| REPAIR PROCEDURE: This bulletin involves operating the vehicle under specific
parameters to run or complete the OBD monitors. The number of monitors applicable to a
vehicle will vary by type of vehicle and emissions application. In addition, the
parameters to run each monitor will vary.
Preliminary Checks
1 . Perform a MIL bulb check by switching the ignition key "ON" (engine off).
The MIL will illuminate as a bulb check. If the MIL does not illuminate, repair the bulb
or bulb circuit.
2. Connect a DRB 1110 to the vehicle. Select DRB 1110 standalone, current model year
diagnostics, engine, DTC's and related functions, read DTC's.
3. Verify that no emission related DTC's are present and that the MIL is not illuminated
with the engine running.
NOTE: EMISSION RELATED DTCS AND MIL ILLUMINATION MAY PREVENT OTHER OBD MONITORS FROM
RUNNING. DTCS THAT ILLUMINATE THE MIL MUST BE REPAIRED BEFORE ATTEMPTING TO RUN THE
MONITORS.
OBD "CARB" Readiness Check
1 . With the DRB 111 select engine, OBD 11 monitors, CARB Readiness Status.
2. Read the monitor status. "YES" tells you that monitor has run and is ready
for an I/M test, "NO" tells you that the monitor must be run. If all monitors
listed read "YES", the vehicle can be returned to the customer for completion of
their I/M test. Only monitors that read "NO" must be run to read
"YES".
NOTE: THE MONITORS LISTED IN THE OBD "CARB" READINESS SCREEN ARE THE ONLY ONES
APPLICABLE FOR THE VEHICLE BEING WORKED ON.
The vehicle must be operated in various conditions (speed, temperature, etc.) for the
monitors to run. Each monitor includes a pre-test and monitor test that can be viewed on
the DRB 1110. The pre-test/monitor test screen lists all the preliminary parameters that
must be met along with the running parameters for that specific monitor to run. An example
of one screen is shown in Figure 1.
NOTE: 1997 AND PREVIOUS MODEL VEHICLES WILL HAVE A DIFFERENT LOOKING SCREEN. PRESS THE F1
KEY TO OBTAIN MONITOR RUN CONDITIONS. THE WAY IN WHICH THE MONITORS RUN WILL BE
SIMILAR.
The following explains how to interpret each section of the screen: (See Illustration)
PRE-TEST REQUIREMENTS
The pre-test requirements include all the operating parameters that must be met before
the actual test can run. The vehicle must be operated until each item within the pre-test
section are fulfilled.
LOW VALUE/ HIGH VALUE/ BAR GRAPH
The low value/high value provides the minimum and maximum operating conditions for each
item (ie ECT Range must be between 170 and 260 F in Figure 1). The bar graph will begin to
fill when the lowest value required for each item is met. This provides a visual
indication that the parameters are being met. The vehicle should be driven until most of
each pre-test bar graph is filled.
MONITOR REQUIREMENTS
Once all pre-test requirements are met, the vehicle must be brought within the parameters
listed in the monitor requirements section for the monitors to begin running. As the
monitor begins to run, the DRB 111 will begin to beep. This is an audible indication that
the test is in progress. If vehicle operation falls outside any of the parameters, the
beeping will stop. If this occurs, the technician must determine if the pre-test
requirements or the monitor requirements have fallen outside the window for the test and
the vehicle must be driven accordingly for the test to restart. When the monitor completes
its test, the D RB 111 will beep 3 consecutive times.
NOTE: THE PURGE FLOW PRE-TEST SCREEN WILL LOOK DIFFERENT THAN THE REST OF THE
PRE-TEST/MONITOR SCREENS. PRESS THE F1 KEY ON THE DRIB 1110 TO SEE A SIMILAR SCREEN FOR
THIS MONITOR.
MONITOR RUN PROCESS
The following will provide the most efficient order along with tips to help run through
the monitor tests quickly. The monitors listed include all possible monitors for either
Front Wheel Drive or Rear Wheel Drive vehicles. The vehicle being worked on may have fewer
monitors than the maximum available. Only those listed on the DRB 111 are applicable for
the vehicle being worked on. The only monitors that will require attention are those that
read "NO" under the OBD "CARB" Readiness Status screen.
Front Wheel Drive
1 . Evaporative Leak Detection Monitor - This test will require a cold start (possibly an
overnight soak either indoors or out depending on conditions). The ambient (outside)
temperature must be between 4' and 32' C (40 and 90 F) with the engine coolant
temperature within 6 C (10 F) of ambient/battery temperature. Once the above
criteria are met, use the pre-test/monitor test screen on the DRB 111 to determine
the remaining requirements.
2. Catalyst Monitor - The vehicle must be driven at highway speeds for the time listed in
the pre-test screen. If the vehicle is equipped with a manual transaxle, use fourth gear
to help meet the requirements.
3. EGR Monitor - It is necessary to maintain TPS, MAP, and RPM ranges listed in the
pre-test screen for this test to complete.
4. 02 Sensor Monitor - The vehicle must be driven and brought to a stop for the time
listed in the pre-test screen. Automatic transaxle vehicles must be left in drive during
the stop period.
5. Purge Monitor - To see a similar screen format as listed in Figure 1, press the F1 key
on the DRB 111 while in the Purge Flow Pre-Test screen. The purge free (PF) cells must
update and the monitor will attempt to run on every other throttle closure. Automatic
transaxle vehicles must be left in drive for the test to run. If all parameters are
met and the test still will not run, place your foot on the brake, open the throttle to
1/4 and then quickly close the throttle. This should allow the PF cells to update.
6. 02 Sensor Heater Monitor - The open throttle time for the 02 Heater pre-test must be
exceeded. This monitor will run after the ignition key is switched "Off'. After the
DRB 1110 switches to No Response (approximately 3 minutes) turn the ignition key
"On" and check the 02 Sensor Heater monitor status. It should have switched
to "YES". All other monitors should be completed before running this
test.
Rear Wheel Drive
1 . 02 Sensor Heater Monitor - This test will require a cold start (possibly an overnight
soak either indoors or outdoors depending on conditions). The ambient (outside)
temperature must be between -18 and 38 C (0 and 100 F with the engine coolant
temperature within 6 C (10 F) of ambient/battery temperature. Once the above
criteria are met, use the pre-test/monitor test screen on the DRB 111 to determine
the remaining requirements.
2. Evaporative Leak Detection Monitor - This test will require a cold start (possibly an
overnight soak either indoors or outdoors depending on conditions). The ambient (outside)
temperature must be between 4 and 32 C (40 and 90 F) with the engine coolant
temperature within 6 C (10 F) of ambient/battery temperature. Once the above
criteria are met, use the pre-test/monitor test screen on the DRB 111 to determine the
remaining requirements.
3. Catalyst Monitor - The vehicle must be driven at highway speeds for the time listed in
the pre-test screen. If the vehicle is equipped with a manual transmission, use 4th gear
to help meet the requirements.
4. 02 Sensor Monitor - The vehicle must be driven and brought to a stop for the time
listed in the pre-test screen. Automatic transmission vehicles must be left in drive
during the stop period.
5. Purge Monitor - To see a similar screen format as listed in Figure 1, press the F1 key
on the DRB 111 while in the Purge Flow Pre-Test screen. The purge free (PF) cells must
update and the monitor will attempt to run on every other throttle closure. Automatic
transmission vehicles must be left in drive for the test to run. If all parameters
are met and the test will still not run, place your foot on the brake, open the throttle
to 1/4 and then quickly close the throttle. This should allow the PF cells to
update. |
