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.
P0501-VEHICLE SPEED SIGNAL PERFORMANCE DIAGNOSTIC TEST REFERENCE
| TEST | ACTION | APPLICABILITY |
|---|---|---|
| 1 | Ignition on, engine not running.
NOTE:
Any VSS DTCs in the BCM and CAB Module must be properly diagnosed before continuing. Perform the diagnostic procedure for VSS faults in CHASSIS DIAGNOSTIC PROCEDURES . If those diagnostics lead to replacing a control module, continue the diagnostics found here. 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 2 No --> Refer to the INTERMITTENT CONDITION SYMPTOM . Perform POWERTRAIN VERIFICATION TEST VER - 5 . |
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| 2 | Turn the ignition off. Disconnect the C1 PCM harness connector. Disconnect the BCM harness connectors. Ignition on, engine not running. Measure the voltage of the (B22) Vehicle Speed Signal circuit at the BCM harness connector. Is the voltage above 6.0 volts? Yes --> Repair the short to voltage in the (B22) Vehicle Speed Signal circuit. Perform POWERTRAIN VERIFICATION TEST VER - 5 . No --> Go To 3 |
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| 3 | Turn the ignition off.
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 (B22) Vehicle Speed Signal circuit from the BCM harness connector and the appropriate terminal of special tool #8815. Is the resistance below 5.0 ohms? Yes --> Go To 4 No --> Repair the open in the (B22) Vehicle Speed Signal circuit. Perform POWERTRAIN VERIFICATION TEST VER - 5 . |
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| 4 | Measure the resistance between ground and the (B22) Vehicle Speed Signal circuit in the BCM harness connector. Is the resistance below 100 ohms? Yes --> Repair the short to ground in the (B22) Vehicle Speed Signal circuit. Perform POWERTRAIN VERIFICATION TEST VER - 5 . No --> Go To 5 |
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| 5 |
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 is no possible causes remaining, view repair.RepairReplace and program the Powertrain Control Module per Service Information.Perform POWERTRAIN VERIFICATION TEST VER - 5 . |
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