Isuzu 2000 Trooper Workshop Manual page 1313

6E–444
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P1299 ETC Forced Engine Shutdown Mode
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 The mass air flow (MAF) sensor measures the amount
of air which passes through it into the engine during a
given time. The powertrain Control Module (PCM)
uses the mass air flow information to monitor engine
operating conditions for fuel delivery calculations. A
laege quantitiy of air entering the engine indicates an
accleration or high load situation, while a small quantity
or air indicates deceleration or idle.
The MAF sensor produces a frequency signal
which can be monitored using a Tech 2. The
frequency will vary within a range of around 4 to
7g/s at idle to around 25 to 40g/s at maximum
engine load.
D This DTC ditects if the system is in ECT Forced Engine
Shutdown Mode.(Fail safe Mode)
Conditions for setting the DTC
D The ignition is "ON".
D ECT Forced Engine Shutdown Mode is active. (Fail
safe Mode)
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 P1299 will clear after 40 cosecutive trip
cycle during which the warm up cycles have occurred
without a fault.
D DTC P1299 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 connections.
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
D06RY00090