Diagnostic Procedure
WARNING: This page is about a different car, the 2005 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
P0499-NVLD CANISTER VENT VALVE SOLENOID CIRCUIT HIGH DIAGNOSTIC TEST REFERENCE
| TEST | ACTION | APPLICABILITY |
|---|---|---|
| 1 | Start by reading PCM DTC(s) and record the related Freeze Frame data in any DTC(s) are present. Check the vehicle repair history. If the vehicle has a repair history that pertains to the customer's current complaint, review the repair. Inspect the vehicle for any aftermarket accessories that may have been installed incorrectly. Check for any service bulletin(s) related to the customer's complaint or DTC(s). If a service bulletin applies, follow the instructions per service bulletin. Did the service bulletin repair the customer's complaint? Yes --> Testing Complete. Perform POWERTRAIN VERIFICATION TEST VER - 5 . No --> Go To 2 |
All |
| 2 | Ignition on, engine not running. With the DRBIII®, read DTCs and record the related Freeze Frame data. Is the Good Trip Counter displayed and equal to zero? Yes --> Go To 3 No --> Refer to the INTERMITTENT CONDITION SYMPTOM . Perform POWERTRAIN VERIFICATION TEST VER - 5 . |
All |
| 3 | Turn the ignition off. Disconnect the NVLD Assembly harness connector. Measure the resistance of the NVLD Solenoid coil. Is the resistance between 7.5 to 8.5 ohms? Yes --> Go To 4 No --> Replace the NVLD Assembly. Perform POWERTRAIN VERIFICATION TEST VER - 5 . |
All |
| 4 | Turn the ignition off. Disconnect the NVLD Assembly harness connector. Disconnect the PCM harness connector. Take this measurement with the Ignition in the off (lock) position and in the Ignition on, engine off position. Measure the voltage on the NVLD Sol Control circuit in the NVLD Assembly harness connector. Is the voltage above 1.0 volt? Yes --> Repair the short to battery voltage in the NVLD Solenoid Control circuit. Perform POWERTRAIN VERIFICATION TEST VER - 5 . No --> Go To 5 |
All |
| 5 | Turn the ignition off. Disconnect the NVLD Assembly harness connector. Disconnect the PCM harness connector.
CAUTION:
DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMINALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS. Measure the resistance of the NVLD Sol Control circuit from the NVLD Assembly harness connector to the appropriate terminal of special tool #8815. Is the resistance below 5.0 ohms? Yes --> Go To 6 No --> Repair the open in the NVLD Sol Control circuit. Perform POWERTRAIN VERIFICATION TEST VER - 5 . |
All |
| 6 | Turn the ignition off. Disconnect the NVLD Assembly harness connector. Measure the resistance between the Ground circuit and ground. Is the resistance below 5.0 ohms? Yes --> Go To 7 No --> Repair the open in the Ground circuit. Perform POWERTRAIN VERIFICATION TEST VER - 5 . |
All |
| 7 |
NOTE:
Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.If there are no possible causes remaining, view repair.RepairReplace and program the Powertrain Control Module per Service Information.Perform POWERTRAIN VERIFICATION TEST VER - 5 . |
All |