Equipped With ABS

P0501-VEHICLE SPEED SENSOR 1 PERFORMANCE (Equipped with ABS)



- When Monitored:
With the engine running, transmission not in park or neutral, brakes not applied, and engine rpm greater than 1500.

- Set Condition:
This code will set if no vehicle speed signal is received from the ABS Module for more than 11 seconds for 2 consecutive trips. Two Trip Fault. Three good trips to turn off the MIL.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure

1. ACTIVE DTC

NOTE: The following items must be performed before continuing.
- Pinion Factor and Tire Size MUST be programmed in the ABS Module.
- All Bus Communication DTCs MUST be diagnosed.
- All related Vehicle Speed and Wheel Speed DTCs that may be active in the ABS Module MUST be diagnosed. Refer to the ABS diagnostic information for the correct procedure.

1. Ignition on, engine not running.
2. With a scan tool, read DTCs.

Is the DTC active at this time?

Yes

- Go To 2

No

- Refer to the CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. Checking for an Intermittent DTC.

2. VISUAL INSPECTION

NOTE: This code can set due following conditions.
- Unequal tire circumference between the tires on the vehicle.
- Front or Rear wheels moving while the opposite wheels are not. (i.e., wheels slipping on loose gravel, ice or hard acceleration)

1. Check tire pressure of all the tires.
2. Check tire wear on all the tires.
3. Ask the customer what the road and driving conditions were like when the fault set.

Were any of the above conditions found?

Yes

- Repair as necessary. If the code set during a front OR rear wheel spin condition, no repair is necessary.
- Perform the PCM VERIFICATION TEST. PCM Verification Test

No

- Go To 3

3. POWERTRAIN CONTROL MODULE (PCM)

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.

Were there any problems found?

Yes

- Repair as necessary.
- Perform the PCM VERIFICATION TEST. PCM Verification Test

No

- Replace and program the Powertrain Control Module.
- Perform the PCM VERIFICATION TEST. PCM Verification Test