Troubleshooting

Table 45
Troubleshooting Test Steps
Values Results
1. Check the Air Filter Element
A. Check the air intake system for plugged air filters or for dam-
aged air filters. If the engine is equipped with an air intake pre-
cleaner, verify the proper operation of the air intake precleaner.
Plugged Air Filter Result: The air filter is clogged.
Repair: Clean or replace the air filter. Verify that the
problem is resolved.
Result: The air filter is not clogged.
Proceed to Test Step 2.
2. Check the Air Inlet Piping
A. Check the air inlet piping for damage or restrictions.
Damaged Air Inlet
Piping
Result: The air inlet piping is damaged or has
restrictions.
Repair: Repair the piping or replace the piping. Veri-
fy that the problem is resolved.
Result: The air inlet piping does not have damage
or restrictions.
Proceed to Test Step 3.
3. Check the Enclosure Ventilation
A. Check that the engine has been installed in an enclosure that is
sufficiently ventilated.
Enclosure Ventilation Result: The engine does not have sufficient
ventilation.
Repair: Repair the ventilation for the enclosure. Ver-
ify that the problem is resolved.
i06225877
Intake Manifold Air Pressure Is
High
This procedure covers the following diagnostic code:
Table 46
Diagnostic Trouble Codes for High Intake Manifold Air Pressure
J1939 Code
Description
Notes
1127-16 Engine Turbocharger 1 Boost Pressure : High - moderate
severity (2)
The Electronic Control Module (ECM) detects that the ac-
tual intake manifold air pressure is greater than the de-
sired intake manifold air pressure by 50 kPa (7.25 psi) for
at least 10 seconds.
If equipped, the warning lamp will flash. The engine will be
derated.
If the actual intake manifold pressure is within 25 kPa
(3.6 psi) of the desired intake manifold air pressure for at
least 11 minutes, the code will reset.
Probable Causes
• Air inlet and exhaust restrictions
• Turbocharger wastegate
• Wastegate regulator
UENR0612-07 103
Symptom Troubleshooting
This document has been printed from SPI2. NOT FOR RESALE