Isuzu 2000 Trooper Workshop Manual page 1196

Diagnostic Aids
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
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.
Reviewing the Failure Records vehicle mileage since the
diagnostic test last failed may help determine how often
the condition that caused the DTC to be set occurs. This
may assist in diagnosing the condition.
Test Description
Number(s) below refer to the step number(s) on the
Diagnostic Chart.
7. Difficulty completing the DTC P0430 "Status This
Ign." test may be encountered in areas where test
conditions cannot be maintained easily, especially in
urban areas. To minimize the amount of driving
required to complete the DTC P0430 "Status This
Ign." test, use the following procedure:
D Allow the engine to warm completely.
D With the vehicle in "Park," monitor mass air flow on
the Tech 2 and hold part throttle to maintain a
reading of over 12 g/second for at least 2 minutes.
This will achieve the "warm catalyst" required for
running the test.
D Operate the vehicle in second or third gear to remain
in the DTC P0430 test conditions described in
"Conditions for Setting the DTC" as much as
possible. If you must stop the vehicle, maintain the
"warm catalyst" criteria as follows:
– Place the vehicle in "Park" or "Neutral."
– Hold part throttle to maintain a mass air flow
reading of over 15 g/second for the duration of the
stop.
The "TWC Monitor Test Counter" displayed on the Tech 2
may be used to monitor the progress of the TWC
diagnostic. To complete the TWC diagnostic with a good
catalyst, the counter must be allowed to increment to 49
samples and roll over to 0 at least twice.
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
6E–327