P1501-VEHICLE SPEED SENSOR 1/2 CORRELATION - DRIVE WHEELS





For a complete wiring diagram Refer to Section 8W.



Possible Causes
ACTIVE BUS OR COMMUNICATION DTCS
TIRE CIRCUMFERENCE
PCM

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).



Diagnostic Test

1. ACTIVE DTC

Ignition on, engine not running.

NOTE: Check for any Bus Communication DTCs. If no Bus Communication DTCs are set, check for active DTCs stored in the Anti-Lock Brake Module. Any Bus Communication DTCs or VSS DTCs in the Anti-Lock Brake Module must be properly diagnosed before continuing.


Start the engine.
Allow the engine to idle.

NOTE: It may be necessary to drive the vehicle for the fault to become Active.


With a scan tool, select View DTCs.

Is the status Active for this DTC?

Yes


No

2. VISUAL INSPECTION

NOTE: This code can set due to tire circumference differences and from the front or rear wheels being on a slippery surface while the opposite tires are not.


This code may also set on a hard acceleration on loose gravel or during other off road driving conditions.
Check tire pressure of all the tires.
Check tire wear on all the tires.
Ask the customer what the road and driving conditions were like when the fault set.

Were any problems found?

Yes


No

3. 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


No