Diagnosis And Testing; Ecm Reactions During Operation; Ecm Self-Diagnostics - Mercury MerCruiser D2.8L D-Tronic Service Manual

DESCRIPTION

Diagnosis and Testing

ECM Reactions During Operation

The ECM is capable of performing diagnostic checks within the electronic diesel fuel
injection system. When the ECM senses a problem in the system it will identify the
problem(s) by storing fault code number(s) in its memory. The fault code number(s) can be
retrieved from the ECM memory and can be used to identify the improperly operating circuit
or component.
There are two recommended methods of retrieving fault codes from the ECM:
1. Scan Tool
2. Blink Code Tool

ECM Self-Diagnostics

The ECM performs a continual self-diagnosis on certain control functions. This diagnostic
capability is complemented by the diagnostic procedures contained in this manual. The
ECM's language for communicating the source of a malfunction is a system of diagnostic
codes. The codes are four digit numbers preceded by the letter P. The prefIx letter P is the
abbreviation for Powertrain, an internationally standardize reference. When a malfunction
is detected by the ECM, a code is set and the Malfunction Indicator Lamp (MIL) is illuminated
in most instances.
NOTE: On factory instrumentation the MIL is a lamp with a check mark (n) on the colored
lens.
Page 5A-30
For more information on diagnosis and testing refer to SECTION 5E.
SERVICE MANUAL NUMBER 22
NOTICE
90-860074--1 FEBRUARY 2002