Diagnostics; Operation - Detroit Diesel DDEC VI Application And Installation

5.4

DIAGNOSTICS

Diagnostics is a standard feature of DDEC VI. The purpose of this feature is to provide
information for problem identification and problem solving in the form of a code. The MCM and
CPC continuously perform self diagnostic checks and monitors the other system components.
Information for problem identification and problem solving is enhanced by the detection of faults,
retention of fault codes and separation of active from inactive codes.
5.4.1

OPERATION

The engine-mounted MCM includes control logic to provide overall engine management. System
diagnostic checks are made at ignition on and continue throughout all engine operating modes.
Sensors provide information to the MCM and CPC regarding various engine and vehicle
performance characteristics. The information is used to regulate engine and vehicle performance,
provide diagnostic information, and activate the engine protection system.
The instrument panel lamps are listed in Table 5-8.
NOTE:
The MCM and CPC save error codes into memory after the ignition is turned off. The
codes will not be stored if there is an interruption of battery power or recycling of the
ignition.
The AWL is illuminated and a code is stored if an electronic system fault occurs. This indicates
the problem should be diagnosed as soon as possible. The CPC illuminates the AWL and RSL
and stores a malfunction code if a potentially engine damaging fault is detected. These codes can
be accessed in one of three ways:
□ Commercially available J1587/J1939 diagnostic tools
□ Detroit Diesel Diagnostic Link® (DDDL 7.0)
□ Flashing the AWL and RSL with the SEO/Diagnostic Request Switch
There are two types of diagnostic codes:
□ An active code - a fault present at the time when checking for codes
□ An inactive code - a fault which has previously occurred; inactive codes are logged into
the CPC and time stamped with the following information:
The dashboard panel lamps listed in Table 5-8 alert the driver of different conditions.
All information subject to change without notice. (Rev. 01/07)
7SA827 0701 Copyright © 2007 DETROIT DIESEL CORPORATION
DDEC VI ELECTRONIC CONTROLS APPLICATION AND INSTALLATION
5-15