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.
DIAGNOSTIC PROCEDURES - P0501-VEHICLE SPEED SENSOR PLAUSIBILITY
| TEST | ACTION | APPLICABILITY |
|---|---|---|
| 1 |
NOTE:
If the ECM displays multiple CAN Bus related DTC's, check the CAN Bus circuits at the ECM harness connector for proper connection before continuing with this test.
NOTE:
If the ECM detects and stores a DTC, the ECM also stores the engine/vehicle operating conditions under which the DTC was set. Some of these conditions are displayed on the DRB at the same time the DTC is displayed.
NOTE:
Before erasing stored DTCs, record these conditions. Attempting to duplicate these conditions may assist when checking for an active DTC. Turn the ignition on.With the DRB, erase ECM DTCs.Test drive the vehicle.With the DRB, read the ECM DTC's.Does the DRB display this DTC?Yes --> Go To 2No --> Go To 4 |
All |
| 2 | Turn the ignition on. With the DRB, check for Controller Antilock Brakes DTCs.
NOTE:
The ECM Receives vehicle speed messages via CAB Bus from the ABS module. An interruption on the CAN Bus can cause this fault to set. Are any related CAB DTCs present? Yes --> Refer to CHASSIS DIAGNOSTIC PROCEDURES for problems related to CAB DTCs before continuing. Perform ROAD TEST VERIFICATION - VER-2 . No --> Go To 3 |
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| 3 |
NOTE:
The TCM Receives vehicle speed messages via CAB Bus from the ABS module. An interruption on the CAN Bus can cause this fault to set. Turn the ignition on.With the DRB, check the TCM for DTCs.Are any ABS CAN Bus Message or Vehicle Speed related TCM DTCs present?Yes --> Replace the CAB in accordance with the Service Information. Perform ROAD TEST VERIFICATION - VER-2 .No --> Replace and program the Engine Control Module in accordance with the Service Information.Perform ROAD TEST VERIFICATION - VER-2 . |
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| 4 |
WARNING:
WHEN THE ENGINE IS OPERATING, DO NOT STAND IN A DIRECT LINE WITH THE FAN. DO NOT PUT YOUR HANDS NEAR THE PULLEYS, BELTS OR FAN. DO NOT WEAR LOOSE CLOTHING.
NOTE:
The conditions that set the DTC are not present at this time. The following list may help in identifying the intermittent condition. With the engine running at normal operating temperature, monitor the DRB parameters related to the DTC while wiggling the wiring harness. Look for parameter values to change and/or a DTC to set.Review the DTC When Monitored and Set Conditions. If possible, try to duplicate the conditions under which the DTC was set.Refer to any Technical Service Bulletins (TSB) that may apply.Visually inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires.Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.Were any of the above conditions present?Yes --> Repair as necessary.Perform ROAD TEST VERIFICATION - VER-2 .No --> Test Complete. |
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