EDI DIAGNOSIS SERVICE MANUAL NUMBER 22
Page 5E-70 90-860074--1 FEBRUARY 2002
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Code
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Explanation / Possible
Cause
P0725 PLAUSIBILITY WITH LDF
Problem most likely to be
found in MAP circuit.
Example: boost pressure
equals atmospheric pressure
but rpms are high.) Check
wiring.
P0725, P1725 DYNAMIC PLAUSIBILITY
The rpm sensor or
instrumented injector have
indicated a fault while the
engine was operating (that is,
over a period of time).
P0725, P1725 STATIC PLAUSIBILITY
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.
P1220
PERSISTENT NEGATIVE
GOVERNOR DEVIATION (WARM)
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.
P1220
PERSISTENT POSITIVE
GOVERNOR DEVIATION (WARM)
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.
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