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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) >> 37 - Intermittent Signal From Rear Sensor

37 - Intermittent Signal From Rear Sensor

INTERMITTENT SIGNAL FROM REAR SENSOR-37





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 wheels above 19 km/h (12 MPH) (brake released of ABS inactive) or 32 km/h (20 MPH) (brake applied or ABS active).

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

Possible Causes
- INTERMITTENT REAR WHEEL SPEED SENSOR DTC
- REAR WHEEL SPEED SENSOR (+) CIRCUIT SHORT TO GROUND
- REAR WHEEL SPEED SENSOR (-) CIRCUIT SHORT TO GROUND
- REAR WHEEL SPEED SENSOR (+) CIRCUIT OPEN
- REAR WHEEL SPEED SENSOR (-) CIRCUIT OPEN
- REAR WHEEL SPEED SENSOR (+) CIRCUIT SHORTED TO VOLTAGE
- REAR WHEEL SPEED SENSOR (-) CIRCUIT SHORTED TO VOLTAGE
- REAR WHEEL SPEED SENSOR (+) CIRCUIT SHORTED TO THE REAR WHEEL SPEED SENSOR (-) CIRCUIT
- TONE WHEEL
- EXCESSIVE REAR WHEEL SPEED SENSOR AIR GAP
- WHEEL BEARING/REAR DIFFERENTIAL
- REAR 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.
Perform ABS VERIFICATION TEST - VER 1. ABS Verification Test
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/REAR DIFFERENTIAL
Inspect the wheel bearings for excessive run out or improper clearance in accordance with the Service Information.
Inspect the rear differential for proper operating. Refer to 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. REAR WHEEL SPEED SENSOR (+) In CIRCUIT SHORTED TO GROUND





Turn the ignition off.
Disconnect the Rear 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 Rear Wheel Speed Sensor (+) circuit and ground.

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

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





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

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

9. REAR WHEEL SPEED SENSOR (+) CIRCUIT OPEN





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

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

10. REAR WHEEL SPEED SENSOR (-) CIRCUIT OPEN





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

Is the resistance below 5 ohms?
Yes >> Go To 11
No >> Repair the open Rear Wheel Speed Sensor (-) circuit.
Perform ABS VERIFICATION TEST - VER 1.

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




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

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

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





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

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

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





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

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

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

NOTE: The resistance should be approximately 1600 - 2300 ohms at 76 degrees F.

Is the resistance within the noted range?
Yes >> Go to 15
No >> Replace the Rear 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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