensor (Cooled
Exhaust Gas) - Remove and Install”.
B. Check the sensor probe for excessive deposits.
C. Test the exhaust back pressure regulator. Refer to Trouble-
shooting, “Motorized Valve - Test”.
Temperature
sensor
Result: The probe on the temperature sensor has exces-
sive deposits.
Repair: Carefully remove the deposits from the sensor
probe. Make sure that the sensor probe is not damaged.
If the deposits cannot be easily removed, replace the tem-
perature sensor. Refer to Disassembly and Assembly,
“Temperature Sensor (Cooled Exhaust Gas) - Remove and
Install”.
Result: The probe on the temperature sensor does not
have excessive deposits.
Proceed to Test Step 6.
(continued)
UENR4469-36 233
Symptom Troubleshooting
Copyright of Perkins Engine Company Limited. NOT FOR REPRINTING OR RESALE
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