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Home >> Dodge and Ram >> 2000 >> Durango 4.7 N, Part Time >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self Diagnostics >> Diagnostic Tests >> Test VER-6: Leak Detection Pump (LDP) Verification >> Final Procedure
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Final Procedure

    NOTE: A Leak Detection Pump (LDP) monitor test mode is used when performing this test to verify repairs and check operation of leak detection pump system. LDP monitor test mode may also be referred to as LDP dealer test mode. When performing this test, the operating mode of the Powertrain Control Module (PCM) will be changed. It is critical that the LDP monitor test mode must not be interrupted. If LDP monitor test mode is interrupted, the PCM will remain in the changed mode. This will cause the PCM to illuminate the MIL for 8-10 miles of driving and no DTCs will being stored in the PCM. Clearing DTCs from the PCM will not change the MIL operation. If a vehicle is found with the PCM stuck in this changed mode, LDP monitor test should be performed in its entirety so proper PCM operating mode may be obtained.
  1. Inspect vehicle to ensure all components related to the repair are properly connected. Reassemble and reconnect components as necessary. If any DTCs have not been diagnosed, perform appropriate DTC test and finish diagnosing remaining DTCs as necessary. If all DTCs have been diagnosed and repaired, go to next step.
  2. Connect scan tool to Data Link Connector (DLC). Ensure all accessories are off. Start engine and allow engine to idle. Ensure shift lever is in Park and throttle is in idle position.
    NOTE: Engine must remain at idle with shift lever in Park and throttle at idle position when performing LDP monitor test. LDP monitor test will only store a small leak DTC to indicate there is a problem with the system. System failure may have been caused by a large leak, but the PCM will only set the small leak DTC to indicate that a failure occurred during the test.
  3. Using scan tool in SYSTEM TESTS mode, perform LDP MONITOR TEST and follow instructions as displayed on scan tool. If a DTC for a small leak is set, the repair is not complete. Check for related Technical Service Bulletins (TSBs) and perform appropriate DTC test. If any other DTCs were reset, perform appropriate DTC test. If no other DTCs exist and LDP monitor test passed, repair is now complete.
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