Isuzu 2000 Trooper Workshop Manual page 1349

6E–480
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P1523 Actuator Control Return Performance
Circuit Description
D The throttle position (TP) sensor circuit provides a
voltage signal relative to throttle position (blade angle).
The throttle blade angle will vary about 8 % at
closed throttle to about 92 % at wide open
throttle(WOT).
D The DC motor circuit provides a voltage signal relative
to command throttle position (blade angle).
D This DTC ditects if the throttle return to the default
position at key on, steady state.
Conditions for setting the DTC
D The ignition is "ON".
D Normalized TPS is less than 0 % but Normalized TPS
is more than 25 %.
Action Taken When the DTC Sets
D The PCM will store condition which were present when
the DTC was set as Freeze Frame and in the Failure
Records data.
Conditions for Clearing the MIL/DTC
D The PCM will turn the MIL "OFF" on the third
consecutive trip cycle during which the diagnostic has
been run and the fault condtion is no longer present.
D A history DTC P1523 will clear after 40 cosecutive trip
cycle during which the warm up cycles have occurred
without a fault.
D DTC P1523 can be cleared using the Tech 2 "Clear
Info" function or by disconnecting the PCM battery
feed.
Diagnostic Aids
An intermittent may be caused by the following:
D Poor connectons.
D Mis routed harness.
D Rubbed through wire insulation.
D Broken wire inside the insulation.
Check for the following conditions:
D Poor connection at PCM-Inspect harness connectors
for backed out terminals, improper mating, broken
locks, improperly formed or damaged terminals, and
poor terminal to wire connection.
D Damaged harness-Inspect the wiring harness for
damage. If the harness appears to be OK, observe the
TP sensor 1, TP sensor 2 display on the Tech 2 while
moving connectors and wiring harnesses related to the
sensor.
A change in the display will indicate the location of
the fault. If DTC P1523 cannot be duplicated, the
information included in the Faillure Records data
can be useful in determined vehicle mileage since
the DTC was last set.
If it is determined that the DTC occurs
intermittently, performing the DTC P1523
Diagnostic Chart may isolate the cause of the
fault.
D06RY00088