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Home >> Dodge or Ram Truck >> 2005 >> RAM 3500 Truck 2WD L6-5.9L DSL Turbo VIN C >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> Manufacturer Code Charts >> Antilock Brake System (ABS) >> 27 - Intermittent Signal From Right Front Sensor

27 - Intermittent Signal From Right Front Sensor

INTERMITTENT SIGNAL FROM RIGHT FRONT SENSOR-27





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

When Monitored
Ignition turned on for at least 3.5 seconds. Average filtered speed for the two front wheels above 6 km/h (4 MPH). Speed for each suspect sensor above 32 km/h (20 MPH) (brake applied or ABS active) or 19 km/h (12 MPH) (brake released or ABS inactive).

Set Condition
When there is a sudden change of output signal from the sensor.

Possible Causes
- INTERMITTENT LEFT FRONT WHEEL SPEED SENSOR DTC
- RIGHT FRONT WHEEL SPEED SENSOR (+) CIRCUIT SHORT TO GROUND
- RIGHT FRONT WHEEL SPEED SENSOR (-) CIRCUIT SHORT TO GROUND
- RIGHT FRONT WHEEL SPEED SENSOR (+) CIRCUIT OPEN
- RIGHT FRONT WHEEL SPEED SENSOR (-) CIRCUIT OPEN
- RIGHT FRONT WHEEL SPEED SENSOR (+) CIRCUIT SHORTED TO VOLTAGE
- RIGHT FRONT WHEEL SPEED SENSOR (-) CIRCUIT SHORTED TO VOLTAGE
- RIGHT FRONT WHEEL SPEED SENSOR (-) CIRCUIT SHORTED TO THE RIGHT FRONT WHEEL SPEED
- SENSOR (+) CIRCUIT
- TONE WHEEL
- EXCESSIVE LEFT FRONT WHEEL SPEED SENSOR AIR GAP
- WHEEL BEARING
- RIGHT FRONT WHEEL SPEED SENSOR
- CONTROLLER ANTI-LOCK BRAKE

Diagnostic Test
1.DTC IS ACTIVE
Turn the ignition on.
With the DRBIII (R) clear DTCs.
Turn the ignition off.
Turn the ignition on.
With the DRBIII (R) read DTCs.

Does the DRBIII (R) display the DTC??
Yes >> Go To 2
No >> Go To 16

2. CONTROLLER ANTI-LOCK BRAKE HARNESS CONNECTOR INSPECTION
Turn the ignition off.
Inspect the CAB wiring harness. Look for any chafed, pierced, pinched, or partially broken wires.
Inspect the CAB wire harness connectors. Look for broken, bent, pushed out, or corroded terminals.

Were any problems found?
Yes >> Clean or Repair as necessary in accordance with the Service Information.

No >> Go To 3

3. WHEEL SPEED SENSOR INSPECTION
Turn the ignition off.
Inspect the Wheel Speed Sensor for proper mounting.
Inspect the Wheel Speed Sensor harness and connector.
Inspect the Wheel Speed Sensor for excessive debris on the sensor.

Were any problems found?
Yes >> Repair as necessary in accordance with the Service Information.
Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test
No >> Go To 4

4. TONE WHEEL DAMAGED/MISSING
Inspect the Tone Wheel in accordance with the Service Information.

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

Were any problems found?
Yes >> Replace the Tone Wheel in accordance with the Service Information.
Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test
No >> Go To 5

5. EXCESSIVE WHEEL SPEED SENSOR AIR GAP
Measure the Wheel Speed Sensor Air Gap in accordance with the Service Information.

Were any problems found?
Yes >> Repair as necessary in accordance with the Service Information.
Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test
No >> Go To 6

6. WHEEL BEARING LOOSE/BINDING
Inspect the wheel bearings for excessive run out or improper clearance in accordance with the Service Information.

Were any problems found?
Yes >> Repair as necessary in accordance with the Service Information.
Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test
No >> Go To 7

7. RIGHT FRONT WHEEL SPEED SENSOR (+) CIRCUIT SHORTED TO GROUND





Turn the ignition off. Disconnect the Right Front Wheel Speed Sensor harness connector.
Disconnect the Controller Anti-lock Brake harness connector.

