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GENERAL INFORMATION
OBDII Monitor Run Process
NGC Vehicles
The following procedure has been established to
assist Technicians in the field with enabling and
running OBDII Monitors. The order listed in the
following procedure is intended to allow the techni-
cian to effectively complete each monitor and to set
the CARB Readiness Status in the least time pos-
sible.
**NOTE**
A. Once the monitor run process has begun, do
not turn off the ignition. By turning the igni-
tion key off, monitor enabling conditions will
be lost. The NVLD Monitor runs after key off.
B. By performing a Battery Disconnect, or Se-
lecting Erase DTCs, the CARB Readiness and
all additional OBDII information will be
cleared.
Monitor Preliminary Checks:
1. Plug a DRBIII into the vehicle's DLC.
2. Turn the ignition to the RUN POSITION. Watch
for MIL lamp illumination during the bulb
check. MIL lamp must have illuminated, if not,
repair MIL lamp.
3. On the DRB III Select #1 DRB III Standalone.
4. Select #1 1998-2004 Diagnostics
5. Select #1 Engine
6. Select #2 DTCs and Related Functions
7. Select #1 Read DTCs
*Verify that No Emissions Related DTCs are
Present.
*If an Emissions DTC is Present, the OBD II
Monitors may not run and the CARB Readiness
will not update.
*The Emissions related DTC, will need to be
repaired, then cleared. By clearing DTCs, the
OBD Monitors will need to be run and completed
to set the CARB Readiness Status.
8. Return to Engine Select Function Menu and
Select #9, OBD II Monitors.
9. Select #3 CARB Readiness Status.
Do all the CARB Readiness Status Locations read
YES?
*YES, then all monitors have been completed and
this vehicle is ready to be I/M or Emission Tested.
*NO, then the following procedure needs to be
followed to run/complete all available monitors.
**NOTE**
A. Only the monitors, which are not YES in the
CARB Readiness Status, need to be completed.
B. Specific criteria must be met for each monitor to
run. Each monitor has a Pre-Test screen to
assist in running the monitor.
For additional information, refer to the Chrysler
Corporation Technical Training Workbook titled
On Board Diagnostics: OBDII/EOBD, part num-
ber 81-699-01050.
The most efficient order to run the monitors has
been outlined below, including suggestions to aid
the process.
A. NATURAL VACUUM LEAK DETECTION WITH
PURGE MONITOR
This monitor requires a cool down cycle, usually
an overnight soak for at least 8 hours without the
engine running. The ambient temperature must
decrease overnight – parking the vehicle outside is
advised. To run this test the fuel level must be
between 15-85% full. For the monitor run condi-
tions select the EVAP MON PRE-TEST in the
DRB III , OBD II Monitors Menu. The Purge mon-
itor will run if the small leak test reports a pass.
Criteria for NVLD monitor.
1. Engine off time greater than @ one hour
2. Fuel Level between 15% and 85%
3. Start Up ECT and IAT within 10°C (18°F).
4. Vehicle started and run until Purge Monitor
reports a result.
NOTE: If the vehicle does not report a result
and the conditions where correct. It may take
up to two weeks to fail the small leak monitor.
DO NOT use this test to attempt to determine
a
fault.
Use
the
information procedure for finding a small
leak. If there are no faults and the conditions
are correct this test will run and report a
pass. Note the Small leak test can find leaks
less than 10 thousands of an inch. If a small
leak is present it takes approximately one
week of normal driving to report a failure.
B. CATALYST/O2 MONITOR
With NGC, Catalyst and O2 Monitor information
are acquired and processed at the same time. Most
vehicles will need to be driven at highway speed
(<50 mph) for a few minutes. If the vehicle is
equipped with a manual transmission, using 4
gear may assist in meeting the monitor running
criteria. For the monitor run conditions, select the
BANK 1 CAT MON PRE-TEST in the DRB III ,
OBD II Monitors Menu.
C. EGR MONITOR
The EGR monitor now runs in a closed throttle
decel or at idle on a warm vehicle. However, it is
necessary to maintain the TPS, Map and RPM
ranges to allow the monitor to complete itself. For
4
appropriate
service
th
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