FREE REPAIR MANUALS & LABOR GUIDES 1982-2013 Vehicles
Courtesy of Operation CHARM: Car repair manuals for everyone.
Home >> Dodge or Ram Truck >> 2012 >> RAM 3500 Truck 2WD L6-6.7L DSL Turbo High Output >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P0501

P0501






P0501-VEHICLE SPEED SENSOR 1 PERFORMANCE

For a complete wiring diagram, refer to the Wiring Information.

Theory of Operation

The Powertrain Control Module (PCM) monitors the vehicle speed via the Anti-Lock Brake Module over the CAN BUS. When the PCM sees a high torque and high boost condition for a period of time and the vehicle speed has continually reported 0 MPH, a DTC is set. This monitor is a one trip fault.

- When Monitored:
While the engine is running.

- Set Condition:
The PCM indicates a high torque and high boost condition, and the VSS has continually reported zero.





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

1. DTC IS ACTIVE
1. Turn the ignition on.
2. With the scan tool, clear DTCs.
3. Test drive the vehicle.
4. With the scan tool, select View DTCs.

Is the status Active for this DTC?

Yes

- Go To 2

No

- Perform the INTERMITTENT CONDITION diagnostic procedure. Intermittent Condition Test

2. INSPECT THE WHEEL SPEED SENSOR
1. Turn the ignition off.
2. Inspect the Wheel Speed Sensor for proper mounting.
3. Inspect the Wheel Speed Sensor harness and connector.
4. Inspect the Wheel Speed Sensor for excessive debris on the sensor.

Were any problems found?

Yes

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

No

- Go To 3

3. CHECK FOR TONE WHEEL DAMAGED/MISSING
1. Inspect the Tone Wheel.

NOTE: The Tone Wheel Teeth should be perfectly square, not bent or nicked.

Were any problems found?

Yes

- Replace the Tone Wheel.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

No

- Go To 4

4. CHECK FOR EXCESSIVE WHEEL SPEED SENSOR AIR GAP
1. Measure the Wheel Speed Sensor Air Gap.

Were any problems found?

Yes

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

No

- Go To 5

5. CHECK FOR WHEEL BEARING LOOSE/BINDING
1. Inspect the wheel bearings for excessive run out or improper clearance.

Were any problems found?

Yes

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

No

- Go To 6

6. CHECK THE (B222) REAR WHEEL SPEED SENSOR SUPPLY CIRCUIT FOR A SHORT TO GROUND




1. Turn the ignition off.
2. Disconnect the Rear Wheel Speed Sensor harness connector.
3. Disconnect the Anti-lock Brake Module harness connector.

NOTE: Check connector - Clean/repair as necessary.

4. Measure the resistance between the (B222) Rear Wheel Speed Sensor Supply circuit and ground.

Is the resistance above 5.0 Ohms?

Yes

- Go To 7

No

- Repair the (B222) Rear Wheel Speed Sensor Supply circuit for a short to ground.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

7. CHECK THE (B22) REAR WHEEL SPEED SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND




1. Measure the resistance between the (B22) Rear Wheel Speed Sensor Signal circuit and ground.

Is the resistance above 5.0 Ohms?

Yes

- Go To 8

No

- Repair the (B22) Rear Wheel Speed Sensor Signal circuit for a short to ground.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

8. CHECK THE (B222) REAR WHEEL SPEED SENSOR SUPPLY CIRCUIT FOR AN OPEN/HIGH RESISTANCE




1. Measure the resistance of the (B222) Rear Wheel Speed Sensor Supply circuit.

Is the resistance below 5.0 Ohms?

Yes

- Go To 9

No

- Repair the (B222) Rear Wheel Speed Sensor Supply circuit for an open or high resistance.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

9. CHECK THE (B22) REAR WHEEL SPEED SENSOR SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE




1. Measure the resistance of the (B22) Rear Wheel Speed Sensor Signal circuit.

Is the resistance below 5.0 Ohms?

Yes

- Go To 10

No

- Repair the (B22) Rear Wheel Speed Sensor Signal circuit for an open or high resistance.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

10. CHECK THE (B222) REAR WHEEL SPEED SENSOR SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE




1. Turn the ignition on.
2. Measure the voltage of the (B222) Rear Wheel Speed Sensor Supply circuit.

Is there any voltage present?

Yes

- Repair the (B222) Rear Wheel Speed Sensor Supply circuit for a short to voltage.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

No

- Go To 11

11. CHECK THE (B22) REAR WHEEL SPEED SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE




1. Measure the voltage of the (B22) Rear Wheel Speed Sensor Signal circuit.

Is there any voltage present?

Yes

- Repair the (B22) Rear Wheel Speed Sensor Signal circuit for a short to voltage.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

No

- Go To 12

12. CHECK FOR THE (B222) REAR WHEEL SPEED SENSOR SUPPLY CIRCUIT SHORTED TO THE (B22) REAR WHEEL SPEED SENSOR SIGNAL CIRCUIT




1. Turn the ignition off.
2. Measure the resistance between the (B222) Rear Wheel Speed Sensor Supply circuit and the (B22) Rear Wheel Speed Sensor Signal circuit at the Anti-lock Brake Module harness connector.

Is the resistance below 10k Ohms?

Yes

- Repair the (B222) Rear Wheel Speed Sensor Supply circuit for a short to the (B22) Rear Wheel Speed Sensor Signal circuit.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

No

- Go To 13

13. CHECK THE REAR WHEEL SPEED SENSOR




1. Turn the ignition off.
2. Connect the Rear Wheel Speed Sensor harness connector.
3. Measure the resistance between the (B222) Rear Wheel Speed Sensor Supply circuit and (B22) Rear Wheel Speed Sensor Signal circuit at the Anti-lock Brake Module harness connector.

NOTE: The resistance should be approximately 1600-2300 Ohms at 76° F (24.5° C).

Is the resistance within the noted range?

Yes

- Go To 14

No

- Replace the Rear Wheel Speed Sensor.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

14. CHECK THE ANTI-LOCK BRAKE MODULE
1. Turn the ignition off.
2. Inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires.
3. Inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals.
4. Perform any Technical Service Bulletins that may apply.

Were any problems found?

Yes

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

No

- Replace the Anti-lock Brake Module.
- Perform the ABS VERIFICATION TEST. ABS Verification Test.

pro multis Credits:Operation CHARM About Operation CHARM