Evaporative Emissions: Other Dodge Durango II

HIGH AND LOW LIMITS

The PCM compares input signal voltages from each input device with established high and low limits for the device. If the input voltage is not within limits and other criteria are met, the PCM stores a diagnostic trouble code in memory. Other diagnostic trouble code criteria might include engine RPM limits or input voltages from other sensors or switches that must be present before verifying a diagnostic trouble code condition.

OBD II Monitor Information

OBD II MONITOR INFORMATION

OBD II MONITOR RUN PROCESS

The following procedure has been established to-assist Chrysler Dealer Technicians in the field with enabling and running OBD II Monitors. The order listed in the following procedure is intended to allow the technician to effectively complete each monitor and to set the CARB Readiness Status in the least time possible.

Note. A. Once the monitor run process has begun, do not turn off the ignition. By turning the ignition key off, monitor enabling conditions will be lost. NVLD Monitor runs after key off. B. By performing a Battery Disconnect, or Selecting Erase DTCs, the CARB Readiness and all additional OBD II information will be cleared.

Monitor Preliminary Checks

1. Plug a SCAN TOOL into the vehicle's Data Link Connector (DLC).
2. Turn the ignition, KEY ON - ENGINE OFF. Watch for MIL lamp illumination during the bulb check. MIL lamp must have illuminated, if not, repair MIL lamp.
3. On the SCAN TOOL Select #1 Stand-alone.
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?.

1. *YES, then all monitors have been completed and this vehicle is ready to be I/M or Emission Tested.
2. *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 need to be met for each monitor. Each monitor has a Pre-Test screen to assist in running the monitor. For additional information, refer to the Daimler Chrysler Corporation Technical Training Workbook titled On Board Diagnostics: OBD II/EOBD, part number 81-699-01050.C. The most efficient order to run the monitors has been outlined below, including suggestions to aid the process.

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 conditions select the EVAP MON PRE-TEST in the SCAN TOOL, OBD II Monitors Menu. The Purge monitor 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 I AT 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 appropriate service 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.

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. Some trucks run the monitor at idle in drive. If the vehicle is equipped with a manual transmission, using 4th gear may assist in meeting the monitor running criteria. For the monitor run conditions, select the BANK 1 CAT MON PRE-TEST in the SCAN TOOL, OBD II Monitors Menu.

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 the monitor run conditions, select the EGR PRE-TEST in the SCAN TOOL, OBD II Monitors Menu.

O2 Sensor Heater Monitor

This monitor is now continuously running once the heaters are energized. Pass information will be processed at power down. For the monitor run conditions, select the 02S HEATER MON PRE-TEST in the SCAN TOOL, OBD II Monitors Menu.

3.7L V-6 / 4.7L V-8

The 3.7L V-6 and 4.7L V-8 engines are equipped with a closed crankcase ventilation system. The Positive Crankcase Ventilation (PCV) valve (6) is mounted to the oil filler housing (4).

The PCV valve is sealed to the oil filler housing with an o-ring (1).

Scheme 14

Two interconnected breathers (1) threaded into the rear of each cylinder head are used with the system.

The system also includes the air cleaner housing and various tubes and hoses to connect the system components.

Scheme 15

5.7L V-8

The 5.7L V-8 engine is equipped with a closed crank-case ventilation system and a Positive Crankcase Ventilation (PCV) valve.

A PCV valve (4) mounted into the top of the intake manifold (1), located to the right / rear of the throttle body (2) is used.

Scheme 16

The PCV valve (1) is sealed to the intake manifold with two o-rings (2).

The system also consists of passages in the intake manifold, and various tubes and hoses to connect the system components.

Scheme 17

The PCV valve (6) is located on the oil filler tube (4). Two locating tabs are located on the side of the valve (2). These 2 tabs fit into a cam lock (3) in the oil filler tube. An o-ring (1) seals the valve to the filler tube.

Scheme 18

1. Disconnect PCV line/hose (5) by disconnecting rubber hose at PCV valve fitting.
2. Remove PCV valve at oil filler tube by rotating PCV valve downward (counter-clockwise) until locating tabs (2) have been freed at cam lock (3). After tabs have cleared, pull valve straight out from filler tube. To prevent damage to PCV valve locating tabs, valve must be pointed downward for removal. Do not force valve from oil filler tube.
3. After valve is removed, check condition of valve o-ring (1).

The PCV valve (4) is mounted into the top of the intake manifold (1). This is located to the right / rear of the throttle body (2).

Scheme 19

Scheme 20

1. The PCV valve is sealed to the intake manifold with 2 O-rings (2).
2. Remove PCV valve by rotating counter-clockwise 90 degrees until locating tabs (3) have been freed. After tabs have cleared, pull valve straight up from intake manifold.
3. After valve is removed, check condition of 2 valve O-rings (2).

3.7L V6 / 4.7L V-8

The PCV valve is located on the oil filler tube. Two locating tabs are located on the side of the valve. These 2 tabs fit into a cam lock in the oil filler tube. An o-ring seals the valve to the filler tube.

1. Return PCV valve back to oil filler tube by placing valve locating tabs into cam lock. Press PCV valve in and rotate valve upward. A slight click will be felt when tabs have engaged cam lock. Valve should be pointed towards rear of vehicle.
2. Connect PCV line/hose and rubber hose to PCV valve.

5.7LV-8

1. Clean out intake manifold opening.
2. Check condition of 2 o-rings on PCV valve.
3. Apply engine oil to 2 o-rings.
4. Place PCV valve into intake manifold and rotate 90 degrees clockwise for installation.