Isuzu 1999 RODEO Workshop Manual page 799

6E1–172 RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
Conditions for Clearing the MIL/DTC
f The PCM will turn the MIL OFF on the third consecutive
trip cycle during which the diagnostic has been run and
the fault condition is no longer present.
f A history Diagnostic Trouble Code P0171 will clear
after 40 consecutivewarm–up cycles have occurred
without a fault.
f Diagnostic Trouble Code P0171 can be cleared by
using the Scan Tool's "Clear Info" function.
Diagnostic Aids
Check for the following conditions:
f 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.
f Damaged harness – Inspect the wiring harness for
damage; shorts to ground, shorts to battery positive
and open circuits. 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
engine harness. 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 Diagnostic Trouble Code 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.Diagnostic Trouble Codes other than P0171 may
indicate a condition present which may cause a lean
condition. If this is the case, repairing the condition
which caused the other Diagnostic Trouble Code will
most likely correct the Diagnostic Trouble Code
P0171.
4.If the Diagnostic Trouble Code P0171 test passes
while the Failure Records conditions are being
duplicated, the lean condition is intermittent. Refer
to Diagnostic Aids or Symptoms for additional
information on diagnosing intermittent problems.