Intake Manifold Air Pressure Is Low - Perkins 854F-E34T Troubleshooting Manual

UENR0612
Table 47
Troubleshooting Test Steps
1. Air Inlet and Exhaust Restrictions
A. Check the air filter for damage.
B. Check the air inlet and exhaust system for restrictions and/
or leaks. Refer to Systems Operation, Testing, and Adjusting,
"Air Inlet and Exhaust System - Inspect".
2. Turbocharger Wastegate
A. Check the operation of the turbocharger wastegate.
B. Check the operation of the wastegate actuator. Refer to
Systems Operation, Testing, and Adjusting, "Turbocharger -
Inspect".
3. Wastegate Regulator
A. Use the electronic service tool to check for diagnostic trou-
ble codes that relate to the wastegate regulator.
Intake Manifold Air Pressure Is
Low
This procedure covers the following diagnostic code:
Table 48
J1939 Code
1127-18 Engine Turbocharger 1 Boost Pressure : Low
- moderate severity (2)
This document has been printed from SPI2. NOT FOR RESALE
Air inlet and ex-
haust system
Turbocharger
wastegate
Wastegate
regulator
i05955265
Diagnostic Trouble Codes for Low Intake Manifold Air Pressure
Description
The Electronic Control Module (ECM) detects the following conditions:
The actual intake manifold air pressure is less than the desired intake manifold
air pressure for at least 10 seconds. The difference between the two values is
dependent on engine operating conditions.
The engine speed is between 1000 rpm and 4000 rpm.
The engine coolant temperature is greater than 45° C (113° F).
There are no active 102 diagnostic codes for the intake manifold air pressure
sensor.
An active regeneration is not in progress.
There are no other active engine derates.
If equipped, the warning lamp will flash. The engine will be derated.
The fault will be cleared when the intake manifold air pressure is within the ac-
ceptable range for at least 11 minutes.
Values
Result: Defects found in the air inlet or exhaust systems.
Repair any defects. Replace damaged components.
Result: The air inlet and exhaust systems are OK.
Proceed to Test Step 2.
Result: There is a suspected fault in the wastegate or the
wastegate actuator.
Replace the turbocharger. Refer to Disassembly and Assem-
bly, "Turbocharger - Remove" and Disassembly and Assembly,
"Turbocharger - Install".
Result: The wastegate and the wastegate actuator operate
correctly.
Proceed to Test Step 3.
Result: Diagnostic codes are present that relate to the waste-
gate regulator.
Rectify the cause of any related codes. Refer to Troubleshoot-
ing, "Diagnostic Trouble Codes".
Result: There are no diagnostic codes that relate to the waste-
gate regulator.
Contact the Dealer Solution Network (DSN).
Symptom Troubleshooting
Results
Notes
101