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10. Troubleshooting
General Troubleshooting Information
Troubleshooting engine problems can be difficult.
The engine control unit (ECM) can detect problems internally and in the electronic control system. This includes
determining if any of the sensor input voltages are too high or too low, if the camshaft and crankshaft position
sensor inputs are valid, and if the unit injector solenoids are responding properly.
If the ECM detects a problem with the electronic control system a diagnostic trouble code (DTC) specific to the
failed system will be stored in the ECM’s memory.
Diagnostic Trouble Codes (DTC’s)
There are two types of DTC’s
• Active
• Inactive (stored)
Active DTCs indicate that the failure is occurring. These types of failures are sometimes called “hard” failures.
They can be accessed on the diagnostic gauge (A) on the instrument panel.
Inactive DTCs indicate that a failure has occurred in the past but is not currently occurring. This type of “stored”
DTC can be caused by an “intermittent” failure. These could be problems such as a bad connection or a wire
intermittently shorting out.
If a sensor or wiring fails and a DTC is active for the sensor, the ECM will use a substitute “limp home” value in its
calculation to continue engine operation.
Displaying of Diagnostic Trouble Codes (DTCs)
SPN/FMI CODES
Stored and active diagnostic trouble codes are output on the PowerView Gauge according to the J1939
standard as a two-part code as shown on the table on the following pages.
The first part is a Suspect Parameter Number (SPN) followed by a Failure Mode Identifier (FMI) code. To
determine the exact failure, both (SPN and FMI) of the code are needed.
The SPN identifies the system or the component that has the failure; for example, SPN 000110 indicates a
failure in the engine coolant temperature circuit.
The FMI identifies the type of failure that has occurred; for example, FMI03 indicates value above normal.
Combining the SPN 000110 with FMI 03 yields engine coolant temperature input voltage too high.
Always contact your Clarke service dealer for help in correcting diagnostic trouble codes which are displayed
for your engine.
Inactive
Listing of Diagnostic Trouble Codes (DTCs)
The Diagnostic Trouble Codes (DTCs) are output on the diagnostic gauge according to J1939 standard as a two-
part code. The first part is a two to four-digit Suspect Parameter Number (SPN) followed by a one or two-digit
Failure Mode Identifier (FMI) code. Following is a list of SPN’s, FMI’s and a description of the diagnostic trouble
codes that can occur in the various engine systems. Not all the codes will be present in all engine applications.
When trouble codes appear on the PowerView diagnostic gauge, see your engine dealer for repairs as soon as
possible.
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