Table 12
Troubleshooting Test Steps Values Results
1. Diagnostic Codes
Note: Certain diagnostic codes and/or event codes may cause
poor performance. Refer to in the electronic service tool.
A. Use the electronic service tool to check for active or logged
codes.
B. Use the electronic service tool to check the histogram infor-
mation if the engine has been derated.
Note: If the histograms contain engine derates and no diag-
nostic codes are present, then the engine is operating
normally.
Engine Derate or
Diagnostic Codes
Result: A diagnostic code is present.
Repair: Troubleshoot the code and then reset the
histogram.
Result: A diagnostic code is not present.
Proceed to Test Step 2.
2. Parameters in the Electronic Control Module (ECM)
A. Use the electronic service tool to verify that the correct pa-
rameters are being used. Refer to Troubleshooting, “Configu-
ration Parameters” for additional information.
Parameters Result: The parameters are not correct.
Repair: Input the correct parameters. Refer to Trouble-
shooting, “Configuration Parameters” for additional
information.
Result: The parameters are correct.
Proceed to Test Step 3.
3. Throttle Signal
A. Monitor the status for “Throttle Position” on the electronic
service tool. Verify that the status for “Throttle Position” is sta-
ble and that the engine is able to reach high idle speed.
Throttle signal Result: The throttle signal is stable.
Proceed to Test Step 4.
Result: The throttle signal is not stable.
Repair: Make the necessary repairs, Refer to the appropri-
ate circuit test for the type of speed control that is installed.
4. Air Intake and Exhaust System
A. Observe the check engine lamp. Check for an air filter re-
striction indicator, if equipped. Replace a plugged air filters.
Refer to the Operation and Maintenance Manual.
B. Check the air inlet and exhaust system for restrictions and/
or leaks.
Restrictions Result: There are restrictions in the air inlet or exhaust
system.
Repair: Make the necessary repairs, Refer to Systems Op-
eration/Testing and Adjusting, “Air Inlet and Exhaust Sys-
tem - Inspect” for additional information.
Result: There are no restrictions in the air inlet or exhaust
system.
For engines with a single turbocharger, proceed to Test
Step 5.
For engines with two turbochargers, proceed to Test Step
6.
(continued)
66 UENR4469-36
Symptom Troubleshooting
Copyright of Perkins Engine Company Limited. NOT FOR REPRINTING OR RESALE
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