NOTE: Check connector - Clean/repair as necessary. Measure the resistance between the Right Front Wheel Speed Sensor (+) circuit and ground.

Is the resistance above 5.0 ohms?
Yes >> Go To 8
No >> Repair the Right Front Wheel Speed Sensor (+) circuit for a short to ground.
Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test

8. RIGHT FRONT WHEEL SPEED SENSOR (-) CIRCUIT SHORTED TO GROUND





Measure the resistance between the Right Front Wheel Speed Sensor (-) circuit and ground.

Is the resistance above 5.0 ohms?
Yes >> Go To 9
No >> Repair the Right Front Wheel Speed Sensor (-) circuit for a short to ground.
Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test

9. RIGHT FRONT WHEEL SPEED SENSOR (+) CIRCUIT OPEN





Measure the resistance of the Right Front Wheel Speed Sensor (+) circuit.

Is the resistance below 5.0 ohms?
Yes >> Go To 10
No >> Repair the open Right Front Wheel Speed Sensor (+) circuit.
Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test

10. RIGHT FRONT WHEEL SPEED SENSOR (-) CIRCUIT OPEN





Measure the resistance of the Right Front Wheel Speed Sensor (-) circuit.

Is the resistance below 5.0 ohms?
Yes >> Go To 11
No >> Repair the open Right Front Wheel Speed Sensor (-) circuit.
Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test

11. RIGHT FRONT WHEEL SPEED SENSOR (+) CIRCUIT SHORTED TO VOLTAGE





Turn the ignition on.
Measure the voltage of the Right Front Wheel Speed Sensor (+) circuit.

Is there any voltage present?
Yes >> Repair Right Front Wheel Speed Sensor (+) circuit for a short to voltage.
Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test
No >> Go To 12

12. RIGHT FRONT WHEEL SPEED SENSOR (-) CIRCUIT SHORTED TO VOLTAGE





Measure the voltage of the Right Front Wheel Speed Sensor (-) circuit.

Is there any voltage present?
Yes >> Repair the Right Front Wheel Speed Sensor (-) circuit for a short to voltage.
Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test
No >> Go To 13

13. RIGHT FRONT WHEEL SPEED SENSOR (+) CIRCUIT SHORTED TO THE RIGHT FRONT WHEEL SPEED SENSOR (-) CIRCUIT





Turn the ignition off. Measure the resistance between the Right Front Wheel Speed Sensor (+) circuit and the Right Front Wheel Speed Sensor (-) circuit at the Controller Anti-lock Brake harness connector.

Is the resistance below 5.0 ohms?
Yes >> Repair Right Front Wheel Speed Sensor (+) circuit for a short to the Right Front Wheel Speed Sensor (-) circuit.
Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test
No >> Go To 14

14. RIGHT FRONT WHEEL SPEED SENSOR
Turn the ignition off.
Connect the Right Front Wheel Speed Sensor harness connector.
Measure the resistance between the Right Front Wheel Speed Sensor (+) circuit and Right Front Wheel Speed Sensor (-) circuit at the Controller Anti-lock Brake harness connector.

NOTE: The resistance should be approximately 1800-2200 ohms at 76 degrees F.

Is the resistance within the noted range?
Yes >> Go to 15
No >> Replace the Right Front Wheel Speed Sensor in accordance with the Service Information.
Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test

15. CONTROLLER ANTI-LOCK BRAKE
Turn the ignition off.
Inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires.
Inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals.
Refer to any Technical Service Bulletins that may apply.

Were any problems found?
Yes >> Repair as necessary in accordance with the Service Information.
Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test
No >> Replace the Controller Anti-lock Brake in accordance with the Service Information.
Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test

16. WIRING HARNESS INSPECTION
Turn the ignition off.

NOTE: Towing the vehicle with ignition ON may set this DTC.

Inspect the related wiring harness. Look for any chafed, pierced, pinched, or partially broken wires.
Inspect the related wire harness connectors. Look for broken, bent, pushed out, or corroded terminals.
Refer to any Technical Service Bulletins that may apply.

Were any problems found?
Yes >> Repair as necessary in accordance with the Service Information.
Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test
No >> Test Complete.
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