Mercury MerCruiser D2.8L D-Tronic Service Manual page 638

EDI DIAGNOSIS
Display Terminology (Continued)
Related to
Scan Tool
P0725
P0725, P1725 DYNAMIC PLAUSIBILITY
P0725, P1725 STATIC PLAUSIBILITY
P1220
P1220
Page 5E-70
Displayed Extended Information
As Shown On Scan Tool
Code
PLAUSIBILITY WITH LDF
PERSISTENT NEGATIVE
GOVERNOR DEVIATION (WARM)
PERSISTENT POSITIVE
GOVERNOR DEVIATION (WARM)
SERVICE MANUAL NUMBER 22
Explanation / Possible
Cause
Problem most likely to be
found in MAP circuit.
Example: boost pressure
equals atmospheric pressure
but rpms are high.) Check
wiring.
The rpm sensor or
instrumented injector have
indicated a fault while the
engine was operating (that is,
over a period of time).
This fault occurs when the
instrumented injector signal
(speed) is more than a
specified amount but the rpm
sensor is less than a specific
amount. Check both circuits.
When the engine is warm and
the monitored fuel quantity is
greater at a preset engine
speed than the real position of
the fuel quantity actuator.
Check wiring first. If
connections are OK, the pump
itself should be replaced.
When the engine is warm and
the monitored fuel quantity is
less at a preset engine speed
than the real position of the
fuel quantity actuator. Check
wiring first. If connections are
OK, the pump itself should be
replaced.
90-860074--1 FEBRUARY 2002