Isuzu Trooper 1999 Workshop Manual page 970

locks, improperly formed or damaged terminals, and
poor terminal-to-wire connection.
f Damaged harness – Inspect the wiring harness for
damage. If the harness appears to be OK, observe the
Bank 1 HO2S 1 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 P0133 cannot be duplicated, 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.
2. Verifies that the fault is currently present.
3. HO2S transition time, ratio mean volts and switching
DTCs set for multiple sensors indicate probable
contamination. Before replacing the sensors,
isolate and correct the source of the contamination
to avoid damaging the replacement sensors.
TROOPER 6VE1 3.5L ENGINE DRIVEABILITY AND EMISSIONS
6E–169